Mock emit_map_preview_ready

Updated the benchmark workflow to use actions/checkout@v5 and added steps to check for and upload a map preview artifact.

.envrc

@@ -0,0 +1 @@
+use flake

.gitattributes

@@ -1 +1 @@
-gui-src/** linguist-vendored
+src/gui/** linguist-vendored

.github/ISSUE_TEMPLATE/bug_report.md

@@ -11,13 +11,13 @@ assignees: ''
 A clear and concise description of what the bug is and what you expected to happen.
 
 **Used bbox area**
-Please provide your input parameters so we can reproduce the issue. *(For example: 48.133444 11.569462 48.142609 11.584740)*
+Please provide your input parameters (BBOX) so we can reproduce the issue. *(For example: 48.133444 11.569462 48.142609 11.584740)*
 
 **Arnis and Minecraft version**
-Please tell us what version of Arnis and Minecraft you used.
+Please tell us what version of Arnis and Minecraft you used, as well as if you are on Windows, Linux or MacOS.
 
 **Screenshots**
 If applicable, add screenshots to help explain your problem.
 
 **Additional context**
-Add any other context about the problem here. If you used any more custom settings, please provide them here too. If you experienced any issue with the application itself like a crash, please provide the log file which can be found at C:\Users\USERNAME\AppData\Local\com.louisdev.arnis\logs
+Add any other context about the problem here. If you used any more custom settings, please provide them here too. Please provide the log file if possible as well, which can be found at C:\Users\USERNAME\AppData\Local\com.louisdev.arnis\logs

.github/workflows/ci-build.yml

@@ -1,35 +1,32 @@
 name: CI Build
 
-# Trigger on pull request creation, update, and on pushes to the main branch
+# Trigger CI on pull requests when relevant files change, and pushes to main
 on:
   pull_request:
-    branches:
-      - main
+    paths:
+      - '.github/**'
+      - 'src/**'
+      - 'Cargo.toml'
+      - 'Cargo.lock'
   push:
     branches:
       - main
   workflow_dispatch:
 
 jobs:
-  build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
-
+  lint:
+    runs-on: ubuntu-latest
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
 
     - name: Set up Rust
       uses: dtolnay/rust-toolchain@v1
       with:
         toolchain: stable
-        targets: ${{ matrix.os == 'windows-latest' && 'x86_64-pc-windows-msvc' || 'x86_64-unknown-linux-gnu' || 'x86_64-apple-darwin' }}
-        components: clippy
+        components: clippy, rustfmt
 
     - name: Install Linux dependencies
-      if: matrix.os == 'ubuntu-latest'
       run: |
         sudo apt update
         sudo apt install -y software-properties-common
@@ -39,14 +36,39 @@ jobs:
         sudo apt install -y libgtk-3-dev build-essential pkg-config libglib2.0-dev libsoup-3.0-dev libwebkit2gtk-4.1-dev
         echo "PKG_CONFIG_PATH=/usr/lib/x86_64-linux-gnu/pkgconfig" >> $GITHUB_ENV
 
+    - uses: Swatinem/rust-cache@v2
+
     - name: Check formatting
       run: cargo fmt -- --check
 
     - name: Check clippy lints
       run: cargo clippy --all-targets --all-features -- -D warnings
 
-    - name: Install Rust dependencies
-      run: cargo fetch
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v6
 
-    - name: Build
-      run: cargo build --release
+    - name: Set up Rust
+      uses: dtolnay/rust-toolchain@v1
+      with:
+        toolchain: stable
+
+    - name: Install Linux dependencies
+      run: |
+        sudo apt update
+        sudo apt install -y software-properties-common
+        sudo add-apt-repository universe
+        echo "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc)-backports main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list
+        sudo apt update
+        sudo apt install -y libgtk-3-dev build-essential pkg-config libglib2.0-dev libsoup-3.0-dev libwebkit2gtk-4.1-dev
+        echo "PKG_CONFIG_PATH=/usr/lib/x86_64-linux-gnu/pkgconfig" >> $GITHUB_ENV
+
+    - uses: Swatinem/rust-cache@v2
+
+    - name: Build (all targets, all features)
+      run: cargo build --all-targets --all-features --release
+
+    - name: Run unit tests
+      run: cargo test --all-targets --all-features

.github/workflows/pr-benchmark.yml

@@ -0,0 +1,141 @@
+name: PR Benchmark
+
+permissions:
+  contents: read
+  pull-requests: write
+
+on:
+  pull_request:
+    types: [opened, reopened]
+  issue_comment:
+    types: [created]
+
+jobs:
+  benchmark:
+    if: |
+      github.event_name == 'pull_request' ||
+      (github.event_name == 'issue_comment' &&
+       github.event.issue.pull_request != null &&
+       contains(github.event.comment.body, 'retrigger-benchmark'))
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+
+      - uses: Swatinem/rust-cache@v2
+
+      - name: Create dummy Minecraft world directory
+        run: |
+          mkdir -p "./world/region"
+
+      - name: Build for release
+        run: cargo build --release --no-default-features
+
+      - name: Start timer
+        id: start_time
+        run: echo "start_time=$(date +%s)" >> $GITHUB_OUTPUT
+
+      - name: Run benchmark command with memory tracking
+        id: benchmark
+        run: |
+          /usr/bin/time -v ./target/release/arnis --path="./world" --terrain --generate-map --bbox="48.125768 11.552296 48.148565 11.593838" 2> benchmark_log.txt
+          grep "Maximum resident set size" benchmark_log.txt | awk '{print $6}' > peak_mem_kb.txt
+          peak_kb=$(cat peak_mem_kb.txt)
+          peak_mb=$((peak_kb / 1024))
+          echo "peak_memory=${peak_mb}" >> $GITHUB_OUTPUT
+
+      - name: End timer and calculate duration
+        id: end_time
+        run: |
+          end_time=$(date +%s)
+          start_time=${{ steps.start_time.outputs.start_time }}
+          duration=$((end_time - start_time))
+          echo "duration=$duration" >> $GITHUB_OUTPUT
+
+      - name: Check for map preview
+        id: map_check
+        run: |
+          if [ -f "./world/arnis_world_map.png" ]; then
+            echo "Map preview generated successfully"
+            echo "map_exists=true" >> $GITHUB_OUTPUT
+          else
+            echo "Map preview not found"
+            echo "map_exists=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Upload map preview as artifact
+        if: steps.map_check.outputs.map_exists == 'true'
+        uses: actions/upload-artifact@v4
+        with:
+          name: world-map-preview
+          path: ./world/arnis_world_map.png
+          retention-days: 60
+
+      - name: Format duration and generate summary
+        id: comment_body
+        run: |
+          duration=${{ steps.end_time.outputs.duration }}
+          minutes=$((duration / 60))
+          seconds=$((duration % 60))
+          peak_mem=${{ steps.benchmark.outputs.peak_memory }}
+
+          baseline_time=69
+          diff=$((duration - baseline_time))
+          abs_diff=${diff#-}
+
+          if [ "$diff" -lt -5 ]; then
+            verdict="✅ This PR **improves generation time**."
+          elif [ "$abs_diff" -le 4 ]; then
+            verdict="🟢 Generation time is unchanged."
+          elif [ "$diff" -le 15 ]; then
+            verdict="⚠️ This PR **worsens generation time**."
+          else
+            verdict="🚨 This PR **drastically worsens generation time**."
+          fi
+
+          baseline_mem=935
+          mem_annotation=""
+          if [ "$peak_mem" -gt 2000 ]; then
+            mem_diff=$((peak_mem - baseline_mem))
+            mem_percent=$((mem_diff * 100 / baseline_mem))
+            mem_annotation=" (↗ ${mem_percent}% more)"
+          fi
+
+          # Get current timestamp
+          benchmark_time=$(date -u "+%Y-%m-%d %H:%M:%S UTC")
+          run_url="https://github.com/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}"
+
+          {
+            echo "summary<<EOF"
+            echo "## ⏱️ Benchmark Results"
+            echo ""
+            echo "| Metric | Value |"
+            echo "|--------|-------|"
+            echo "| Duration | **${minutes}m ${seconds}s** |"
+            echo "| Peak Memory | **${peak_mem} MB**${mem_annotation} |"
+            echo "| Baseline | **${baseline_time}s** |"
+            echo "| Delta | **${diff}s** |"
+            echo "| Commit | [\`${GITHUB_SHA:0:7}\`](https://github.com/${GITHUB_REPOSITORY}/commit/${GITHUB_SHA}) |"
+            echo ""
+            echo "${verdict}"
+            echo ""
+            echo "---"
+            echo ""
+            echo "📅 **Last benchmark:** ${benchmark_time} | 📥 [Download generated world map](${run_url}#artifacts)"
+            echo ""
+            echo "_You can retrigger the benchmark by commenting \`retrigger-benchmark\`._"
+            echo "EOF"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: Comment build time on PR
+        uses: thollander/actions-comment-pull-request@v3
+        with:
+          message: ${{ steps.comment_body.outputs.summary }}
+          comment-tag: benchmark-report
+        env:
+          GITHUB_TOKEN: ${{ secrets.BENCHMARK_TOKEN }}

.github/workflows/release.yml

@@ -17,16 +17,20 @@ jobs:
             target: x86_64-unknown-linux-gnu
             binary_name: arnis
             asset_name: arnis-linux
-          - os: macos-latest
+          - os: macos-13  # Intel runner for x86_64 builds
             target: x86_64-apple-darwin
             binary_name: arnis
-            asset_name: arnis-mac
+            asset_name: arnis-mac-intel
+          - os: macos-latest  # ARM64 runner for ARM64 builds
+            target: aarch64-apple-darwin
+            binary_name: arnis
+            asset_name: arnis-mac-arm64
 
     runs-on: ${{ matrix.os }}
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
 
     - name: Set up Rust
       uses: dtolnay/rust-toolchain@v1
@@ -49,10 +53,10 @@ jobs:
       run: cargo fetch
 
     - name: Build
-      run: cargo build --release
+      run: cargo build --release --target ${{ matrix.target }}
 
     - name: Rename binary for release
-      run: mv target/release/${{ matrix.binary_name }} target/release/${{ matrix.asset_name }}
+      run: mv target/${{ matrix.target }}/release/${{ matrix.binary_name }} target/release/${{ matrix.asset_name }}
 
     - name: Install Windows SDK
       if: matrix.os == 'windows-latest'
@@ -83,47 +87,74 @@ jobs:
       shell: powershell
 
     - name: Upload artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
-        name: ${{ matrix.os }}-build
+        name: ${{ matrix.os }}-${{ matrix.target }}-build
         path: target/release/${{ matrix.asset_name }}
 
-  release:
+  create-universal-macos:
     needs: build
+    runs-on: macos-latest
+    steps:
+    - name: Download macOS Intel build
+      uses: actions/download-artifact@v5
+      with:
+        name: macos-13-x86_64-apple-darwin-build
+        path: ./intel
+
+    - name: Download macOS ARM64 build
+      uses: actions/download-artifact@v5
+      with:
+        name: macos-latest-aarch64-apple-darwin-build
+        path: ./arm64
+
+    - name: Create universal binary
+      run: |
+        lipo -create -output arnis-mac-universal ./intel/arnis-mac-intel ./arm64/arnis-mac-arm64
+        chmod +x arnis-mac-universal
+
+    - name: Upload universal binary
+      uses: actions/upload-artifact@v4
+      with:
+        name: macos-universal-build
+        path: arnis-mac-universal
+
+  release:
+    needs: [build, create-universal-macos]
     runs-on: ubuntu-latest
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
 
     - name: Download Windows build artifact
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v5
       with:
-        name: windows-latest-build
+        name: windows-latest-x86_64-pc-windows-msvc-build
         path: ./builds/windows
 
     - name: Download Linux build artifact
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v5
       with:
-        name: ubuntu-latest-build
+        name: ubuntu-latest-x86_64-unknown-linux-gnu-build
         path: ./builds/linux
 
-    - name: Download macOS build artifact
-      uses: actions/download-artifact@v3
+    - name: Download macOS universal build artifact
+      uses: actions/download-artifact@v5
       with:
-        name: macos-latest-build
+        name: macos-universal-build
         path: ./builds/macos
 
     - name: Make Linux and macOS binaries executable
       run: |
         chmod +x ./builds/linux/arnis-linux
-        chmod +x ./builds/macos/arnis-mac
+        chmod +x ./builds/macos/arnis-mac-universal
 
     - name: Create GitHub Release
-      uses: softprops/action-gh-release@v1
+      uses: softprops/action-gh-release@v2
       with:
         files: |
           builds/windows/arnis-windows.exe
           builds/linux/arnis-linux
-          builds/macos/arnis-mac
+          builds/macos/arnis-mac-universal
       env:
         GITHUB_TOKEN: ${{ secrets.RELEASE_TOKEN }}

.github/workflows/test-macos-build.yml.disabled

@@ -0,0 +1,100 @@
+name: Test macOS Build
+
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - '.github/workflows/release.yml'
+      - 'src/**'
+      - 'Cargo.toml'
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:  # Allow manual triggering
+
+jobs:
+  test-macos-builds:
+    strategy:
+      matrix:
+        include:
+          - target: x86_64-apple-darwin
+            asset_name: arnis-mac-intel
+          - target: aarch64-apple-darwin
+            asset_name: arnis-mac-arm64
+
+    runs-on: macos-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Rust
+      uses: dtolnay/rust-toolchain@v1
+      with:
+        toolchain: stable
+        targets: ${{ matrix.target }}
+
+    - name: Install dependencies
+      run: cargo fetch
+
+    - name: Build for ${{ matrix.target }}
+      run: cargo build --release --target ${{ matrix.target }}
+
+    - name: Rename binary
+      run: mv target/${{ matrix.target }}/release/arnis target/${{ matrix.target }}/release/${{ matrix.asset_name }}
+
+    - name: Check binary architecture
+      run: |
+        file target/${{ matrix.target }}/release/${{ matrix.asset_name }}
+        lipo -info target/${{ matrix.target }}/release/${{ matrix.asset_name }}
+
+    - name: Test binary execution (basic check)
+      run: |
+        chmod +x target/${{ matrix.target }}/release/${{ matrix.asset_name }}
+        # Test that it at least shows help/version (don't run full generation)
+        target/${{ matrix.target }}/release/${{ matrix.asset_name }} --help || echo "Help command completed"
+
+    - name: Upload test artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: test-${{ matrix.target }}-build
+        path: target/${{ matrix.target }}/release/${{ matrix.asset_name }}
+
+  test-universal-binary:
+    needs: test-macos-builds
+    runs-on: macos-latest
+    steps:
+    - name: Download Intel build
+      uses: actions/download-artifact@v4
+      with:
+        name: test-x86_64-apple-darwin-build
+        path: ./intel
+
+    - name: Download ARM64 build  
+      uses: actions/download-artifact@v4
+      with:
+        name: test-aarch64-apple-darwin-build
+        path: ./arm64
+
+    - name: Create and test universal binary
+      run: |
+        lipo -create -output arnis-mac-universal ./intel/arnis-mac-intel ./arm64/arnis-mac-arm64
+        chmod +x arnis-mac-universal
+        
+        # Verify it's actually universal
+        echo "=== Universal Binary Info ==="
+        file arnis-mac-universal
+        lipo -info arnis-mac-universal
+        
+        # Test execution
+        echo "=== Testing Universal Binary ==="
+        ./arnis-mac-universal --help || echo "Universal binary help command completed"
+        
+        # Check file size (should be sum of both architectures roughly)
+        echo "=== File Sizes ==="
+        ls -lah ./intel/arnis-mac-intel ./arm64/arnis-mac-arm64 arnis-mac-universal
+
+    - name: Upload universal binary
+      uses: actions/upload-artifact@v4
+      with:
+        name: test-universal-build
+        path: arnis-mac-universal

.gitignore

@@ -1,6 +1,7 @@
+/wiki
+
 # Environment files
 .env
-.envrc
 /.direnv
 
 # Build artifacts
@@ -28,6 +29,8 @@ Thumbs.db
 /export.json
 /parsed_osm_data.txt
 /elevation_debug.png
+/terrain-tile-cache
+/arnis-tile-cache
 /gen/
 /build/
 *.rmeta

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "arnis"
-version = "2.2.0"
+version = "2.3.1"
 edition = "2021"
 description = "Arnis - Generate real life cities in Minecraft"
 homepage = "https://github.com/louis-e/arnis"
@@ -10,40 +10,45 @@ readme = "README.md"
 
 [profile.release]
 lto = "thin"
+overflow-checks = true
 
 [features]
 default = ["gui"]
-gui = ["dep:tauri", "dep:tauri-plugin-log", "dep:tauri-plugin-shell"]
+gui = ["tauri", "tauri-plugin-log", "tauri-plugin-shell", "tokio", "rfd", "dirs", "tauri-build"]
 
 [build-dependencies]
-tauri-build = "2"
+tauri-build = {version = "2", optional = true}
 
 [dependencies]
-clap = { version = "4.1", features = ["derive"] }
-colored = "2.1.0"
-dirs = "5.0.1"
-fastanvil = "0.31.0"
-fastnbt = "2.5.0"
-flate2 = "1.0"
+base64 = "0.22.1"
+clap = { version = "4.5", features = ["derive", "env"] }
+colored = "3.0.0"
+dirs = {version = "6.0.0", optional = true }
+fastanvil = "0.32.0"
+fastnbt = "2.6.0"
+flate2 = "1.1"
 fnv = "1.0.7"
 fs2 = "0.4"
-geo = "0.29.3"
-image = "0.24"
-indicatif = "0.17.8"
+geo = "0.31.0"
+image = "0.25"
+indicatif = "0.17.11"
 itertools = "0.14.0"
-log = "0.4.22"
-once_cell = "1.19.0"
+log = "0.4.27"
+once_cell = "1.21.3"
 rand = "0.8.5"
 rayon = "1.10.0"
-reqwest = { version = "0.12.7", features = ["blocking", "json"] }
-rfd = "0.15.1"
-semver = "1.0.23"
+reqwest = { version = "0.12.15", features = ["blocking", "json"] }
+rfd = { version = "0.15.4", optional = true }
+semver = "1.0.27"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 tauri = { version = "2", optional = true }
-tauri-plugin-log = { version = "2.2.0", optional = true }
+tauri-plugin-log = { version = "2.6.0", optional = true }
 tauri-plugin-shell = { version = "2", optional = true }
-tokio = { version = "1.42.0", features = ["full"] }
+tokio = { version = "1.48.0", features = ["full"], optional = true }
 
 [target.'cfg(windows)'.dependencies]
-windows = { version = "0.59.0", features = ["Win32_System_Console"] }
+windows = { version = "0.61.1", features = ["Win32_System_Console"] }
+
+[dev-dependencies]
+tempfile = "3.23.0"

README.md

@@ -1,110 +1,41 @@
-<p align="center">
-  <img width="456" height="125" src="https://github.com/louis-e/arnis/blob/main/gui-src/images/logo.png?raw=true">
-</p>
+<img src="assets/git/banner.png" width="100%" alt="Banner">
 
-# Arnis [![CI Build Status](https://github.com/louis-e/arnis/actions/workflows/ci-build.yml/badge.svg)](https://github.com/louis-e/arnis/actions) [<img alt="GitHub Release" src="https://img.shields.io/github/v/release/louis-e/arnis" />](https://github.com/louis-e/arnis/releases) [<img alt="GitHub Downloads (all assets, all releases" src="https://img.shields.io/github/downloads/louis-e/arnis/total" />](https://github.com/louis-e/arnis/releases)
+# Arnis [![CI Build Status](https://github.com/louis-e/arnis/actions/workflows/ci-build.yml/badge.svg)](https://github.com/louis-e/arnis/actions) [<img alt="GitHub Release" src="https://img.shields.io/github/v/release/louis-e/arnis" />](https://github.com/louis-e/arnis/releases) [<img alt="GitHub Downloads (all assets, all releases" src="https://img.shields.io/github/downloads/louis-e/arnis/total" />](https://github.com/louis-e/arnis/releases) [![Download here](https://img.shields.io/badge/Download-here-green)](https://github.com/louis-e/arnis/releases) [![Discord](https://img.shields.io/discord/1326192999738249267?label=Discord&color=%237289da)](https://discord.gg/mA2g69Fhxq)
 
-This open source project written in Rust generates any chosen location from the real world in Minecraft Java Edition with a high level of detail.
+Arnis creates complex and accurate Minecraft Java Edition worlds that reflect real-world geography, topography, and architecture.
 
-###### ⚠️ This Github page is the official project website. Do not download Arnis from any other website.
+This free and open source project is designed to handle large-scale geographic data from the real world and generate detailed Minecraft worlds. The algorithm processes geospatial data from OpenStreetMap as well as elevation data to create an accurate Minecraft representation of terrain and architecture.
+Generate your hometown, big cities, and natural landscapes with ease!
 
-## :desktop_computer: Example
-![Minecraft Preview](https://github.com/louis-e/arnis/blob/main/gitassets/mc.gif?raw=true)
-
-By leveraging geospatial data from OpenStreetMap and utilizing the powerful capabilities of Rust, Arnis provides an efficient and robust solution for creating complex and accurate Minecraft worlds that reflect real-world geography and architecture.
-
-Arnis is designed to handle large-scale data and generate rich, immersive environments that bring real-world cities, landmarks, and natural features into the Minecraft universe. Whether you're looking to replicate your hometown, explore urban environments, or simply build something unique and realistic, Arnis generates your vision.
+![Minecraft Preview](assets/git/preview.jpg)
+<i>This Github page and [arnismc.com](https://arnismc.com) are the only official project websites. Do not download Arnis from any other website.</i>
 
 ## :keyboard: Usage
-<img width="60%" src="https://github.com/louis-e/arnis/blob/main/gitassets/gui.png?raw=true"><br>
+<img width="60%" src="assets/git/gui.png"><br>
 Download the [latest release](https://github.com/louis-e/arnis/releases/) or [compile](#trophy-open-source) the project on your own.
- 
-Choose your area in Arnis using the rectangle tool and select your Minecraft world - then simply click on 'Start Generation'!
-The world will always be generated starting from the Minecraft coordinates 0 0 0 (/tp 0 0 0). This is the top left of your selected area.
 
-To generate your world with terrain, make sure to enable the corresponding feature in the generation settings.
+Choose your area on the map using the rectangle tool and select your Minecraft world - then simply click on <i>Start Generation</i>!
+Additionally, you can customize various generation settings, such as world scale, spawn point, or building interior generation.
 
-Minecraft version 1.16.5 and below is currently not supported, but we are working on it! For the best results, use Minecraft version 1.21.4.
-If you choose to select an own world, be aware that Arnis will overwrite certain areas.
+## 📚 Documentation
 
-## :floppy_disk: How it works
-![CLI Generation](https://github.com/louis-e/arnis/blob/main/gitassets/cli.gif?raw=true)
+<img src="assets/git/documentation.png" width="100%" alt="Banner">
 
-The raw data obtained from the API *[(see FAQ)](#question-faq)* includes each element (buildings, walls, fountains, farmlands, etc.) with its respective corner coordinates (nodes) and descriptive tags. When you run Arnis, the following steps are performed automatically to generate a Minecraft world:
-
-#### Processing Pipeline
-1. **Fetching Data from the Overpass API:** The script retrieves geospatial data for the desired bounding box from the Overpass API.
-2. **Parsing Raw Data:** The raw data is parsed to extract essential information like nodes, ways, and relations. Nodes are converted into Minecraft coordinates, and relations are handled similarly to ways, ensuring all relevant elements are processed correctly. Relations and ways cluster several nodes into one specific object.
-3. **Prioritizing and Sorting Elements:** The elements (nodes, ways, relations) are sorted by priority to establish a layering system, which ensures that certain types of elements (e.g., entrances and buildings) are generated in the correct order to avoid conflicts and overlapping structures.
-4. **Generating Minecraft World:** The Minecraft world is generated using a series of element processors (generate_buildings, generate_highways, generate_landuse, etc.) that interpret the tags and nodes of each element to place the appropriate blocks in the Minecraft world. These processors handle the logic for creating 3D structures, roads, natural formations, and more, as specified by the processed data.
-5. **Generating Ground Layer:** A ground layer is generated based on the provided scale factors to provide a base for the entire Minecraft world. This step ensures all areas have an appropriate foundation (e.g., grass and dirt layers).
-6. **Saving the Minecraft World:** All the modified chunks are saved back to the Minecraft region files.
-
-## :question: FAQ
-- *Wasn't this written in Python before?*<br>
-Yes! Arnis was initially developed in Python, which benefited from Python's open-source friendliness and ease of readability. This is why we strive for clear, well-documented code in the Rust port of this project to find the right balance. I decided to port the project to Rust to learn more about the language and push the algorithm's performance further. We were nearing the limits of optimization in Python, and Rust's capabilities allow for even better performance and efficiency. The old Python implementation is still available in the python-legacy branch.
-- *Where does the data come from?*<br>
-The geographic data is sourced from OpenStreetMap (OSM)[^1], a free, collaborative mapping project that serves as an open-source alternative to commercial mapping services. The data is accessed via the Overpass API, which queries OSM's database. Other services like Google Maps do not provide data like this, which makes OSM perfect for this project.
-- *How does the Minecraft world generation work?*<br>
-The script uses the [fastnbt](https://github.com/owengage/fastnbt) cargo package to interact with Minecraft's world format. This library allows Arnis to manipulate Minecraft region files, enabling the generation of real-world locations. The section 'Processing Pipeline' goes a bit further into the details and steps of the generation process itself.
-- *Where does the name come from?*<br>
-The project is named after the smallest city in Germany, Arnis[^2]. The city's small size made it an ideal test case for developing and debugging the algorithm efficiently.
-- *I don't have Minecraft installed but want to generate a world for my kids. How?*<br>
-When selecting a world, click on 'Select existing world' and choose a directory. The world will be generated there.
-- *Arnis instantly closes again or the window is empty!*<br>
-If you're on Windows, please install the [Evergreen Bootstrapper from Microsoft](https://developer.microsoft.com/en-us/microsoft-edge/webview2/?form=MA13LH#download).
-- *What Minecraft version should I use?*<br>
-Please use Minecraft version 1.21.4 for the best results. Minecraft version 1.16.5 and below is currently not supported, but we are working on it!
-- *The generation did finish, but there's nothing in the world!*<br>
-Make sure to teleport to the generation starting point (/tp 0 0 0). If there is still nothing, you might need to travel a bit further into the positive X and positive Z direction.
-- *What features are in the world generation settings?*<br>
-**Terrain:** Make sure to enable this feature to generate your world with elevation data included.<br>
-**Winter Mode:** This setting changes the generation style to a snowy theme and adds snow layers to the ground.<br>
-**Scale Factor:** The scale factor determines the size of the generated world.<br>
-**Custom BBOX Input:** This setting allows you to manually input the bounding box coordinates for the area you want to generate.<br>
-**Floodfill-Timeout (Sec):** This setting determines the maximum time the floodfill algorithm is allowed to run before being terminated. Increasing this value may improve the generation of large water areas but may also increase processing time.<br>
-**Ground Height:** This setting determines the base height of the generated world and can be adjusted to create different terrain types.
-
-## :memo: ToDo and Known Bugs
-Feel free to choose an item from the To-Do or Known Bugs list, or bring your own idea to the table. Bug reports shall be raised as a Github issue. Contributions are highly welcome and appreciated!
-- [ ] Fix compilation for Linux
-- [ ] Rotate maps (https://github.com/louis-e/arnis/issues/97)
-- [ ] Fix coastal cities generation duration time (water_areas.rs)
-- [ ] Add street names as signs
-- [ ] Add support for older Minecraft versions (<=1.16.5) (https://github.com/louis-e/arnis/issues/124, https://github.com/louis-e/arnis/issues/137)
-- [ ] Mapping real coordinates to Minecraft coordinates (https://github.com/louis-e/arnis/issues/29)
-- [ ] Add interior to buildings
-- [ ] Implement house roof types
-- [ ] Add support for inner attribute in multipolygons and multipolygon elements other than buildings
-- [ ] Refactor bridges implementation
-- [ ] Better code documentation
-- [ ] Refactor fountain structure implementation
-- [ ] Luanti Support (https://github.com/louis-e/arnis/issues/120)
-- [ ] Minecraft Bedrock Edition Support (https://github.com/louis-e/arnis/issues/148)
-- [x] Evaluate and implement elevation (https://github.com/louis-e/arnis/issues/66)
-- [x] Refactor railway implementation
-- [x] Evaluate and implement faster region saving
-- [x] Support multipolygons (https://github.com/louis-e/arnis/issues/112, https://github.com/louis-e/arnis/issues/114)
-- [x] Memory optimization
-- [x] Fix Github Action Workflow for releasing MacOS Binary
-- [x] Design and implement a GUI
-- [x] Automatic new world creation instead of using an existing world
-- [x] Fix faulty empty chunks ([https://github.com/owengage/fastnbt/issues/120](https://github.com/owengage/fastnbt/issues/120)) (workaround found)
-- [x] Setup fork of [https://github.com/aaronr/bboxfinder.com](https://github.com/aaronr/bboxfinder.com) for easy bbox picking
+Full documentation is available in the [GitHub Wiki](https://github.com/louis-e/arnis/wiki/), covering topics such as technical explanations, FAQs, contribution guidelines and roadmaps.
 
 ## :trophy: Open Source
 #### Key objectives of this project
 - **Modularity**: Ensure that all components (e.g., data fetching, processing, and world generation) are cleanly separated into distinct modules for better maintainability and scalability.
-- **Performance Optimization**: Utilize Rust’s memory safety and concurrency features to optimize the performance of the world generation process.
+- **Performance Optimization**: We aim to keep a good performance and speed of the world generation process.
 - **Comprehensive Documentation**: Detailed in-code documentation for a clear structure and logic.
 - **User-Friendly Experience**: Focus on making the project easy to use for end users.
-- **Cross-Platform Support**: Ensure the project runs smoothly on Windows, macOS, and Linux.
+- **Cross-Platform Support**: We want this project to run smoothly on Windows, macOS, and Linux.
 
 #### How to contribute
-This project is open source and welcomes contributions from everyone! Whether you're interested in fixing bugs, improving performance, adding new features, or enhancing documentation, your input is valuable. Simply fork the repository, make your changes, and submit a pull request. We encourage discussions and suggestions to ensure the project remains modular, optimized, and easy to use for the community. You can use the parameter --debug to get a more detailed output of the processed values, which can be helpful for debugging and development. Contributions of all levels are appreciated, and your efforts help improve this tool for everyone.
+This project is open source and welcomes contributions from everyone! Whether you're interested in fixing bugs, improving performance, adding new features, or enhancing documentation, your input is valuable. Simply fork the repository, make your changes, and submit a pull request. Please respect the above mentioned key objectives. Contributions of all levels are appreciated, and your efforts help improve this tool for everyone.
 
-Build and run it using: ```cargo run --release --no-default-features -- --path="C:/YOUR_PATH/.minecraft/saves/worldname" --bbox="min_lng,min_lat,max_lng,max_lat"```<br>
-For the GUI: ```cargo run --release```<br>
+Command line Build: ```cargo run --no-default-features -- --terrain --path="C:/YOUR_PATH/.minecraft/saves/worldname" --bbox="min_lat,min_lng,max_lat,max_lng"```<br>
+GUI Build: ```cargo run```<br>
 
 After your pull request was merged, I will take care of regularly creating update releases which will include your changes.
 
@@ -118,6 +49,20 @@ After your pull request was merged, I will take care of regularly creating updat
  </picture>
 </a>
 
+## :newspaper: Academic & Press Recognition
+
+<img src="assets/git/recognition.png" width="100%" alt="Banner">
+
+Arnis has been recognized in various academic and press publications after gaining a lot of attention in December 2024.
+
+[Floodcraft: Game-based Interactive Learning Environment using Minecraft for Flood Mitigation and Preparedness for K-12 Education](https://www.researchgate.net/publication/384644535_Floodcraft_Game-based_Interactive_Learning_Environment_using_Minecraft_for_Flood_Mitigation_and_Preparedness_for_K-12_Education)
+
+[Hackaday: Bringing OpenStreetMap Data into Minecraft](https://hackaday.com/2024/12/30/bringing-openstreetmap-data-into-minecraft/)
+
+[TomsHardware: Minecraft Tool Lets You Create Scale Replicas of Real-World Locations](https://www.tomshardware.com/video-games/pc-gaming/minecraft-tool-lets-you-create-scale-replicas-of-real-world-locations-arnis-uses-geospatial-data-from-openstreetmap-to-generate-minecraft-maps)
+
+[XDA Developers: Hometown Minecraft Map: Arnis](https://www.xda-developers.com/hometown-minecraft-map-arnis/)
+
 ## :copyright: License Information
 Copyright (c) 2022-2025 Louis Erbkamm (louis-e)
 
@@ -133,7 +78,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.[^3]
 
-Download Arnis only from the official source (https://github.com/louis-e/arnis/). Every other website providing a download and claiming to be affiliated with the project is unofficial and may be malicious.
+Download Arnis only from the official source https://arnismc.com or https://github.com/louis-e/arnis/. Every other website providing a download and claiming to be affiliated with the project is unofficial and may be malicious.
 
 The logo was made by @nxfx21.
 

flake.lock

@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1755615617,
+        "narHash": "sha256-HMwfAJBdrr8wXAkbGhtcby1zGFvs+StOp19xNsbqdOg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "20075955deac2583bb12f07151c2df830ef346b4",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,36 @@
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+  };
+
+  outputs =
+    {
+      flake-utils,
+      nixpkgs,
+      ...
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        stdenv = if pkgs.stdenv.isLinux then pkgs.stdenvAdapters.useMoldLinker pkgs.stdenv else pkgs.stdenv;
+      in
+      {
+        devShell = pkgs.mkShell.override { inherit stdenv; } {
+          buildInputs = with pkgs; [
+            openssl.dev
+            pkg-config
+            wayland
+            glib
+            gdk-pixbuf
+            pango
+            gtk3
+            libsoup_3.dev
+            webkitgtk_4_1.dev
+          ];
+        };
+      }
+    );
+}

flake/flake.lock

@@ -1,99 +0,0 @@
-{
-  "nodes": {
-    "fenix": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "rust-analyzer-src": "rust-analyzer-src"
-      },
-      "locked": {
-        "lastModified": 1724653830,
-        "narHash": "sha256-88f0KK8h6tGIP4Na5RJDKs0S+7WsGGaCGNkLj/bPV3g=",
-        "owner": "nix-community",
-        "repo": "fenix",
-        "rev": "9ecf5e7d800ace001320da8acadd4a3deb872a83",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "fenix",
-        "type": "github"
-      }
-    },
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1724479785,
-        "narHash": "sha256-pP3Azj5d6M5nmG68Fu4JqZmdGt4S4vqI5f8te+E/FTw=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "d0e1602ddde669d5beb01aec49d71a51937ed7be",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "ref": "nixos-unstable",
-        "type": "indirect"
-      }
-    },
-    "root": {
-      "inputs": {
-        "fenix": "fenix",
-        "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
-      }
-    },
-    "rust-analyzer-src": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1724586512,
-        "narHash": "sha256-mrfwk6nO8N2WtCq3sB2zhd2QN1HMKzeSESzOA6lSsQg=",
-        "owner": "rust-lang",
-        "repo": "rust-analyzer",
-        "rev": "7106cd3be50b2a43c1d9f2787bf22d4369c2b25b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "rust-lang",
-        "ref": "nightly",
-        "repo": "rust-analyzer",
-        "type": "github"
-      }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}

flake/flake.nix

@@ -1,34 +0,0 @@
-{
-  inputs = {
-    fenix = {
-      url = "github:nix-community/fenix";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-    flake-utils.url = "github:numtide/flake-utils";
-    nixpkgs.url = "nixpkgs/nixos-unstable";
-  };
-
-  outputs = { self, fenix, flake-utils, nixpkgs }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let
-        pkgs = nixpkgs.legacyPackages.${system};
-        fenixPkgs = (fenix.packages.${system}.stable);
-      in
-      {
-        devShell = pkgs.mkShell
-          {
-            buildInputs = with pkgs; [
-              openssl.dev
-              pkg-config
-              fenixPkgs.toolchain
-              wayland
-              glib
-              gdk-pixbuf
-              pango
-              gtk3
-              libsoup_3.dev
-              webkitgtk_4_1.dev
-            ];
-          };
-      });
-}

gui-src/css/maps/leaflet.draw.ie.css

@@ -1,49 +0,0 @@
-/* Conditional stylesheet for IE. */
-
-.leaflet-draw-toolbar {
-	border: 3px solid #999;
-}
-
-.leaflet-draw-toolbar a {
-	background-color: #eee;
-}
-
-.leaflet-draw-toolbar a:hover {
-	background-color: #fff;
-}
-
-.leaflet-draw-actions {
-	left: 32px;
-	margin-top: 3px;
-}
-
-.leaflet-draw-actions li {
-	display: inline;
-	zoom: 1;
-}
-
-.leaflet-edit-marker-selected {
-	border: 4px dashed #fe93c2;
-}
-
-.leaflet-draw-actions a {
-	background-color: #999;
-}
-
-.leaflet-draw-actions a:hover {
-	background-color: #a5a5a5;
-}
-
-.leaflet-draw-actions-top a {
-	margin-top: 1px;
-}
-
-.leaflet-draw-actions-bottom a {
-	height: 28px;
-	line-height: 28px;
-}
-
-.leaflet-draw-actions-top.leaflet-draw-actions-bottom a {
-	height: 27px;
-	line-height: 27px;
-}

gui-src/css/maps/leaflet.ie.css

@@ -1,51 +0,0 @@
-.leaflet-vml-shape {
-	width: 1px;
-	height: 1px;
-	}
-.lvml {
-	behavior: url(#default#VML);
-	display: inline-block;
-	position: absolute;
-	}
-
-.leaflet-control {
-	display: inline;
-	}
-
-.leaflet-popup-tip {
-	width: 21px;
-	_width: 27px;
-	margin: 0 auto;
-	_margin-top: -3px;
-
-	filter: progid:DXImageTransform.Microsoft.Matrix(M11=0.70710678, M12=0.70710678, M21=-0.70710678, M22=0.70710678);
-	-ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=0.70710678, M12=0.70710678, M21=-0.70710678, M22=0.70710678)";
-	}
-.leaflet-popup-tip-container {
-	margin-top: -1px;
-	}
-.leaflet-popup-content-wrapper, .leaflet-popup-tip {
-	border: 1px solid #999;
-	}
-.leaflet-popup-content-wrapper {
-	zoom: 1;
-	}
-
-.leaflet-control-zoom,
-.leaflet-control-layers {
-	border: 3px solid #999;
-	}
-.leaflet-control-layers-toggle {
-	}
-.leaflet-control-attribution,
-.leaflet-control-layers,
-.leaflet-control-scale-line {
-	background: white;
-	}
-.leaflet-zoom-box {
-	filter: alpha(opacity=50);
-	}
-.leaflet-control-attribution {
-	border-top: 1px solid #bbb;
-	border-left: 1px solid #bbb;
-	}

gui-src/css/maps/mapbox.standalone.css

@@ -1,757 +0,0 @@
-/* general typography */
-.leaflet-container {
-  background:#fff;
-  font:15px/25px 'Helvetica Neue', Arial, Helvetica, sans-serif;
-  color:#404040;
-  color:rgba(0,0,0,0.75);
-  outline:0;
-  overflow:hidden;
-  -ms-touch-action:none;
-  }
-.leaflet-container *,
-.leaflet-container *:after,
-.leaflet-container *:before {
-  -webkit-box-sizing:border-box;
-     -moz-box-sizing:border-box;
-          box-sizing:border-box;
-  }
-
-.leaflet-container h1,
-.leaflet-container h2,
-.leaflet-container h3,
-.leaflet-container h4,
-.leaflet-container h5,
-.leaflet-container h6,
-.leaflet-container p {
-  font-size:15px;
-  line-height:25px;
-  margin:0 0 10px;
-  }
-.mapbox-small,
-.leaflet-control-attribution,
-.leaflet-control-scale,
-.leaflet-container input,
-.leaflet-container textarea,
-.leaflet-container label,
-.leaflet-container small {
-  font-size:12px;
-  line-height:20px;
-  }
-
-.leaflet-container a            {
-  color:#3887BE;
-  font-weight:normal;
-  text-decoration:none;
-  }
-.leaflet-container a:hover      { color:#63b6e5; }
-.leaflet-container.dark a       { color:#63b6e5; }
-.leaflet-container.dark a:hover { color:#8fcaec; }
-
-.leaflet-container.dark .mapbox-button,
-.leaflet-container .mapbox-button {
-  background-color:#3887be;
-  display:inline-block;
-  height:40px;
-  line-height:40px;
-  text-decoration:none;
-  color:#fff;
-  font-size:12px;
-  white-space:nowrap;
-  text-overflow:ellipsis;
-  }
-  .leaflet-container.dark .mapbox-button:hover,
-  .leaflet-container .mapbox-button:hover {
-    color:#fff;
-    background-color:#3bb2d0;
-    }
-
-/* Base Leaflet
-------------------------------------------------------- */
-.leaflet-map-pane,
-.leaflet-tile,
-.leaflet-marker-icon,
-.leaflet-marker-shadow,
-.leaflet-tile-pane,
-.leaflet-tile-container,
-.leaflet-overlay-pane,
-.leaflet-shadow-pane,
-.leaflet-marker-pane,
-.leaflet-popup-pane,
-.leaflet-overlay-pane svg,
-.leaflet-zoom-box,
-.leaflet-image-layer,
-.leaflet-layer {
-  position:absolute;
-  left:0;
-  top:0;
-  }
-
-.leaflet-tile,
-.leaflet-marker-icon,
-.leaflet-marker-shadow {
-  -webkit-user-drag:none;
-  -webkit-user-select:none;
-     -moz-user-select:none;
-          user-select:none;
-  }
-.leaflet-marker-icon,
-.leaflet-marker-shadow {
-  display: block;
-  }
-
-.leaflet-tile {
-  filter:inherit;
-  visibility:hidden;
-  }
-.leaflet-tile-loaded {
-  visibility:inherit;
-  }
-.leaflet-zoom-box {
-  width:0;
-  height:0;
-  }
-
-.leaflet-tile-pane    { z-index:2; }
-.leaflet-objects-pane { z-index:3; }
-.leaflet-overlay-pane { z-index:4; }
-.leaflet-shadow-pane  { z-index:5; }
-.leaflet-marker-pane  { z-index:6; }
-.leaflet-popup-pane   { z-index:7; }
-
-.leaflet-control {
-  position:relative;
-  z-index:7;
-  pointer-events:auto;
-  float:left;
-  clear:both;
-  }
-  .leaflet-right .leaflet-control   { float:right; }
-  .leaflet-top .leaflet-control     { margin-top:10px; }
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-/* Smaller Screens
-------------------------------------------------------- */
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-/* Browser Fixes
-------------------------------------------------------- */
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-/* Stupid Android 2 doesn't understand "max-width: none" properly */
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-/* Android chrome makes tiles disappear without this */
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-.map-tooltip { width:280px\8; /* < IE9 */ }

gui-src/index.html

@@ -1,151 +0,0 @@
-<!doctype html>
-<html lang="en">
-
-<head>
-  <meta charset="UTF-8" />
-  <link rel="stylesheet" href="./css/styles.css" />
-  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Arnis</title>
-  <script type="module" src="./js/main.js" defer></script>
-  <script type="module" src="./js/license.js" defer></script>
-</head>
-
-<body>
-  <main class="container">
-    <div class="row">
-      <a href="https://github.com/louis-e/arnis" target="_blank">
-        <img src="./images/logo.png" id="arnis-logo" class="logo arnis" alt="Arnis Logo" style="width: 35%; height: auto;" />
-      </a>
-    </div>
-
-    <div class="flex-container">
-      <!-- Left Box: Map and BBox Input -->
-      <section class="section map-box" style="margin-bottom: 0; padding-bottom: 0;">
-        <h2 data-localize="select_location">Select Location</h2>
-        <span id="bbox-text" style="font-size: 1.0em; display: block; margin-top: -8px; margin-bottom: 3px;" data-localize="zoom_in_and_choose">
-          Zoom in and choose your area using the rectangle tool
-        </span>
-        <iframe src="maps.html" width="100%" height="300" class="map-container" title="Map Picker"></iframe>
-
-        <span id="bbox-info"
-          style="font-size: 0.75em; color: #7bd864; display: block; margin-bottom: 4px; font-weight: bold; min-height: 2em;"></span>
-      </section>
-
-      <!-- Right Box: Directory Selection, Start Button, and Progress Bar -->
-      <section class="section controls-box">
-        <div class="controls-content">
-          <h2 data-localize="select_world">Select World</h2>
-
-          <!-- Updated Tooltip Structure -->
-          <div class="tooltip" style="width: 100%;">
-            <button type="button" onclick="openWorldPicker()" style="padding: 10px; line-height: 1.2; width: 100%;">
-              <span id="choose_world">Choose World</span>
-              <br>
-              <span id="selected-world" style="font-size: 0.8em; color: #fecc44; display: block; margin-top: 4px;" data-localize="no_world_selected">
-                No world selected
-              </span>
-            </button>
-          </div>
-          
-          <div class="button-container">
-            <button type="button" id="start-button" class="start-button" onclick="startGeneration()" data-localize="start_generation">Start Generation</button>
-            <button type="button" class="settings-button" onclick="openSettings()">
-                <i class="gear-icon"></i>
-            </button>
-          </div>
-          <br><br>
-
-          <div class="progress-section">
-            <h2 data-localize="progress">Progress</h2>
-            <div class="progress-bar-container">
-              <div class="progress-bar" id="progress-bar"></div>
-            </div>
-            <div class="progress-status">
-              <span id="progress-message"></span>
-              <span id="progress-detail">0%</span>
-            </div>
-          </div>
-        </div>
-      </section>
-    </div>
-
-    <!-- World Picker Modal -->
-    <div id="world-modal" class="modal" style="display: none;">
-      <div class="modal-content">
-        <span class="close-button" onclick="closeWorldPicker()">&times;</span>
-        <h2 data-localize="choose_world_modal_title">Choose World</h2>
-
-        <button type="button" id="select-world-button" class="select-world-button" onclick="selectWorld(false)" data-localize="select_existing_world">Select existing world</button>
-        <button type="button" id="generate-world-button" class="generate-world-button" onclick="selectWorld(true)" data-localize="generate_new_world">Generate new world</button>
-      </div>
-    </div>
-
-    <!-- Settings Modal -->
-    <div id="settings-modal" class="modal" style="display: none;">
-      <div class="modal-content">
-        <span class="close-button" onclick="closeSettings()">&times;</span>
-        <h2 data-localize="customization_settings">Customization Settings</h2>
-
-        <!-- Terrain Toggle Button -->
-        <div class="terrain-toggle-container">
-          <label for="terrain-toggle" data-localize="terrain">Terrain:</label>
-          <input type="checkbox" id="terrain-toggle" name="terrain-toggle">
-        </div>
-
-        <!-- Winter Mode Toggle Button -->
-        <div class="winter-toggle-container">
-          <label for="winter-toggle" data-localize="winter_mode">Winter Mode:</label>
-          <input type="checkbox" id="winter-toggle" name="winter-toggle">
-        </div>
-
-        <!-- World Scale Slider -->
-        <div class="scale-slider-container">
-          <label for="scale-value-slider" data-localize="world_scale">World Scale:</label>
-          <input type="range" id="scale-value-slider" name="scale-value-slider" min="0.30" max="2.5" step="0.1" value="1">
-          <span id="slider-value">1.00</span>
-        </div>
-        
-        <!-- Bounding Box Input -->
-        <div class="bbox-input-container">
-          <label for="bbox-coords" data-localize="custom_bounding_box">Custom Bounding Box:</label>
-          <input type="text" id="bbox-coords" name="bbox-coords" maxlength="55" style="width: 280px;" placeholder="Format: lat,lng,lat,lng">
-        </div>
-
-        <!-- Floodfill Timeout Input -->
-        <div class="timeout-input-container">
-          <label for="floodfill-timeout" data-localize="floodfill_timeout">Floodfill Timeout (sec):</label>
-          <input type="number" id="floodfill-timeout" name="floodfill-timeout" min="0" step="1" value="20" style="width: 100px;" placeholder="Seconds">
-        </div><br>
-
-        <!-- Ground Level Input -->
-        <div class="ground-level-input-container">
-          <label for="ground-level" data-localize="ground_level">Ground Level:</label>
-          <input type="number" id="ground-level" name="ground-level" min="-64" max="290" value="-62" style="width: 100px;" placeholder="Ground Level">
-        </div>
-
-        <!-- License and Credits Button -->
-        <button type="button" id="license-button" class="license-button" onclick="openLicense()" data-localize="license_and_credits">License and Credits</button>
-      </div>
-    </div>
-
-    <!-- License Modal -->
-    <div id="license-modal" class="modal" style="display: none;">
-      <div class="modal-content">
-        <span class="close-button" onclick="closeLicense()">&times;</span>
-        <h2 data-localize="license_and_credits">License and Credits</h2>
-        <div id="license-content" style="overflow-y: auto; max-height: 300px; font-size: 0.85em; line-height: 1.3; padding: 10px; border: 1px solid #ccc; border-radius: 4px;">
-          Loading...
-        </div>
-      </div>
-    </div>
-
-    <!-- Footer -->
-    <footer class="footer">
-      <a href="https://github.com/louis-e/arnis" target="_blank" class="footer-link" data-localize="footer_text">
-        © {year} Arnis v{version} by louis-e
-      </a>
-    </footer>
-  </main>
-</body>
-
-</html>

gui-src/js/main.js

@@ -1,508 +0,0 @@
-import { licenseText } from './license.js';
-
-let invoke;
-if (window.__TAURI__) {
-  invoke = window.__TAURI__.core.invoke;
-} else {
-  function dummyFunc() {}
-  window.__TAURI__ = { event: { listen: dummyFunc } };
-  invoke = dummyFunc;
-}
-
-const DEFAULT_LOCALE_PATH = `./locales/en.json`;
-
-// Initialize elements and start the demo progress
-window.addEventListener("DOMContentLoaded", async () => {
-  registerMessageEvent();
-  window.selectWorld = selectWorld;
-  window.startGeneration = startGeneration;
-  setupProgressListener();
-  initSettings();
-  initWorldPicker();
-  handleBboxInput();
-  const localization = await getLocalization();
-  await applyLocalization(localization);
-  initFooter();
-  await checkForUpdates();
-});
-
-/**
- * Checks if a JSON response is invalid or falls back to HTML
- * @param {Response} response - The fetch response object
- * @returns {boolean} True if the response is invalid JSON
- */
-function invalidJSON(response) {
-  // Workaround for Tauri always falling back to index.html for asset loading
-  return !response.ok || response.headers.get("Content-Type") === "text/html";
-}
-
-/**
- * Fetches and returns localization data based on user's language
- * Falls back to English if requested language is not available
- * @returns {Promise<Object>} The localization JSON object
- */
-async function getLocalization() {
-  const lang = navigator.language;
-  let response = await fetch(`./locales/${lang}.json`);
-
-  // Try with only first part of language code
-  if (invalidJSON(response)) {
-    response = await fetch(`./locales/${lang.split('-')[0]}.json`);
-
-    // Fallback to default English localization
-    if (invalidJSON(response)) {
-      response = await fetch(DEFAULT_LOCALE_PATH);
-    }
-  }
-
-  const localization = await response.json();
-  return localization;
-}
-
-/**
- * Updates an HTML element with localized text
- * @param {Object} json - Localization data
- * @param {Object} elementObject - Object containing element or selector
- * @param {string} localizedStringKey - Key for the localized string
- */
-async function localizeElement(json, elementObject, localizedStringKey) {
-  const element =
-    (!elementObject.element || elementObject.element === "")
-    ? document.querySelector(elementObject.selector) : elementObject.element;
-  const attribute = localizedStringKey.startsWith("placeholder_") ? "placeholder" : "textContent";
-
-  if (element) {
-    if (localizedStringKey in json) {
-      element[attribute] = json[localizedStringKey];
-    } else {
-      // Fallback to default (English) string
-      const response = await fetch(DEFAULT_LOCALE_PATH);
-      const defaultJson = await response.json();
-      element[attribute] = defaultJson[localizedStringKey];
-    }
-  }
-}
-
-async function applyLocalization(localization) {
-  const localizationElements = {
-    "h2[data-localize='select_location']": "select_location",
-    "#bbox-text": "zoom_in_and_choose",
-    "h2[data-localize='select_world']": "select_world",
-    "span[id='choose_world']": "choose_world",
-    "#selected-world": "no_world_selected",
-    "#start-button": "start_generation",
-    "h2[data-localize='progress']": "progress",
-    "h2[data-localize='choose_world_modal_title']": "choose_world_modal_title",
-    "button[data-localize='select_existing_world']": "select_existing_world",
-    "button[data-localize='generate_new_world']": "generate_new_world",
-    "h2[data-localize='customization_settings']": "customization_settings",
-    "label[data-localize='winter_mode']": "winter_mode",
-    "label[data-localize='world_scale']": "world_scale",
-    "label[data-localize='custom_bounding_box']": "custom_bounding_box",
-    "label[data-localize='floodfill_timeout']": "floodfill_timeout",
-    "label[data-localize='ground_level']": "ground_level",
-    ".footer-link": "footer_text",
-    "button[data-localize='license_and_credits']": "license_and_credits",
-    "h2[data-localize='license_and_credits']": "license_and_credits",
-
-    // Placeholder strings
-    "input[id='bbox-coords']": "placeholder_bbox",
-    "input[id='floodfill-timeout']": "placeholder_floodfill",
-    "input[id='ground-level']": "placeholder_ground"
-  };
-
-  for (const selector in localizationElements) {
-    localizeElement(localization, { selector: selector }, localizationElements[selector]);
-  }
-
-  // Update error messages
-  window.localization = localization;
-}
-
-// Function to initialize the footer with the current year and version
-async function initFooter() {
-  const currentYear = new Date().getFullYear();
-  let version = "x.x.x";
-
-  try {
-    version = await invoke('gui_get_version');
-  } catch (error) {
-    console.error("Failed to fetch version:", error);
-  }
-
-  const footerElement = document.querySelector(".footer-link");
-  if (footerElement) {
-    footerElement.textContent =
-      footerElement.textContent
-        .replace("{year}", currentYear)
-        .replace("{version}", version);
-  }
-}
-
-// Function to check for updates and display a notification if available
-async function checkForUpdates() {
-  try {
-    const isUpdateAvailable = await invoke('gui_check_for_updates');
-    if (isUpdateAvailable) {
-      const footer = document.querySelector(".footer");
-      const updateMessage = document.createElement("a");
-      updateMessage.href = "https://github.com/louis-e/arnis/releases";
-      updateMessage.target = "_blank";
-      updateMessage.style.color = "#fecc44";
-      updateMessage.style.marginTop = "-5px";
-      updateMessage.style.fontSize = "0.95em";
-      updateMessage.style.display = "block";
-      updateMessage.style.textDecoration = "none";
-
-      localizeElement(window.localization, { element: updateMessage }, "new_version_available");
-      footer.style.marginTop = "15px";
-      footer.appendChild(updateMessage);
-    }
-  } catch (error) {
-    console.error("Failed to check for updates: ", error);
-  }
-}
-
-// Function to register the event listener for bbox updates from iframe
-function registerMessageEvent() {
-  window.addEventListener('message', function (event) {
-    const bboxText = event.data.bboxText;
-
-    if (bboxText) {
-      console.log("Updated BBOX Coordinates:", bboxText);
-      displayBboxInfoText(bboxText);
-    }
-  });
-}
-
-// Function to set up the progress bar listener
-function setupProgressListener() {
-  const progressBar = document.getElementById("progress-bar");
-  const progressMessage = document.getElementById("progress-message");
-  const progressDetail = document.getElementById("progress-detail");
-
-  window.__TAURI__.event.listen("progress-update", (event) => {
-    const { progress, message } = event.payload;
-
-    if (progress != -1) {
-      progressBar.style.width = `${progress}%`;
-      progressDetail.textContent = `${Math.round(progress)}%`;
-    }
-
-    if (message != "") {
-      progressMessage.textContent = message;
-
-      if (message.startsWith("Error!")) {
-        progressMessage.style.color = "#fa7878";
-        generationButtonEnabled = true;
-      } else if (message.startsWith("Done!")) {
-        progressMessage.style.color = "#7bd864";
-        generationButtonEnabled = true;
-      } else {
-        progressMessage.style.color = "";
-      }
-    }
-  });
-}
-
-function initSettings() {
-  // Settings
-  const settingsModal = document.getElementById("settings-modal");
-  const slider = document.getElementById("scale-value-slider");
-  const sliderValue = document.getElementById("slider-value");
-  
-  // Open settings modal
-  function openSettings() {
-    settingsModal.style.display = "flex";
-    settingsModal.style.justifyContent = "center";
-    settingsModal.style.alignItems = "center";
-  }
-
-  // Close settings modal
-  function closeSettings() {
-    settingsModal.style.display = "none";
-  }
-  
-  window.openSettings = openSettings;
-  window.closeSettings = closeSettings;
-
-  // Update slider value display
-  slider.addEventListener("input", () => {
-    sliderValue.textContent = parseFloat(slider.value).toFixed(2);
-  });
-
-
-  /// License and Credits
-  function openLicense() {
-    const licenseModal = document.getElementById("license-modal");
-    const licenseContent = document.getElementById("license-content");
-
-    // Render the license text as HTML
-    licenseContent.innerHTML = licenseText;
-
-    // Show the modal
-    licenseModal.style.display = "flex";
-    licenseModal.style.justifyContent = "center";
-    licenseModal.style.alignItems = "center";
-  }
-
-  function closeLicense() {
-    const licenseModal = document.getElementById("license-modal");
-    licenseModal.style.display = "none";
-  }
-
-  window.openLicense = openLicense;
-  window.closeLicense = closeLicense;
-}
-
-function initWorldPicker() {
-  // World Picker
-  const worldPickerModal = document.getElementById("world-modal");
-  
-  // Open world picker modal
-  function openWorldPicker() {
-    worldPickerModal.style.display = "flex";
-    worldPickerModal.style.justifyContent = "center";
-    worldPickerModal.style.alignItems = "center";
-  }
-
-  // Close world picker modal
-  function closeWorldPicker() {
-    worldPickerModal.style.display = "none";
-  }
-  
-  window.openWorldPicker = openWorldPicker;
-  window.closeWorldPicker = closeWorldPicker;
-}
-
-/**
- * Validates and processes bounding box coordinates input
- * Supports both comma and space-separated formats
- * Updates the map display when valid coordinates are entered
- */
-function handleBboxInput() {
-  const inputBox = document.getElementById("bbox-coords");
-  const bboxInfo = document.getElementById("bbox-info");
-
-  inputBox.addEventListener("input", function () {
-      const input = inputBox.value.trim();
-
-      if (input === "") {
-          bboxInfo.textContent = "";
-          bboxInfo.style.color = "";
-          selectedBBox = "";
-          return;
-      }
-
-      // Regular expression to validate bbox input (supports both comma and space-separated formats)
-      const bboxPattern = /^(-?\d+(\.\d+)?)[,\s](-?\d+(\.\d+)?)[,\s](-?\d+(\.\d+)?)[,\s](-?\d+(\.\d+)?)$/;
-
-      if (bboxPattern.test(input)) {
-          const matches = input.match(bboxPattern);
-
-          // Extract coordinates (Lat / Lng order expected)
-          const lat1 = parseFloat(matches[1]);
-          const lng1 = parseFloat(matches[3]);
-          const lat2 = parseFloat(matches[5]);
-          const lng2 = parseFloat(matches[7]);
-
-          // Validate latitude and longitude ranges in the expected Lat / Lng order
-          if (
-              lat1 >= -90 && lat1 <= 90 &&
-              lng1 >= -180 && lng1 <= 180 &&
-              lat2 >= -90 && lat2 <= 90 &&
-              lng2 >= -180 && lng2 <= 180
-          ) {
-              // Input is valid; trigger the event
-              const bboxText = `${lat1} ${lng1} ${lat2} ${lng2}`;
-              window.dispatchEvent(new MessageEvent('message', { data: { bboxText } }));
-
-              // Show custom bbox on the map
-              let map_container = document.querySelector('.map-container');
-              map_container.setAttribute('src', `maps.html#${lat1},${lng1},${lat2},${lng2}`);
-              map_container.contentWindow.location.reload();
-
-              // Update the info text
-              localizeElement(window.localization, { element: bboxInfo }, "custom_selection_confirmed");
-              bboxInfo.style.color = "#7bd864";
-          } else {
-              // Valid numbers but invalid order or range
-              localizeElement(window.localization, { element: bboxInfo }, "error_coordinates_out_of_range");
-              bboxInfo.style.color = "#fecc44";
-              selectedBBox = "";
-          }
-      } else {
-          // Input doesn't match the required format
-          localizeElement(window.localization, { element: bboxInfo }, "invalid_format");
-          bboxInfo.style.color = "#fecc44";
-          selectedBBox = "";
-      }
-  });
-}
-
-/**
- * Calculates the approximate area of a bounding box in square meters
- * Uses the Haversine formula for geodesic calculations
- * @param {number} lng1 - First longitude coordinate
- * @param {number} lat1 - First latitude coordinate
- * @param {number} lng2 - Second longitude coordinate
- * @param {number} lat2 - Second latitude coordinate
- * @returns {number} Area in square meters
- */
-function calculateBBoxSize(lng1, lat1, lng2, lat2) {
-  // Approximate distance calculation using Haversine formula or geodesic formula
-  const toRad = (angle) => (angle * Math.PI) / 180;
-  const R = 6371000; // Earth radius in meters
-
-  const latDistance = toRad(lat2 - lat1);
-  const lngDistance = toRad(lng2 - lng1);
-
-  const a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2) +
-    Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) *
-    Math.sin(lngDistance / 2) * Math.sin(lngDistance / 2);
-  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
-
-  // Width and height of the box
-  const height = R * latDistance;
-  const width = R * lngDistance;
-
-  return Math.abs(width * height);
-}
-
-/**
- * Normalizes a longitude value to the range [-180, 180]
- * @param {number} lon - Longitude value to normalize
- * @returns {number} Normalized longitude value
- */
-function normalizeLongitude(lon) {
-  return ((lon + 180) % 360 + 360) % 360 - 180;
-}
-
-const threshold1 = 30000000.00;
-const threshold2 = 45000000.00;
-let selectedBBox = "";
-
-// Function to handle incoming bbox data
-function displayBboxInfoText(bboxText) {
-  let [lng1, lat1, lng2, lat2] = bboxText.split(" ").map(Number);
-
-  // Normalize longitudes
-  lat1 = parseFloat(normalizeLongitude(lat1).toFixed(6));
-  lat2 = parseFloat(normalizeLongitude(lat2).toFixed(6));
-  selectedBBox = `${lng1} ${lat1} ${lng2} ${lat2}`;
-
-  const bboxInfo = document.getElementById("bbox-info");
-
-  // Reset the info text if the bbox is 0,0,0,0
-  if (lng1 === 0 && lat1 === 0 && lng2 === 0 && lat2 === 0) {
-    bboxInfo.textContent = "";
-    selectedBBox = "";
-    return;
-  }
-
-  // Calculate the size of the selected bbox
-  const selectedSize = calculateBBoxSize(lng1, lat1, lng2, lat2);
-
-  if (selectedSize > threshold2) {
-    localizeElement(window.localization, { element: bboxInfo }, "area_too_large");
-    bboxInfo.style.color = "#fa7878";
-  } else if (selectedSize > threshold1) {
-    localizeElement(window.localization, { element: bboxInfo }, "area_extensive");
-    bboxInfo.style.color = "#fecc44";
-  } else {
-    localizeElement(window.localization, { element: bboxInfo }, "selection_confirmed");
-    bboxInfo.style.color = "#7bd864";
-  }
-}
-
-let worldPath = "";
-async function selectWorld(generate_new_world) {
-  try {
-    const worldName = await invoke('gui_select_world', { generateNew: generate_new_world } );
-    if (worldName) {
-      worldPath = worldName;
-      const lastSegment = worldName.split(/[\\/]/).pop();
-      document.getElementById('selected-world').textContent = lastSegment;
-      document.getElementById('selected-world').style.color = "#fecc44";
-    }
-  } catch (error) {
-    handleWorldSelectionError(error);
-  }
-
-  closeWorldPicker();
-}
-
-/**
- * Handles world selection errors and displays appropriate messages
- * @param {number} errorCode - Error code from the backend
- */
-function handleWorldSelectionError(errorCode) {
-  const errorKeys = {
-    1: "minecraft_directory_not_found",
-    2: "world_in_use",
-    3: "failed_to_create_world",
-    4: "no_world_selected_error"
-  };
-
-  const errorKey = errorKeys[errorCode] || "unknown_error";
-  const selectedWorld = document.getElementById('selected-world');
-  localizeElement(window.localization, { element: selectedWorld }, errorKey);
-  selectedWorld.style.color = "#fa7878";
-  worldPath = "";
-  console.error(errorCode);
-}
-
-let generationButtonEnabled = true;
-/**
- * Initiates the world generation process
- * Validates required inputs and sends generation parameters to the backend
- * @returns {Promise<void>}
- */
-async function startGeneration() {
-  try {
-    if (generationButtonEnabled === false) {
-      return;
-    }
-
-    if (!selectedBBox || selectedBBox == "0.000000 0.000000 0.000000 0.000000") {
-      const bboxInfo = document.getElementById('bbox-info');
-      localizeElement(window.localization, { element: bboxInfo }, "select_location_first");
-      bboxInfo.style.color = "#fa7878";
-      return;
-    }
-
-    if (!worldPath || worldPath === "") {
-      const selectedWorld = document.getElementById('selected-world');
-      localizeElement(window.localization, { element: selectedWorld }, "select_minecraft_world_first");
-      selectedWorld.style.color = "#fa7878";
-      return;
-    }
-
-    var terrain = document.getElementById("terrain-toggle").checked;
-    var winter_mode = document.getElementById("winter-toggle").checked;
-    var scale = parseFloat(document.getElementById("scale-value-slider").value);
-    var floodfill_timeout = parseInt(document.getElementById("floodfill-timeout").value, 10);
-    var ground_level = parseInt(document.getElementById("ground-level").value, 10);
-
-    // Validate floodfill_timeout and ground_level
-    floodfill_timeout = isNaN(floodfill_timeout) || floodfill_timeout < 0 ? 20 : floodfill_timeout;
-    ground_level = isNaN(ground_level) || ground_level < -62 ? 20 : ground_level;
-
-    // Pass the bounding box and selected world to the Rust backend
-    await invoke("gui_start_generation", {
-        bboxText: selectedBBox,
-        selectedWorld: worldPath,
-        worldScale: scale,
-        groundLevel: ground_level,
-        winterMode: winter_mode,
-        floodfillTimeout: floodfill_timeout,
-        terrainEnabled: terrain
-    });
-
-    console.log("Generation process started.");
-    generationButtonEnabled = false;
-  } catch (error) {
-    console.error("Error starting generation:", error);
-    generationButtonEnabled = true;
-  }
-}

gui-src/js/maps/test.runner.js

@@ -1,158 +0,0 @@
-(function( definition ) { // execute immeidately
-
-	if ( typeof module !== 'undefined' &&
-	     typeof module.exports !== 'undefined' ) {
-		module.exports = definition();
-	}
-	else if ( typeof window === "object" ) {
-		// example run syntax: BBOX_T( { 'url' : '/js/maps/testdata.js' } );
-		window.BBOX_T = definition();
-	}
-
-
-})( function() {
-	'use strict';
-	
-	/*
-	**
-	**  constructor
-	**
-	*/
-	var TestRunner = function( options ) {
-		options || ( options = {} );
-
-		if( !this || !(this instanceof TestRunner )){
-			return new TestRunner( options );
-		}
-
-		this.test_url = options.url || "";
-
-		this.global_setup(); // execute immediately
-	};
-
-	/*
-	** 
-	**  functions
-	**
-	*/
-	TestRunner.prototype.global_setup = function() {
-		
-		var self = this; // hold ref to instance
-
-		$.ajax({
-			'url' :  this.test_url ,
-			'dataType' : 'json'
-		})
-		.done( function( json_data ) {
-			self.run_this_mother.call( self, json_data );
-		})
-		.fail( function( error ) {
-			console.log( "The test data didn't load: ", error );
-		});
-
-	};
-	
-	TestRunner.prototype.single_setup = function() {
-		this.get_layer_count();
-	};
-
-	TestRunner.prototype.tear_down = function() {
-		if( this._draw_delete_handler ){
-			this._draw_delete_handler.off('draw:deleted');
-		}
-	};
-
-	TestRunner.prototype.run_this_mother = function( json_data ) {
-		for( var key in json_data ){
-			console.log( "[ RUNNING ]: test " + json_data[key]['type'] + "->" + "simple=" + json_data[key]['simple'] );
-			var data = json_data[key]['data']; 	
-			if( json_data[key]['type'] === 'geojson' ) {
-				data = JSON.stringify( data );
-			}
-			
-			/*
-			**  run different tests
-			**  the context here is jQuery, so change
-			**  to reference the instance
-			*/
-			this.single_setup();
-
-			this.test_parsing( data, json_data );
-			this.test_add2map( json_data );
-			this.test_deletable( json_data );
-
-			this.tear_down();
-		}
-	};
-
-	TestRunner.prototype.test_deletable = function(identifier){ // TODO: this needs work
-		var toolbar = null;
-		// get the right toolbar, depending on attributes
-		for( var key in drawControl._toolbars ){
-			var tbar = drawControl._toolbars[key];
-			if ( !(tbar instanceof L.EditToolbar ) ){ 
-				continue;	
-			}
-
-			toolbar = tbar; // set the right one;
-		}
-
-		// create delete handler that makes sure things are deleted
-	    	this._draw_delete_handler = map.on('draw:deleted', function (e) {
-			try {
-				e.layers.eachLayer(function (l) {
-				    drawnItems.removeLayer(l);
-				});
-				console.warn( "[ PASSED ]: test_deletable" );
-			}
-			catch ( err ) {
-				console.error( "[ DELETE TEST FAIL ]: ", err.message, identifier );
-			}
-		});
-
-
-        // loop through this toolbars featureGroup, delete layers
-        if ( !toolbar._activeMode ) {
-            toolbar._modes['remove'].button.click(); // enable deletable
-        }
-        for( var indx in toolbar.options['featureGroup']._layers ) {
-            try {
-                var lyr = toolbar.options['featureGroup']._layers[indx];
-                lyr.fire( 'click' ); // triggers delete
-            }
-            catch ( err ){
-                console.error( "[ DELETE TEST FAIL ]: ", err.message, identifier );
-            }
-        }
-        // WTF?
-        $('a[title="Save changes."]')[0].click();  // disable deletable
-
-	};
-
-	TestRunner.prototype.test_add2map = function(identifier){
-		var current_num = Object.keys( map._layers ).length;
-		if( current_num <= this.num_layers_before_parse ){
-			console.error( "[ ADD2MAP TEST FAIL ]: ", identifier );
-		}
-		else {
-			console.warn( "[ PASSED ]: test_add2map" );
-		}
-	};
-
-	TestRunner.prototype.get_layer_count = function(){
-		this.num_layers_before_parse = Object.keys( map._layers ).length;
-	};
-
-	TestRunner.prototype.test_parsing = function( data, identifier ){
-		var is_valid = FormatSniffer( { data : data } ).sniff();
-		if ( !is_valid ) {
-			console.error( "[ PARSE TEST FAIL ]: ", identifier );
-		}
-		else {
-			console.warn( "[ PASSED ]: test_parsing" );
-		}
-	};
-
-	return TestRunner; // return class def
-
-});

src/args.rs

@@ -1,107 +1,145 @@
-use clap::{ArgGroup, Parser};
-use colored::Colorize;
-use std::path::Path;
-use std::process::exit;
+use crate::coordinate_system::geographic::LLBBox;
+use clap::Parser;
+use std::path::PathBuf;
 use std::time::Duration;
 
 /// Command-line arguments parser
 #[derive(Parser, Debug)]
 #[command(author, version, about)]
-#[command(group(
-    ArgGroup::new("location")
-        .required(true)
-        .args(&["bbox", "file"])
-))]
 pub struct Args {
-    /// Bounding box of the area (min_lng,min_lat,max_lng,max_lat) (required)
-    #[arg(long, allow_hyphen_values = true)]
-    pub bbox: Option<String>,
+    /// Bounding box of the area (min_lat,min_lng,max_lat,max_lng) (required)
+    #[arg(long, allow_hyphen_values = true, value_parser = LLBBox::from_str)]
+    pub bbox: LLBBox,
 
     /// JSON file containing OSM data (optional)
-    #[arg(long)]
+    #[arg(long, group = "location")]
     pub file: Option<String>,
 
+    /// JSON file to save OSM data to (optional)
+    #[arg(long, group = "location")]
+    pub save_json_file: Option<String>,
+
     /// Path to the Minecraft world (required)
-    #[arg(long, required = true)]
-    pub path: String,
+    #[arg(long, value_parser = validate_minecraft_world_path)]
+    pub path: PathBuf,
 
     /// Downloader method (requests/curl/wget) (optional)
     #[arg(long, default_value = "requests")]
     pub downloader: String,
 
     /// World scale to use, in blocks per meter
-    #[arg(long, default_value = "1.0")]
+    #[arg(long, default_value_t = 1.0)]
     pub scale: f64,
 
     /// Ground level to use in the Minecraft world
     #[arg(long, default_value_t = -62)]
     pub ground_level: i32,
 
-    /// Enable winter mode (default: false)
-    #[arg(long, default_value_t = false)]
-    pub winter: bool,
-
     /// Enable terrain (optional)
-    #[arg(long, default_value_t = false, action = clap::ArgAction::SetFalse)]
+    #[arg(long)]
     pub terrain: bool,
 
+    /// Enable interior generation (optional)
+    #[arg(long, default_value_t = true, action = clap::ArgAction::SetTrue)]
+    pub interior: bool,
+
+    /// Enable roof generation (optional)
+    #[arg(long, default_value_t = true, action = clap::ArgAction::SetTrue)]
+    pub roof: bool,
+
+    /// Enable filling ground (optional)
+    #[arg(long, default_value_t = false, action = clap::ArgAction::SetFalse)]
+    pub fillground: bool,
+
     /// Enable debug mode (optional)
-    #[arg(long, default_value_t = false, action = clap::ArgAction::SetTrue)]
+    #[arg(long)]
     pub debug: bool,
 
     /// Set floodfill timeout (seconds) (optional)
     #[arg(long, value_parser = parse_duration)]
     pub timeout: Option<Duration>,
+
+    /// Generate a top-down map preview image after world generation (optional)
+    #[arg(long)]
+    pub generate_map: bool,
+
+    /// Spawn point coordinates (lat, lng)
+    #[arg(skip)]
+    pub spawn_point: Option<(f64, f64)>,
 }
 
-impl Args {
-    pub fn run(&self) {
-        // Validating the world path
-        let mc_world_path: &Path = Path::new(&self.path);
-        if !mc_world_path.join("region").exists() {
-            eprintln!(
-                "{}",
-                "Error! No Minecraft world found at the given path"
-                    .red()
-                    .bold()
-            );
-            exit(1);
-        }
-
-        // Validating bbox if provided
-        if let Some(bbox) = &self.bbox {
-            if !validate_bounding_box(bbox) {
-                eprintln!("{}", "Error! Invalid bbox input".red().bold());
-                exit(1);
-            }
-        }
+fn validate_minecraft_world_path(path: &str) -> Result<PathBuf, String> {
+    let mc_world_path = PathBuf::from(path);
+    if !mc_world_path.exists() {
+        return Err(format!("Path does not exist: {path}"));
     }
-}
-
-/// Validates the bounding box string
-fn validate_bounding_box(bbox: &str) -> bool {
-    let parts: Vec<&str> = bbox.split(',').collect();
-    if parts.len() != 4 {
-        return false;
+    if !mc_world_path.is_dir() {
+        return Err(format!("Path is not a directory: {path}"));
     }
-
-    let min_lng: f64 = parts[0].parse().ok().unwrap_or(0.0);
-    let min_lat: f64 = parts[1].parse().ok().unwrap_or(0.0);
-    let max_lng: f64 = parts[2].parse().ok().unwrap_or(0.0);
-    let max_lat: f64 = parts[3].parse().ok().unwrap_or(0.0);
-
-    if !(-180.0..=180.0).contains(&min_lng) || !(-180.0..=180.0).contains(&max_lng) {
-        return false;
+    let region = mc_world_path.join("region");
+    if !region.is_dir() {
+        return Err(format!("No Minecraft world found at {region:?}"));
     }
-
-    if !(-90.0..=90.0).contains(&min_lat) || !(-90.0..=90.0).contains(&max_lat) {
-        return false;
-    }
-
-    min_lng < max_lng && min_lat < max_lat
+    Ok(mc_world_path)
 }
 
 fn parse_duration(arg: &str) -> Result<std::time::Duration, std::num::ParseIntError> {
     let seconds = arg.parse()?;
     Ok(std::time::Duration::from_secs(seconds))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn minecraft_tmpdir() -> tempfile::TempDir {
+        let tmpdir = tempfile::tempdir().unwrap();
+        // create a `region` directory in the tempdir
+        let region_path = tmpdir.path().join("region");
+        std::fs::create_dir(&region_path).unwrap();
+        tmpdir
+    }
+    #[test]
+    fn test_flags() {
+        let tmpdir = minecraft_tmpdir();
+        let tmp_path = tmpdir.path().to_str().unwrap();
+
+        // Test that terrain/debug are SetTrue
+        let cmd = [
+            "arnis",
+            "--path",
+            tmp_path,
+            "--bbox",
+            "1,2,3,4",
+            "--terrain",
+            "--debug",
+        ];
+        let args = Args::parse_from(cmd.iter());
+        assert!(args.debug);
+        assert!(args.terrain);
+
+        let cmd = ["arnis", "--path", tmp_path, "--bbox", "1,2,3,4"];
+        let args = Args::parse_from(cmd.iter());
+        assert!(!args.debug);
+        assert!(!args.terrain);
+    }
+
+    #[test]
+    fn test_required_options() {
+        let tmpdir = minecraft_tmpdir();
+        let tmp_path = tmpdir.path().to_str().unwrap();
+
+        let cmd = ["arnis"];
+        assert!(Args::try_parse_from(cmd.iter()).is_err());
+
+        let cmd = ["arnis", "--path", tmp_path, "--bbox", "1,2,3,4"];
+        assert!(Args::try_parse_from(cmd.iter()).is_ok());
+
+        let cmd = ["arnis", "--path", tmp_path, "--file", ""];
+        assert!(Args::try_parse_from(cmd.iter()).is_err());
+
+        // The --gui flag isn't used here, ugh. TODO clean up main.rs and its argparse usage.
+        // let cmd = ["arnis", "--gui"];
+        // assert!(Args::try_parse_from(cmd.iter()).is_ok());
+    }
+}

src/block_definitions.rs

@@ -7,22 +7,93 @@ use std::collections::HashMap;
 
 use crate::colors::RGBTuple;
 
+// Enums for stair properties
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+pub enum StairFacing {
+    North,
+    East,
+    South,
+    West,
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+pub enum StairShape {
+    Straight,
+    InnerLeft,
+    InnerRight,
+    OuterLeft,
+    OuterRight,
+}
+
+impl StairFacing {
+    #[inline(always)]
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            StairFacing::North => "north",
+            StairFacing::East => "east",
+            StairFacing::South => "south",
+            StairFacing::West => "west",
+        }
+    }
+}
+
+impl StairShape {
+    #[inline(always)]
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            StairShape::Straight => "straight",
+            StairShape::InnerLeft => "inner_left",
+            StairShape::InnerRight => "inner_right",
+            StairShape::OuterLeft => "outer_left",
+            StairShape::OuterRight => "outer_right",
+        }
+    }
+}
+
+// Type definitions for better readability
+type ColorTuple = (u8, u8, u8);
+type BlockOptions = &'static [Block];
+type ColorBlockMapping = (ColorTuple, BlockOptions);
+
 #[derive(Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Hash, Debug)]
 pub struct Block {
     id: u8,
 }
 
+// Extended block with dynamic properties
+#[derive(Clone, Debug)]
+pub struct BlockWithProperties {
+    pub block: Block,
+    pub properties: Option<Value>,
+}
+
+impl BlockWithProperties {
+    pub fn new(block: Block, properties: Option<Value>) -> Self {
+        Self { block, properties }
+    }
+
+    pub fn simple(block: Block) -> Self {
+        Self {
+            block,
+            properties: None,
+        }
+    }
+}
+
 impl Block {
+    #[inline(always)]
     const fn new(id: u8) -> Self {
         Self { id }
     }
 
+    #[inline(always)]
     pub fn id(&self) -> u8 {
         self.id
     }
 
+    #[inline(always)]
     pub fn namespace(&self) -> &str {
-        "mincraft"
+        "minecraft"
     }
 
     pub fn name(&self) -> &str {
@@ -41,7 +112,7 @@ impl Block {
             11 => "chiseled_stone_bricks",
             12 => "cobblestone_wall",
             13 => "cobblestone",
-            14 => "cracked_polished_blackstone_bricks",
+            14 => "polished_blackstone_bricks",
             15 => "cracked_stone_bricks",
             16 => "crimson_planks",
             17 => "cut_sandstone",
@@ -52,11 +123,11 @@ impl Block {
             22 => "dirt",
             23 => "end_stone_bricks",
             24 => "farmland",
-            25 => "glass_pane",
+            25 => "glass",
             26 => "glowstone",
             27 => "granite",
             28 => "grass_block",
-            29 => "tall_grass",
+            29 => "short_grass",
             30 => "gravel",
             31 => "gray_concrete",
             32 => "gray_terracotta",
@@ -74,7 +145,7 @@ impl Block {
             44 => "mossy_cobblestone",
             45 => "mud_bricks",
             46 => "nether_bricks",
-            47 => "nether_bricks",
+            47 => "netherite_block",
             48 => "oak_fence",
             49 => "oak_leaves",
             50 => "oak_log",
@@ -84,7 +155,7 @@ impl Block {
             54 => "podzol",
             55 => "polished_andesite",
             56 => "polished_basalt",
-            57 => "polished_blackstone_bricks",
+            57 => "quartz_block",
             58 => "polished_blackstone",
             59 => "polished_deepslate",
             60 => "polished_diorite",
@@ -144,12 +215,75 @@ impl Block {
             114 => "andesite_wall",
             115 => "stone_brick_wall",
             116..=125 => "rail",
+            126 => "coarse_dirt",
+            127 => "iron_ore",
+            128 => "coal_ore",
+            129 => "gold_ore",
+            130 => "copper_ore",
+            131 => "clay",
+            132 => "dirt_path",
+            133 => "ice",
+            134 => "packed_ice",
+            135 => "mud",
+            136 => "dead_bush",
+            137..=138 => "tall_grass",
+            139 => "crafting_table",
+            140 => "furnace",
+            141 => "white_carpet",
+            142 => "bookshelf",
+            143 => "oak_pressure_plate",
+            144 => "oak_stairs",
+            155 => "chest",
+            156 => "red_carpet",
+            157 => "anvil",
+            158 => "note_block",
+            159 => "oak_door",
+            160 => "brewing_stand",
+            161 => "red_bed", // North head
+            162 => "red_bed", // North foot
+            163 => "red_bed", // East head
+            164 => "red_bed", // East foot
+            165 => "red_bed", // South head
+            166 => "red_bed", // South foot
+            167 => "red_bed", // West head
+            168 => "red_bed", // West foot
+            169 => "gray_stained_glass",
+            170 => "light_gray_stained_glass",
+            171 => "brown_stained_glass",
+            172 => "tinted_glass",
+            173 => "oak_trapdoor",
+            174 => "brown_concrete",
+            175 => "black_terracotta",
+            176 => "brown_terracotta",
+            177 => "stone_brick_stairs",
+            178 => "mud_brick_stairs",
+            179 => "polished_blackstone_brick_stairs",
+            180 => "brick_stairs",
+            181 => "polished_granite_stairs",
+            182 => "end_stone_brick_stairs",
+            183 => "polished_diorite_stairs",
+            184 => "smooth_sandstone_stairs",
+            185 => "quartz_stairs",
+            186 => "polished_andesite_stairs",
+            187 => "nether_brick_stairs",
             _ => panic!("Invalid id"),
         }
     }
 
     pub fn properties(&self) -> Option<Value> {
         match self.id {
+            3 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("persistent".to_string(), Value::String("true".to_string()));
+                map
+            })),
+
+            49 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("persistent".to_string(), Value::String("true".to_string()));
+                map
+            })),
+
             105 => Some(Value::Compound({
                 let mut map: HashMap<String, Value> = HashMap::new();
                 map.insert("age".to_string(), Value::String("7".to_string()));
@@ -264,11 +398,126 @@ impl Block {
                 map.insert("shape".to_string(), Value::String("south_west".to_string()));
                 map
             })),
+            137 => Some(Value::Compound({
+                let mut map = HashMap::new();
+                map.insert("half".to_string(), Value::String("lower".to_string()));
+                map
+            })),
+            138 => Some(Value::Compound({
+                let mut map = HashMap::new();
+                map.insert("half".to_string(), Value::String("upper".to_string()));
+                map
+            })),
+
+            // Red bed variations by direction and part
+            161 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("facing".to_string(), Value::String("north".to_string()));
+                map.insert("part".to_string(), Value::String("head".to_string()));
+                map
+            })),
+            162 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("facing".to_string(), Value::String("north".to_string()));
+                map.insert("part".to_string(), Value::String("foot".to_string()));
+                map
+            })),
+            163 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("facing".to_string(), Value::String("east".to_string()));
+                map.insert("part".to_string(), Value::String("head".to_string()));
+                map
+            })),
+            164 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("facing".to_string(), Value::String("east".to_string()));
+                map.insert("part".to_string(), Value::String("foot".to_string()));
+                map
+            })),
+            165 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("facing".to_string(), Value::String("south".to_string()));
+                map.insert("part".to_string(), Value::String("head".to_string()));
+                map
+            })),
+            166 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("facing".to_string(), Value::String("south".to_string()));
+                map.insert("part".to_string(), Value::String("foot".to_string()));
+                map
+            })),
+            167 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("facing".to_string(), Value::String("west".to_string()));
+                map.insert("part".to_string(), Value::String("head".to_string()));
+                map
+            })),
+            168 => Some(Value::Compound({
+                let mut map: HashMap<String, Value> = HashMap::new();
+                map.insert("facing".to_string(), Value::String("west".to_string()));
+                map.insert("part".to_string(), Value::String("foot".to_string()));
+                map
+            })),
+            173 => Some(Value::Compound({
+                let mut map = HashMap::new();
+                map.insert("half".to_string(), Value::String("top".to_string()));
+                map
+            })),
             _ => None,
         }
     }
 }
 
+// Cache for stair blocks with properties
+use std::sync::Mutex;
+
+#[allow(clippy::type_complexity)]
+static STAIR_CACHE: Lazy<Mutex<HashMap<(u8, StairFacing, StairShape), BlockWithProperties>>> =
+    Lazy::new(|| Mutex::new(HashMap::new()));
+
+// General function to create any stair block with facing and shape properties
+pub fn create_stair_with_properties(
+    base_stair_block: Block,
+    facing: StairFacing,
+    shape: StairShape,
+) -> BlockWithProperties {
+    let cache_key = (base_stair_block.id(), facing, shape);
+
+    // Check cache first
+    {
+        let cache = STAIR_CACHE.lock().unwrap();
+        if let Some(cached_block) = cache.get(&cache_key) {
+            return cached_block.clone();
+        }
+    }
+
+    // Create properties
+    let mut map = HashMap::new();
+    map.insert(
+        "facing".to_string(),
+        Value::String(facing.as_str().to_string()),
+    );
+
+    // Only add shape if it's not straight (default)
+    if !matches!(shape, StairShape::Straight) {
+        map.insert(
+            "shape".to_string(),
+            Value::String(shape.as_str().to_string()),
+        );
+    }
+
+    let properties = Value::Compound(map);
+    let block_with_props = BlockWithProperties::new(base_stair_block, Some(properties));
+
+    // Cache the result
+    {
+        let mut cache = STAIR_CACHE.lock().unwrap();
+        cache.insert(cache_key, block_with_props.clone());
+    }
+
+    block_with_props
+}
+
 // Lazy static blocks
 pub const ACACIA_PLANKS: Block = Block::new(0);
 pub const AIR: Block = Block::new(1);
@@ -284,7 +533,7 @@ pub const CAULDRON: Block = Block::new(10);
 pub const CHISELED_STONE_BRICKS: Block = Block::new(11);
 pub const COBBLESTONE_WALL: Block = Block::new(12);
 pub const COBBLESTONE: Block = Block::new(13);
-pub const CRACKED_POLISHED_BLACKSTONE_BRICKS: Block = Block::new(14);
+pub const POLISHED_BLACKSTONE_BRICKS: Block = Block::new(14);
 pub const CRACKED_STONE_BRICKS: Block = Block::new(15);
 pub const CRIMSON_PLANKS: Block = Block::new(16);
 pub const CUT_SANDSTONE: Block = Block::new(17);
@@ -317,7 +566,7 @@ pub const MOSS_BLOCK: Block = Block::new(43);
 pub const MOSSY_COBBLESTONE: Block = Block::new(44);
 pub const MUD_BRICKS: Block = Block::new(45);
 pub const NETHER_BRICK: Block = Block::new(46);
-pub const NETHER_BRICKS: Block = Block::new(47);
+pub const NETHERITE_BLOCK: Block = Block::new(47);
 pub const OAK_FENCE: Block = Block::new(48);
 pub const OAK_LEAVES: Block = Block::new(49);
 pub const OAK_LOG: Block = Block::new(50);
@@ -327,7 +576,7 @@ pub const ORANGE_TERRACOTTA: Block = Block::new(53);
 pub const PODZOL: Block = Block::new(54);
 pub const POLISHED_ANDESITE: Block = Block::new(55);
 pub const POLISHED_BASALT: Block = Block::new(56);
-pub const POLISHED_BLACKSTONE_BRICKS: Block = Block::new(57);
+pub const QUARTZ_BLOCK: Block = Block::new(57);
 pub const POLISHED_BLACKSTONE: Block = Block::new(58);
 pub const POLISHED_DEEPSLATE: Block = Block::new(59);
 pub const POLISHED_DIORITE: Block = Block::new(60);
@@ -338,7 +587,7 @@ pub const PURPUR_PILLAR: Block = Block::new(64);
 pub const QUARTZ_BRICKS: Block = Block::new(65);
 pub const RAIL: Block = Block::new(66);
 pub const RED_FLOWER: Block = Block::new(67);
-pub const RED_NETHER_BRICKS: Block = Block::new(68);
+pub const RED_NETHER_BRICK: Block = Block::new(68);
 pub const RED_TERRACOTTA: Block = Block::new(69);
 pub const RED_WOOL: Block = Block::new(70);
 pub const SAND: Block = Block::new(71);
@@ -380,15 +629,12 @@ pub const SNOW_LAYER: Block = Block::new(112);
 pub const SIGN: Block = Block::new(113);
 pub const ANDESITE_WALL: Block = Block::new(114);
 pub const STONE_BRICK_WALL: Block = Block::new(115);
-
 pub const CARROTS: Block = Block::new(105);
 pub const DARK_OAK_DOOR_LOWER: Block = Block::new(106);
 pub const DARK_OAK_DOOR_UPPER: Block = Block::new(107);
 pub const POTATOES: Block = Block::new(108);
 pub const WHEAT: Block = Block::new(109);
-
 pub const BEDROCK: Block = Block::new(110);
-
 pub const RAIL_NORTH_SOUTH: Block = Block::new(116);
 pub const RAIL_EAST_WEST: Block = Block::new(117);
 pub const RAIL_ASCENDING_EAST: Block = Block::new(118);
@@ -399,97 +645,363 @@ pub const RAIL_NORTH_EAST: Block = Block::new(122);
 pub const RAIL_NORTH_WEST: Block = Block::new(123);
 pub const RAIL_SOUTH_EAST: Block = Block::new(124);
 pub const RAIL_SOUTH_WEST: Block = Block::new(125);
+pub const COARSE_DIRT: Block = Block::new(126);
+pub const IRON_ORE: Block = Block::new(127);
+pub const COAL_ORE: Block = Block::new(128);
+pub const GOLD_ORE: Block = Block::new(129);
+pub const COPPER_ORE: Block = Block::new(130);
+pub const CLAY: Block = Block::new(131);
+pub const DIRT_PATH: Block = Block::new(132);
+pub const ICE: Block = Block::new(133);
+pub const PACKED_ICE: Block = Block::new(134);
+pub const MUD: Block = Block::new(135);
+pub const DEAD_BUSH: Block = Block::new(136);
+pub const TALL_GRASS_BOTTOM: Block = Block::new(137);
+pub const TALL_GRASS_TOP: Block = Block::new(138);
+pub const CRAFTING_TABLE: Block = Block::new(139);
+pub const FURNACE: Block = Block::new(140);
+pub const WHITE_CARPET: Block = Block::new(141);
+pub const BOOKSHELF: Block = Block::new(142);
+pub const OAK_PRESSURE_PLATE: Block = Block::new(143);
+pub const OAK_STAIRS: Block = Block::new(144);
+pub const CHEST: Block = Block::new(155);
+pub const RED_CARPET: Block = Block::new(156);
+pub const ANVIL: Block = Block::new(157);
+pub const NOTE_BLOCK: Block = Block::new(158);
+pub const OAK_DOOR: Block = Block::new(159);
+pub const BREWING_STAND: Block = Block::new(160);
+pub const RED_BED_NORTH_HEAD: Block = Block::new(161);
+pub const RED_BED_NORTH_FOOT: Block = Block::new(162);
+pub const RED_BED_EAST_HEAD: Block = Block::new(163);
+pub const RED_BED_EAST_FOOT: Block = Block::new(164);
+pub const RED_BED_SOUTH_HEAD: Block = Block::new(165);
+pub const RED_BED_SOUTH_FOOT: Block = Block::new(166);
+pub const RED_BED_WEST_HEAD: Block = Block::new(167);
+pub const RED_BED_WEST_FOOT: Block = Block::new(168);
+pub const GRAY_STAINED_GLASS: Block = Block::new(169);
+pub const LIGHT_GRAY_STAINED_GLASS: Block = Block::new(170);
+pub const BROWN_STAINED_GLASS: Block = Block::new(171);
+pub const TINTED_GLASS: Block = Block::new(172);
+pub const OAK_TRAPDOOR: Block = Block::new(173);
+pub const BROWN_CONCRETE: Block = Block::new(174);
+pub const BLACK_TERRACOTTA: Block = Block::new(175);
+pub const BROWN_TERRACOTTA: Block = Block::new(176);
+pub const STONE_BRICK_STAIRS: Block = Block::new(177);
+pub const MUD_BRICK_STAIRS: Block = Block::new(178);
+pub const POLISHED_BLACKSTONE_BRICK_STAIRS: Block = Block::new(179);
+pub const BRICK_STAIRS: Block = Block::new(180);
+pub const POLISHED_GRANITE_STAIRS: Block = Block::new(181);
+pub const END_STONE_BRICK_STAIRS: Block = Block::new(182);
+pub const POLISHED_DIORITE_STAIRS: Block = Block::new(183);
+pub const SMOOTH_SANDSTONE_STAIRS: Block = Block::new(184);
+pub const QUARTZ_STAIRS: Block = Block::new(185);
+pub const POLISHED_ANDESITE_STAIRS: Block = Block::new(186);
+pub const NETHER_BRICK_STAIRS: Block = Block::new(187);
 
-// Variations for building corners
-pub fn building_corner_variations() -> Vec<Block> {
-    vec![
+/// Maps a block to its corresponding stair variant
+#[inline]
+pub fn get_stair_block_for_material(material: Block) -> Block {
+    match material {
+        STONE_BRICKS => STONE_BRICK_STAIRS,
+        MUD_BRICKS => MUD_BRICK_STAIRS,
+        OAK_PLANKS => OAK_STAIRS,
+        POLISHED_ANDESITE => STONE_BRICK_STAIRS,
+        SMOOTH_STONE => POLISHED_ANDESITE_STAIRS,
+        OAK_PLANKS => OAK_STAIRS,
+        ANDESITE => STONE_BRICK_STAIRS,
+        CHISELED_STONE_BRICKS => STONE_BRICK_STAIRS,
+        BLACK_TERRACOTTA => POLISHED_BLACKSTONE_BRICK_STAIRS,
+        BLACKSTONE => POLISHED_BLACKSTONE_BRICK_STAIRS,
+        BLUE_TERRACOTTA => MUD_BRICK_STAIRS,
+        BRICK => BRICK_STAIRS,
+        BROWN_CONCRETE => MUD_BRICK_STAIRS,
+        BROWN_TERRACOTTA => MUD_BRICK_STAIRS,
+        DEEPSLATE_BRICKS => STONE_BRICK_STAIRS,
+        END_STONE_BRICKS => END_STONE_BRICK_STAIRS,
+        GRAY_CONCRETE => POLISHED_BLACKSTONE_BRICK_STAIRS,
+        GRAY_TERRACOTTA => MUD_BRICK_STAIRS,
+        LIGHT_BLUE_TERRACOTTA => STONE_BRICK_STAIRS,
+        LIGHT_GRAY_CONCRETE => STONE_BRICK_STAIRS,
+        NETHER_BRICK => NETHER_BRICK_STAIRS,
+        POLISHED_BLACKSTONE => POLISHED_BLACKSTONE_BRICK_STAIRS,
+        POLISHED_BLACKSTONE_BRICKS => POLISHED_BLACKSTONE_BRICK_STAIRS,
+        POLISHED_DEEPSLATE => STONE_BRICK_STAIRS,
+        POLISHED_GRANITE => POLISHED_GRANITE_STAIRS,
+        QUARTZ_BLOCK => POLISHED_DIORITE_STAIRS,
+        QUARTZ_BRICKS => POLISHED_DIORITE_STAIRS,
+        SANDSTONE => SMOOTH_SANDSTONE_STAIRS,
+        SMOOTH_SANDSTONE => SMOOTH_SANDSTONE_STAIRS,
+        WHITE_CONCRETE => QUARTZ_STAIRS,
+        WHITE_TERRACOTTA => MUD_BRICK_STAIRS,
+        _ => STONE_BRICK_STAIRS,
+    }
+}
+
+// Window variations for different building types
+pub static WINDOW_VARIATIONS: [Block; 7] = [
+    GLASS,
+    GRAY_STAINED_GLASS,
+    LIGHT_GRAY_STAINED_GLASS,
+    GRAY_STAINED_GLASS,
+    BROWN_STAINED_GLASS,
+    WHITE_STAINED_GLASS,
+    TINTED_GLASS,
+];
+
+// Window types for different building styles
+pub fn get_window_block_for_building_type(building_type: &str) -> Block {
+    use rand::Rng;
+    let mut rng = rand::thread_rng();
+
+    match building_type {
+        "residential" | "house" | "apartment" => {
+            let residential_windows = [
+                GLASS,
+                WHITE_STAINED_GLASS,
+                LIGHT_GRAY_STAINED_GLASS,
+                BROWN_STAINED_GLASS,
+            ];
+            residential_windows[rng.gen_range(0..residential_windows.len())]
+        }
+        "hospital" | "school" | "university" => {
+            let institutional_windows = [GLASS, WHITE_STAINED_GLASS, LIGHT_GRAY_STAINED_GLASS];
+            institutional_windows[rng.gen_range(0..institutional_windows.len())]
+        }
+        "hotel" | "restaurant" => {
+            let hospitality_windows = [GLASS, WHITE_STAINED_GLASS];
+            hospitality_windows[rng.gen_range(0..hospitality_windows.len())]
+        }
+        "industrial" | "warehouse" => {
+            let industrial_windows = [
+                GLASS,
+                GRAY_STAINED_GLASS,
+                LIGHT_GRAY_STAINED_GLASS,
+                BROWN_STAINED_GLASS,
+            ];
+            industrial_windows[rng.gen_range(0..industrial_windows.len())]
+        }
+        _ => WINDOW_VARIATIONS[rng.gen_range(0..WINDOW_VARIATIONS.len())],
+    }
+}
+
+// Random floor block selection
+pub fn get_random_floor_block() -> Block {
+    use rand::Rng;
+    let mut rng = rand::thread_rng();
+
+    let floor_options = [
+        WHITE_CONCRETE,
+        GRAY_CONCRETE,
+        LIGHT_GRAY_CONCRETE,
+        POLISHED_ANDESITE,
+        SMOOTH_STONE,
         STONE_BRICKS,
-        COBBLESTONE,
-        BRICK,
-        MOSSY_COBBLESTONE,
-        SANDSTONE,
-        RED_NETHER_BRICKS,
+        MUD_BRICKS,
+        OAK_PLANKS,
+    ];
+    floor_options[rng.gen_range(0..floor_options.len())]
+}
+
+// Define all predefined colors with their blocks
+static DEFINED_COLORS: &[ColorBlockMapping] = &[
+    ((233, 107, 57), &[BRICK, NETHER_BRICK]),
+    (
+        (18, 12, 13),
+        &[POLISHED_BLACKSTONE_BRICKS, BLACKSTONE, DEEPSLATE_BRICKS],
+    ),
+    ((76, 127, 153), &[LIGHT_BLUE_TERRACOTTA]),
+    (
+        (0, 0, 0),
+        &[DEEPSLATE_BRICKS, BLACKSTONE, POLISHED_BLACKSTONE],
+    ),
+    (
+        (186, 195, 142),
+        &[
+            END_STONE_BRICKS,
+            SANDSTONE,
+            SMOOTH_SANDSTONE,
+            LIGHT_GRAY_CONCRETE,
+        ],
+    ),
+    (
+        (57, 41, 35),
+        &[BROWN_TERRACOTTA, BROWN_CONCRETE, MUD_BRICKS, BRICK],
+    ),
+    (
+        (112, 108, 138),
+        &[LIGHT_BLUE_TERRACOTTA, GRAY_TERRACOTTA, GRAY_CONCRETE],
+    ),
+    (
+        (122, 92, 66),
+        &[MUD_BRICKS, BROWN_TERRACOTTA, SANDSTONE, BRICK],
+    ),
+    ((24, 13, 14), &[NETHER_BRICK, BLACKSTONE, DEEPSLATE_BRICKS]),
+    (
+        (159, 82, 36),
+        &[
+            BROWN_TERRACOTTA,
+            BRICK,
+            POLISHED_GRANITE,
+            BROWN_CONCRETE,
+            NETHERITE_BLOCK,
+            POLISHED_DEEPSLATE,
+        ],
+    ),
+    (
+        (128, 128, 128),
+        &[
+            POLISHED_ANDESITE,
+            LIGHT_GRAY_CONCRETE,
+            SMOOTH_STONE,
+            STONE_BRICKS,
+        ],
+    ),
+    (
+        (174, 173, 174),
+        &[
+            POLISHED_ANDESITE,
+            LIGHT_GRAY_CONCRETE,
+            SMOOTH_STONE,
+            STONE_BRICKS,
+        ],
+    ),
+    ((141, 101, 142), &[STONE_BRICKS, BRICK, MUD_BRICKS]),
+    (
+        (142, 60, 46),
+        &[
+            BLACK_TERRACOTTA,
+            NETHERITE_BLOCK,
+            NETHER_BRICK,
+            POLISHED_GRANITE,
+            POLISHED_DEEPSLATE,
+            BROWN_TERRACOTTA,
+        ],
+    ),
+    (
+        (153, 83, 28),
+        &[
+            BLACK_TERRACOTTA,
+            POLISHED_GRANITE,
+            BROWN_CONCRETE,
+            BROWN_TERRACOTTA,
+            STONE_BRICKS,
+        ],
+    ),
+    (
+        (224, 216, 175),
+        &[
+            SMOOTH_SANDSTONE,
+            LIGHT_GRAY_CONCRETE,
+            POLISHED_ANDESITE,
+            SMOOTH_STONE,
+        ],
+    ),
+    (
+        (188, 182, 179),
+        &[
+            SMOOTH_SANDSTONE,
+            LIGHT_GRAY_CONCRETE,
+            QUARTZ_BRICKS,
+            POLISHED_ANDESITE,
+            SMOOTH_STONE,
+        ],
+    ),
+    (
+        (35, 86, 85),
+        &[
+            POLISHED_BLACKSTONE_BRICKS,
+            BLUE_TERRACOTTA,
+            LIGHT_BLUE_TERRACOTTA,
+        ],
+    ),
+    (
+        (255, 255, 255),
+        &[WHITE_CONCRETE, QUARTZ_BRICKS, QUARTZ_BLOCK],
+    ),
+    (
+        (209, 177, 161),
+        &[
+            WHITE_TERRACOTTA,
+            SMOOTH_SANDSTONE,
+            SMOOTH_STONE,
+            SANDSTONE,
+            LIGHT_GRAY_CONCRETE,
+        ],
+    ),
+    ((191, 147, 42), &[SMOOTH_SANDSTONE, SANDSTONE, SMOOTH_STONE]),
+];
+
+// Function to randomly select building wall block with alternatives
+pub fn get_building_wall_block_for_color(color: RGBTuple) -> Block {
+    use rand::Rng;
+    let mut rng = rand::thread_rng();
+
+    // Find the closest color match
+    let closest_color = DEFINED_COLORS
+        .iter()
+        .min_by_key(|(defined_color, _)| crate::colors::rgb_distance(&color, defined_color));
+
+    if let Some((_, options)) = closest_color {
+        options[rng.gen_range(0..options.len())]
+    } else {
+        // This should never happen, but fallback just in case
+        get_fallback_building_block()
+    }
+}
+
+// Function to get a random fallback building block when no color attribute is specified
+pub fn get_fallback_building_block() -> Block {
+    use rand::Rng;
+    let mut rng = rand::thread_rng();
+
+    let fallback_options = [
         BLACKSTONE,
-        SMOOTH_QUARTZ,
-        CHISELED_STONE_BRICKS,
-        POLISHED_BASALT,
-        CUT_SANDSTONE,
-        POLISHED_BLACKSTONE_BRICKS,
-        ANDESITE,
-        GRANITE,
-        DIORITE,
-        CRACKED_STONE_BRICKS,
-        PRISMARINE,
-        BLUE_TERRACOTTA,
+        BLACK_TERRACOTTA,
+        BRICK,
+        BROWN_CONCRETE,
+        BROWN_TERRACOTTA,
+        DEEPSLATE_BRICKS,
+        END_STONE_BRICKS,
+        GRAY_CONCRETE,
+        GRAY_TERRACOTTA,
+        LIGHT_BLUE_TERRACOTTA,
+        LIGHT_GRAY_CONCRETE,
+        MUD_BRICKS,
         NETHER_BRICK,
+        POLISHED_ANDESITE,
+        POLISHED_BLACKSTONE,
+        POLISHED_BLACKSTONE_BRICKS,
+        POLISHED_DEEPSLATE,
+        POLISHED_GRANITE,
+        QUARTZ_BLOCK,
         QUARTZ_BRICKS,
-    ]
+        SANDSTONE,
+        SMOOTH_SANDSTONE,
+        SMOOTH_STONE,
+        STONE_BRICKS,
+        WHITE_CONCRETE,
+        WHITE_TERRACOTTA,
+        OAK_PLANKS,
+    ];
+    fallback_options[rng.gen_range(0..fallback_options.len())]
 }
 
-// Variations for building walls
-pub fn building_wall_variations() -> Vec<Block> {
-    building_wall_color_map()
-        .into_iter()
-        .map(|(_, block)| block)
-        .collect()
-}
+// Function to get a random castle wall block
+pub fn get_castle_wall_block() -> Block {
+    use rand::Rng;
+    let mut rng = rand::thread_rng();
 
-// https://wiki.openstreetmap.org/wiki/Key:building:colour
-pub fn building_wall_color_map() -> Vec<(RGBTuple, Block)> {
-    vec![
-        ((233, 107, 57), BRICK),
-        ((18, 12, 13), CRACKED_POLISHED_BLACKSTONE_BRICKS),
-        ((76, 127, 153), CYAN_CONCRETE),
-        ((0, 0, 0), DEEPSLATE_BRICKS),
-        ((186, 195, 142), END_STONE_BRICKS),
-        ((57, 41, 35), GRAY_TERRACOTTA),
-        ((112, 108, 138), LIGHT_BLUE_TERRACOTTA),
-        ((122, 92, 66), MUD_BRICKS),
-        ((24, 13, 14), NETHER_BRICKS),
-        ((159, 82, 36), ORANGE_TERRACOTTA),
-        ((128, 128, 128), POLISHED_ANDESITE),
-        ((174, 173, 174), POLISHED_DIORITE),
-        ((141, 101, 142), PURPUR_PILLAR),
-        ((142, 60, 46), RED_TERRACOTTA),
-        ((153, 83, 28), SMOOTH_RED_SANDSTONE),
-        ((224, 216, 175), SMOOTH_SANDSTONE),
-        ((188, 182, 179), SMOOTH_STONE),
-        ((35, 86, 85), WARPED_PLANKS),
-        ((255, 255, 255), WHITE_CONCRETE),
-        ((209, 177, 161), WHITE_TERRACOTTA),
-        ((191, 147, 42), YELLOW_TERRACOTTA),
-    ]
-}
-
-// Variations for building floors
-pub fn building_floor_variations() -> Vec<Block> {
-    building_wall_color_map()
-        .into_iter()
-        .map(|(_, block)| block)
-        .collect()
-}
-
-pub fn building_floor_color_map() -> Vec<(RGBTuple, Block)> {
-    vec![
-        ((181, 101, 59), ACACIA_PLANKS),
-        ((22, 15, 16), BLACKSTONE),
-        ((104, 51, 74), CRIMSON_PLANKS),
-        ((82, 55, 26), DARK_OAK_PLANKS),
-        ((182, 133, 99), JUNGLE_PLANKS),
-        ((33, 128, 185), LIGHT_BLUE_CONCRETE),
-        ((78, 103, 43), MOSS_BLOCK),
-        ((171, 138, 88), OAK_PLANKS),
-        ((0, 128, 0), OXIDIZED_COPPER),
-        ((18, 12, 13), POLISHED_BLACKSTONE),
-        ((64, 64, 64), POLISHED_DEEPSLATE),
-        ((255, 255, 255), POLISHED_DIORITE),
-        ((143, 96, 79), POLISHED_GRANITE),
-        ((141, 101, 142), PURPUR_BLOCK),
-        ((128, 0, 0), RED_NETHER_BRICKS),
-        ((153, 83, 28), SMOOTH_RED_SANDSTONE),
-        ((128, 96, 57), SPRUCE_PLANKS),
-        ((128, 128, 128), STONE_BRICKS),
-        ((150, 93, 68), TERRACOTTA),
-        ((35, 86, 85), WARPED_PLANKS),
-    ]
+    let castle_wall_options = [
+        STONE_BRICKS,
+        CHISELED_STONE_BRICKS,
+        CRACKED_STONE_BRICKS,
+        COBBLESTONE,
+        MOSSY_COBBLESTONE,
+        DEEPSLATE_BRICKS,
+        POLISHED_ANDESITE,
+        ANDESITE,
+        SMOOTH_STONE,
+        BRICK,
+    ];
+    castle_wall_options[rng.gen_range(0..castle_wall_options.len())]
 }

src/cartesian.rs

@@ -1,12 +0,0 @@
-#[derive(Copy, Clone)]
-pub struct XZPoint {
-    pub x: i32,
-    pub z: i32,
-}
-
-impl XZPoint {
-    #[inline]
-    pub fn new(x: i32, z: i32) -> Self {
-        Self { x, z }
-    }
-}

src/clipping.rs

@@ -0,0 +1,706 @@
+// Sutherland-Hodgman polygon clipping and related geometry utilities.
+//
+// Provides bbox clipping for polygons, polylines, and water rings with
+// proper corner insertion for closed shapes.
+
+use crate::coordinate_system::cartesian::{XZBBox, XZPoint};
+use crate::osm_parser::ProcessedNode;
+use std::collections::HashMap;
+
+/// Clips a way to the bounding box using Sutherland-Hodgman for polygons or
+/// simple line clipping for polylines. Preserves endpoint IDs for ring assembly.
+pub fn clip_way_to_bbox(nodes: &[ProcessedNode], xzbbox: &XZBBox) -> Vec<ProcessedNode> {
+    if nodes.is_empty() {
+        return Vec::new();
+    }
+
+    let is_closed = is_closed_polygon(nodes);
+
+    if !is_closed {
+        return clip_polyline_to_bbox(nodes, xzbbox);
+    }
+
+    // If all nodes are inside the bbox, return unchanged
+    let has_nodes_outside = nodes
+        .iter()
+        .any(|node| !xzbbox.contains(&XZPoint::new(node.x, node.z)));
+
+    if !has_nodes_outside {
+        return nodes.to_vec();
+    }
+
+    let min_x = xzbbox.min_x() as f64;
+    let min_z = xzbbox.min_z() as f64;
+    let max_x = xzbbox.max_x() as f64;
+    let max_z = xzbbox.max_z() as f64;
+
+    let mut polygon: Vec<(f64, f64)> = nodes.iter().map(|n| (n.x as f64, n.z as f64)).collect();
+
+    polygon = clip_polygon_sutherland_hodgman(polygon, min_x, min_z, max_x, max_z);
+
+    if polygon.len() < 3 {
+        return Vec::new();
+    }
+
+    // Final clamping for floating-point errors
+    for p in &mut polygon {
+        p.0 = p.0.clamp(min_x, max_x);
+        p.1 = p.1.clamp(min_z, max_z);
+    }
+
+    let polygon = remove_consecutive_duplicates(polygon);
+    if polygon.len() < 3 {
+        return Vec::new();
+    }
+
+    let polygon = insert_bbox_corners(polygon, min_x, min_z, max_x, max_z);
+    let polygon = remove_consecutive_duplicates(polygon);
+    if polygon.len() < 3 {
+        return Vec::new();
+    }
+
+    let way_id = nodes.first().map(|n| n.id).unwrap_or(0);
+    assign_node_ids_preserving_endpoints(nodes, polygon, way_id)
+}
+
+/// Clips a water polygon ring to bbox using Sutherland-Hodgman (post-ring-merge).
+pub fn clip_water_ring_to_bbox(
+    ring: &[ProcessedNode],
+    xzbbox: &XZBBox,
+) -> Option<Vec<ProcessedNode>> {
+    if ring.is_empty() {
+        return None;
+    }
+
+    let min_x = xzbbox.min_x() as f64;
+    let min_z = xzbbox.min_z() as f64;
+    let max_x = xzbbox.max_x() as f64;
+    let max_z = xzbbox.max_z() as f64;
+
+    // Check if entire ring is inside bbox
+    let all_inside = ring.iter().all(|n| {
+        n.x as f64 >= min_x && n.x as f64 <= max_x && n.z as f64 >= min_z && n.z as f64 <= max_z
+    });
+
+    if all_inside {
+        return Some(ring.to_vec());
+    }
+
+    // Check if entire ring is outside bbox
+    if is_ring_outside_bbox(ring, min_x, min_z, max_x, max_z) {
+        return None;
+    }
+
+    // Convert to f64 coordinates and ensure closed
+    let mut polygon: Vec<(f64, f64)> = ring.iter().map(|n| (n.x as f64, n.z as f64)).collect();
+    if !polygon.is_empty() && polygon.first() != polygon.last() {
+        polygon.push(polygon[0]);
+    }
+
+    // Clip with full-range clamping (water uses simpler approach)
+    polygon = clip_polygon_sutherland_hodgman_simple(polygon, min_x, min_z, max_x, max_z);
+
+    if polygon.len() < 3 {
+        return None;
+    }
+
+    // Verify all points are within bbox
+    let all_points_inside = polygon
+        .iter()
+        .all(|&(x, z)| x >= min_x && x <= max_x && z >= min_z && z <= max_z);
+
+    if !all_points_inside {
+        eprintln!("ERROR: clip_water_ring_to_bbox produced points outside bbox!");
+        return None;
+    }
+
+    let polygon = insert_bbox_corners(polygon, min_x, min_z, max_x, max_z);
+    if polygon.len() < 3 {
+        return None;
+    }
+
+    // Convert back to ProcessedNode with synthetic IDs
+    let mut result: Vec<ProcessedNode> = polygon
+        .iter()
+        .enumerate()
+        .map(|(i, &(x, z))| ProcessedNode {
+            id: 1_000_000_000 + i as u64,
+            tags: HashMap::new(),
+            x: x.clamp(min_x, max_x).round() as i32,
+            z: z.clamp(min_z, max_z).round() as i32,
+        })
+        .collect();
+
+    // Close the loop by matching first and last ID
+    if !result.is_empty() {
+        let first_id = result[0].id;
+        result.last_mut().unwrap().id = first_id;
+    }
+
+    Some(result)
+}
+
+// ============================================================================
+// Internal helpers
+// ============================================================================
+
+/// Checks if a way forms a closed polygon.
+fn is_closed_polygon(nodes: &[ProcessedNode]) -> bool {
+    if nodes.len() < 3 {
+        return false;
+    }
+    let first = nodes.first().unwrap();
+    let last = nodes.last().unwrap();
+    first.id == last.id || (first.x == last.x && first.z == last.z)
+}
+
+/// Checks if an entire ring is outside the bbox.
+fn is_ring_outside_bbox(
+    ring: &[ProcessedNode],
+    min_x: f64,
+    min_z: f64,
+    max_x: f64,
+    max_z: f64,
+) -> bool {
+    let all_left = ring.iter().all(|n| (n.x as f64) < min_x);
+    let all_right = ring.iter().all(|n| (n.x as f64) > max_x);
+    let all_top = ring.iter().all(|n| (n.z as f64) < min_z);
+    let all_bottom = ring.iter().all(|n| (n.z as f64) > max_z);
+    all_left || all_right || all_top || all_bottom
+}
+
+/// Clips a polyline (open path) to the bounding box.
+fn clip_polyline_to_bbox(nodes: &[ProcessedNode], xzbbox: &XZBBox) -> Vec<ProcessedNode> {
+    if nodes.is_empty() {
+        return Vec::new();
+    }
+
+    let min_x = xzbbox.min_x() as f64;
+    let min_z = xzbbox.min_z() as f64;
+    let max_x = xzbbox.max_x() as f64;
+    let max_z = xzbbox.max_z() as f64;
+
+    let mut result = Vec::new();
+
+    for i in 0..nodes.len() {
+        let current = &nodes[i];
+        let current_point = (current.x as f64, current.z as f64);
+        let current_inside = point_in_bbox(current_point, min_x, min_z, max_x, max_z);
+
+        if current_inside {
+            result.push(current.clone());
+        }
+
+        if i + 1 < nodes.len() {
+            let next = &nodes[i + 1];
+            let next_point = (next.x as f64, next.z as f64);
+            let next_inside = point_in_bbox(next_point, min_x, min_z, max_x, max_z);
+
+            if current_inside != next_inside {
+                // One endpoint inside, one outside, find single intersection
+                let intersections =
+                    find_bbox_intersections(current_point, next_point, min_x, min_z, max_x, max_z);
+
+                for intersection in intersections {
+                    let synthetic_id = nodes[0]
+                        .id
+                        .wrapping_mul(10000000)
+                        .wrapping_add(result.len() as u64);
+                    result.push(ProcessedNode {
+                        id: synthetic_id,
+                        x: intersection.0.round() as i32,
+                        z: intersection.1.round() as i32,
+                        tags: HashMap::new(),
+                    });
+                }
+            } else if !current_inside && !next_inside {
+                // Both endpoints outside, segment might still cross through bbox
+                let mut intersections =
+                    find_bbox_intersections(current_point, next_point, min_x, min_z, max_x, max_z);
+
+                if intersections.len() >= 2 {
+                    // Sort intersections by distance from current point
+                    intersections.sort_by(|a, b| {
+                        let dist_a =
+                            (a.0 - current_point.0).powi(2) + (a.1 - current_point.1).powi(2);
+                        let dist_b =
+                            (b.0 - current_point.0).powi(2) + (b.1 - current_point.1).powi(2);
+                        dist_a
+                            .partial_cmp(&dist_b)
+                            .unwrap_or(std::cmp::Ordering::Equal)
+                    });
+
+                    for intersection in intersections {
+                        let synthetic_id = nodes[0]
+                            .id
+                            .wrapping_mul(10000000)
+                            .wrapping_add(result.len() as u64);
+                        result.push(ProcessedNode {
+                            id: synthetic_id,
+                            x: intersection.0.round() as i32,
+                            z: intersection.1.round() as i32,
+                            tags: HashMap::new(),
+                        });
+                    }
+                }
+            }
+        }
+    }
+
+    // Preserve endpoint IDs where possible
+    if result.len() >= 2 {
+        let tolerance = 50.0;
+        if let Some(first_orig) = nodes.first() {
+            if matches_endpoint(
+                (result[0].x as f64, result[0].z as f64),
+                first_orig,
+                tolerance,
+            ) {
+                result[0].id = first_orig.id;
+            }
+        }
+        if let Some(last_orig) = nodes.last() {
+            let last_idx = result.len() - 1;
+            if matches_endpoint(
+                (result[last_idx].x as f64, result[last_idx].z as f64),
+                last_orig,
+                tolerance,
+            ) {
+                result[last_idx].id = last_orig.id;
+            }
+        }
+    }
+
+    result
+}
+
+/// Sutherland-Hodgman polygon clipping with edge-specific clamping.
+fn clip_polygon_sutherland_hodgman(
+    mut polygon: Vec<(f64, f64)>,
+    min_x: f64,
+    min_z: f64,
+    max_x: f64,
+    max_z: f64,
+) -> Vec<(f64, f64)> {
+    // Edges: bottom, right, top, left (counter-clockwise traversal)
+    let bbox_edges = [
+        (min_x, min_z, max_x, min_z, 0), // Bottom: clamp z
+        (max_x, min_z, max_x, max_z, 1), // Right: clamp x
+        (max_x, max_z, min_x, max_z, 2), // Top: clamp z
+        (min_x, max_z, min_x, min_z, 3), // Left: clamp x
+    ];
+
+    for (edge_x1, edge_z1, edge_x2, edge_z2, edge_idx) in bbox_edges {
+        if polygon.is_empty() {
+            break;
+        }
+
+        let mut clipped = Vec::new();
+        let is_closed = !polygon.is_empty() && polygon.first() == polygon.last();
+        let edge_count = if is_closed {
+            polygon.len().saturating_sub(1)
+        } else {
+            polygon.len()
+        };
+
+        for i in 0..edge_count {
+            let current = polygon[i];
+            let next = polygon.get(i + 1).copied().unwrap_or(polygon[0]);
+
+            let current_inside = point_inside_edge(current, edge_x1, edge_z1, edge_x2, edge_z2);
+            let next_inside = point_inside_edge(next, edge_x1, edge_z1, edge_x2, edge_z2);
+
+            if next_inside {
+                if !current_inside {
+                    if let Some(mut intersection) = line_edge_intersection(
+                        current.0, current.1, next.0, next.1, edge_x1, edge_z1, edge_x2, edge_z2,
+                    ) {
+                        // Clamp to current edge only
+                        match edge_idx {
+                            0 => intersection.1 = min_z,
+                            1 => intersection.0 = max_x,
+                            2 => intersection.1 = max_z,
+                            3 => intersection.0 = min_x,
+                            _ => {}
+                        }
+                        clipped.push(intersection);
+                    }
+                }
+                clipped.push(next);
+            } else if current_inside {
+                if let Some(mut intersection) = line_edge_intersection(
+                    current.0, current.1, next.0, next.1, edge_x1, edge_z1, edge_x2, edge_z2,
+                ) {
+                    match edge_idx {
+                        0 => intersection.1 = min_z,
+                        1 => intersection.0 = max_x,
+                        2 => intersection.1 = max_z,
+                        3 => intersection.0 = min_x,
+                        _ => {}
+                    }
+                    clipped.push(intersection);
+                }
+            }
+        }
+
+        polygon = clipped;
+    }
+
+    polygon
+}
+
+/// Sutherland-Hodgman with full bbox clamping (simpler, for water rings).
+fn clip_polygon_sutherland_hodgman_simple(
+    mut polygon: Vec<(f64, f64)>,
+    min_x: f64,
+    min_z: f64,
+    max_x: f64,
+    max_z: f64,
+) -> Vec<(f64, f64)> {
+    let bbox_edges = [
+        (min_x, min_z, max_x, min_z),
+        (max_x, min_z, max_x, max_z),
+        (max_x, max_z, min_x, max_z),
+        (min_x, max_z, min_x, min_z),
+    ];
+
+    for (edge_x1, edge_z1, edge_x2, edge_z2) in bbox_edges {
+        if polygon.is_empty() {
+            break;
+        }
+
+        let mut clipped = Vec::new();
+
+        for i in 0..(polygon.len().saturating_sub(1)) {
+            let current = polygon[i];
+            let next = polygon[i + 1];
+
+            let current_inside = point_inside_edge(current, edge_x1, edge_z1, edge_x2, edge_z2);
+            let next_inside = point_inside_edge(next, edge_x1, edge_z1, edge_x2, edge_z2);
+
+            if next_inside {
+                if !current_inside {
+                    if let Some(mut intersection) = line_edge_intersection(
+                        current.0, current.1, next.0, next.1, edge_x1, edge_z1, edge_x2, edge_z2,
+                    ) {
+                        intersection.0 = intersection.0.clamp(min_x, max_x);
+                        intersection.1 = intersection.1.clamp(min_z, max_z);
+                        clipped.push(intersection);
+                    }
+                }
+                clipped.push(next);
+            } else if current_inside {
+                if let Some(mut intersection) = line_edge_intersection(
+                    current.0, current.1, next.0, next.1, edge_x1, edge_z1, edge_x2, edge_z2,
+                ) {
+                    intersection.0 = intersection.0.clamp(min_x, max_x);
+                    intersection.1 = intersection.1.clamp(min_z, max_z);
+                    clipped.push(intersection);
+                }
+            }
+        }
+
+        polygon = clipped;
+    }
+
+    polygon
+}
+
+/// Checks if point is inside bbox.
+fn point_in_bbox(point: (f64, f64), min_x: f64, min_z: f64, max_x: f64, max_z: f64) -> bool {
+    point.0 >= min_x && point.0 <= max_x && point.1 >= min_z && point.1 <= max_z
+}
+
+/// Checks if point is on the "inside" side of an edge (cross product test).
+fn point_inside_edge(
+    point: (f64, f64),
+    edge_x1: f64,
+    edge_z1: f64,
+    edge_x2: f64,
+    edge_z2: f64,
+) -> bool {
+    let edge_dx = edge_x2 - edge_x1;
+    let edge_dz = edge_z2 - edge_z1;
+    let point_dx = point.0 - edge_x1;
+    let point_dz = point.1 - edge_z1;
+    (edge_dx * point_dz - edge_dz * point_dx) >= 0.0
+}
+
+/// Finds intersection between a line segment and an edge.
+#[allow(clippy::too_many_arguments)]
+fn line_edge_intersection(
+    line_x1: f64,
+    line_z1: f64,
+    line_x2: f64,
+    line_z2: f64,
+    edge_x1: f64,
+    edge_z1: f64,
+    edge_x2: f64,
+    edge_z2: f64,
+) -> Option<(f64, f64)> {
+    let line_dx = line_x2 - line_x1;
+    let line_dz = line_z2 - line_z1;
+    let edge_dx = edge_x2 - edge_x1;
+    let edge_dz = edge_z2 - edge_z1;
+
+    let denom = line_dx * edge_dz - line_dz * edge_dx;
+    if denom.abs() < 1e-10 {
+        return None;
+    }
+
+    let dx = edge_x1 - line_x1;
+    let dz = edge_z1 - line_z1;
+    let t = (dx * edge_dz - dz * edge_dx) / denom;
+
+    if (0.0..=1.0).contains(&t) {
+        Some((line_x1 + t * line_dx, line_z1 + t * line_dz))
+    } else {
+        None
+    }
+}
+
+/// Finds intersections between a line segment and bbox edges.
+fn find_bbox_intersections(
+    start: (f64, f64),
+    end: (f64, f64),
+    min_x: f64,
+    min_z: f64,
+    max_x: f64,
+    max_z: f64,
+) -> Vec<(f64, f64)> {
+    let mut intersections = Vec::new();
+
+    let bbox_edges = [
+        (min_x, min_z, max_x, min_z),
+        (max_x, min_z, max_x, max_z),
+        (max_x, max_z, min_x, max_z),
+        (min_x, max_z, min_x, min_z),
+    ];
+
+    for (edge_x1, edge_z1, edge_x2, edge_z2) in bbox_edges {
+        if let Some(intersection) = line_edge_intersection(
+            start.0, start.1, end.0, end.1, edge_x1, edge_z1, edge_x2, edge_z2,
+        ) {
+            let on_edge = point_in_bbox(intersection, min_x, min_z, max_x, max_z)
+                && ((intersection.0 == min_x || intersection.0 == max_x)
+                    || (intersection.1 == min_z || intersection.1 == max_z));
+
+            if on_edge {
+                intersections.push(intersection);
+            }
+        }
+    }
+
+    intersections
+}
+
+/// Returns which bbox edge a point lies on: 0=bottom, 1=right, 2=top, 3=left, -1=interior.
+fn get_bbox_edge(point: (f64, f64), min_x: f64, min_z: f64, max_x: f64, max_z: f64) -> i32 {
+    let eps = 0.5;
+
+    let on_left = (point.0 - min_x).abs() < eps;
+    let on_right = (point.0 - max_x).abs() < eps;
+    let on_bottom = (point.1 - min_z).abs() < eps;
+    let on_top = (point.1 - max_z).abs() < eps;
+
+    // Handle corners (assign to edge in counter-clockwise order)
+    if on_bottom && on_left {
+        return 3;
+    }
+    if on_bottom && on_right {
+        return 0;
+    }
+    if on_top && on_right {
+        return 1;
+    }
+    if on_top && on_left {
+        return 2;
+    }
+
+    if on_bottom {
+        return 0;
+    }
+    if on_right {
+        return 1;
+    }
+    if on_top {
+        return 2;
+    }
+    if on_left {
+        return 3;
+    }
+
+    -1
+}
+
+/// Returns corners to insert when traversing from edge1 to edge2 via shorter path.
+fn get_corners_between_edges(
+    edge1: i32,
+    edge2: i32,
+    min_x: f64,
+    min_z: f64,
+    max_x: f64,
+    max_z: f64,
+) -> Vec<(f64, f64)> {
+    if edge1 == edge2 || edge1 < 0 || edge2 < 0 {
+        return Vec::new();
+    }
+
+    let corners = [
+        (max_x, min_z), // 0: bottom-right
+        (max_x, max_z), // 1: top-right
+        (min_x, max_z), // 2: top-left
+        (min_x, min_z), // 3: bottom-left
+    ];
+
+    let ccw_dist = ((edge2 - edge1 + 4) % 4) as usize;
+    let cw_dist = ((edge1 - edge2 + 4) % 4) as usize;
+
+    // Opposite edges: don't insert corners
+    if ccw_dist == 2 && cw_dist == 2 {
+        return Vec::new();
+    }
+
+    let mut result = Vec::new();
+
+    if ccw_dist <= cw_dist {
+        let mut current = edge1;
+        for _ in 0..ccw_dist {
+            result.push(corners[current as usize]);
+            current = (current + 1) % 4;
+        }
+    } else {
+        let mut current = edge1;
+        for _ in 0..cw_dist {
+            current = (current + 4 - 1) % 4;
+            result.push(corners[current as usize]);
+        }
+    }
+
+    result
+}
+
+/// Inserts bbox corners where polygon transitions between different bbox edges.
+fn insert_bbox_corners(
+    polygon: Vec<(f64, f64)>,
+    min_x: f64,
+    min_z: f64,
+    max_x: f64,
+    max_z: f64,
+) -> Vec<(f64, f64)> {
+    if polygon.len() < 3 {
+        return polygon;
+    }
+
+    let mut result = Vec::with_capacity(polygon.len() + 4);
+
+    for i in 0..polygon.len() {
+        let current = polygon[i];
+        let next = polygon[(i + 1) % polygon.len()];
+
+        result.push(current);
+
+        let edge1 = get_bbox_edge(current, min_x, min_z, max_x, max_z);
+        let edge2 = get_bbox_edge(next, min_x, min_z, max_x, max_z);
+
+        if edge1 >= 0 && edge2 >= 0 && edge1 != edge2 {
+            for corner in get_corners_between_edges(edge1, edge2, min_x, min_z, max_x, max_z) {
+                result.push(corner);
+            }
+        }
+    }
+
+    result
+}
+
+/// Removes consecutive duplicate points (within epsilon tolerance).
+fn remove_consecutive_duplicates(polygon: Vec<(f64, f64)>) -> Vec<(f64, f64)> {
+    if polygon.is_empty() {
+        return polygon;
+    }
+
+    let eps = 0.1;
+    let mut result: Vec<(f64, f64)> = Vec::with_capacity(polygon.len());
+
+    for p in &polygon {
+        if let Some(last) = result.last() {
+            if (p.0 - last.0).abs() < eps && (p.1 - last.1).abs() < eps {
+                continue;
+            }
+        }
+        result.push(*p);
+    }
+
+    // Check first/last duplicates for closed polygons
+    if result.len() > 1 {
+        let first = result.first().unwrap();
+        let last = result.last().unwrap();
+        if (first.0 - last.0).abs() < eps && (first.1 - last.1).abs() < eps {
+            result.pop();
+        }
+    }
+
+    result
+}
+
+/// Checks if a clipped coordinate matches an original endpoint.
+fn matches_endpoint(coord: (f64, f64), endpoint: &ProcessedNode, tolerance: f64) -> bool {
+    let dx = (coord.0 - endpoint.x as f64).abs();
+    let dz = (coord.1 - endpoint.z as f64).abs();
+    dx * dx + dz * dz < tolerance * tolerance
+}
+
+/// Assigns node IDs to clipped coordinates, preserving original endpoint IDs.
+fn assign_node_ids_preserving_endpoints(
+    original_nodes: &[ProcessedNode],
+    clipped_coords: Vec<(f64, f64)>,
+    way_id: u64,
+) -> Vec<ProcessedNode> {
+    if clipped_coords.is_empty() {
+        return Vec::new();
+    }
+
+    let original_first = original_nodes.first();
+    let original_last = original_nodes.last();
+    let tolerance = 50.0;
+    let last_index = clipped_coords.len() - 1;
+
+    clipped_coords
+        .into_iter()
+        .enumerate()
+        .map(|(i, coord)| {
+            let is_first = i == 0;
+            let is_last = i == last_index;
+
+            if is_first || is_last {
+                if let Some(first) = original_first {
+                    if matches_endpoint(coord, first, tolerance) {
+                        return ProcessedNode {
+                            id: first.id,
+                            x: coord.0.round() as i32,
+                            z: coord.1.round() as i32,
+                            tags: HashMap::new(),
+                        };
+                    }
+                }
+                if let Some(last) = original_last {
+                    if matches_endpoint(coord, last, tolerance) {
+                        return ProcessedNode {
+                            id: last.id,
+                            x: coord.0.round() as i32,
+                            z: coord.1.round() as i32,
+                            tags: HashMap::new(),
+                        };
+                    }
+                }
+            }
+
+            ProcessedNode {
+                id: way_id.wrapping_mul(10000000).wrapping_add(i as u64),
+                x: coord.0.round() as i32,
+                z: coord.1.round() as i32,
+                tags: HashMap::new(),
+            }
+        })
+        .collect()
+}

src/colors.rs

@@ -32,16 +32,16 @@ fn full_hex_color_to_rgb_tuple(text: &str) -> Option<RGBTuple> {
 fn short_hex_color_to_rgb_tuple(text: &str) -> Option<RGBTuple> {
     if text.len() != 4
         || !text.starts_with("#")
-        || text.chars().skip(1).all(|c: char| c.is_ascii_hexdigit())
+        || !text.chars().skip(1).all(|c: char| c.is_ascii_hexdigit())
     {
         return None;
     }
     let r: u8 = u8::from_str_radix(&text[1..2], 16).unwrap();
-    let r: u8 = r | r << 4;
+    let r: u8 = r | (r << 4);
     let g: u8 = u8::from_str_radix(&text[2..3], 16).unwrap();
-    let g: u8 = g | g << 4;
+    let g: u8 = g | (g << 4);
     let b: u8 = u8::from_str_radix(&text[3..4], 16).unwrap();
-    let b: u8 = b | b << 4;
+    let b: u8 = b | (b << 4);
     Some((r, g, b))
 }
 

src/coordinate_system/cartesian/mod.rs

@@ -0,0 +1,7 @@
+mod xzbbox;
+mod xzpoint;
+mod xzvector;
+
+pub use xzbbox::XZBBox;
+pub use xzpoint::XZPoint;
+pub use xzvector::XZVector;

src/coordinate_system/cartesian/xzbbox/mod.rs

@@ -0,0 +1,4 @@
+mod rectangle;
+mod xzbbox_enum;
+
+pub use xzbbox_enum::XZBBox;

src/coordinate_system/cartesian/xzbbox/rectangle.rs

@@ -0,0 +1,112 @@
+use crate::coordinate_system::cartesian::{XZPoint, XZVector};
+use std::fmt;
+use std::ops::{Add, AddAssign, Sub, SubAssign};
+
+/// An underlying shape of XZBBox enum.
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub struct XZBBoxRect {
+    /// The "bottom-left" vertex of the rectangle
+    min: XZPoint,
+
+    /// The "top-right" vertex of the rectangle
+    max: XZPoint,
+}
+
+impl XZBBoxRect {
+    pub fn new(min: XZPoint, max: XZPoint) -> Result<Self, String> {
+        let blockx_ge_1 = max.x - min.x >= 0;
+        let blockz_ge_1 = max.z - min.z >= 0;
+
+        if !blockx_ge_1 {
+            return Err(format!(
+                "Invalid XZBBox::Rect: max.x should >= min.x, but encountered {} -> {}",
+                min.x, max.x
+            ));
+        }
+
+        if !blockz_ge_1 {
+            return Err(format!(
+                "Invalid XZBBox::Rect: max.z should >= min.z, but encountered {} -> {}",
+                min.z, max.z
+            ));
+        }
+
+        Ok(Self { min, max })
+    }
+
+    pub fn min(&self) -> XZPoint {
+        self.min
+    }
+
+    pub fn max(&self) -> XZPoint {
+        self.max
+    }
+
+    /// Total number of blocks covered in this 2D bbox
+    pub fn total_blocks(&self) -> u64 {
+        (self.total_blocks_x() as u64) * (self.total_blocks_z() as u64)
+    }
+
+    /// Total number of blocks covered in x direction
+    pub fn total_blocks_x(&self) -> u32 {
+        let nx = self.max.x - self.min.x + 1;
+        nx as u32
+    }
+
+    /// Total number of blocks covered in z direction
+    pub fn total_blocks_z(&self) -> u32 {
+        let nz = self.max.z - self.min.z + 1;
+        nz as u32
+    }
+
+    /// Check whether an XZPoint is covered
+    pub fn contains(&self, xzpoint: &XZPoint) -> bool {
+        xzpoint.x >= self.min.x
+            && xzpoint.x <= self.max.x
+            && xzpoint.z >= self.min.z
+            && xzpoint.z <= self.max.z
+    }
+}
+
+impl fmt::Display for XZBBoxRect {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Rect({} -> {})", self.min, self.max)
+    }
+}
+
+// below are associated +- operators
+impl Add<XZVector> for XZBBoxRect {
+    type Output = XZBBoxRect;
+
+    fn add(self, other: XZVector) -> Self {
+        Self {
+            min: self.min + other,
+            max: self.max + other,
+        }
+    }
+}
+
+impl AddAssign<XZVector> for XZBBoxRect {
+    fn add_assign(&mut self, other: XZVector) {
+        self.min += other;
+        self.max += other;
+    }
+}
+
+impl Sub<XZVector> for XZBBoxRect {
+    type Output = XZBBoxRect;
+
+    fn sub(self, other: XZVector) -> Self {
+        Self {
+            min: self.min - other,
+            max: self.max - other,
+        }
+    }
+}
+
+impl SubAssign<XZVector> for XZBBoxRect {
+    fn sub_assign(&mut self, other: XZVector) {
+        self.min -= other;
+        self.max -= other;
+    }
+}

src/coordinate_system/cartesian/xzbbox/xzbbox_enum.rs

@@ -0,0 +1,202 @@
+use super::rectangle::XZBBoxRect;
+use crate::coordinate_system::cartesian::{XZPoint, XZVector};
+use std::fmt;
+use std::ops::{Add, AddAssign, Sub, SubAssign};
+
+/// Bounding Box in minecraft XZ space with varied shapes.
+#[derive(Clone, Debug)]
+pub enum XZBBox {
+    Rect(XZBBoxRect),
+}
+
+impl XZBBox {
+    /// Construct rectangle shape bbox from the x and z lengths of the world, originated at (0, 0)
+    pub fn rect_from_xz_lengths(length_x: f64, length_z: f64) -> Result<Self, String> {
+        let lenx_ge_0 = length_x >= 0.0;
+        let lenz_ge_0 = length_z >= 0.0;
+        let lenx_overflow = length_x > i32::MAX as f64;
+        let lenz_overflow = length_z > i32::MAX as f64;
+
+        if !lenx_ge_0 {
+            return Err(format!(
+                "Invalid XZBBox::Rect from xz lengths: length x should >=0 , but encountered {length_x}"
+            ));
+        }
+
+        if !lenz_ge_0 {
+            return Err(format!(
+                "Invalid XZBBox::Rect from xz lengths: length z should >=0 , but encountered {length_x}"
+            ));
+        }
+
+        if lenx_overflow {
+            return Err(format!(
+                "Invalid XZBBox::Rect from xz lengths: length x too large for i32: {length_x}"
+            ));
+        }
+
+        if lenz_overflow {
+            return Err(format!(
+                "Invalid XZBBox::Rect from xz lengths: length z too large for i32: {length_z}"
+            ));
+        }
+
+        Ok(Self::Rect(XZBBoxRect::new(
+            XZPoint { x: 0, z: 0 },
+            XZPoint {
+                x: length_x as i32,
+                z: length_z as i32,
+            },
+        )?))
+    }
+
+    /// Check whether an XZPoint is covered
+    pub fn contains(&self, xzpoint: &XZPoint) -> bool {
+        match self {
+            Self::Rect(r) => r.contains(xzpoint),
+        }
+    }
+
+    /// Return the circumscribed rectangle of the current XZBBox shape
+    pub fn bounding_rect(&self) -> XZBBoxRect {
+        match self {
+            Self::Rect(r) => *r,
+        }
+    }
+
+    /// Return the min x in all covered blocks
+    pub fn min_x(&self) -> i32 {
+        self.bounding_rect().min().x
+    }
+
+    /// Return the max x in all covered blocks
+    pub fn max_x(&self) -> i32 {
+        self.bounding_rect().max().x
+    }
+
+    /// Return the min z in all covered blocks
+    pub fn min_z(&self) -> i32 {
+        self.bounding_rect().min().z
+    }
+
+    /// Return the max z in all covered blocks
+    pub fn max_z(&self) -> i32 {
+        self.bounding_rect().max().z
+    }
+}
+
+impl fmt::Display for XZBBox {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Rect(r) => write!(f, "XZBBox::{r}"),
+        }
+    }
+}
+
+// below are associated +- operators
+impl Add<XZVector> for XZBBox {
+    type Output = XZBBox;
+
+    fn add(self, other: XZVector) -> XZBBox {
+        match self {
+            Self::Rect(r) => Self::Rect(r + other),
+        }
+    }
+}
+
+impl AddAssign<XZVector> for XZBBox {
+    fn add_assign(&mut self, other: XZVector) {
+        match self {
+            Self::Rect(r) => *r += other,
+        }
+    }
+}
+
+impl Sub<XZVector> for XZBBox {
+    type Output = XZBBox;
+
+    fn sub(self, other: XZVector) -> XZBBox {
+        match self {
+            Self::Rect(r) => Self::Rect(r - other),
+        }
+    }
+}
+
+impl SubAssign<XZVector> for XZBBox {
+    fn sub_assign(&mut self, other: XZVector) {
+        match self {
+            Self::Rect(r) => *r -= other,
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_valid_inputs() {
+        // 2 * 2
+        let obj = XZBBox::rect_from_xz_lengths(1.0, 1.0);
+        assert!(obj.is_ok());
+        let obj = obj.unwrap();
+        assert_eq!(obj.bounding_rect().total_blocks_x(), 2);
+        assert_eq!(obj.bounding_rect().total_blocks_z(), 2);
+        assert_eq!(obj.bounding_rect().total_blocks(), 4);
+        assert_eq!(obj.min_x(), 0);
+        assert_eq!(obj.max_x(), 1);
+        assert_eq!(obj.min_z(), 0);
+        assert_eq!(obj.max_z(), 1);
+
+        // edge cases
+        // 1 * 2
+        let obj = XZBBox::rect_from_xz_lengths(0.0, 1.0);
+        assert!(obj.is_ok());
+        let obj = obj.unwrap();
+        assert_eq!(obj.bounding_rect().total_blocks_x(), 1);
+        assert_eq!(obj.bounding_rect().total_blocks_z(), 2);
+        assert_eq!(obj.bounding_rect().total_blocks(), 2);
+        assert_eq!(obj.min_x(), 0);
+        assert_eq!(obj.max_x(), 0);
+        assert_eq!(obj.min_z(), 0);
+        assert_eq!(obj.max_z(), 1);
+
+        // 2 * 1
+        let obj = XZBBox::rect_from_xz_lengths(1.0, 0.0);
+        assert!(obj.is_ok());
+        let obj = obj.unwrap();
+        assert_eq!(obj.bounding_rect().total_blocks_x(), 2);
+        assert_eq!(obj.bounding_rect().total_blocks_z(), 1);
+        assert_eq!(obj.bounding_rect().total_blocks(), 2);
+        assert_eq!(obj.min_x(), 0);
+        assert_eq!(obj.max_x(), 1);
+        assert_eq!(obj.min_z(), 0);
+        assert_eq!(obj.max_z(), 0);
+
+        // normal case
+        let obj = XZBBox::rect_from_xz_lengths(123.4, 322.5);
+        assert!(obj.is_ok());
+        let obj = obj.unwrap();
+        assert_eq!(obj.bounding_rect().total_blocks_x(), 124);
+        assert_eq!(obj.bounding_rect().total_blocks_z(), 323);
+        assert_eq!(obj.bounding_rect().total_blocks(), 124 * 323);
+        assert_eq!(obj.min_x(), 0);
+        assert_eq!(obj.max_x(), 123);
+        assert_eq!(obj.min_z(), 0);
+        assert_eq!(obj.max_z(), 322);
+    }
+
+    #[test]
+    #[allow(clippy::excessive_precision)]
+    fn test_invalid_inputs() {
+        assert!(XZBBox::rect_from_xz_lengths(-1.0, 1.5).is_err());
+        assert!(XZBBox::rect_from_xz_lengths(1323.5, -3287238791.395).is_err());
+        assert!(XZBBox::rect_from_xz_lengths(-239928341323.29389498, -3287238791.938395).is_err());
+        assert!(XZBBox::rect_from_xz_lengths(-0.1, 1.5).is_err());
+        assert!(XZBBox::rect_from_xz_lengths(-0.5, 1.5).is_err());
+        assert!(XZBBox::rect_from_xz_lengths(123948761293874123.2398, -0.5).is_err());
+
+        assert!(XZBBox::rect_from_xz_lengths(i32::MAX as f64 + 10.0, -0.5).is_err());
+        assert!(XZBBox::rect_from_xz_lengths(0.2, i32::MAX as f64 + 10.0).is_err());
+    }
+}

src/coordinate_system/cartesian/xzpoint.rs

@@ -0,0 +1,70 @@
+use super::xzvector::XZVector;
+use serde::Deserialize;
+use std::fmt;
+use std::ops::{Add, AddAssign, Sub, SubAssign};
+
+#[derive(Debug, Deserialize, Copy, Clone, PartialEq)]
+pub struct XZPoint {
+    pub x: i32,
+    pub z: i32,
+}
+
+impl XZPoint {
+    pub fn new(x: i32, z: i32) -> Self {
+        Self { x, z }
+    }
+}
+
+impl fmt::Display for XZPoint {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "XZPoint({}, {})", self.x, self.z)
+    }
+}
+
+// below are associated +- operators
+impl Add<XZVector> for XZPoint {
+    type Output = XZPoint;
+
+    fn add(self, other: XZVector) -> XZPoint {
+        XZPoint {
+            x: self.x + other.dx,
+            z: self.z + other.dz,
+        }
+    }
+}
+
+impl AddAssign<XZVector> for XZPoint {
+    fn add_assign(&mut self, other: XZVector) {
+        self.x += other.dx;
+        self.z += other.dz;
+    }
+}
+
+impl Sub for XZPoint {
+    type Output = XZVector;
+
+    fn sub(self, other: XZPoint) -> XZVector {
+        XZVector {
+            dx: self.x - other.x,
+            dz: self.z - other.z,
+        }
+    }
+}
+
+impl Sub<XZVector> for XZPoint {
+    type Output = XZPoint;
+
+    fn sub(self, other: XZVector) -> XZPoint {
+        XZPoint {
+            x: self.x - other.dx,
+            z: self.z - other.dz,
+        }
+    }
+}
+
+impl SubAssign<XZVector> for XZPoint {
+    fn sub_assign(&mut self, other: XZVector) {
+        self.x -= other.dx;
+        self.z -= other.dz;
+    }
+}

src/coordinate_system/cartesian/xzvector.rs

@@ -0,0 +1,56 @@
+use serde::Deserialize;
+use std::fmt;
+use std::ops::{Add, AddAssign, Sub, SubAssign};
+
+/// Vector between two points in minecraft xz space.
+#[derive(Debug, Deserialize, Copy, Clone, PartialEq)]
+pub struct XZVector {
+    /// Increment in x direction
+    pub dx: i32,
+
+    /// Increment in z direction
+    pub dz: i32,
+}
+
+impl fmt::Display for XZVector {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "XZVector({}, {})", self.dx, self.dz)
+    }
+}
+
+// below are associated +- operators
+impl Add for XZVector {
+    type Output = XZVector;
+
+    fn add(self, other: XZVector) -> XZVector {
+        XZVector {
+            dx: self.dx + other.dx,
+            dz: self.dz + other.dz,
+        }
+    }
+}
+
+impl AddAssign for XZVector {
+    fn add_assign(&mut self, other: XZVector) {
+        self.dx += other.dx;
+        self.dz += other.dz;
+    }
+}
+
+impl Sub for XZVector {
+    type Output = XZVector;
+
+    fn sub(self, other: XZVector) -> XZVector {
+        XZVector {
+            dx: self.dx - other.dx,
+            dz: self.dz - other.dz,
+        }
+    }
+}
+
+impl SubAssign for XZVector {
+    fn sub_assign(&mut self, other: XZVector) {
+        self.dx -= other.dx;
+        self.dz -= other.dz;
+    }
+}

src/coordinate_system/geographic/llbbox.rs

@@ -0,0 +1,125 @@
+use super::llpoint::LLPoint;
+
+/// A checked Bounding Box.
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub struct LLBBox {
+    /// The "bottom-left" vertex of the rectangle
+    min: LLPoint,
+
+    /// The "top-right" vertex of the rectangle
+    max: LLPoint,
+}
+
+impl LLBBox {
+    pub fn new(min_lat: f64, min_lng: f64, max_lat: f64, max_lng: f64) -> Result<Self, String> {
+        if min_lng >= max_lng {
+            return Err(format!(
+                "Invalid LLBBox: min_lng {min_lng} >= max_lng {max_lng}"
+            ));
+        }
+        if min_lat >= max_lat {
+            return Err(format!(
+                "Invalid LLBBox: min_lat {min_lat} >= max_lat {max_lat}"
+            ));
+        }
+
+        let min = LLPoint::new(min_lat, min_lng)?;
+        let max = LLPoint::new(max_lat, max_lng)?;
+
+        Ok(Self { min, max })
+    }
+
+    pub fn from_str(s: &str) -> Result<Self, String> {
+        let [min_lat, min_lng, max_lat, max_lng]: [f64; 4] = s
+            .split([',', ' '])
+            .map(|e| e.parse().unwrap())
+            .collect::<Vec<_>>()
+            .try_into()
+            .unwrap();
+
+        // So, the GUI does Lat/Lng and no GDAL (comma-sep values), which is the exact opposite of
+        // what bboxfinder.com does. :facepalm: (bboxfinder is wrong here: Lat comes first!)
+        // DO NOT MODIFY THIS! It's correct. The CLI/GUI is passing you the numbers incorrectly.
+        Self::new(min_lat, min_lng, max_lat, max_lng)
+    }
+
+    pub fn min(&self) -> LLPoint {
+        self.min
+    }
+
+    pub fn max(&self) -> LLPoint {
+        self.max
+    }
+
+    pub fn contains(&self, llpoint: &LLPoint) -> bool {
+        llpoint.lat() >= self.min().lat()
+            && llpoint.lat() <= self.max().lat()
+            && llpoint.lng() >= self.min().lng()
+            && llpoint.lng() <= self.max().lng()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_valid_input() {
+        assert!(LLBBox::new(0., 0., 1., 1.).is_ok());
+
+        assert!(LLBBox::new(1., 2., 3., 4.).is_ok());
+
+        // Arnis, Germany
+        assert!(LLBBox::new(54.627053, 9.927928, 54.634902, 9.937563).is_ok());
+
+        // Royal Observatory Greenwich, London, UK
+        assert!(LLBBox::new(51.470000, -0.015000, 51.480000, 0.015000).is_ok());
+
+        // The Bund, Shanghai, China
+        assert!(LLBBox::new(31.23256, 121.46768, 31.24993, 121.50394).is_ok());
+
+        // Santa Monica, Los Angeles, US
+        assert!(LLBBox::new(34.00348, -118.51226, 34.02033, -118.47600).is_ok());
+
+        // Sydney Opera House, Sydney, Australia
+        assert!(LLBBox::new(-33.861035, 151.204137, -33.852597, 151.222268).is_ok());
+    }
+
+    #[test]
+    fn test_from_str_commas() {
+        const ARNIS_STR: &str = "9.927928,54.627053,9.937563,54.634902";
+
+        let bbox_result = LLBBox::from_str(ARNIS_STR);
+        assert!(bbox_result.is_ok());
+
+        let arnis_correct: LLBBox = LLBBox {
+            min: LLPoint::new(9.927928, 54.627053).unwrap(),
+            max: LLPoint::new(9.937563, 54.634902).unwrap(),
+        };
+
+        assert_eq!(bbox_result.unwrap(), arnis_correct);
+    }
+
+    #[test]
+    fn test_from_str_spaces() {
+        const ARNIS_SPACE_STR: &str = "9.927928 54.627053 9.937563 54.634902";
+
+        let bbox_result = LLBBox::from_str(ARNIS_SPACE_STR);
+        assert!(bbox_result.is_ok());
+
+        let arnis_correct: LLBBox = LLBBox {
+            min: LLPoint::new(9.927928, 54.627053).unwrap(),
+            max: LLPoint::new(9.937563, 54.634902).unwrap(),
+        };
+
+        assert_eq!(bbox_result.unwrap(), arnis_correct);
+    }
+
+    #[test]
+    fn test_out_of_order() {
+        // Violates values in vals_in_order
+        assert!(LLBBox::new(0., 0., 0., 0.).is_err());
+        assert!(LLBBox::new(1., 0., 0., 1.).is_err());
+        assert!(LLBBox::new(0., 1., 1., 0.).is_err());
+    }
+}

src/coordinate_system/geographic/llpoint.rs

@@ -0,0 +1,60 @@
+/// Bounds-checked longitude and latitude.
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub struct LLPoint {
+    lat: f64,
+    lng: f64,
+}
+
+impl LLPoint {
+    pub fn new(lat: f64, lng: f64) -> Result<Self, String> {
+        let lat_in_range = (-90.0..=90.0).contains(&lat);
+        let lng_in_range = (-180.0..=180.0).contains(&lng);
+
+        if !lat_in_range {
+            return Err(format!("Latitude {lat} not in range -90.0..=90.0"));
+        }
+
+        if !lng_in_range {
+            return Err(format!("Longitude {lng} not in range -180.0..=180.0"));
+        }
+
+        Ok(Self { lat, lng })
+    }
+
+    pub fn lat(&self) -> f64 {
+        self.lat
+    }
+
+    pub fn lng(&self) -> f64 {
+        self.lng
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_valid_input() {
+        assert!(LLPoint::new(0., 0.).is_ok());
+
+        // latitude extremes
+        assert!(LLPoint::new(-90.0, 0.).is_ok());
+        assert!(LLPoint::new(90.0, 0.).is_ok());
+
+        // longitude extremes
+        assert!(LLPoint::new(0., -180.0).is_ok());
+        assert!(LLPoint::new(0., 180.0).is_ok());
+    }
+
+    #[test]
+    fn test_out_of_bounds() {
+        // latitude out-of-bounds
+        assert!(LLPoint::new(-91., 0.).is_err());
+        assert!(LLPoint::new(91., 0.).is_err());
+
+        // longitude out-of-bounds
+        assert!(LLPoint::new(0., -181.).is_err());
+        assert!(LLPoint::new(0., 181.).is_err());
+    }
+}

src/coordinate_system/geographic/mod.rs

@@ -0,0 +1,5 @@
+mod llbbox;
+mod llpoint;
+
+pub use llbbox::LLBBox;
+pub use llpoint::LLPoint;

src/coordinate_system/mod.rs

@@ -0,0 +1,3 @@
+pub mod cartesian;
+pub mod geographic;
+pub mod transformation;

src/coordinate_system/transformation.rs

@@ -0,0 +1,185 @@
+use super::cartesian::{XZBBox, XZPoint};
+use super::geographic::{LLBBox, LLPoint};
+
+/// Transform geographic space (within llbbox) to a local tangential cartesian space (within xzbbox)
+pub struct CoordTransformer {
+    len_lat: f64,
+    len_lng: f64,
+    scale_factor_x: f64,
+    scale_factor_z: f64,
+    min_lat: f64,
+    min_lng: f64,
+}
+
+impl CoordTransformer {
+    pub fn scale_factor_x(&self) -> f64 {
+        self.scale_factor_x
+    }
+
+    pub fn scale_factor_z(&self) -> f64 {
+        self.scale_factor_z
+    }
+
+    pub fn llbbox_to_xzbbox(
+        llbbox: &LLBBox,
+        scale: f64,
+    ) -> Result<(CoordTransformer, XZBBox), String> {
+        let err_header = "Construct LLBBox to XZBBox transformation failed".to_string();
+
+        if scale <= 0.0 {
+            return Err(format!("{}: scale <= 0.0", &err_header));
+        }
+
+        let (scale_factor_z, scale_factor_x) = geo_distance(llbbox.min(), llbbox.max());
+        let scale_factor_z: f64 = scale_factor_z.floor() * scale;
+        let scale_factor_x: f64 = scale_factor_x.floor() * scale;
+
+        let xzbbox = XZBBox::rect_from_xz_lengths(scale_factor_x, scale_factor_z)
+            .map_err(|e| format!("{}:\n{}", &err_header, e))?;
+
+        Ok((
+            Self {
+                len_lat: llbbox.max().lat() - llbbox.min().lat(),
+                len_lng: llbbox.max().lng() - llbbox.min().lng(),
+                scale_factor_x,
+                scale_factor_z,
+                min_lat: llbbox.min().lat(),
+                min_lng: llbbox.min().lng(),
+            },
+            xzbbox,
+        ))
+    }
+
+    pub fn transform_point(&self, llpoint: LLPoint) -> XZPoint {
+        // Calculate the relative position within the bounding box
+        let rel_x: f64 = (llpoint.lng() - self.min_lng) / self.len_lng;
+        let rel_z: f64 = 1.0 - (llpoint.lat() - self.min_lat) / self.len_lat;
+
+        // Apply scaling factors for each dimension and convert to Minecraft coordinates
+        let x: i32 = (rel_x * self.scale_factor_x) as i32;
+        let z: i32 = (rel_z * self.scale_factor_z) as i32;
+
+        XZPoint::new(x, z)
+    }
+}
+
+// (lat meters, lon meters)
+#[inline]
+pub fn geo_distance(a: LLPoint, b: LLPoint) -> (f64, f64) {
+    let z: f64 = lat_distance(a.lat(), b.lat());
+
+    // distance between two lons depends on their latitude. In this case we'll just average them
+    let x: f64 = lon_distance((a.lat() + b.lat()) / 2.0, a.lng(), b.lng());
+
+    (z, x)
+}
+
+// Haversine but optimized for a latitude delta of 0
+// returns meters
+fn lon_distance(lat: f64, lon1: f64, lon2: f64) -> f64 {
+    const R: f64 = 6_371_000.0;
+    let d_lon: f64 = (lon2 - lon1).to_radians();
+    let a: f64 =
+        lat.to_radians().cos() * lat.to_radians().cos() * (d_lon / 2.0).sin() * (d_lon / 2.0).sin();
+    let c: f64 = 2.0 * a.sqrt().atan2((1.0 - a).sqrt());
+
+    R * c
+}
+
+// Haversine but optimized for a longitude delta of 0
+// returns meters
+fn lat_distance(lat1: f64, lat2: f64) -> f64 {
+    const R: f64 = 6_371_000.0;
+    let d_lat: f64 = (lat2 - lat1).to_radians();
+    let a: f64 = (d_lat / 2.0).sin() * (d_lat / 2.0).sin();
+    let c: f64 = 2.0 * a.sqrt().atan2((1.0 - a).sqrt());
+
+    R * c
+}
+
+// copied legacy code
+// Function to convert latitude and longitude to Minecraft coordinates.
+// Function to convert latitude and longitude to Minecraft coordinates.
+#[cfg(test)]
+pub fn lat_lon_to_minecraft_coords(
+    lat: f64,
+    lon: f64,
+    bbox: LLBBox, // (min_lon, min_lat, max_lon, max_lat)
+    scale_factor_z: f64,
+    scale_factor_x: f64,
+) -> (i32, i32) {
+    // Calculate the relative position within the bounding box
+    let rel_x: f64 = (lon - bbox.min().lng()) / (bbox.max().lng() - bbox.min().lng());
+    let rel_z: f64 = 1.0 - (lat - bbox.min().lat()) / (bbox.max().lat() - bbox.min().lat());
+
+    // Apply scaling factors for each dimension and convert to Minecraft coordinates
+    let x: i32 = (rel_x * scale_factor_x) as i32;
+    let z: i32 = (rel_z * scale_factor_z) as i32;
+
+    (x, z)
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::test_utilities::get_llbbox_arnis;
+
+    fn test_llxztransform_one_scale_one_factor(
+        scale: f64,
+        test_latfactor: f64,
+        test_lngfactor: f64,
+    ) {
+        let llbbox = get_llbbox_arnis();
+        let llpoint = LLPoint::new(
+            llbbox.min().lat() + (llbbox.max().lat() - llbbox.min().lat()) * test_latfactor,
+            llbbox.min().lng() + (llbbox.max().lng() - llbbox.min().lng()) * test_lngfactor,
+        )
+        .unwrap();
+        let (transformer, xzbbox_new) = CoordTransformer::llbbox_to_xzbbox(&llbbox, scale).unwrap();
+
+        // legacy xzbbox creation
+        let (scale_factor_z, scale_factor_x) = geo_distance(llbbox.min(), llbbox.max());
+        let scale_factor_z: f64 = scale_factor_z.floor() * scale;
+        let scale_factor_x: f64 = scale_factor_x.floor() * scale;
+        let xzbbox_old = XZBBox::rect_from_xz_lengths(scale_factor_x, scale_factor_z).unwrap();
+
+        // legacy coord transform
+        let (x, z) = lat_lon_to_minecraft_coords(
+            llpoint.lat(),
+            llpoint.lng(),
+            llbbox,
+            scale_factor_z,
+            scale_factor_x,
+        );
+        // new coord transform
+        let xzpoint = transformer.transform_point(llpoint);
+
+        assert_eq!(x, xzpoint.x);
+        assert_eq!(z, xzpoint.z);
+        assert_eq!(xzbbox_new.min_x(), xzbbox_old.min_x());
+        assert_eq!(xzbbox_new.max_x(), xzbbox_old.max_x());
+        assert_eq!(xzbbox_new.min_z(), xzbbox_old.min_z());
+        assert_eq!(xzbbox_new.max_z(), xzbbox_old.max_z());
+    }
+
+    // this ensures that transformer.transform_point == legacy lat_lon_to_minecraft_coords
+    #[test]
+    pub fn test_llxztransform() {
+        test_llxztransform_one_scale_one_factor(1.0, 0.5, 0.5);
+        test_llxztransform_one_scale_one_factor(3.0, 0.1, 0.2);
+        test_llxztransform_one_scale_one_factor(10.0, -1.2, 2.0);
+        test_llxztransform_one_scale_one_factor(0.4, 0.3, -0.2);
+        test_llxztransform_one_scale_one_factor(0.1, 0.2, 0.7);
+    }
+
+    // this ensures that invalid inputs can be handled correctly
+    #[test]
+    pub fn test_invalid_construct() {
+        let llbbox = get_llbbox_arnis();
+        let obj = CoordTransformer::llbbox_to_xzbbox(&llbbox, 0.0);
+        assert!(obj.is_err());
+
+        let obj = CoordTransformer::llbbox_to_xzbbox(&llbbox, -1.2);
+        assert!(obj.is_err());
+    }
+}

src/data_processing.rs

@@ -1,32 +1,39 @@
 use crate::args::Args;
-use crate::block_definitions::{DIRT, GRASS_BLOCK, SNOW_BLOCK};
-use crate::cartesian::XZPoint;
+use crate::block_definitions::{BEDROCK, DIRT, GRASS_BLOCK, STONE};
+use crate::coordinate_system::cartesian::XZBBox;
+use crate::coordinate_system::geographic::LLBBox;
 use crate::element_processing::*;
 use crate::ground::Ground;
+use crate::map_renderer;
 use crate::osm_parser::ProcessedElement;
-use crate::progress::emit_gui_progress_update;
+use crate::progress::{emit_gui_progress_update, emit_map_preview_ready};
+#[cfg(feature = "gui")]
+use crate::telemetry::{send_log, LogLevel};
 use crate::world_editor::WorldEditor;
 use colored::Colorize;
 use indicatif::{ProgressBar, ProgressStyle};
 
-const MIN_Y: i32 = -64;
+pub const MIN_Y: i32 = -64;
 
 pub fn generate_world(
     elements: Vec<ProcessedElement>,
+    xzbbox: XZBBox,
+    llbbox: LLBBox,
+    ground: Ground,
     args: &Args,
-    scale_factor_x: f64,
-    scale_factor_z: f64,
 ) -> Result<(), String> {
-    let region_dir: String = format!("{}/region", args.path);
-    let mut editor: WorldEditor = WorldEditor::new(&region_dir, scale_factor_x, scale_factor_z);
+    let mut editor: WorldEditor = WorldEditor::new(args.path.clone(), &xzbbox, llbbox);
 
-    println!("{} Processing data...", "[3/5]".bold());
-    if args.terrain {
-        emit_gui_progress_update(10.0, "Fetching elevation...");
-    }
-    let ground: Ground = Ground::new(args);
+    println!("{} Processing data...", "[4/7]".bold());
 
-    emit_gui_progress_update(11.0, "Processing terrain...");
+    // Build highway connectivity map once before processing
+    let highway_connectivity = highways::build_highway_connectivity_map(&elements);
+
+    // Set ground reference in the editor to enable elevation-aware block placement
+    editor.set_ground(&ground);
+
+    println!("{} Processing terrain...", "[5/7]".bold());
+    emit_gui_progress_update(25.0, "Processing terrain...");
 
     // Process data
     let elements_count: usize = elements.len();
@@ -36,8 +43,8 @@ pub fn generate_world(
         .unwrap()
         .progress_chars("█▓░"));
 
-    let progress_increment_prcs: f64 = 49.0 / elements_count as f64;
-    let mut current_progress_prcs: f64 = 11.0;
+    let progress_increment_prcs: f64 = 45.0 / elements_count as f64;
+    let mut current_progress_prcs: f64 = 25.0;
     let mut last_emitted_progress: f64 = current_progress_prcs;
 
     for element in &elements {
@@ -61,56 +68,83 @@ pub fn generate_world(
         match element {
             ProcessedElement::Way(way) => {
                 if way.tags.contains_key("building") || way.tags.contains_key("building:part") {
-                    buildings::generate_buildings(&mut editor, way, &ground, args, None);
+                    buildings::generate_buildings(&mut editor, way, args, None);
                 } else if way.tags.contains_key("highway") {
-                    highways::generate_highways(&mut editor, element, &ground, args);
+                    highways::generate_highways(&mut editor, element, args, &highway_connectivity);
                 } else if way.tags.contains_key("landuse") {
-                    landuse::generate_landuse(&mut editor, way, &ground, args);
+                    landuse::generate_landuse(&mut editor, way, args);
                 } else if way.tags.contains_key("natural") {
-                    natural::generate_natural(&mut editor, element, &ground, args);
+                    natural::generate_natural(&mut editor, element, args);
                 } else if way.tags.contains_key("amenity") {
-                    amenities::generate_amenities(&mut editor, element, &ground, args);
+                    amenities::generate_amenities(&mut editor, element, args);
                 } else if way.tags.contains_key("leisure") {
-                    leisure::generate_leisure(&mut editor, way, &ground, args);
+                    leisure::generate_leisure(&mut editor, way, args);
                 } else if way.tags.contains_key("barrier") {
-                    barriers::generate_barriers(&mut editor, element, &ground);
-                } else if way.tags.contains_key("waterway") {
-                    waterways::generate_waterways(&mut editor, way, &ground);
+                    barriers::generate_barriers(&mut editor, element);
+                } else if let Some(val) = way.tags.get("waterway") {
+                    if val == "dock" {
+                        // docks count as water areas
+                        water_areas::generate_water_area_from_way(&mut editor, way, &xzbbox);
+                    } else {
+                        waterways::generate_waterways(&mut editor, way);
+                    }
                 } else if way.tags.contains_key("bridge") {
                     //bridges::generate_bridges(&mut editor, way, ground_level); // TODO FIX
                 } else if way.tags.contains_key("railway") {
-                    railways::generate_railways(&mut editor, way, &ground);
+                    railways::generate_railways(&mut editor, way);
+                } else if way.tags.contains_key("roller_coaster") {
+                    railways::generate_roller_coaster(&mut editor, way);
                 } else if way.tags.contains_key("aeroway") || way.tags.contains_key("area:aeroway")
                 {
-                    highways::generate_aeroway(&mut editor, way, &ground);
+                    highways::generate_aeroway(&mut editor, way, args);
                 } else if way.tags.get("service") == Some(&"siding".to_string()) {
-                    highways::generate_siding(&mut editor, way, &ground);
+                    highways::generate_siding(&mut editor, way);
+                } else if way.tags.contains_key("man_made") {
+                    man_made::generate_man_made(&mut editor, element, args);
                 }
             }
             ProcessedElement::Node(node) => {
                 if node.tags.contains_key("door") || node.tags.contains_key("entrance") {
-                    doors::generate_doors(&mut editor, node, &ground);
+                    doors::generate_doors(&mut editor, node);
                 } else if node.tags.contains_key("natural")
                     && node.tags.get("natural") == Some(&"tree".to_string())
                 {
-                    natural::generate_natural(&mut editor, element, &ground, args);
+                    natural::generate_natural(&mut editor, element, args);
                 } else if node.tags.contains_key("amenity") {
-                    amenities::generate_amenities(&mut editor, element, &ground, args);
+                    amenities::generate_amenities(&mut editor, element, args);
                 } else if node.tags.contains_key("barrier") {
-                    barriers::generate_barriers(&mut editor, element, &ground);
+                    barriers::generate_barrier_nodes(&mut editor, node);
                 } else if node.tags.contains_key("highway") {
-                    highways::generate_highways(&mut editor, element, &ground, args);
+                    highways::generate_highways(&mut editor, element, args, &highway_connectivity);
                 } else if node.tags.contains_key("tourism") {
-                    tourisms::generate_tourisms(&mut editor, node, &ground);
+                    tourisms::generate_tourisms(&mut editor, node);
+                } else if node.tags.contains_key("man_made") {
+                    man_made::generate_man_made_nodes(&mut editor, node);
                 }
             }
             ProcessedElement::Relation(rel) => {
                 if rel.tags.contains_key("building") || rel.tags.contains_key("building:part") {
-                    buildings::generate_building_from_relation(&mut editor, rel, &ground, args);
-                } else if rel.tags.contains_key("water") {
-                    water_areas::generate_water_areas(&mut editor, rel, &ground);
+                    buildings::generate_building_from_relation(&mut editor, rel, args);
+                } else if rel.tags.contains_key("water")
+                    || rel
+                        .tags
+                        .get("natural")
+                        .map(|val| val == "water" || val == "bay")
+                        .unwrap_or(false)
+                {
+                    water_areas::generate_water_areas_from_relation(&mut editor, rel, &xzbbox);
+                } else if rel.tags.contains_key("natural") {
+                    natural::generate_natural_from_relation(&mut editor, rel, args);
+                } else if rel.tags.contains_key("landuse") {
+                    landuse::generate_landuse_from_relation(&mut editor, rel, args);
                 } else if rel.tags.get("leisure") == Some(&"park".to_string()) {
-                    leisure::generate_leisure_from_relation(&mut editor, rel, &ground, args);
+                    leisure::generate_leisure_from_relation(&mut editor, rel, args);
+                } else if rel.tags.contains_key("man_made") {
+                    man_made::generate_man_made(
+                        &mut editor,
+                        &ProcessedElement::Relation(rel.clone()),
+                        args,
+                    );
                 }
             }
         }
@@ -119,14 +153,14 @@ pub fn generate_world(
     process_pb.finish();
 
     // Generate ground layer
-    let total_blocks: u64 = (scale_factor_x as i32 + 1) as u64 * (scale_factor_z as i32 + 1) as u64;
+    let total_blocks: u64 = xzbbox.bounding_rect().total_blocks();
     let desired_updates: u64 = 1500;
     let batch_size: u64 = (total_blocks / desired_updates).max(1);
 
     let mut block_counter: u64 = 0;
 
-    println!("{} Generating ground...", "[4/5]".bold());
-    emit_gui_progress_update(60.0, "Generating ground...");
+    println!("{} Generating ground...", "[6/7]".bold());
+    emit_gui_progress_update(70.0, "Generating ground...");
 
     let ground_pb: ProgressBar = ProgressBar::new(total_blocks);
     ground_pb.set_style(
@@ -136,77 +170,51 @@ pub fn generate_world(
             .progress_chars("█▓░"),
     );
 
-    let mut gui_progress_grnd: f64 = 60.0;
+    let mut gui_progress_grnd: f64 = 70.0;
     let mut last_emitted_progress: f64 = gui_progress_grnd;
-    let total_iterations_grnd: f64 = (scale_factor_x + 1.0) * (scale_factor_z + 1.0);
-    let progress_increment_grnd: f64 = 30.0 / total_iterations_grnd;
+    let total_iterations_grnd: f64 = total_blocks as f64;
+    let progress_increment_grnd: f64 = 20.0 / total_iterations_grnd;
 
-    let groundlayer_block = if args.winter { SNOW_BLOCK } else { GRASS_BLOCK };
+    let groundlayer_block = GRASS_BLOCK;
 
-    // Differentiate between terrain and non-terrain generation
-    if ground.elevation_enabled {
-        // Pre-calculate ground levels for all points
-        let mut ground_levels: Vec<Vec<i32>> = Vec::with_capacity(scale_factor_x as usize + 1);
-        for x in 0..=(scale_factor_x as i32) {
-            let mut row = Vec::with_capacity(scale_factor_z as usize + 1);
-            for z in 0..=(scale_factor_z as i32) {
-                row.push(ground.level(XZPoint::new(x, z)));
+    for x in xzbbox.min_x()..=xzbbox.max_x() {
+        for z in xzbbox.min_z()..=xzbbox.max_z() {
+            // Add default dirt and grass layer if there isn't a stone layer already
+            if !editor.check_for_block(x, 0, z, Some(&[STONE])) {
+                editor.set_block(groundlayer_block, x, 0, z, None, None);
+                editor.set_block(DIRT, x, -1, z, None, None);
+                editor.set_block(DIRT, x, -2, z, None, None);
             }
-            ground_levels.push(row);
-        }
 
-        // Process blocks in larger batches
-        for x in 0..=(scale_factor_x as i32) {
-            for z in 0..=(scale_factor_z as i32) {
-                let ground_level = ground_levels[x as usize][z as usize];
-
-                // Find the highest block in this column
-                let max_y = (MIN_Y..ground_level)
-                    .find(|y: &i32| editor.block_at(x, *y, z))
-                    .unwrap_or(ground_level)
-                    .min(ground_level);
-
-                // Set blocks in a single batch
-                editor.set_block(groundlayer_block, x, max_y, z, None, None);
-                editor.set_block(DIRT, x, max_y - 1, z, None, None);
-                editor.set_block(DIRT, x, max_y - 2, z, None, None);
-
-                block_counter += 1;
-                if block_counter % batch_size == 0 {
-                    ground_pb.inc(batch_size);
-                }
-
-                gui_progress_grnd += progress_increment_grnd;
-                if (gui_progress_grnd - last_emitted_progress).abs() > 0.25 {
-                    emit_gui_progress_update(gui_progress_grnd, "");
-                    last_emitted_progress = gui_progress_grnd;
-                }
+            // Fill underground with stone
+            if args.fillground {
+                // Fill from bedrock+1 to 3 blocks below ground with stone
+                editor.fill_blocks_absolute(
+                    STONE,
+                    x,
+                    MIN_Y + 1,
+                    z,
+                    x,
+                    editor.get_absolute_y(x, -3, z),
+                    z,
+                    None,
+                    None,
+                );
             }
-        }
+            // Generate a bedrock level at MIN_Y
+            editor.set_block_absolute(BEDROCK, x, MIN_Y, z, None, Some(&[BEDROCK]));
 
-        // Set blocks at spawn location
-        for x in 0..=20 {
-            for z in 0..=20 {
-                editor.set_block(groundlayer_block, x, -62, z, None, None);
+            block_counter += 1;
+            // Use manual % check since is_multiple_of() is unstable on stable Rust
+            #[allow(clippy::manual_is_multiple_of)]
+            if block_counter % batch_size == 0 {
+                ground_pb.inc(batch_size);
             }
-        }
-    } else {
-        for x in 0..=(scale_factor_x as i32) {
-            for z in 0..=(scale_factor_z as i32) {
-                let ground_level = ground.level(XZPoint::new(x, z));
-                editor.set_block(groundlayer_block, x, ground_level, z, None, None);
-                editor.set_block(DIRT, x, ground_level - 1, z, None, None);
 
-                block_counter += 1;
-                if block_counter % batch_size == 0 {
-                    ground_pb.inc(batch_size);
-                }
-
-                gui_progress_grnd += progress_increment_grnd;
-                if (gui_progress_grnd - last_emitted_progress).abs() > 0.25 {
-                    emit_gui_progress_update(gui_progress_grnd, "");
-                    last_emitted_progress = gui_progress_grnd;
-                }
+            gui_progress_grnd += progress_increment_grnd;
+            if (gui_progress_grnd - last_emitted_progress).abs() > 0.25 {
+                emit_gui_progress_update(gui_progress_grnd, "");
+                last_emitted_progress = gui_progress_grnd;
             }
         }
     }
@@ -229,7 +237,83 @@ pub fn generate_world(
     // Save world
     editor.save();
 
+    // Update player spawn Y coordinate based on terrain height after generation
+    #[cfg(feature = "gui")]
+    if let Some(spawn_coords) = &args.spawn_point {
+        use crate::gui::update_player_spawn_y_after_generation;
+        let bbox_string = format!(
+            "{},{},{},{}",
+            args.bbox.min().lng(),
+            args.bbox.min().lat(),
+            args.bbox.max().lng(),
+            args.bbox.max().lat()
+        );
+
+        if let Err(e) = update_player_spawn_y_after_generation(
+            &args.path,
+            Some(*spawn_coords),
+            bbox_string,
+            args.scale,
+            &ground,
+        ) {
+            let warning_msg = format!("Failed to update spawn point Y coordinate: {}", e);
+            eprintln!("Warning: {}", warning_msg);
+            #[cfg(feature = "gui")]
+            send_log(LogLevel::Warning, &warning_msg);
+        }
+    }
+
     emit_gui_progress_update(100.0, "Done! World generation completed.");
     println!("{}", "Done! World generation completed.".green().bold());
+
+    // Generate top-down map preview:
+    // - Always for GUI mode (non-blocking, runs in background)
+    // - Only when --generate-map flag is set for CLI mode (blocking, waits for completion)
+    #[cfg(feature = "gui")]
+    let should_generate_map = true;
+    #[cfg(not(feature = "gui"))]
+    let should_generate_map = args.generate_map;
+
+    if should_generate_map {
+        let world_path = args.path.clone();
+        let bounds = (
+            xzbbox.min_x(),
+            xzbbox.max_x(),
+            xzbbox.min_z(),
+            xzbbox.max_z(),
+        );
+
+        let map_thread = std::thread::spawn(move || {
+            // Use catch_unwind to prevent any panic from affecting the application
+            let result = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
+                map_renderer::render_world_map(&world_path, bounds.0, bounds.1, bounds.2, bounds.3)
+            }));
+
+            match result {
+                Ok(Ok(_path)) => {
+                    // Notify the GUI that the map preview is ready
+                    emit_map_preview_ready();
+                }
+                Ok(Err(e)) => {
+                    eprintln!("Warning: Failed to generate map preview: {}", e);
+                }
+                Err(_) => {
+                    eprintln!("Warning: Map preview generation panicked unexpectedly");
+                }
+            }
+        });
+
+        // In CLI mode, wait for map generation to complete before exiting
+        // In GUI mode, let it run in background to keep UI responsive
+        #[cfg(not(feature = "gui"))]
+        {
+            let _ = map_thread.join();
+        }
+
+        // In GUI mode, we don't join, let the thread run in background
+        #[cfg(feature = "gui")]
+        drop(map_thread);
+    }
+
     Ok(())
 }

src/element_processing/amenities.rs

@@ -1,18 +1,12 @@
 use crate::args::Args;
 use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
-use crate::cartesian::XZPoint;
+use crate::coordinate_system::cartesian::XZPoint;
 use crate::floodfill::flood_fill_area;
-use crate::ground::Ground;
 use crate::osm_parser::ProcessedElement;
 use crate::world_editor::WorldEditor;
 
-pub fn generate_amenities(
-    editor: &mut WorldEditor,
-    element: &ProcessedElement,
-    ground: &Ground,
-    args: &Args,
-) {
+pub fn generate_amenities(editor: &mut WorldEditor, element: &ProcessedElement, args: &Args) {
     // Skip if 'layer' or 'level' is negative in the tags
     if let Some(layer) = element.tags().get("layer") {
         if layer.parse::<i32>().unwrap_or(0) < 0 {
@@ -35,15 +29,13 @@ pub fn generate_amenities(
             "waste_disposal" | "waste_basket" => {
                 // Place a cauldron for waste disposal or waste basket
                 if let Some(pt) = first_node {
-                    editor.set_block(CAULDRON, pt.x, ground.level(pt) + 1, pt.z, None, None);
+                    editor.set_block(CAULDRON, pt.x, 1, pt.z, None, None);
                 }
             }
             "vending_machine" | "atm" => {
                 if let Some(pt) = first_node {
-                    let y = ground.level(pt);
-
-                    editor.set_block(IRON_BLOCK, pt.x, y + 1, pt.z, None, None);
-                    editor.set_block(IRON_BLOCK, pt.x, y + 2, pt.z, None, None);
+                    editor.set_block(IRON_BLOCK, pt.x, 1, pt.z, None, None);
+                    editor.set_block(IRON_BLOCK, pt.x, 2, pt.z, None, None);
                 }
             }
             "bicycle_parking" => {
@@ -54,61 +46,50 @@ pub fn generate_amenities(
                     .nodes()
                     .map(|n: &crate::osm_parser::ProcessedNode| (n.x, n.z))
                     .collect();
-                let floor_area: Vec<(i32, i32)> =
-                    flood_fill_area(&polygon_coords, args.timeout.as_ref());
 
-                let pts: Vec<_> = floor_area.iter().map(|c| XZPoint::new(c.0, c.1)).collect();
-
-                if pts.is_empty() {
+                if polygon_coords.is_empty() {
                     return;
                 }
 
-                let y_min = ground.min_level(pts.iter().cloned()).unwrap();
-                let roof_y = ground.max_level(pts.iter().cloned()).unwrap() + 5;
+                let floor_area: Vec<(i32, i32)> =
+                    flood_fill_area(&polygon_coords, args.timeout.as_ref());
 
                 // Fill the floor area
                 for (x, z) in floor_area.iter() {
-                    editor.set_block(ground_block, *x, y_min, *z, None, None);
+                    editor.set_block(ground_block, *x, 0, *z, None, None);
                 }
 
-                // Place fences and roof slabs at each corner node directly
+                // Place fences and roof slabs at each corner node
                 for node in element.nodes() {
                     let x: i32 = node.x;
                     let z: i32 = node.z;
 
-                    let pt = XZPoint::new(x, z);
-
-                    let y = ground.level(pt);
-                    editor.set_block(ground_block, x, y, z, None, None);
-
-                    for cur_y in (y_min + 1)..roof_y {
-                        editor.set_block(OAK_FENCE, x, cur_y, z, None, None);
+                    // Set ground block and fences
+                    editor.set_block(ground_block, x, 0, z, None, None);
+                    for y in 1..=4 {
+                        editor.set_block(OAK_FENCE, x, y, z, None, None);
                     }
-                    editor.set_block(roof_block, x, roof_y, z, None, None);
+                    editor.set_block(roof_block, x, 5, z, None, None);
                 }
 
                 // Flood fill the roof area
                 for (x, z) in floor_area.iter() {
-                    editor.set_block(roof_block, *x, roof_y, *z, None, None);
+                    editor.set_block(roof_block, *x, 5, *z, None, None);
                 }
             }
             "bench" => {
                 // Place a bench
                 if let Some(pt) = first_node {
-                    let y = ground.level(pt) + 1;
-
-                    editor.set_block(SMOOTH_STONE, pt.x, y, pt.z, None, None);
-                    editor.set_block(OAK_LOG, pt.x + 1, y, pt.z, None, None);
-                    editor.set_block(OAK_LOG, pt.x - 1, y, pt.z, None, None);
-                }
-            }
-            "vending" => {
-                // Place vending machine blocks
-                if let Some(pt) = first_node {
-                    let y = ground.level(pt);
-
-                    editor.set_block(IRON_BLOCK, pt.x, y + 1, pt.z, None, None);
-                    editor.set_block(IRON_BLOCK, pt.x, y + 2, pt.z, None, None);
+                    // 50% chance to 90 degrees rotate the bench using if
+                    if rand::random::<bool>() {
+                        editor.set_block(SMOOTH_STONE, pt.x, 1, pt.z, None, None);
+                        editor.set_block(OAK_LOG, pt.x + 1, 1, pt.z, None, None);
+                        editor.set_block(OAK_LOG, pt.x - 1, 1, pt.z, None, None);
+                    } else {
+                        editor.set_block(SMOOTH_STONE, pt.x, 1, pt.z, None, None);
+                        editor.set_block(OAK_LOG, pt.x, 1, pt.z + 1, None, None);
+                        editor.set_block(OAK_LOG, pt.x, 1, pt.z - 1, None, None);
+                    }
                 }
             }
             "shelter" => {
@@ -126,24 +107,15 @@ pub fn generate_amenities(
                     let x: i32 = node.x;
                     let z: i32 = node.z;
 
-                    let Some(y) = ground.min_level(element.nodes().map(|n| n.xz())) else {
-                        return;
-                    };
-
                     for fence_height in 1..=4 {
-                        editor.set_block(OAK_FENCE, x, y + fence_height, z, None, None);
+                        editor.set_block(OAK_FENCE, x, fence_height, z, None, None);
                     }
-                    editor.set_block(roof_block, x, y + 5, z, None, None);
+                    editor.set_block(roof_block, x, 5, z, None, None);
                 }
 
                 // Flood fill the roof area
-                let Some(y) = ground.min_level(element.nodes().map(|n| n.xz())) else {
-                    return;
-                };
-
-                let roof_height: i32 = y + 5;
                 for (x, z) in roof_area.iter() {
-                    editor.set_block(roof_block, *x, roof_height, *z, None, None);
+                    editor.set_block(roof_block, *x, 5, *z, None, None);
                 }
             }
             "parking" | "fountain" => {
@@ -160,15 +132,13 @@ pub fn generate_amenities(
 
                 for node in element.nodes() {
                     let pt: XZPoint = node.xz();
-                    let y = ground.level(pt);
 
                     if let Some(prev) = previous_node {
                         // Create borders for fountain or parking area
-                        let prev_y = ground.level(prev);
                         let bresenham_points: Vec<(i32, i32, i32)> =
-                            bresenham_line(prev.x, prev_y, prev.z, pt.x, y, pt.z);
-                        for (bx, by, bz) in bresenham_points {
-                            editor.set_block(block_type, bx, by, bz, Some(&[BLACK_CONCRETE]), None);
+                            bresenham_line(prev.x, 0, prev.z, pt.x, 0, pt.z);
+                        for (bx, _, bz) in bresenham_points {
+                            editor.set_block(block_type, bx, 0, bz, Some(&[BLACK_CONCRETE]), None);
 
                             // Decorative border around fountains
                             if amenity_type == "fountain" {
@@ -178,7 +148,7 @@ pub fn generate_amenities(
                                             editor.set_block(
                                                 LIGHT_GRAY_CONCRETE,
                                                 bx + dx,
-                                                by,
+                                                0,
                                                 bz + dz,
                                                 None,
                                                 None,
@@ -204,27 +174,84 @@ pub fn generate_amenities(
                         flood_fill_area(&polygon_coords, args.timeout.as_ref());
 
                     for (x, z) in flood_area {
-                        let pt = XZPoint::new(x, z);
-                        let y = ground.level(pt);
                         editor.set_block(
                             block_type,
                             x,
-                            y,
+                            0,
                             z,
                             Some(&[BLACK_CONCRETE, GRAY_CONCRETE]),
                             None,
                         );
 
-                        // Add parking spot markings
-                        if amenity_type == "parking" && (x + z) % 8 == 0 && (x * z) % 32 != 0 {
-                            editor.set_block(
-                                LIGHT_GRAY_CONCRETE,
-                                x,
-                                y,
-                                z,
-                                Some(&[BLACK_CONCRETE, GRAY_CONCRETE]),
-                                None,
-                            );
+                        // Enhanced parking space markings
+                        if amenity_type == "parking" {
+                            // Create defined parking spaces with realistic layout
+                            let space_width = 4; // Width of each parking space
+                            let space_length = 6; // Length of each parking space
+                            let lane_width = 5; // Width of driving lanes
+
+                            // Calculate which "zone" this coordinate falls into
+                            let zone_x = x / space_width;
+                            let zone_z = z / (space_length + lane_width);
+                            let local_x = x % space_width;
+                            let local_z = z % (space_length + lane_width);
+
+                            // Create parking space boundaries (only within parking areas, not in driving lanes)
+                            if local_z < space_length {
+                                // We're in a parking space area, not in the driving lane
+                                if local_x == 0 {
+                                    // Vertical parking space lines (only on the left edge)
+                                    editor.set_block(
+                                        LIGHT_GRAY_CONCRETE,
+                                        x,
+                                        0,
+                                        z,
+                                        Some(&[BLACK_CONCRETE, GRAY_CONCRETE]),
+                                        None,
+                                    );
+                                } else if local_z == 0 {
+                                    // Horizontal parking space lines (only on the top edge)
+                                    editor.set_block(
+                                        LIGHT_GRAY_CONCRETE,
+                                        x,
+                                        0,
+                                        z,
+                                        Some(&[BLACK_CONCRETE, GRAY_CONCRETE]),
+                                        None,
+                                    );
+                                }
+                            } else if local_z == space_length {
+                                // Bottom edge of parking spaces (border with driving lane)
+                                editor.set_block(
+                                    LIGHT_GRAY_CONCRETE,
+                                    x,
+                                    0,
+                                    z,
+                                    Some(&[BLACK_CONCRETE, GRAY_CONCRETE]),
+                                    None,
+                                );
+                            } else if local_z > space_length && local_z < space_length + lane_width
+                            {
+                                // Driving lane - use darker concrete
+                                editor.set_block(
+                                    BLACK_CONCRETE,
+                                    x,
+                                    0,
+                                    z,
+                                    Some(&[GRAY_CONCRETE]),
+                                    None,
+                                );
+                            }
+
+                            // Add light posts at parking space outline corners
+                            if local_x == 0 && local_z == 0 && zone_x % 3 == 0 && zone_z % 2 == 0 {
+                                // Light posts at regular intervals on parking space corners
+                                editor.set_block(COBBLESTONE_WALL, x, 1, z, None, None);
+                                for dy in 2..=4 {
+                                    editor.set_block(OAK_FENCE, x, dy, z, None, None);
+                                }
+                                editor.set_block(GLOWSTONE, x, 5, z, None, None);
+                            }
                         }
                     }
                 }

src/element_processing/barriers.rs

@@ -1,29 +1,17 @@
 use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
-use crate::cartesian::XZPoint;
-use crate::ground::Ground;
-use crate::osm_parser::ProcessedElement;
+use crate::osm_parser::{ProcessedElement, ProcessedNode};
 use crate::world_editor::WorldEditor;
 
-pub fn generate_barriers(editor: &mut WorldEditor, element: &ProcessedElement, ground: &Ground) {
+pub fn generate_barriers(editor: &mut WorldEditor, element: &ProcessedElement) {
     // Default values
     let mut barrier_material: Block = COBBLESTONE_WALL;
     let mut barrier_height: i32 = 2;
 
     match element.tags().get("barrier").map(|s| s.as_str()) {
         Some("bollard") => {
-            if let ProcessedElement::Node(node) = element {
-                editor.set_block(
-                    COBBLESTONE_WALL,
-                    node.x,
-                    ground.level(node.xz()) + 1,
-                    node.z,
-                    None,
-                    None,
-                );
-                // Place bollard
-            }
-            return;
+            barrier_material = COBBLESTONE_WALL;
+            barrier_height = 1;
         }
         Some("kerb") => {
             // Ignore kerbs
@@ -40,8 +28,11 @@ pub fn generate_barriers(editor: &mut WorldEditor, element: &ProcessedElement, g
                     barrier_material = STONE_BRICK_WALL;
                     barrier_height = 1;
                 }
-                Some("chain_link" | "metal" | "wire" | "barbed_wire" | "corrugated_metal") => {
-                    barrier_material = STONE_BRICK_WALL;
+                Some(
+                    "chain_link" | "metal" | "wire" | "barbed_wire" | "corrugated_metal"
+                    | "electric" | "metal_bars",
+                ) => {
+                    barrier_material = STONE_BRICK_WALL; // IRON_BARS
                     barrier_height = 2;
                 }
                 Some("slatted" | "paling") => {
@@ -52,8 +43,8 @@ pub fn generate_barriers(editor: &mut WorldEditor, element: &ProcessedElement, g
                     barrier_material = OAK_FENCE;
                     barrier_height = 2;
                 }
-                Some("concrete") => {
-                    barrier_material = ANDESITE_WALL;
+                Some("concrete" | "stone") => {
+                    barrier_material = STONE_BRICK_WALL;
                     barrier_height = 2;
                 }
                 Some("glass") => {
@@ -63,6 +54,10 @@ pub fn generate_barriers(editor: &mut WorldEditor, element: &ProcessedElement, g
                 _ => {}
             }
         }
+        Some("wall") => {
+            barrier_material = STONE_BRICK_WALL;
+            barrier_height = 3;
+        }
         _ => {}
     }
     // Tagged material takes priority over inferred
@@ -70,6 +65,12 @@ pub fn generate_barriers(editor: &mut WorldEditor, element: &ProcessedElement, g
         if barrier_mat == "brick" {
             barrier_material = BRICK;
         }
+        if barrier_mat == "concrete" {
+            barrier_material = LIGHT_GRAY_CONCRETE;
+        }
+        if barrier_mat == "metal" {
+            barrier_material = STONE_BRICK_WALL; // IRON_BARS
+        }
     }
 
     if let ProcessedElement::Way(way) = element {
@@ -78,7 +79,7 @@ pub fn generate_barriers(editor: &mut WorldEditor, element: &ProcessedElement, g
             .tags()
             .get("height")
             .and_then(|height: &String| height.parse::<f32>().ok())
-            .map(|height: f32| f32::min(3.0, height).round() as i32)
+            .map(|height: f32| height.round() as i32)
             .unwrap_or(barrier_height);
 
         // Process nodes to create the barrier wall
@@ -96,24 +97,75 @@ pub fn generate_barriers(editor: &mut WorldEditor, element: &ProcessedElement, g
 
             for (bx, _, bz) in bresenham_points {
                 // Build the barrier wall to the specified height
-                let ground_level = ground.level(XZPoint::new(bx, bz));
-                for y in (ground_level + 1)..=(ground_level + wall_height) {
+                for y in 1..=wall_height {
                     editor.set_block(barrier_material, bx, y, bz, None, None);
-                    // Barrier wall
                 }
 
                 // Add an optional top to the barrier if the height is more than 1
                 if wall_height > 1 {
-                    editor.set_block(
-                        STONE_BRICK_SLAB,
-                        bx,
-                        ground_level + wall_height + 1,
-                        bz,
-                        None,
-                        None,
-                    ); // Top of the barrier
+                    editor.set_block(STONE_BRICK_SLAB, bx, wall_height + 1, bz, None, None);
                 }
             }
         }
     }
 }
+
+pub fn generate_barrier_nodes(editor: &mut WorldEditor<'_>, node: &ProcessedNode) {
+    match node.tags.get("barrier").map(|s| s.as_str()) {
+        Some("bollard") => {
+            editor.set_block(COBBLESTONE_WALL, node.x, 1, node.z, None, None);
+        }
+        Some("stile" | "gate" | "swing_gate" | "lift_gate") => {
+            /*editor.set_block(
+                OAK_TRAPDOOR,
+                node.x,
+                1,
+                node.z,
+                Some(&[
+                    COBBLESTONE_WALL,
+                    OAK_FENCE,
+                    STONE_BRICK_WALL,
+                    OAK_LEAVES,
+                    STONE_BRICK_SLAB,
+                ]),
+                None,
+            );
+            editor.set_block(
+                AIR,
+                node.x,
+                2,
+                node.z,
+                Some(&[
+                    COBBLESTONE_WALL,
+                    OAK_FENCE,
+                    STONE_BRICK_WALL,
+                    OAK_LEAVES,
+                    STONE_BRICK_SLAB,
+                ]),
+                None,
+            );
+            editor.set_block(
+                AIR,
+                node.x,
+                3,
+                node.z,
+                Some(&[
+                    COBBLESTONE_WALL,
+                    OAK_FENCE,
+                    STONE_BRICK_WALL,
+                    OAK_LEAVES,
+                    STONE_BRICK_SLAB,
+                ]),
+                None,
+            );*/
+        }
+        Some("block") => {
+            editor.set_block(STONE, node.x, 1, node.z, None, None);
+        }
+        Some("entrance") => {
+            editor.set_block(AIR, node.x, 1, node.z, None, None);
+        }
+        None => {}
+        _ => {}
+    }
+}

src/element_processing/bridges.rs

@@ -1,19 +1,18 @@
 use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
-//use crate::ground::Ground;
 use crate::osm_parser::ProcessedWay;
 use crate::world_editor::WorldEditor;
 
 // TODO FIX
 #[allow(dead_code)]
-pub fn generate_bridges(editor: &mut WorldEditor, element: &ProcessedWay, ground_level: i32) {
+pub fn generate_bridges(editor: &mut WorldEditor, element: &ProcessedWay) {
     if let Some(_bridge_type) = element.tags.get("bridge") {
         let bridge_height = 3; // Fixed height
 
         for i in 1..element.nodes.len() {
             let prev = &element.nodes[i - 1];
             let cur = &element.nodes[i];
-            let points = bresenham_line(prev.x, ground_level, prev.z, cur.x, ground_level, cur.z);
+            let points = bresenham_line(prev.x, 0, prev.z, cur.x, 0, cur.z);
 
             let total_length = points.len();
             let ramp_length = 6; // Length of ramp at each end
@@ -30,11 +29,9 @@ pub fn generate_bridges(editor: &mut WorldEditor, element: &ProcessedWay, ground
                     bridge_height
                 };
 
-                let bridge_y = ground_level + height as i32;
-
                 // Place bridge blocks
                 for dx in -2..=2 {
-                    editor.set_block(LIGHT_GRAY_CONCRETE, *x + dx, bridge_y, *z, None, None);
+                    editor.set_block(LIGHT_GRAY_CONCRETE, *x + dx, height as i32, *z, None, None);
                 }
             }
         }

src/element_processing/doors.rs

@@ -1,10 +1,8 @@
 use crate::block_definitions::*;
-use crate::cartesian::XZPoint;
-use crate::ground::Ground;
 use crate::osm_parser::ProcessedNode;
 use crate::world_editor::WorldEditor;
 
-pub fn generate_doors(editor: &mut WorldEditor, element: &ProcessedNode, ground: &Ground) {
+pub fn generate_doors(editor: &mut WorldEditor, element: &ProcessedNode) {
     // Check if the element is a door or entrance
     if element.tags.contains_key("door") || element.tags.contains_key("entrance") {
         // Check for the "level" tag and skip doors that are not at ground level
@@ -19,12 +17,9 @@ pub fn generate_doors(editor: &mut WorldEditor, element: &ProcessedNode, ground:
         let x: i32 = element.x;
         let z: i32 = element.z;
 
-        // Calculate the dynamic ground level
-        let ground_level = ground.level(XZPoint::new(x, z));
-
         // Set the ground block and the door blocks
-        editor.set_block(GRAY_CONCRETE, x, ground_level, z, None, None);
-        editor.set_block(DARK_OAK_DOOR_LOWER, x, ground_level + 1, z, None, None);
-        editor.set_block(DARK_OAK_DOOR_UPPER, x, ground_level + 2, z, None, None);
+        editor.set_block(GRAY_CONCRETE, x, 0, z, None, None);
+        editor.set_block(DARK_OAK_DOOR_LOWER, x, 1, z, None, None);
+        editor.set_block(DARK_OAK_DOOR_UPPER, x, 2, z, None, None);
     }
 }

src/element_processing/highways.rs

@@ -1,29 +1,83 @@
 use crate::args::Args;
 use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
-use crate::cartesian::XZPoint;
+use crate::coordinate_system::cartesian::XZPoint;
 use crate::floodfill::flood_fill_area;
-use crate::ground::Ground;
 use crate::osm_parser::{ProcessedElement, ProcessedWay};
 use crate::world_editor::WorldEditor;
+use std::collections::HashMap;
 
+/// Type alias for highway connectivity map
+pub type HighwayConnectivityMap = HashMap<(i32, i32), Vec<i32>>;
+
+/// Generates highways with elevation support based on layer tags and connectivity analysis
 pub fn generate_highways(
     editor: &mut WorldEditor,
     element: &ProcessedElement,
-    ground: &Ground,
     args: &Args,
+    highway_connectivity: &HighwayConnectivityMap,
+) {
+    generate_highways_internal(editor, element, args, highway_connectivity);
+}
+
+/// Build a connectivity map for highway endpoints to determine where slopes are needed.
+pub fn build_highway_connectivity_map(elements: &[ProcessedElement]) -> HighwayConnectivityMap {
+    let mut connectivity_map: HashMap<(i32, i32), Vec<i32>> = HashMap::new();
+
+    for element in elements {
+        if let ProcessedElement::Way(way) = element {
+            if way.tags.contains_key("highway") {
+                let layer_value = way
+                    .tags
+                    .get("layer")
+                    .and_then(|layer| layer.parse::<i32>().ok())
+                    .unwrap_or(0);
+
+                // Treat negative layers as ground level (0) for connectivity
+                let layer_value = if layer_value < 0 { 0 } else { layer_value };
+
+                // Add connectivity for start and end nodes
+                if !way.nodes.is_empty() {
+                    let start_node = &way.nodes[0];
+                    let end_node = &way.nodes[way.nodes.len() - 1];
+
+                    let start_coord = (start_node.x, start_node.z);
+                    let end_coord = (end_node.x, end_node.z);
+
+                    connectivity_map
+                        .entry(start_coord)
+                        .or_default()
+                        .push(layer_value);
+                    connectivity_map
+                        .entry(end_coord)
+                        .or_default()
+                        .push(layer_value);
+                }
+            }
+        }
+    }
+
+    connectivity_map
+}
+
+/// Internal function that generates highways with connectivity context for elevation handling
+fn generate_highways_internal(
+    editor: &mut WorldEditor,
+    element: &ProcessedElement,
+    args: &Args,
+    highway_connectivity: &HashMap<(i32, i32), Vec<i32>>, // Maps node coordinates to list of layers that connect to this node
 ) {
     if let Some(highway_type) = element.tags().get("highway") {
         if highway_type == "street_lamp" {
             // Handle street lamps
             if let ProcessedElement::Node(first_node) = element {
                 let x: i32 = first_node.x;
-                let y: i32 = ground.level(first_node.xz());
                 let z: i32 = first_node.z;
-                for dy in 1..=4 {
-                    editor.set_block(OAK_FENCE, x, y + dy, z, None, None);
+                editor.set_block(COBBLESTONE_WALL, x, 1, z, None, None);
+                for dy in 2..=4 {
+                    editor.set_block(OAK_FENCE, x, dy, z, None, None);
                 }
-                editor.set_block(GLOWSTONE, x, y + 5, z, None, None);
+                editor.set_block(GLOWSTONE, x, 5, z, None, None);
             }
         } else if highway_type == "crossing" {
             // Handle traffic signals for crossings
@@ -31,20 +85,15 @@ pub fn generate_highways(
                 if crossing_type == "traffic_signals" {
                     if let ProcessedElement::Node(node) = element {
                         let x: i32 = node.x;
-                        let y: i32 = ground.level(node.xz());
                         let z: i32 = node.z;
 
                         for dy in 1..=3 {
-                            editor.set_block(COBBLESTONE_WALL, x, y + dy, z, None, None);
+                            editor.set_block(COBBLESTONE_WALL, x, dy, z, None, None);
                         }
 
-                        editor.set_block(GREEN_WOOL, x, y + 4, z, None, None);
-                        editor.set_block(YELLOW_WOOL, x, y + 5, z, None, None);
-                        editor.set_block(RED_WOOL, x, y + 6, z, None, None);
-
-                        if args.winter {
-                            editor.set_block(SNOW_LAYER, x, y + 7, z, None, None);
-                        }
+                        editor.set_block(GREEN_WOOL, x, 4, z, None, None);
+                        editor.set_block(YELLOW_WOOL, x, 5, z, None, None);
+                        editor.set_block(RED_WOOL, x, 6, z, None, None);
                     }
                 }
             }
@@ -52,14 +101,13 @@ pub fn generate_highways(
             // Handle bus stops
             if let ProcessedElement::Node(node) = element {
                 let x = node.x;
-                let y = ground.level(node.xz());
                 let z = node.z;
                 for dy in 1..=3 {
-                    editor.set_block(COBBLESTONE_WALL, x, y + dy, z, None, None);
+                    editor.set_block(COBBLESTONE_WALL, x, dy, z, None, None);
                 }
 
-                editor.set_block(WHITE_WOOL, x, y + 4, z, None, None);
-                editor.set_block(WHITE_WOOL, x + 1, y + 4, z, None, None);
+                editor.set_block(WHITE_WOOL, x, 4, z, None, None);
+                editor.set_block(WHITE_WOOL, x + 1, 4, z, None, None);
             }
         } else if element
             .tags()
@@ -81,14 +129,8 @@ pub fn generate_highways(
                     "wood" => OAK_PLANKS,
                     "asphalt" => BLACK_CONCRETE,
                     "gravel" | "fine_gravel" => GRAVEL,
-                    "grass" => {
-                        if args.winter {
-                            SNOW_BLOCK
-                        } else {
-                            GRASS_BLOCK
-                        }
-                    }
-                    "dirt" => DIRT,
+                    "grass" => GRASS_BLOCK,
+                    "dirt" | "ground" | "earth" => DIRT,
                     "sand" => SAND,
                     "concrete" => LIGHT_GRAY_CONCRETE,
                     _ => STONE, // Default to stone for unknown surfaces
@@ -105,28 +147,27 @@ pub fn generate_highways(
                 flood_fill_area(&polygon_coords, args.timeout.as_ref());
 
             for (x, z) in filled_area {
-                editor.set_block(
-                    surface_block,
-                    x,
-                    ground.level(XZPoint::new(x, z)),
-                    z,
-                    None,
-                    None,
-                );
+                editor.set_block(surface_block, x, 0, z, None, None);
             }
         } else {
             let mut previous_node: Option<(i32, i32)> = None;
             let mut block_type = BLACK_CONCRETE;
             let mut block_range: i32 = 2;
             let mut add_stripe = false;
+            let mut add_outline = false;
+            let scale_factor = args.scale;
 
-            // Skip if 'layer' or 'level' is negative in the tags
-            if let Some(layer) = element.tags().get("layer") {
-                if layer.parse::<i32>().unwrap_or(0) < 0 {
-                    return;
-                }
-            }
+            // Parse the layer value for elevation calculation
+            let layer_value = element
+                .tags()
+                .get("layer")
+                .and_then(|layer| layer.parse::<i32>().ok())
+                .unwrap_or(0);
 
+            // Treat negative layers as ground level (0)
+            let layer_value = if layer_value < 0 { 0 } else { layer_value };
+
+            // Skip if 'level' is negative in the tags (indoor mapping)
             if let Some(level) = element.tags().get("level") {
                 if level.parse::<i32>().unwrap_or(0) < 0 {
                     return;
@@ -140,13 +181,17 @@ pub fn generate_highways(
                     block_range = 1;
                 }
                 "path" => {
-                    block_type = LIGHT_GRAY_CONCRETE;
+                    block_type = DIRT_PATH;
                     block_range = 1;
                 }
-                "motorway" | "primary" => {
+                "motorway" | "primary" | "trunk" => {
                     block_range = 5;
                     add_stripe = true;
                 }
+                "secondary" => {
+                    block_range = 4;
+                    add_stripe = true;
+                }
                 "tertiary" => {
                     add_stripe = true;
                 }
@@ -157,14 +202,32 @@ pub fn generate_highways(
                     block_type = GRAY_CONCRETE;
                     block_range = 2;
                 }
+                "secondary_link" | "tertiary_link" => {
+                    //Exit ramps, sliproads
+                    block_type = BLACK_CONCRETE;
+                    block_range = 1;
+                }
+                "escape" => {
+                    // Sand trap for vehicles on mountainous roads
+                    block_type = SAND;
+                    block_range = 1;
+                }
+                "steps" => {
+                    //TODO: Add correct stairs respecting height, step_count, etc.
+                    block_type = GRAY_CONCRETE;
+                    block_range = 1;
+                }
+
                 _ => {
                     if let Some(lanes) = element.tags().get("lanes") {
                         if lanes == "2" {
                             block_range = 3;
                             add_stripe = true;
+                            add_outline = true;
                         } else if lanes != "1" {
                             block_range = 4;
                             add_stripe = true;
+                            add_outline = true;
                         }
                     }
                 }
@@ -174,7 +237,44 @@ pub fn generate_highways(
                 return;
             };
 
+            if scale_factor < 1.0 {
+                block_range = ((block_range as f64) * scale_factor).floor() as i32;
+            }
+
+            // Calculate elevation based on layer
+            const LAYER_HEIGHT_STEP: i32 = 6; // Each layer is 6 blocks higher/lower
+            let base_elevation = layer_value * LAYER_HEIGHT_STEP;
+
+            // Check if we need slopes at start and end
+            let needs_start_slope =
+                should_add_slope_at_node(&way.nodes[0], layer_value, highway_connectivity);
+            let needs_end_slope = should_add_slope_at_node(
+                &way.nodes[way.nodes.len() - 1],
+                layer_value,
+                highway_connectivity,
+            );
+
+            // Calculate total way length for slope distribution
+            let total_way_length = calculate_way_length(way);
+
+            // Check if this is a short isolated elevated segment - if so, treat as ground level
+            let is_short_isolated_elevated =
+                needs_start_slope && needs_end_slope && layer_value > 0 && total_way_length <= 35;
+
+            // Override elevation and slopes for short isolated segments
+            let (effective_elevation, effective_start_slope, effective_end_slope) =
+                if is_short_isolated_elevated {
+                    (0, false, false) // Treat as ground level
+                } else {
+                    (base_elevation, needs_start_slope, needs_end_slope)
+                };
+
+            let slope_length = (total_way_length as f32 * 0.35).clamp(15.0, 50.0) as usize; // 35% of way length, max 50 blocks, min 15 blocks
+
             // Iterate over nodes to create the highway
+            let mut segment_index = 0;
+            let total_segments = way.nodes.len() - 1;
+
             for node in &way.nodes {
                 if let Some(prev) = previous_node {
                     let (x1, z1) = prev;
@@ -182,17 +282,30 @@ pub fn generate_highways(
                     let z2: i32 = node.z;
 
                     // Generate the line of coordinates between the two nodes
-                    // we don't care about the y because it's going to get overwritten
-                    // I'm not sure if we'll keep it this way
                     let bresenham_points: Vec<(i32, i32, i32)> =
                         bresenham_line(x1, 0, z1, x2, 0, z2);
 
+                    // Calculate elevation for this segment
+                    let segment_length = bresenham_points.len();
+
                     // Variables to manage dashed line pattern
                     let mut stripe_length: i32 = 0;
-                    let dash_length: i32 = 5; // Length of the solid part of the stripe
-                    let gap_length: i32 = 5; // Length of the gap part of the stripe
+                    let dash_length: i32 = (5.0 * scale_factor).ceil() as i32;
+                    let gap_length: i32 = (5.0 * scale_factor).ceil() as i32;
+
+                    for (point_index, (x, _, z)) in bresenham_points.iter().enumerate() {
+                        // Calculate Y elevation for this point based on slopes and layer
+                        let current_y = calculate_point_elevation(
+                            segment_index,
+                            point_index,
+                            segment_length,
+                            total_segments,
+                            effective_elevation,
+                            effective_start_slope,
+                            effective_end_slope,
+                            slope_length,
+                        );
 
-                    for (x, _, z) in bresenham_points {
                         // Draw the road surface for the entire width
                         for dx in -block_range..=block_range {
                             for dz in -block_range..=block_range {
@@ -210,7 +323,7 @@ pub fn generate_highways(
                                             editor.set_block(
                                                 WHITE_CONCRETE,
                                                 set_x,
-                                                ground.level(XZPoint::new(set_x, set_z)),
+                                                current_y,
                                                 set_z,
                                                 Some(&[BLACK_CONCRETE]),
                                                 None,
@@ -219,7 +332,7 @@ pub fn generate_highways(
                                             editor.set_block(
                                                 BLACK_CONCRETE,
                                                 set_x,
-                                                ground.level(XZPoint::new(set_x, set_z)),
+                                                current_y,
                                                 set_z,
                                                 None,
                                                 None,
@@ -229,7 +342,7 @@ pub fn generate_highways(
                                         editor.set_block(
                                             WHITE_CONCRETE,
                                             set_x,
-                                            ground.level(XZPoint::new(set_x, set_z)),
+                                            current_y,
                                             set_z,
                                             Some(&[BLACK_CONCRETE]),
                                             None,
@@ -238,7 +351,7 @@ pub fn generate_highways(
                                         editor.set_block(
                                             BLACK_CONCRETE,
                                             set_x,
-                                            ground.level(XZPoint::new(set_x, set_z)),
+                                            current_y,
                                             set_z,
                                             None,
                                             None,
@@ -248,24 +361,80 @@ pub fn generate_highways(
                                     editor.set_block(
                                         block_type,
                                         set_x,
-                                        ground.level(XZPoint::new(set_x, set_z)),
+                                        current_y,
                                         set_z,
                                         None,
                                         Some(&[BLACK_CONCRETE, WHITE_CONCRETE]),
                                     );
                                 }
+
+                                // Add stone brick foundation underneath elevated highways for thickness
+                                if effective_elevation > 0 && current_y > 0 {
+                                    // Add 1 layer of stone bricks underneath the highway surface
+                                    editor.set_block(
+                                        STONE_BRICKS,
+                                        set_x,
+                                        current_y - 1,
+                                        set_z,
+                                        None,
+                                        None,
+                                    );
+                                }
+
+                                // Add support pillars for elevated highways
+                                if effective_elevation != 0 && current_y > 0 {
+                                    add_highway_support_pillar(
+                                        editor,
+                                        set_x,
+                                        current_y,
+                                        set_z,
+                                        dx,
+                                        dz,
+                                        block_range,
+                                    );
+                                }
+                            }
+                        }
+
+                        // Add light gray concrete outline for multi-lane roads
+                        if add_outline {
+                            // Left outline
+                            for dz in -block_range..=block_range {
+                                let outline_x = x - block_range - 1;
+                                let outline_z = z + dz;
+                                editor.set_block(
+                                    LIGHT_GRAY_CONCRETE,
+                                    outline_x,
+                                    current_y,
+                                    outline_z,
+                                    None,
+                                    None,
+                                );
+                            }
+                            // Right outline
+                            for dz in -block_range..=block_range {
+                                let outline_x = x + block_range + 1;
+                                let outline_z = z + dz;
+                                editor.set_block(
+                                    LIGHT_GRAY_CONCRETE,
+                                    outline_x,
+                                    current_y,
+                                    outline_z,
+                                    None,
+                                    None,
+                                );
                             }
                         }
 
                         // Add a dashed white line in the middle for larger roads
                         if add_stripe {
                             if stripe_length < dash_length {
-                                let stripe_x: i32 = x;
-                                let stripe_z: i32 = z;
+                                let stripe_x: i32 = *x;
+                                let stripe_z: i32 = *z;
                                 editor.set_block(
                                     WHITE_CONCRETE,
                                     stripe_x,
-                                    ground.level(XZPoint::new(stripe_x, stripe_z)),
+                                    current_y,
                                     stripe_z,
                                     Some(&[BLACK_CONCRETE]),
                                     None,
@@ -279,6 +448,8 @@ pub fn generate_highways(
                             }
                         }
                     }
+
+                    segment_index += 1;
                 }
                 previous_node = Some((node.x, node.z));
             }
@@ -286,8 +457,133 @@ pub fn generate_highways(
     }
 }
 
+/// Helper function to determine if a slope should be added at a specific node
+fn should_add_slope_at_node(
+    node: &crate::osm_parser::ProcessedNode,
+    current_layer: i32,
+    highway_connectivity: &HashMap<(i32, i32), Vec<i32>>,
+) -> bool {
+    let node_coord = (node.x, node.z);
+
+    // If we don't have connectivity information, always add slopes for non-zero layers
+    if highway_connectivity.is_empty() {
+        return current_layer != 0;
+    }
+
+    // Check if there are other highways at different layers connected to this node
+    if let Some(connected_layers) = highway_connectivity.get(&node_coord) {
+        // Count how many ways are at the same layer as current way
+        let same_layer_count = connected_layers
+            .iter()
+            .filter(|&&layer| layer == current_layer)
+            .count();
+
+        // If this is the only way at this layer connecting to this node, we need a slope
+        // (unless we're at ground level and connecting to ground level ways)
+        if same_layer_count <= 1 {
+            return current_layer != 0;
+        }
+
+        // If there are multiple ways at the same layer, don't add slope
+        false
+    } else {
+        // No other highways connected, add slope if not at ground level
+        current_layer != 0
+    }
+}
+
+/// Helper function to calculate the total length of a way in blocks
+fn calculate_way_length(way: &ProcessedWay) -> usize {
+    let mut total_length = 0;
+    let mut previous_node: Option<&crate::osm_parser::ProcessedNode> = None;
+
+    for node in &way.nodes {
+        if let Some(prev) = previous_node {
+            let dx = (node.x - prev.x).abs();
+            let dz = (node.z - prev.z).abs();
+            total_length += ((dx * dx + dz * dz) as f32).sqrt() as usize;
+        }
+        previous_node = Some(node);
+    }
+
+    total_length
+}
+
+/// Calculate the Y elevation for a specific point along the highway
+#[allow(clippy::too_many_arguments)]
+fn calculate_point_elevation(
+    segment_index: usize,
+    point_index: usize,
+    segment_length: usize,
+    total_segments: usize,
+    base_elevation: i32,
+    needs_start_slope: bool,
+    needs_end_slope: bool,
+    slope_length: usize,
+) -> i32 {
+    // If no slopes needed, return base elevation
+    if !needs_start_slope && !needs_end_slope {
+        return base_elevation;
+    }
+
+    // Calculate total distance from start
+    let total_distance_from_start = segment_index * segment_length + point_index;
+    let total_way_length = total_segments * segment_length;
+
+    // Ensure we have reasonable values
+    if total_way_length == 0 || slope_length == 0 {
+        return base_elevation;
+    }
+
+    // Start slope calculation - gradual rise from ground level
+    if needs_start_slope && total_distance_from_start <= slope_length {
+        let slope_progress = total_distance_from_start as f32 / slope_length as f32;
+        let elevation_offset = (base_elevation as f32 * slope_progress) as i32;
+        return elevation_offset;
+    }
+
+    // End slope calculation - gradual descent to ground level
+    if needs_end_slope
+        && total_distance_from_start >= (total_way_length.saturating_sub(slope_length))
+    {
+        let distance_from_end = total_way_length - total_distance_from_start;
+        let slope_progress = distance_from_end as f32 / slope_length as f32;
+        let elevation_offset = (base_elevation as f32 * slope_progress) as i32;
+        return elevation_offset;
+    }
+
+    // Middle section at full elevation
+    base_elevation
+}
+
+/// Add support pillars for elevated highways
+fn add_highway_support_pillar(
+    editor: &mut WorldEditor,
+    x: i32,
+    highway_y: i32,
+    z: i32,
+    dx: i32,
+    dz: i32,
+    _block_range: i32, // Keep for future use
+) {
+    // Only add pillars at specific intervals and positions
+    if dx == 0 && dz == 0 && (x + z) % 8 == 0 {
+        // Add pillar from ground to highway level
+        for y in 1..highway_y {
+            editor.set_block(STONE_BRICKS, x, y, z, None, None);
+        }
+
+        // Add pillar base
+        for base_dx in -1..=1 {
+            for base_dz in -1..=1 {
+                editor.set_block(STONE_BRICKS, x + base_dx, 0, z + base_dz, None, None);
+            }
+        }
+    }
+}
+
 /// Generates a siding using stone brick slabs
-pub fn generate_siding(editor: &mut WorldEditor, element: &ProcessedWay, ground: &Ground) {
+pub fn generate_siding(editor: &mut WorldEditor, element: &ProcessedWay) {
     let mut previous_node: Option<XZPoint> = None;
     let siding_block: Block = STONE_BRICK_SLAB;
 
@@ -306,16 +602,8 @@ pub fn generate_siding(editor: &mut WorldEditor, element: &ProcessedWay, ground:
             );
 
             for (bx, _, bz) in bresenham_points {
-                let ground_level = ground.level(XZPoint::new(bx, bz)) + 1;
-
-                if !editor.check_for_block(
-                    bx,
-                    ground_level - 1,
-                    bz,
-                    None,
-                    Some(&[BLACK_CONCRETE, WHITE_CONCRETE]),
-                ) {
-                    editor.set_block(siding_block, bx, ground_level, bz, None, None);
+                if !editor.check_for_block(bx, 0, bz, Some(&[BLACK_CONCRETE, WHITE_CONCRETE])) {
+                    editor.set_block(siding_block, bx, 1, bz, None, None);
                 }
             }
         }
@@ -325,7 +613,7 @@ pub fn generate_siding(editor: &mut WorldEditor, element: &ProcessedWay, ground:
 }
 
 /// Generates an aeroway
-pub fn generate_aeroway(editor: &mut WorldEditor, way: &ProcessedWay, ground: &Ground) {
+pub fn generate_aeroway(editor: &mut WorldEditor, way: &ProcessedWay, args: &Args) {
     let mut previous_node: Option<(i32, i32)> = None;
     let surface_block = LIGHT_GRAY_CONCRETE;
 
@@ -335,14 +623,14 @@ pub fn generate_aeroway(editor: &mut WorldEditor, way: &ProcessedWay, ground: &G
             let x2 = node.x;
             let z2 = node.z;
             let points = bresenham_line(x1, 0, z1, x2, 0, z2);
+            let way_width: i32 = (12.0 * args.scale).ceil() as i32;
 
             for (x, _, z) in points {
-                for dx in -12..=12 {
-                    for dz in -12..=12 {
+                for dx in -way_width..=way_width {
+                    for dz in -way_width..=way_width {
                         let set_x = x + dx;
                         let set_z = z + dz;
-                        let y = ground.level(XZPoint::new(set_x, set_z));
-                        editor.set_block(surface_block, set_x, y, set_z, None, None);
+                        editor.set_block(surface_block, set_x, 0, set_z, None, None);
                     }
                 }
             }

src/element_processing/landuse.rs

@@ -1,56 +1,47 @@
 use crate::args::Args;
 use crate::block_definitions::*;
-use crate::cartesian::XZPoint;
-use crate::element_processing::tree::create_tree;
+use crate::element_processing::tree::Tree;
 use crate::floodfill::flood_fill_area;
-use crate::ground::Ground;
-use crate::osm_parser::ProcessedWay;
+use crate::osm_parser::{ProcessedMemberRole, ProcessedRelation, ProcessedWay};
 use crate::world_editor::WorldEditor;
 use rand::Rng;
 
-pub fn generate_landuse(
-    editor: &mut WorldEditor,
-    element: &ProcessedWay,
-    ground: &Ground,
-    args: &Args,
-) {
+pub fn generate_landuse(editor: &mut WorldEditor, element: &ProcessedWay, args: &Args) {
     // Determine block type based on landuse tag
     let binding: String = "".to_string();
     let landuse_tag: &String = element.tags.get("landuse").unwrap_or(&binding);
 
     let block_type = match landuse_tag.as_str() {
-        "greenfield" | "meadow" | "grass" => {
-            if args.winter {
-                SNOW_BLOCK
-            } else {
-                GRASS_BLOCK
-            }
-        }
+        "greenfield" | "meadow" | "grass" | "orchard" | "forest" => GRASS_BLOCK,
         "farmland" => FARMLAND,
-        "forest" => {
-            if args.winter {
-                SNOW_BLOCK
-            } else {
+        "cemetery" => PODZOL,
+        "construction" => COARSE_DIRT,
+        "traffic_island" => STONE_BLOCK_SLAB,
+        "residential" => {
+            let residential_tag = element.tags.get("residential").unwrap_or(&binding);
+            if residential_tag == "rural" {
                 GRASS_BLOCK
+            } else {
+                STONE_BRICKS
             }
         }
-        "cemetery" => PODZOL,
-        "beach" => SAND,
-        "construction" => DIRT,
-        "traffic_island" => STONE_BLOCK_SLAB,
-        "residential" => STONE_BRICKS,
         "commercial" => SMOOTH_STONE,
-        "education" => LIGHT_GRAY_CONCRETE,
+        "education" => POLISHED_ANDESITE,
+        "religious" => POLISHED_ANDESITE,
         "industrial" => COBBLESTONE,
         "military" => GRAY_CONCRETE,
         "railway" => GRAVEL,
-        _ => {
-            if args.winter {
-                SNOW_BLOCK
+        "landfill" => {
+            // Gravel if man_made = spoil_heap or heap, coarse dirt else
+            let manmade_tag = element.tags.get("man_made").unwrap_or(&binding);
+            if manmade_tag == "spoil_heap" || manmade_tag == "heap" {
+                GRAVEL
             } else {
-                GRASS_BLOCK
+                COARSE_DIRT
             }
         }
+        "quarry" => STONE,
+        _ => GRASS_BLOCK,
     };
 
     // Get the area of the landuse element
@@ -60,13 +51,12 @@ pub fn generate_landuse(
     let mut rng: rand::prelude::ThreadRng = rand::thread_rng();
 
     for (x, z) in floor_area {
-        let ground_level = ground.level(XZPoint::new(x, z));
         if landuse_tag == "traffic_island" {
-            editor.set_block(block_type, x, ground_level + 1, z, None, None);
+            editor.set_block(block_type, x, 1, z, None, None);
         } else if landuse_tag == "construction" || landuse_tag == "railway" {
-            editor.set_block(block_type, x, ground_level, z, None, Some(&[SPONGE]));
+            editor.set_block(block_type, x, 0, z, None, Some(&[SPONGE]));
         } else {
-            editor.set_block(block_type, x, ground_level, z, None, None);
+            editor.set_block(block_type, x, 0, z, None, None);
         }
 
         // Add specific features for different landuse types
@@ -76,197 +66,93 @@ pub fn generate_landuse(
                     let random_choice: i32 = rng.gen_range(0..100);
                     if random_choice < 15 {
                         // Place graves
-                        if editor.check_for_block(x, ground_level, z, Some(&[PODZOL]), None) {
+                        if editor.check_for_block(x, 0, z, Some(&[PODZOL])) {
                             if rng.gen_bool(0.5) {
-                                editor.set_block(
-                                    COBBLESTONE,
-                                    x - 1,
-                                    ground_level + 1,
-                                    z,
-                                    None,
-                                    None,
-                                );
-                                editor.set_block(
-                                    STONE_BRICK_SLAB,
-                                    x - 1,
-                                    ground_level + 2,
-                                    z,
-                                    None,
-                                    None,
-                                );
-                                editor.set_block(
-                                    STONE_BRICK_SLAB,
-                                    x,
-                                    ground_level + 1,
-                                    z,
-                                    None,
-                                    None,
-                                );
-                                editor.set_block(
-                                    STONE_BRICK_SLAB,
-                                    x + 1,
-                                    ground_level + 1,
-                                    z,
-                                    None,
-                                    None,
-                                );
+                                editor.set_block(COBBLESTONE, x - 1, 1, z, None, None);
+                                editor.set_block(STONE_BRICK_SLAB, x - 1, 2, z, None, None);
+                                editor.set_block(STONE_BRICK_SLAB, x, 1, z, None, None);
+                                editor.set_block(STONE_BRICK_SLAB, x + 1, 1, z, None, None);
                             } else {
-                                editor.set_block(
-                                    COBBLESTONE,
-                                    x,
-                                    ground_level + 1,
-                                    z - 1,
-                                    None,
-                                    None,
-                                );
-                                editor.set_block(
-                                    STONE_BRICK_SLAB,
-                                    x,
-                                    ground_level + 2,
-                                    z - 1,
-                                    None,
-                                    None,
-                                );
-                                editor.set_block(
-                                    STONE_BRICK_SLAB,
-                                    x,
-                                    ground_level + 1,
-                                    z,
-                                    None,
-                                    None,
-                                );
-                                editor.set_block(
-                                    STONE_BRICK_SLAB,
-                                    x,
-                                    ground_level + 1,
-                                    z + 1,
-                                    None,
-                                    None,
-                                );
+                                editor.set_block(COBBLESTONE, x, 1, z - 1, None, None);
+                                editor.set_block(STONE_BRICK_SLAB, x, 2, z - 1, None, None);
+                                editor.set_block(STONE_BRICK_SLAB, x, 1, z, None, None);
+                                editor.set_block(STONE_BRICK_SLAB, x, 1, z + 1, None, None);
                             }
                         }
                     } else if random_choice < 30 {
-                        if editor.check_for_block(x, ground_level, z, Some(&[PODZOL]), None) {
-                            editor.set_block(RED_FLOWER, x, ground_level + 1, z, None, None);
+                        if editor.check_for_block(x, 0, z, Some(&[PODZOL])) {
+                            editor.set_block(RED_FLOWER, x, 1, z, None, None);
                         }
                     } else if random_choice < 33 {
-                        create_tree(
-                            editor,
-                            x,
-                            ground_level + 1,
-                            z,
-                            rng.gen_range(1..=3),
-                            args.winter,
-                        );
+                        Tree::create(editor, (x, 1, z));
+                    } else if random_choice < 35 {
+                        editor.set_block(OAK_LEAVES, x, 1, z, None, None);
                     }
                 }
             }
             "forest" => {
-                if !editor.check_for_block(x, ground_level, z, None, Some(&[WATER])) {
-                    let random_choice: i32 = rng.gen_range(0..21);
+                if editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                    let random_choice: i32 = rng.gen_range(0..30);
                     if random_choice == 20 {
-                        create_tree(
-                            editor,
-                            x,
-                            ground_level + 1,
-                            z,
-                            rng.gen_range(1..=3),
-                            args.winter,
-                        );
+                        Tree::create(editor, (x, 1, z));
                     } else if random_choice == 2 {
-                        let flower_block: Block = match rng.gen_range(1..=4) {
-                            1 => RED_FLOWER,
-                            2 => BLUE_FLOWER,
-                            3 => YELLOW_FLOWER,
+                        let flower_block: Block = match rng.gen_range(1..=5) {
+                            1 => OAK_LEAVES,
+                            2 => RED_FLOWER,
+                            3 => BLUE_FLOWER,
+                            4 => YELLOW_FLOWER,
                             _ => WHITE_FLOWER,
                         };
-                        editor.set_block(flower_block, x, ground_level + 1, z, None, None);
-                    } else if random_choice <= 1 {
-                        editor.set_block(GRASS, x, ground_level + 1, z, None, None);
+                        editor.set_block(flower_block, x, 1, z, None, None);
+                    } else if random_choice <= 12 {
+                        editor.set_block(GRASS, x, 1, z, None, None);
                     }
                 }
             }
             "farmland" => {
                 // Check if the current block is not water or another undesired block
-                if !editor.check_for_block(x, ground_level, z, None, Some(&[WATER])) {
-                    if x % 15 == 0 || z % 15 == 0 {
-                        // Place water on the edges
-                        editor.set_block(WATER, x, ground_level, z, Some(&[FARMLAND]), None);
-                        editor.set_block(
-                            AIR,
-                            x,
-                            ground_level + 1,
-                            z,
-                            Some(&[GRASS, WHEAT, CARROTS, POTATOES]),
-                            None,
-                        );
-                    } else {
-                        // Set the block below as farmland
-                        editor.set_block(FARMLAND, x, ground_level, z, None, None);
-
-                        // If a random condition is met, place a special object
-                        if rng.gen_range(0..76) == 0 {
-                            let special_choice: i32 = rng.gen_range(1..=10);
-                            if special_choice <= 2 {
-                                create_tree(
-                                    editor,
-                                    x,
-                                    ground_level + 1,
-                                    z,
-                                    rng.gen_range(1..=3),
-                                    args.winter,
-                                );
-                            } else if special_choice <= 6 {
-                                editor.set_block(
-                                    HAY_BALE,
-                                    x,
-                                    ground_level + 1,
-                                    z,
-                                    None,
-                                    Some(&[SPONGE]),
-                                );
-                            } else {
-                                editor.set_block(
-                                    OAK_LEAVES,
-                                    x,
-                                    ground_level + 1,
-                                    z,
-                                    None,
-                                    Some(&[SPONGE]),
-                                );
-                            }
+                if !editor.check_for_block(x, 0, z, Some(&[WATER])) {
+                    if x % 9 == 0 && z % 9 == 0 {
+                        // Place water in dot pattern
+                        editor.set_block(WATER, x, 0, z, Some(&[FARMLAND]), None);
+                    } else if rng.gen_range(0..76) == 0 {
+                        let special_choice: i32 = rng.gen_range(1..=10);
+                        if special_choice <= 4 {
+                            editor.set_block(HAY_BALE, x, 1, z, None, Some(&[SPONGE]));
                         } else {
-                            // Set crops only if the block below is farmland
-                            if editor.check_for_block(x, ground_level, z, Some(&[FARMLAND]), None) {
-                                let crop_choice = [WHEAT, CARROTS, POTATOES][rng.gen_range(0..3)];
-                                editor.set_block(crop_choice, x, ground_level + 1, z, None, None);
-                            }
+                            editor.set_block(OAK_LEAVES, x, 1, z, None, Some(&[SPONGE]));
+                        }
+                    } else {
+                        // Set crops only if the block below is farmland
+                        if editor.check_for_block(x, 0, z, Some(&[FARMLAND])) {
+                            let crop_choice = [WHEAT, CARROTS, POTATOES][rng.gen_range(0..3)];
+                            editor.set_block(crop_choice, x, 1, z, None, None);
                         }
                     }
                 }
             }
             "construction" => {
                 let random_choice: i32 = rng.gen_range(0..1501);
-                if random_choice < 6 {
-                    editor.set_block(SCAFFOLDING, x, ground_level + 1, z, None, None);
+                if random_choice < 15 {
+                    editor.set_block(SCAFFOLDING, x, 1, z, None, None);
                     if random_choice < 2 {
-                        editor.set_block(SCAFFOLDING, x, ground_level + 2, z, None, None);
-                        editor.set_block(SCAFFOLDING, x, ground_level + 3, z, None, None);
+                        editor.set_block(SCAFFOLDING, x, 2, z, None, None);
+                        editor.set_block(SCAFFOLDING, x, 3, z, None, None);
                     } else if random_choice < 4 {
-                        editor.set_block(SCAFFOLDING, x, ground_level + 2, z, None, None);
-                        editor.set_block(SCAFFOLDING, x, ground_level + 3, z, None, None);
-                        editor.set_block(SCAFFOLDING, x, ground_level + 4, z, None, None);
-                        editor.set_block(SCAFFOLDING, x, ground_level + 1, z + 1, None, None);
+                        editor.set_block(SCAFFOLDING, x, 2, z, None, None);
+                        editor.set_block(SCAFFOLDING, x, 3, z, None, None);
+                        editor.set_block(SCAFFOLDING, x, 4, z, None, None);
+                        editor.set_block(SCAFFOLDING, x, 1, z + 1, None, None);
                     } else {
-                        editor.set_block(SCAFFOLDING, x, ground_level + 2, z, None, None);
-                        editor.set_block(SCAFFOLDING, x, ground_level + 3, z, None, None);
-                        editor.set_block(SCAFFOLDING, x, ground_level + 4, z, None, None);
-                        editor.set_block(SCAFFOLDING, x, ground_level + 5, z, None, None);
-                        editor.set_block(SCAFFOLDING, x - 1, ground_level + 1, z, None, None);
-                        editor.set_block(SCAFFOLDING, x + 1, ground_level + 1, z - 1, None, None);
+                        editor.set_block(SCAFFOLDING, x, 2, z, None, None);
+                        editor.set_block(SCAFFOLDING, x, 3, z, None, None);
+                        editor.set_block(SCAFFOLDING, x, 4, z, None, None);
+                        editor.set_block(SCAFFOLDING, x, 5, z, None, None);
+                        editor.set_block(SCAFFOLDING, x - 1, 1, z, None, None);
+                        editor.set_block(SCAFFOLDING, x + 1, 1, z - 1, None, None);
                     }
-                } else if random_choice < 30 {
-                    let construction_items: [Block; 11] = [
+                } else if random_choice < 55 {
+                    let construction_items: [Block; 13] = [
                         OAK_LOG,
                         COBBLESTONE,
                         GRAVEL,
@@ -278,64 +164,105 @@ pub fn generate_landuse(
                         OAK_PLANKS,
                         DIRT,
                         BRICK,
+                        CRAFTING_TABLE,
+                        FURNACE,
                     ];
                     editor.set_block(
                         construction_items[rng.gen_range(0..construction_items.len())],
                         x,
-                        ground_level + 1,
+                        1,
                         z,
                         None,
                         None,
                     );
-                } else if random_choice < 35 {
-                    if random_choice < 30 {
-                        editor.set_block(DIRT, x, ground_level + 1, z, None, None);
-                        editor.set_block(DIRT, x, ground_level + 2, z, None, None);
-                        editor.set_block(DIRT, x + 1, ground_level + 1, z, None, None);
-                        editor.set_block(DIRT, x, ground_level + 1, z + 1, None, None);
+                } else if random_choice < 65 {
+                    if random_choice < 60 {
+                        editor.set_block(DIRT, x, 1, z, None, None);
+                        editor.set_block(DIRT, x, 2, z, None, None);
+                        editor.set_block(DIRT, x + 1, 1, z, None, None);
+                        editor.set_block(DIRT, x, 1, z + 1, None, None);
                     } else {
-                        editor.set_block(DIRT, x, ground_level + 1, z, None, None);
-                        editor.set_block(DIRT, x, ground_level + 2, z, None, None);
-                        editor.set_block(DIRT, x - 1, ground_level + 1, z, None, None);
-                        editor.set_block(DIRT, x, ground_level + 1, z - 1, None, None);
+                        editor.set_block(DIRT, x, 1, z, None, None);
+                        editor.set_block(DIRT, x, 2, z, None, None);
+                        editor.set_block(DIRT, x - 1, 1, z, None, None);
+                        editor.set_block(DIRT, x, 1, z - 1, None, None);
                     }
-                } else if random_choice < 150 {
-                    editor.set_block(AIR, x, ground_level, z, None, Some(&[SPONGE]));
+                } else if random_choice < 100 {
+                    editor.set_block(GRAVEL, x, 0, z, None, Some(&[SPONGE]));
+                } else if random_choice < 115 {
+                    editor.set_block(SAND, x, 0, z, None, Some(&[SPONGE]));
+                } else if random_choice < 125 {
+                    editor.set_block(DIORITE, x, 0, z, None, Some(&[SPONGE]));
+                } else if random_choice < 145 {
+                    editor.set_block(BRICK, x, 0, z, None, Some(&[SPONGE]));
+                } else if random_choice < 155 {
+                    editor.set_block(GRANITE, x, 0, z, None, Some(&[SPONGE]));
+                } else if random_choice < 180 {
+                    editor.set_block(ANDESITE, x, 0, z, None, Some(&[SPONGE]));
+                } else if random_choice < 565 {
+                    editor.set_block(COBBLESTONE, x, 0, z, None, Some(&[SPONGE]));
                 }
             }
             "grass" => {
-                if rng.gen_range(1..=7) != 1
-                    && editor.check_for_block(
-                        x,
-                        ground_level,
-                        z,
-                        Some(&[GRASS_BLOCK, SNOW_BLOCK]),
-                        None,
-                    )
-                {
-                    editor.set_block(GRASS, x, ground_level + 1, z, None, None);
+                if editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                    match rng.gen_range(0..200) {
+                        0 => editor.set_block(OAK_LEAVES, x, 1, z, None, None),
+                        1..=170 => editor.set_block(GRASS, x, 1, z, None, None),
+                        _ => {}
+                    }
+                }
+            }
+            "greenfield" => {
+                if editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                    match rng.gen_range(0..200) {
+                        0 => editor.set_block(OAK_LEAVES, x, 1, z, None, None),
+                        1..=17 => editor.set_block(GRASS, x, 1, z, None, None),
+                        _ => {}
+                    }
                 }
             }
             "meadow" => {
-                if editor.check_for_block(
-                    x,
-                    ground_level,
-                    z,
-                    Some(&[GRASS_BLOCK, SNOW_BLOCK]),
-                    None,
-                ) {
+                if editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
                     let random_choice: i32 = rng.gen_range(0..1001);
                     if random_choice < 5 {
-                        create_tree(
-                            editor,
-                            x,
-                            ground_level + 1,
-                            z,
-                            rng.gen_range(1..=3),
-                            args.winter,
-                        );
+                        Tree::create(editor, (x, 1, z));
+                    } else if random_choice < 6 {
+                        editor.set_block(RED_FLOWER, x, 1, z, None, None);
+                    } else if random_choice < 9 {
+                        editor.set_block(OAK_LEAVES, x, 1, z, None, None);
                     } else if random_choice < 800 {
-                        editor.set_block(GRASS, x, ground_level + 1, z, None, None);
+                        editor.set_block(GRASS, x, 1, z, None, None);
+                    }
+                }
+            }
+            "orchard" => {
+                if x % 18 == 0 && z % 10 == 0 {
+                    Tree::create(editor, (x, 1, z));
+                } else if editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                    match rng.gen_range(0..100) {
+                        0 => editor.set_block(OAK_LEAVES, x, 1, z, None, None),
+                        1..=20 => editor.set_block(GRASS, x, 1, z, None, None),
+                        _ => {}
+                    }
+                }
+            }
+            "quarry" => {
+                // Add stone layer under it
+                editor.set_block(STONE, x, -1, z, Some(&[STONE]), None);
+                editor.set_block(STONE, x, -2, z, Some(&[STONE]), None);
+                // Generate ore blocks
+                if let Some(resource) = element.tags.get("resource") {
+                    let ore_block = match resource.as_str() {
+                        "iron_ore" => IRON_ORE,
+                        "coal" => COAL_ORE,
+                        "copper" => COPPER_ORE,
+                        "gold" => GOLD_ORE,
+                        "clay" | "kaolinite" => CLAY,
+                        _ => STONE,
+                    };
+                    let random_choice: i32 = rng.gen_range(0..100 + editor.get_absolute_y(x, 0, z)); // The deeper it is the more resources are there
+                    if random_choice < 5 {
+                        editor.set_block(ore_block, x, 0, z, Some(&[STONE]), None);
                     }
                 }
             }
@@ -343,3 +270,39 @@ pub fn generate_landuse(
         }
     }
 }
+
+pub fn generate_landuse_from_relation(
+    editor: &mut WorldEditor,
+    rel: &ProcessedRelation,
+    args: &Args,
+) {
+    if rel.tags.contains_key("landuse") {
+        // Generate individual ways with their original tags
+        for member in &rel.members {
+            if member.role == ProcessedMemberRole::Outer {
+                generate_landuse(editor, &member.way.clone(), args);
+            }
+        }
+
+        // Combine all outer ways into one with relation tags
+        let mut combined_nodes = Vec::new();
+        for member in &rel.members {
+            if member.role == ProcessedMemberRole::Outer {
+                combined_nodes.extend(member.way.nodes.clone());
+            }
+        }
+
+        // Only process if we have nodes
+        if !combined_nodes.is_empty() {
+            // Create combined way with relation tags
+            let combined_way = ProcessedWay {
+                id: rel.id,
+                nodes: combined_nodes,
+                tags: rel.tags.clone(),
+            };
+
+            // Generate landuse area from combined way
+            generate_landuse(editor, &combined_way, args);
+        }
+    }
+}

src/element_processing/leisure.rs

@@ -1,20 +1,13 @@
 use crate::args::Args;
 use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
-use crate::cartesian::XZPoint;
-use crate::element_processing::tree::create_tree;
+use crate::element_processing::tree::Tree;
 use crate::floodfill::flood_fill_area;
-use crate::ground::Ground;
 use crate::osm_parser::{ProcessedMemberRole, ProcessedRelation, ProcessedWay};
 use crate::world_editor::WorldEditor;
 use rand::Rng;
 
-pub fn generate_leisure(
-    editor: &mut WorldEditor,
-    element: &ProcessedWay,
-    ground: &Ground,
-    args: &Args,
-) {
+pub fn generate_leisure(editor: &mut WorldEditor, element: &ProcessedWay, args: &Args) {
     if let Some(leisure_type) = element.tags.get("leisure") {
         let mut previous_node: Option<(i32, i32)> = None;
         let mut corner_addup: (i32, i32, i32) = (0, 0, 0);
@@ -22,40 +15,31 @@ pub fn generate_leisure(
 
         // Determine block type based on leisure type
         let block_type: Block = match leisure_type.as_str() {
-            "park" => {
-                if args.winter {
-                    SNOW_BLOCK
-                } else {
-                    GRASS_BLOCK
-                }
+            "park" | "nature_reserve" | "garden" | "disc_golf_course" | "golf_course" => {
+                GRASS_BLOCK
             }
-            "playground" | "recreation_ground" | "pitch" => {
+            "schoolyard" => BLACK_CONCRETE,
+            "playground" | "recreation_ground" | "pitch" | "beach_resort" | "dog_park" => {
                 if let Some(surface) = element.tags.get("surface") {
                     match surface.as_str() {
                         "clay" => TERRACOTTA,
                         "sand" => SAND,
                         "tartan" => RED_TERRACOTTA,
+                        "grass" => GRASS_BLOCK,
+                        "dirt" => DIRT,
+                        "pebblestone" | "cobblestone" | "unhewn_cobblestone" => COBBLESTONE,
                         _ => GREEN_STAINED_HARDENED_CLAY,
                     }
                 } else {
                     GREEN_STAINED_HARDENED_CLAY
                 }
             }
-            "garden" => {
-                if args.winter {
-                    SNOW_BLOCK
-                } else {
-                    GRASS_BLOCK
-                }
-            }
-            "swimming_pool" => WATER,
-            _ => {
-                if args.winter {
-                    SNOW_BLOCK
-                } else {
-                    GRASS_BLOCK
-                }
-            }
+            "swimming_pool" | "swimming_area" => WATER, //Swimming area: Area in a larger body of water for swimming
+            "bathing_place" => SMOOTH_SANDSTONE,        // Could be sand or concrete
+            "outdoor_seating" => SMOOTH_STONE,          //Usually stone or stone bricks
+            "water_park" | "slipway" => LIGHT_GRAY_CONCRETE, // Water park area, not the pool. Usually is concrete
+            "ice_rink" => PACKED_ICE, // TODO: Ice for Ice Rink, needs building defined
+            _ => GRASS_BLOCK,
         };
 
         // Process leisure area nodes
@@ -68,7 +52,7 @@ pub fn generate_leisure(
                     editor.set_block(
                         block_type,
                         bx,
-                        ground.level(XZPoint::new(bx, bz)),
+                        0,
                         bz,
                         Some(&[
                             GRASS_BLOCK,
@@ -101,47 +85,37 @@ pub fn generate_leisure(
                 flood_fill_area(&polygon_coords, args.timeout.as_ref());
 
             for (x, z) in filled_area {
-                let ground_level = ground.level(XZPoint::new(x, z));
-                editor.set_block(block_type, x, ground_level, z, Some(&[GRASS_BLOCK]), None);
+                editor.set_block(block_type, x, 0, z, Some(&[GRASS_BLOCK]), None);
 
                 // Add decorative elements for parks and gardens
-                if matches!(leisure_type.as_str(), "park" | "garden")
-                    && editor.check_for_block(x, ground_level, z, Some(&[GRASS_BLOCK]), None)
+                if matches!(leisure_type.as_str(), "park" | "garden" | "nature_reserve")
+                    && editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK]))
                 {
                     let mut rng: rand::prelude::ThreadRng = rand::thread_rng();
                     let random_choice: i32 = rng.gen_range(0..1000);
 
                     match random_choice {
-                        0 => {
-                            // Benches
-                            editor.set_block(OAK_LOG, x, ground_level + 1, z, None, None);
-                            editor.set_block(OAK_LOG, x + 1, ground_level + 1, z, None, None);
-                            editor.set_block(OAK_LOG, x - 1, ground_level + 1, z, None, None);
-                        }
-                        1..=30 => {
+                        0..30 => {
                             // Flowers
-                            let flower_choice = match rng.gen_range(0..4) {
-                                0 => RED_FLOWER,
-                                1 => YELLOW_FLOWER,
-                                2 => BLUE_FLOWER,
+                            let flower_choice = match random_choice {
+                                0..10 => RED_FLOWER,
+                                10..20 => YELLOW_FLOWER,
+                                20..30 => BLUE_FLOWER,
                                 _ => WHITE_FLOWER,
                             };
-                            editor.set_block(flower_choice, x, ground_level + 1, z, None, None);
+                            editor.set_block(flower_choice, x, 1, z, None, None);
                         }
-                        31..=70 => {
+                        30..90 => {
                             // Grass
-                            editor.set_block(GRASS, x, ground_level + 1, z, None, None);
+                            editor.set_block(GRASS, x, 1, z, None, None);
                         }
-                        71..=80 => {
+                        90..105 => {
+                            // Oak leaves
+                            editor.set_block(OAK_LEAVES, x, 1, z, None, None);
+                        }
+                        105..120 => {
                             // Tree
-                            create_tree(
-                                editor,
-                                x,
-                                ground_level + 1,
-                                z,
-                                rng.gen_range(1..=3),
-                                args.winter,
-                            );
+                            Tree::create(editor, (x, 1, z));
                         }
                         _ => {}
                     }
@@ -153,36 +127,38 @@ pub fn generate_leisure(
                     let random_choice: i32 = rng.gen_range(0..5000);
 
                     match random_choice {
-                        0..=10 => {
+                        0..10 => {
                             // Swing set
-                            for y in 1..=4 {
-                                editor.set_block(OAK_FENCE, x - 1, ground_level + y, z, None, None);
-                                editor.set_block(OAK_FENCE, x + 1, ground_level + y, z, None, None);
+                            for y in 1..=3 {
+                                editor.set_block(OAK_FENCE, x - 1, y, z, None, None);
+                                editor.set_block(OAK_FENCE, x + 1, y, z, None, None);
                             }
-                            editor.set_block(OAK_FENCE, x, ground_level + 4, z, None, None);
-                            editor.set_block(STONE_BLOCK_SLAB, x, ground_level + 2, z, None, None);
+                            editor.set_block(OAK_PLANKS, x - 1, 4, z, None, None);
+                            editor.set_block(OAK_SLAB, x, 4, z, None, None);
+                            editor.set_block(OAK_PLANKS, x + 1, 4, z, None, None);
+                            editor.set_block(STONE_BLOCK_SLAB, x, 2, z, None, None);
                         }
-                        11..=20 => {
+                        10..20 => {
                             // Slide
-                            editor.set_block(OAK_SLAB, x, ground_level + 1, z, None, None);
-                            editor.set_block(OAK_SLAB, x + 1, ground_level + 2, z, None, None);
-                            editor.set_block(OAK_SLAB, x + 2, ground_level + 3, z, None, None);
+                            editor.set_block(OAK_SLAB, x, 1, z, None, None);
+                            editor.set_block(OAK_SLAB, x + 1, 2, z, None, None);
+                            editor.set_block(OAK_SLAB, x + 2, 3, z, None, None);
 
-                            editor.set_block(OAK_PLANKS, x + 2, ground_level + 2, z, None, None);
-                            editor.set_block(OAK_PLANKS, x + 2, ground_level + 1, z, None, None);
+                            editor.set_block(OAK_PLANKS, x + 2, 2, z, None, None);
+                            editor.set_block(OAK_PLANKS, x + 2, 1, z, None, None);
 
-                            editor.set_block(LADDER, x + 2, ground_level + 2, z - 1, None, None);
-                            editor.set_block(LADDER, x + 2, ground_level + 1, z - 1, None, None);
+                            editor.set_block(LADDER, x + 2, 2, z - 1, None, None);
+                            editor.set_block(LADDER, x + 2, 1, z - 1, None, None);
                         }
-                        21..=30 => {
+                        20..30 => {
                             // Sandpit
                             editor.fill_blocks(
                                 SAND,
                                 x - 3,
-                                ground_level,
+                                0,
                                 z - 3,
                                 x + 3,
-                                ground_level,
+                                0,
                                 z + 3,
                                 Some(&[GREEN_STAINED_HARDENED_CLAY]),
                                 None,
@@ -199,14 +175,13 @@ pub fn generate_leisure(
 pub fn generate_leisure_from_relation(
     editor: &mut WorldEditor,
     rel: &ProcessedRelation,
-    ground: &Ground,
     args: &Args,
 ) {
     if rel.tags.get("leisure") == Some(&"park".to_string()) {
         // First generate individual ways with their original tags
         for member in &rel.members {
             if member.role == ProcessedMemberRole::Outer {
-                generate_leisure(editor, &member.way, ground, args);
+                generate_leisure(editor, &member.way, args);
             }
         }
 
@@ -226,6 +201,6 @@ pub fn generate_leisure_from_relation(
         };
 
         // Generate leisure area from combined way
-        generate_leisure(editor, &combined_way, ground, args);
+        generate_leisure(editor, &combined_way, args);
     }
 }

src/element_processing/man_made.rs

@@ -0,0 +1,256 @@
+use crate::args::Args;
+use crate::block_definitions::*;
+use crate::bresenham::bresenham_line;
+use crate::osm_parser::{ProcessedElement, ProcessedNode};
+use crate::world_editor::WorldEditor;
+
+pub fn generate_man_made(editor: &mut WorldEditor, element: &ProcessedElement, _args: &Args) {
+    // Skip if 'layer' or 'level' is negative in the tags
+    if let Some(layer) = element.tags().get("layer") {
+        if layer.parse::<i32>().unwrap_or(0) < 0 {
+            return;
+        }
+    }
+
+    if let Some(level) = element.tags().get("level") {
+        if level.parse::<i32>().unwrap_or(0) < 0 {
+            return;
+        }
+    }
+
+    if let Some(man_made_type) = element.tags().get("man_made") {
+        match man_made_type.as_str() {
+            "pier" => generate_pier(editor, element),
+            "antenna" => generate_antenna(editor, element),
+            "chimney" => generate_chimney(editor, element),
+            "water_well" => generate_water_well(editor, element),
+            "water_tower" => generate_water_tower(editor, element),
+            "mast" => generate_antenna(editor, element),
+            _ => {} // Unknown man_made type, ignore
+        }
+    }
+}
+
+/// Generate a pier structure with OAK_SLAB planks and OAK_LOG support pillars
+fn generate_pier(editor: &mut WorldEditor, element: &ProcessedElement) {
+    if let ProcessedElement::Way(way) = element {
+        let nodes = &way.nodes;
+        if nodes.len() < 2 {
+            return;
+        }
+
+        // Extract pier dimensions from tags
+        let pier_width = element
+            .tags()
+            .get("width")
+            .and_then(|w| w.parse::<i32>().ok())
+            .unwrap_or(3); // Default 3 blocks wide
+
+        let pier_height = 1; // Pier deck height above ground
+        let support_spacing = 4; // Support pillars every 4 blocks
+
+        // Generate the pier walkway using bresenham line algorithm
+        for i in 0..nodes.len() - 1 {
+            let start_node = &nodes[i];
+            let end_node = &nodes[i + 1];
+
+            let line_points =
+                bresenham_line(start_node.x, 0, start_node.z, end_node.x, 0, end_node.z);
+
+            for (index, (center_x, _y, center_z)) in line_points.iter().enumerate() {
+                // Create pier deck (3 blocks wide)
+                let half_width = pier_width / 2;
+                for x in (center_x - half_width)..=(center_x + half_width) {
+                    for z in (center_z - half_width)..=(center_z + half_width) {
+                        editor.set_block(OAK_SLAB, x, pier_height, z, None, None);
+                    }
+                }
+
+                // Add support pillars every few blocks
+                if index % support_spacing == 0 {
+                    let half_width = pier_width / 2;
+
+                    // Place support pillars at the edges of the pier
+                    let support_positions = [
+                        (center_x - half_width, center_z), // Left side
+                        (center_x + half_width, center_z), // Right side
+                    ];
+
+                    for (pillar_x, pillar_z) in support_positions {
+                        // Support pillars going down from pier level
+                        editor.set_block(OAK_LOG, pillar_x, 0, *pillar_z, None, None);
+                    }
+                }
+            }
+        }
+    }
+}
+
+/// Generate an antenna/radio tower
+fn generate_antenna(editor: &mut WorldEditor, element: &ProcessedElement) {
+    if let Some(first_node) = element.nodes().next() {
+        let x = first_node.x;
+        let z = first_node.z;
+
+        // Extract antenna configuration from tags
+        let height = match element.tags().get("height") {
+            Some(h) => h.parse::<i32>().unwrap_or(20).min(40), // Max 40 blocks
+            None => match element.tags().get("tower:type").map(|s| s.as_str()) {
+                Some("communication") => 20,
+                Some("cellular") => 15,
+                _ => 20,
+            },
+        };
+
+        // Build the main tower pole
+        editor.set_block(IRON_BLOCK, x, 3, z, None, None);
+        for y in 4..height {
+            editor.set_block(IRON_BARS, x, y, z, None, None);
+        }
+
+        // Add structural supports every 7 blocks
+        for y in (7..height).step_by(7) {
+            editor.set_block(IRON_BLOCK, x, y, z, Some(&[IRON_BARS]), None);
+            let support_positions = [(1, 0), (-1, 0), (0, 1), (0, -1)];
+            for (dx, dz) in support_positions {
+                editor.set_block(IRON_BLOCK, x + dx, y, z + dz, None, None);
+            }
+        }
+
+        // Equipment housing at base
+        editor.fill_blocks(
+            GRAY_CONCRETE,
+            x - 1,
+            1,
+            z - 1,
+            x + 1,
+            2,
+            z + 1,
+            Some(&[GRAY_CONCRETE]),
+            None,
+        );
+    }
+}
+
+/// Generate a chimney structure
+fn generate_chimney(editor: &mut WorldEditor, element: &ProcessedElement) {
+    if let Some(first_node) = element.nodes().next() {
+        let x = first_node.x;
+        let z = first_node.z;
+        let height = 25;
+
+        // Build 3x3 brick chimney with hole in the middle
+        for y in 0..height {
+            for dx in -1..=1 {
+                for dz in -1..=1 {
+                    // Skip center block to create hole
+                    if dx == 0 && dz == 0 {
+                        continue;
+                    }
+                    editor.set_block(BRICK, x + dx, y, z + dz, None, None);
+                }
+            }
+        }
+    }
+}
+
+/// Generate a water well structure
+fn generate_water_well(editor: &mut WorldEditor, element: &ProcessedElement) {
+    if let Some(first_node) = element.nodes().next() {
+        let x = first_node.x;
+        let z = first_node.z;
+
+        // Build stone well structure (3x3 base with water in center)
+        for dx in -1..=1 {
+            for dz in -1..=1 {
+                if dx == 0 && dz == 0 {
+                    // Water in the center
+                    editor.set_block(WATER, x, -1, z, None, None);
+                    editor.set_block(WATER, x, 0, z, None, None);
+                } else {
+                    // Stone well walls
+                    editor.set_block(STONE_BRICKS, x + dx, 0, z + dz, None, None);
+                    editor.set_block(STONE_BRICKS, x + dx, 1, z + dz, None, None);
+                }
+            }
+        }
+
+        // Add wooden well frame structure
+        editor.fill_blocks(OAK_LOG, x - 2, 1, z, x - 2, 4, z, None, None);
+        editor.fill_blocks(OAK_LOG, x + 2, 1, z, x + 2, 4, z, None, None);
+
+        // Crossbeam with pulley system
+        editor.set_block(OAK_SLAB, x - 1, 5, z, None, None);
+        editor.set_block(OAK_FENCE, x, 4, z, None, None);
+        editor.set_block(OAK_SLAB, x, 5, z, None, None);
+        editor.set_block(OAK_SLAB, x + 1, 5, z, None, None);
+
+        // Bucket hanging from center
+        editor.set_block(IRON_BLOCK, x, 3, z, None, None);
+    }
+}
+
+/// Generate a water tower structure
+fn generate_water_tower(editor: &mut WorldEditor, element: &ProcessedElement) {
+    if let Some(first_node) = element.nodes().next() {
+        let x = first_node.x;
+        let z = first_node.z;
+        let tower_height = 20;
+        let tank_height = 6;
+
+        // Build support legs (4 corner pillars)
+        let leg_positions = [(-2, -2), (2, -2), (-2, 2), (2, 2)];
+        for (dx, dz) in leg_positions {
+            for y in 0..tower_height {
+                editor.set_block(IRON_BLOCK, x + dx, y, z + dz, None, None);
+            }
+        }
+
+        // Add cross-bracing every 5 blocks for stability
+        for y in (5..tower_height).step_by(5) {
+            // Horizontal bracing
+            for dx in -1..=1 {
+                editor.set_block(SMOOTH_STONE, x + dx, y, z - 2, None, None);
+                editor.set_block(SMOOTH_STONE, x + dx, y, z + 2, None, None);
+            }
+            for dz in -1..=1 {
+                editor.set_block(SMOOTH_STONE, x - 2, y, z + dz, None, None);
+                editor.set_block(SMOOTH_STONE, x + 2, y, z + dz, None, None);
+            }
+        }
+
+        // Build water tank at the top - simple rectangular tank
+        editor.fill_blocks(
+            POLISHED_ANDESITE,
+            x - 3,
+            tower_height,
+            z - 3,
+            x + 3,
+            tower_height + tank_height,
+            z + 3,
+            None,
+            None,
+        );
+
+        // Add polished andesite pipe going down from the tank
+        for y in 0..tower_height {
+            editor.set_block(POLISHED_ANDESITE, x, y, z, None, None);
+        }
+    }
+}
+
+/// Generate man_made structures for node elements
+pub fn generate_man_made_nodes(editor: &mut WorldEditor, node: &ProcessedNode) {
+    if let Some(man_made_type) = node.tags.get("man_made") {
+        let element = ProcessedElement::Node(node.clone());
+
+        match man_made_type.as_str() {
+            "antenna" => generate_antenna(editor, &element),
+            "chimney" => generate_chimney(editor, &element),
+            "water_well" => generate_water_well(editor, &element),
+            "water_tower" => generate_water_tower(editor, &element),
+            "mast" => generate_antenna(editor, &element),
+            _ => {} // Unknown man_made type, ignore
+        }
+    }
+}

src/element_processing/mod.rs

@@ -6,8 +6,10 @@ pub mod doors;
 pub mod highways;
 pub mod landuse;
 pub mod leisure;
+pub mod man_made;
 pub mod natural;
 pub mod railways;
+pub mod subprocessor;
 pub mod tourisms;
 pub mod tree;
 pub mod water_areas;

src/element_processing/natural.rs

@@ -1,66 +1,48 @@
 use crate::args::Args;
 use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
-use crate::cartesian::XZPoint;
-use crate::element_processing::tree::create_tree;
+use crate::element_processing::tree::Tree;
 use crate::floodfill::flood_fill_area;
-use crate::ground::Ground;
-use crate::osm_parser::ProcessedElement;
+use crate::osm_parser::{ProcessedElement, ProcessedMemberRole, ProcessedRelation, ProcessedWay};
 use crate::world_editor::WorldEditor;
 use rand::Rng;
 
-pub fn generate_natural(
-    editor: &mut WorldEditor,
-    element: &ProcessedElement,
-    ground: &Ground,
-    args: &Args,
-) {
+pub fn generate_natural(editor: &mut WorldEditor, element: &ProcessedElement, args: &Args) {
     if let Some(natural_type) = element.tags().get("natural") {
         if natural_type == "tree" {
             if let ProcessedElement::Node(node) = element {
                 let x: i32 = node.x;
                 let z: i32 = node.z;
 
-                let mut rng: rand::prelude::ThreadRng = rand::thread_rng();
-                create_tree(
-                    editor,
-                    x,
-                    ground.level(node.xz()) + 1,
-                    z,
-                    rng.gen_range(1..=3),
-                    args.winter,
-                );
+                Tree::create(editor, (x, 1, z));
             }
         } else {
             let mut previous_node: Option<(i32, i32)> = None;
             let mut corner_addup: (i32, i32, i32) = (0, 0, 0);
             let mut current_natural: Vec<(i32, i32)> = vec![];
+            let binding: String = "".to_string();
 
             // Determine block type based on natural tag
             let block_type: Block = match natural_type.as_str() {
-                "scrub" | "grassland" | "wood" => {
-                    if args.winter {
-                        SNOW_BLOCK
-                    } else {
-                        GRASS_BLOCK
-                    }
-                }
-                "beach" | "sand" => SAND,
-                "tree_row" => {
-                    if args.winter {
-                        SNOW_BLOCK
-                    } else {
-                        GRASS_BLOCK
-                    }
-                }
-                "wetland" | "water" => WATER,
-                _ => {
-                    if args.winter {
-                        SNOW_BLOCK
-                    } else {
-                        GRASS_BLOCK
+                "scrub" | "grassland" | "wood" | "heath" | "tree_row" => GRASS_BLOCK,
+                "sand" | "dune" => SAND,
+                "beach" | "shoal" => {
+                    let surface = element.tags().get("natural").unwrap_or(&binding);
+                    match surface.as_str() {
+                        "gravel" => GRAVEL,
+                        _ => SAND,
                     }
                 }
+                "water" | "reef" => WATER,
+                "bare_rock" => STONE,
+                "blockfield" => COBBLESTONE,
+                "glacier" => PACKED_ICE,
+                "mud" | "wetland" => MUD,
+                "mountain_range" => COBBLESTONE,
+                "saddle" | "ridge" => STONE,
+                "shrubbery" | "tundra" | "hill" => GRASS_BLOCK,
+                "cliff" => STONE,
+                _ => GRASS_BLOCK,
             };
 
             let ProcessedElement::Way(way) = element else {
@@ -77,14 +59,7 @@ pub fn generate_natural(
                     let bresenham_points: Vec<(i32, i32, i32)> =
                         bresenham_line(prev.0, 0, prev.1, x, 0, z);
                     for (bx, _, bz) in bresenham_points {
-                        editor.set_block(
-                            block_type,
-                            bx,
-                            ground.level(XZPoint::new(bx, bz)),
-                            bz,
-                            None,
-                            None,
-                        );
+                        editor.set_block(block_type, bx, 0, bz, None, None);
                     }
 
                     current_natural.push((x, z));
@@ -107,33 +82,400 @@ pub fn generate_natural(
                 let mut rng: rand::prelude::ThreadRng = rand::thread_rng();
 
                 for (x, z) in filled_area {
-                    let y = ground.level(XZPoint::new(x, z));
-
-                    editor.set_block(block_type, x, y, z, None, None);
-
-                    // Generate elements for "wood" and "tree_row"
-                    if natural_type == "wood" || natural_type == "tree_row" {
-                        if editor.check_for_block(x, y, z, None, Some(&[WATER])) {
-                            continue;
+                    editor.set_block(block_type, x, 0, z, None, None);
+                    // Generate custom layer instead of dirt, must be stone on the lowest level
+                    match natural_type.as_str() {
+                        "beach" | "sand" | "dune" | "shoal" => {
+                            editor.set_block(SAND, x, 0, z, None, None);
                         }
-
-                        let random_choice: i32 = rng.gen_range(0..26);
-                        if random_choice == 25 {
-                            create_tree(editor, x, y + 1, z, rng.gen_range(1..=3), args.winter);
-                        } else if random_choice == 2 {
-                            let flower_block = match rng.gen_range(1..=4) {
-                                1 => RED_FLOWER,
-                                2 => BLUE_FLOWER,
-                                3 => YELLOW_FLOWER,
-                                _ => WHITE_FLOWER,
-                            };
-                            editor.set_block(flower_block, x, y + 1, z, None, None);
-                        } else if random_choice <= 1 {
-                            editor.set_block(GRASS, x, y + 1, z, None, None);
+                        "glacier" => {
+                            editor.set_block(PACKED_ICE, x, 0, z, None, None);
+                            editor.set_block(STONE, x, -1, z, None, None);
                         }
+                        "bare_rock" => {
+                            editor.set_block(STONE, x, 0, z, None, None);
+                        }
+                        _ => {}
+                    }
+
+                    // Generate surface elements
+                    if editor.check_for_block(x, 0, z, Some(&[WATER])) {
+                        continue;
+                    }
+                    match natural_type.as_str() {
+                        "grassland" => {
+                            if !editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                                continue;
+                            }
+                            if rng.gen_bool(0.6) {
+                                editor.set_block(GRASS, x, 1, z, None, None);
+                            }
+                        }
+                        "heath" => {
+                            if !editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                                continue;
+                            }
+                            let random_choice = rng.gen_range(0..500);
+                            if random_choice < 33 {
+                                if random_choice <= 2 {
+                                    editor.set_block(COBBLESTONE, x, 0, z, None, None);
+                                } else if random_choice < 6 {
+                                    editor.set_block(OAK_LEAVES, x, 1, z, None, None);
+                                } else {
+                                    editor.set_block(GRASS, x, 1, z, None, None);
+                                }
+                            }
+                        }
+                        "scrub" => {
+                            if !editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                                continue;
+                            }
+                            let random_choice = rng.gen_range(0..500);
+                            if random_choice == 0 {
+                                Tree::create(editor, (x, 1, z));
+                            } else if random_choice == 1 {
+                                let flower_block = match rng.gen_range(1..=4) {
+                                    1 => RED_FLOWER,
+                                    2 => BLUE_FLOWER,
+                                    3 => YELLOW_FLOWER,
+                                    _ => WHITE_FLOWER,
+                                };
+                                editor.set_block(flower_block, x, 1, z, None, None);
+                            } else if random_choice < 40 {
+                                editor.set_block(OAK_LEAVES, x, 1, z, None, None);
+                                if random_choice < 15 {
+                                    editor.set_block(OAK_LEAVES, x, 2, z, None, None);
+                                }
+                            } else if random_choice < 300 {
+                                if random_choice < 250 {
+                                    editor.set_block(GRASS, x, 1, z, None, None);
+                                } else {
+                                    editor.set_block(TALL_GRASS_BOTTOM, x, 1, z, None, None);
+                                    editor.set_block(TALL_GRASS_TOP, x, 2, z, None, None);
+                                }
+                            }
+                        }
+                        "tree_row" | "wood" => {
+                            if !editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                                continue;
+                            }
+                            let random_choice: i32 = rng.gen_range(0..30);
+                            if random_choice == 0 {
+                                Tree::create(editor, (x, 1, z));
+                            } else if random_choice == 1 {
+                                let flower_block = match rng.gen_range(1..=4) {
+                                    1 => RED_FLOWER,
+                                    2 => BLUE_FLOWER,
+                                    3 => YELLOW_FLOWER,
+                                    _ => WHITE_FLOWER,
+                                };
+                                editor.set_block(flower_block, x, 1, z, None, None);
+                            } else if random_choice <= 12 {
+                                editor.set_block(GRASS, x, 1, z, None, None);
+                            }
+                        }
+                        "sand" => {
+                            if editor.check_for_block(x, 0, z, Some(&[SAND]))
+                                && rng.gen_range(0..100) == 1
+                            {
+                                editor.set_block(DEAD_BUSH, x, 1, z, None, None);
+                            }
+                        }
+                        "shoal" => {
+                            if rng.gen_bool(0.05) {
+                                editor.set_block(WATER, x, 0, z, Some(&[SAND, GRAVEL]), None);
+                            }
+                        }
+                        "wetland" => {
+                            if let Some(wetland_type) = element.tags().get("wetland") {
+                                // Wetland without water blocks
+                                if matches!(wetland_type.as_str(), "wet_meadow" | "fen") {
+                                    if rng.gen_bool(0.3) {
+                                        editor.set_block(GRASS_BLOCK, x, 0, z, Some(&[MUD]), None);
+                                    }
+                                    editor.set_block(GRASS, x, 1, z, None, None);
+                                    continue;
+                                }
+                                // All the other types of wetland
+                                if rng.gen_bool(0.3) {
+                                    editor.set_block(
+                                        WATER,
+                                        x,
+                                        0,
+                                        z,
+                                        Some(&[MUD, GRASS_BLOCK]),
+                                        None,
+                                    );
+                                    continue;
+                                }
+                                if !editor.check_for_block(x, 0, z, Some(&[MUD, MOSS_BLOCK])) {
+                                    continue;
+                                }
+                                match wetland_type.as_str() {
+                                    "reedbed" => {
+                                        editor.set_block(TALL_GRASS_BOTTOM, x, 1, z, None, None);
+                                        editor.set_block(TALL_GRASS_TOP, x, 2, z, None, None);
+                                    }
+                                    "swamp" | "mangrove" => {
+                                        // TODO implement mangrove
+                                        let random_choice: i32 = rng.gen_range(0..40);
+                                        if random_choice == 0 {
+                                            Tree::create(editor, (x, 1, z));
+                                        } else if random_choice < 35 {
+                                            editor.set_block(GRASS, x, 1, z, None, None);
+                                        }
+                                    }
+                                    "bog" => {
+                                        if rng.gen_bool(0.2) {
+                                            editor.set_block(
+                                                MOSS_BLOCK,
+                                                x,
+                                                0,
+                                                z,
+                                                Some(&[MUD]),
+                                                None,
+                                            );
+                                        }
+                                        if rng.gen_bool(0.15) {
+                                            editor.set_block(GRASS, x, 1, z, None, None);
+                                        }
+                                    }
+                                    "tidalflat" => {
+                                        continue; // No vegetation here
+                                    }
+                                    _ => {
+                                        editor.set_block(GRASS, x, 1, z, None, None);
+                                    }
+                                }
+                            } else {
+                                // Generic natural=wetland without wetland=... tag
+                                if rng.gen_bool(0.3) {
+                                    editor.set_block(WATER, x, 0, z, Some(&[MUD]), None);
+                                    continue;
+                                }
+                                editor.set_block(GRASS, x, 1, z, None, None);
+                            }
+                        }
+                        "mountain_range" => {
+                            // Create block clusters instead of random placement
+                            let cluster_chance = rng.gen_range(0..1000);
+
+                            if cluster_chance < 50 {
+                                // 5% chance to start a new cluster
+                                let cluster_block = match rng.gen_range(0..7) {
+                                    0 => DIRT,
+                                    1 => STONE,
+                                    2 => GRAVEL,
+                                    3 => GRANITE,
+                                    4 => DIORITE,
+                                    5 => ANDESITE,
+                                    _ => GRASS_BLOCK,
+                                };
+
+                                // Generate cluster size (5-10 blocks radius)
+                                let cluster_size = rng.gen_range(5..=10);
+
+                                // Create cluster around current position
+                                for dx in -(cluster_size as i32)..=(cluster_size as i32) {
+                                    for dz in -(cluster_size as i32)..=(cluster_size as i32) {
+                                        let cluster_x = x + dx;
+                                        let cluster_z = z + dz;
+
+                                        // Use distance to create more natural cluster shape
+                                        let distance = ((dx * dx + dz * dz) as f32).sqrt();
+                                        if distance <= cluster_size as f32 {
+                                            // Probability decreases with distance from center
+                                            let place_prob = 1.0 - (distance / cluster_size as f32);
+                                            if rng.gen::<f32>() < place_prob {
+                                                editor.set_block(
+                                                    cluster_block,
+                                                    cluster_x,
+                                                    0,
+                                                    cluster_z,
+                                                    None,
+                                                    None,
+                                                );
+
+                                                // Add vegetation on grass blocks
+                                                if cluster_block == GRASS_BLOCK {
+                                                    let vegetation_chance = rng.gen_range(0..100);
+                                                    if vegetation_chance == 0 {
+                                                        // 1% chance for rare trees
+                                                        Tree::create(
+                                                            editor,
+                                                            (cluster_x, 1, cluster_z),
+                                                        );
+                                                    } else if vegetation_chance < 15 {
+                                                        // 15% chance for grass
+                                                        editor.set_block(
+                                                            GRASS, cluster_x, 1, cluster_z, None,
+                                                            None,
+                                                        );
+                                                    } else if vegetation_chance < 25 {
+                                                        // 10% chance for oak leaves
+                                                        editor.set_block(
+                                                            OAK_LEAVES, cluster_x, 1, cluster_z,
+                                                            None, None,
+                                                        );
+                                                    }
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                        "saddle" => {
+                            // Saddle areas - lowest point between peaks, mix of stone and grass
+                            let terrain_chance = rng.gen_range(0..100);
+                            if terrain_chance < 30 {
+                                // 30% chance for exposed stone
+                                editor.set_block(STONE, x, 0, z, None, None);
+                            } else if terrain_chance < 50 {
+                                // 20% chance for gravel/rocky terrain
+                                editor.set_block(GRAVEL, x, 0, z, None, None);
+                            } else {
+                                // 50% chance for grass
+                                editor.set_block(GRASS_BLOCK, x, 0, z, None, None);
+                                if rng.gen_bool(0.4) {
+                                    // 40% chance for grass on top
+                                    editor.set_block(GRASS, x, 1, z, None, None);
+                                }
+                            }
+                        }
+                        "ridge" => {
+                            // Ridge areas - elevated crest, mostly rocky with some vegetation
+                            let ridge_chance = rng.gen_range(0..100);
+                            if ridge_chance < 60 {
+                                // 60% chance for stone/rocky terrain
+                                let rock_type = match rng.gen_range(0..4) {
+                                    0 => STONE,
+                                    1 => COBBLESTONE,
+                                    2 => GRANITE,
+                                    _ => ANDESITE,
+                                };
+                                editor.set_block(rock_type, x, 0, z, None, None);
+                            } else {
+                                // 40% chance for grass with sparse vegetation
+                                editor.set_block(GRASS_BLOCK, x, 0, z, None, None);
+                                let vegetation_chance = rng.gen_range(0..100);
+                                if vegetation_chance < 20 {
+                                    // 20% chance for grass
+                                    editor.set_block(GRASS, x, 1, z, None, None);
+                                } else if vegetation_chance < 25 {
+                                    // 5% chance for small shrubs
+                                    editor.set_block(OAK_LEAVES, x, 1, z, None, None);
+                                }
+                            }
+                        }
+                        "shrubbery" => {
+                            // Manicured shrubs and decorative vegetation
+                            editor.set_block(OAK_LEAVES, x, 1, z, None, None);
+                            editor.set_block(OAK_LEAVES, x, 2, z, None, None);
+                        }
+                        "tundra" => {
+                            // Treeless habitat with low vegetation, mosses, lichens
+                            if !editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                                continue;
+                            }
+                            let tundra_chance = rng.gen_range(0..100);
+                            if tundra_chance < 40 {
+                                // 40% chance for grass (sedges, grasses)
+                                editor.set_block(GRASS, x, 1, z, None, None);
+                            } else if tundra_chance < 60 {
+                                // 20% chance for moss
+                                editor.set_block(MOSS_BLOCK, x, 0, z, Some(&[GRASS_BLOCK]), None);
+                            } else if tundra_chance < 70 {
+                                // 10% chance for dead bush (lichens)
+                                editor.set_block(DEAD_BUSH, x, 1, z, None, None);
+                            }
+                            // 30% chance for bare ground (no surface block)
+                        }
+                        "cliff" => {
+                            // Cliff areas - predominantly stone with minimal vegetation
+                            let cliff_chance = rng.gen_range(0..100);
+                            if cliff_chance < 90 {
+                                // 90% chance for stone variants
+                                let stone_type = match rng.gen_range(0..4) {
+                                    0 => STONE,
+                                    1 => COBBLESTONE,
+                                    2 => ANDESITE,
+                                    _ => DIORITE,
+                                };
+                                editor.set_block(stone_type, x, 0, z, None, None);
+                            } else {
+                                // 10% chance for gravel/loose rock
+                                editor.set_block(GRAVEL, x, 0, z, None, None);
+                            }
+                        }
+                        "hill" => {
+                            // Hill areas - elevated terrain with sparse trees and mostly grass
+                            if !editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
+                                continue;
+                            }
+                            let hill_chance = rng.gen_range(0..1000);
+                            if hill_chance == 0 {
+                                // 0.1% chance for rare trees
+                                Tree::create(editor, (x, 1, z));
+                            } else if hill_chance < 50 {
+                                // 5% chance for flowers
+                                let flower_block = match rng.gen_range(1..=4) {
+                                    1 => RED_FLOWER,
+                                    2 => BLUE_FLOWER,
+                                    3 => YELLOW_FLOWER,
+                                    _ => WHITE_FLOWER,
+                                };
+                                editor.set_block(flower_block, x, 1, z, None, None);
+                            } else if hill_chance < 600 {
+                                // 55% chance for grass
+                                editor.set_block(GRASS, x, 1, z, None, None);
+                            } else if hill_chance < 650 {
+                                // 5% chance for tall grass
+                                editor.set_block(TALL_GRASS_BOTTOM, x, 1, z, None, None);
+                                editor.set_block(TALL_GRASS_TOP, x, 2, z, None, None);
+                            }
+                            // 35% chance for bare grass block
+                        }
+                        _ => {}
                     }
                 }
             }
         }
     }
 }
+
+pub fn generate_natural_from_relation(
+    editor: &mut WorldEditor,
+    rel: &ProcessedRelation,
+    args: &Args,
+) {
+    if rel.tags.contains_key("natural") {
+        // Generate individual ways with their original tags
+        for member in &rel.members {
+            if member.role == ProcessedMemberRole::Outer {
+                generate_natural(editor, &ProcessedElement::Way(member.way.clone()), args);
+            }
+        }
+
+        // Combine all outer ways into one with relation tags
+        let mut combined_nodes = Vec::new();
+        for member in &rel.members {
+            if member.role == ProcessedMemberRole::Outer {
+                combined_nodes.extend(member.way.nodes.clone());
+            }
+        }
+
+        // Only process if we have nodes
+        if !combined_nodes.is_empty() {
+            // Create combined way with relation tags
+            let combined_way = ProcessedWay {
+                id: rel.id,
+                nodes: combined_nodes,
+                tags: rel.tags.clone(),
+            };
+
+            // Generate natural area from combined way
+            generate_natural(editor, &ProcessedElement::Way(combined_way), args);
+        }
+    }
+}

src/element_processing/railways.rs

@@ -1,11 +1,9 @@
 use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
-use crate::cartesian::XZPoint;
-use crate::ground::Ground;
 use crate::osm_parser::ProcessedWay;
 use crate::world_editor::WorldEditor;
 
-pub fn generate_railways(editor: &mut WorldEditor, element: &ProcessedWay, ground: &Ground) {
+pub fn generate_railways(editor: &mut WorldEditor, element: &ProcessedWay) {
     if let Some(railway_type) = element.tags.get("railway") {
         if [
             "proposed",
@@ -41,9 +39,8 @@ pub fn generate_railways(editor: &mut WorldEditor, element: &ProcessedWay, groun
 
             for j in 0..smoothed_points.len() {
                 let (bx, _, bz) = smoothed_points[j];
-                let ground_level = ground.level(XZPoint::new(bx, bz));
 
-                editor.set_block(IRON_BLOCK, bx, ground_level, bz, None, None);
+                editor.set_block(GRAVEL, bx, 0, bz, None, None);
 
                 let prev = if j > 0 {
                     Some(smoothed_points[j - 1])
@@ -62,10 +59,10 @@ pub fn generate_railways(editor: &mut WorldEditor, element: &ProcessedWay, groun
                     next.map(|(x, _, z)| (x, z)),
                 );
 
-                editor.set_block(rail_block, bx, ground_level + 1, bz, None, None);
+                editor.set_block(rail_block, bx, 1, bz, None, None);
 
                 if bx % 4 == 0 {
-                    editor.set_block(OAK_LOG, bx, ground_level, bz, None, None);
+                    editor.set_block(OAK_LOG, bx, 0, bz, None, None);
                 }
             }
         }
@@ -177,3 +174,71 @@ fn determine_rail_direction(
         (None, None) => RAIL_NORTH_SOUTH,
     }
 }
+
+pub fn generate_roller_coaster(editor: &mut WorldEditor, element: &ProcessedWay) {
+    if let Some(roller_coaster) = element.tags.get("roller_coaster") {
+        if roller_coaster == "track" {
+            // Check if it's indoor (skip if yes)
+            if let Some(indoor) = element.tags.get("indoor") {
+                if indoor == "yes" {
+                    return;
+                }
+            }
+
+            // Check if layer is negative (skip if yes)
+            if let Some(layer) = element.tags.get("layer") {
+                if let Ok(layer_value) = layer.parse::<i32>() {
+                    if layer_value < 0 {
+                        return;
+                    }
+                }
+            }
+
+            let elevation_height = 4; // 4 blocks in the air
+            let pillar_interval = 6; // Support pillars every 6 blocks
+
+            for i in 1..element.nodes.len() {
+                let prev_node = element.nodes[i - 1].xz();
+                let cur_node = element.nodes[i].xz();
+
+                let points = bresenham_line(prev_node.x, 0, prev_node.z, cur_node.x, 0, cur_node.z);
+                let smoothed_points = smooth_diagonal_rails(&points);
+
+                for j in 0..smoothed_points.len() {
+                    let (bx, _, bz) = smoothed_points[j];
+
+                    // Place track foundation at elevation height
+                    editor.set_block(IRON_BLOCK, bx, elevation_height, bz, None, None);
+
+                    let prev = if j > 0 {
+                        Some(smoothed_points[j - 1])
+                    } else {
+                        None
+                    };
+                    let next = if j < smoothed_points.len() - 1 {
+                        Some(smoothed_points[j + 1])
+                    } else {
+                        None
+                    };
+
+                    let rail_block = determine_rail_direction(
+                        (bx, bz),
+                        prev.map(|(x, _, z)| (x, z)),
+                        next.map(|(x, _, z)| (x, z)),
+                    );
+
+                    // Place rail on top of the foundation
+                    editor.set_block(rail_block, bx, elevation_height + 1, bz, None, None);
+
+                    // Place support pillars every pillar_interval blocks
+                    if bx % pillar_interval == 0 && bz % pillar_interval == 0 {
+                        // Create a pillar from ground level up to the track
+                        for y in 1..elevation_height {
+                            editor.set_block(IRON_BLOCK, bx, y, bz, None, None);
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

src/element_processing/subprocessor/buildings_interior.rs

@@ -0,0 +1,303 @@
+use crate::block_definitions::*;
+use crate::world_editor::WorldEditor;
+use std::collections::HashSet;
+
+/// Interior layout for building ground floors (1st layer above floor)
+#[rustfmt::skip]
+const INTERIOR1_LAYER1: [[char; 23]; 23] = [
+    ['1', 'U', ' ', 'W', 'C', ' ', ' ', ' ', 'S', 'S', 'W', 'B', 'T', 'T', 'B', 'W', '7', '8', ' ', ' ', ' ', ' ', 'W',],
+    ['2', ' ', ' ', 'W', 'F', ' ', ' ', ' ', 'U', 'U', 'W', 'B', 'T', 'T', 'B', 'W', '7', '8', ' ', ' ', ' ', 'B', 'W',],
+    [' ', ' ', ' ', 'W', 'F', ' ', ' ', ' ', ' ', ' ', 'W', 'B', 'T', 'T', 'B', 'W', 'W', 'W', 'D', 'W', 'W', 'W', 'W',],
+    ['W', 'W', 'D', 'W', 'L', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'A', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'W', 'W', 'W', 'D', 'W', 'W', 'W', 'W', 'D', 'W', 'W', ' ', ' ', 'D',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'B', 'B', 'B', ' ', ' ', 'J', 'W', ' ', ' ', ' ', 'B', 'W', 'W', 'W',],
+    ['W', 'W', 'W', 'W', 'D', 'W', ' ', ' ', 'W', 'T', 'S', 'S', 'T', ' ', ' ', 'W', 'S', 'S', ' ', 'B', 'W', 'W', 'W',],
+    [' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W', 'T', 'T', 'T', 'T', ' ', ' ', 'W', 'U', 'U', ' ', 'B', 'W', ' ', ' ',],
+    [' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'D', 'T', 'T', 'T', 'T', ' ', 'B', 'W', ' ', ' ', ' ', 'B', 'W', ' ', ' ',],
+    ['L', ' ', 'A', 'L', 'W', 'W', ' ', ' ', 'W', 'J', 'U', 'U', ' ', ' ', 'B', 'W', 'W', 'D', 'W', 'W', 'W', ' ', ' ',],
+    ['W', 'W', 'W', 'W', 'W', 'W', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'D', 'W', 'W', ' ', ' ', 'W', 'C', 'C', 'W', 'W',],
+    ['B', 'B', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', 'W', ' ', ' ', 'W', 'W',],
+    [' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', ' ', 'D',],
+    [' ', '6', ' ', 'W', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'D', 'W', 'W', 'D', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    ['U', '5', ' ', 'W', ' ', ' ', 'W', 'C', 'F', 'F', ' ', ' ', 'W', ' ', ' ', 'W', 'W', 'D', 'W', 'W', ' ', ' ', 'W',],
+    ['W', 'W', 'W', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', 'W', 'L', ' ', 'W', 'A', ' ', 'B', 'W', ' ', ' ', 'W',],
+    ['B', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W', ' ', ' ', 'B', 'W', 'J', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', 'W', 'U', ' ', ' ', 'W', 'B', ' ', 'D',],
+    ['J', ' ', ' ', 'C', 'B', 'B', 'W', 'L', 'F', ' ', 'W', 'F', ' ', 'W', 'L', 'W', '7', '8', ' ', 'W', 'B', ' ', 'W',],
+    ['B', ' ', ' ', 'B', 'W', 'W', 'W', 'W', 'W', ' ', 'W', 'A', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'C', ' ', 'W',],
+    ['B', ' ', ' ', 'B', 'W', ' ', ' ', ' ', 'D', ' ', 'W', 'C', ' ', ' ', 'W', 'W', 'B', 'B', 'B', 'B', 'W', 'D', 'W',],
+    ['W', 'W', 'D', 'W', 'C', ' ', ' ', ' ', 'W', 'W', 'W', 'B', 'T', 'T', 'B', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+];
+
+/// Interior layout for building ground floors (2nd layer above floor)
+#[rustfmt::skip]
+const INTERIOR1_LAYER2: [[char; 23]; 23] = [
+    [' ', 'P', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'B', ' ', ' ', 'B', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'P', 'P', 'W', 'B', ' ', ' ', 'B', 'W', ' ', ' ', ' ', ' ', ' ', 'B', 'W',],
+    [' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'B', ' ', ' ', 'B', 'W', 'W', 'W', 'D', 'W', 'W', 'W', 'W',],
+    ['W', 'W', 'D', 'W', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'W', 'W', 'W', 'D', 'W', 'W', 'W', 'W', 'D', 'W', 'W', ' ', ' ', 'D',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'B', 'B', 'B', ' ', ' ', ' ', 'W', ' ', ' ', ' ', 'B', 'W', 'W', 'W',],
+    ['W', 'W', 'W', 'W', 'D', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', 'B', 'W', 'W', 'W',],
+    [' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'P', 'P', ' ', 'B', 'W', ' ', ' ',],
+    [' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', 'B', 'W', ' ', ' ', ' ', 'B', 'W', ' ', ' ',],
+    [' ', ' ', ' ', ' ', 'W', 'W', ' ', ' ', 'W', ' ', 'P', 'P', ' ', ' ', 'B', 'W', 'W', 'D', 'W', 'W', 'W', ' ', ' ',],
+    ['W', 'W', 'W', 'W', 'W', 'W', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'D', 'W', 'W', ' ', ' ', 'W', 'C', 'C', 'W', 'W',],
+    ['B', 'B', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', 'W', ' ', ' ', 'W', 'W',],
+    [' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', ' ', 'D',],
+    [' ', ' ', ' ', 'W', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'D', 'W', 'W', 'D', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    ['P', ' ', ' ', 'W', ' ', ' ', 'W', 'N', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W', 'W', 'D', 'W', 'W', ' ', ' ', 'W',],
+    ['W', 'W', 'W', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W', ' ', ' ', 'B', 'W', ' ', ' ', 'W',],
+    ['B', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W', ' ', ' ', 'C', 'W', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', 'W', 'P', ' ', ' ', 'W', 'B', ' ', 'D',],
+    [' ', ' ', ' ', ' ', 'B', 'B', 'W', ' ', ' ', ' ', 'W', ' ', ' ', 'W', 'P', 'W', ' ', ' ', ' ', 'W', 'B', ' ', 'W',],
+    ['B', ' ', ' ', 'B', 'W', 'W', 'W', 'W', 'W', ' ', 'W', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', ' ', ' ', 'W',],
+    ['B', ' ', ' ', 'B', 'W', ' ', ' ', ' ', 'D', ' ', 'W', 'N', ' ', ' ', 'W', 'W', 'B', 'B', 'B', 'B', 'W', 'D', 'W',],
+    ['W', 'W', 'D', 'W', ' ', ' ', ' ', ' ', 'W', 'W', 'W', 'B', ' ', ' ', 'B', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+];
+
+/// Interior layout for building level floors (1nd layer above floor)
+#[rustfmt::skip]
+const INTERIOR2_LAYER1: [[char; 23]; 23] = [
+    ['W', 'W', 'W', 'D', 'W', 'W', 'W', 'W', 'W', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'D', 'W', 'W', 'W',],
+    ['U', ' ', ' ', ' ', ' ', ' ', 'C', 'W', 'L', ' ', ' ', 'L', 'W', 'A', 'A', 'W', ' ', ' ', ' ', ' ', ' ', 'L', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', 'W', 'W', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', 'S', 'S', 'S', ' ', 'W',],
+    [' ', ' ', 'W', 'F', ' ', ' ', ' ', 'W', 'C', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'J', ' ', 'U', 'U', 'U', ' ', 'D',],
+    ['U', ' ', 'W', 'F', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W',],
+    ['U', ' ', 'W', 'F', ' ', ' ', ' ', 'D', ' ', ' ', 'T', 'T', 'W', ' ', ' ', ' ', ' ', ' ', 'U', 'W', ' ', 'L', 'W',],
+    [' ', ' ', 'W', 'W', 'W', ' ', ' ', 'W', ' ', ' ', 'T', 'J', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'D', 'W', 'W', 'W', ' ', ' ', 'W', 'L', ' ', 'W',],
+    ['J', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'C', ' ', ' ', ' ', 'B', 'W', ' ', ' ', 'W', ' ', ' ', 'W',],
+    ['W', 'W', 'W', 'W', 'W', 'L', ' ', ' ', ' ', ' ', 'W', 'C', ' ', ' ', ' ', 'B', 'W', ' ', ' ', 'W', 'W', 'D', 'W',],
+    [' ', 'A', 'B', 'B', 'W', 'W', 'W', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'B', 'W', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', ' ', 'B', 'W', 'L', ' ', ' ', ' ', ' ', 'W', 'L', ' ', ' ', 'B', 'W', 'W', 'B', 'B', 'W', ' ', ' ', 'W',],
+    [' ', ' ', ' ', 'B', 'W', ' ', ' ', ' ', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', ' ', ' ', 'D',],
+    [' ', ' ', ' ', ' ', 'D', ' ', ' ', 'U', ' ', ' ', ' ', 'D', ' ', ' ', 'F', 'F', 'W', 'A', 'A', 'W', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', 'W', ' ', ' ', 'U', ' ', ' ', 'W', 'W', ' ', ' ', ' ', ' ', 'C', ' ', ' ', 'W', ' ', ' ', 'W',],
+    ['C', ' ', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', ' ', ' ', ' ', ' ', 'L', ' ', ' ', 'W', 'W', 'D', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    ['L', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'L', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    ['W', 'W', 'W', 'W', 'W', 'W', ' ', ' ', 'U', 'U', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'U', 'U', ' ', 'W', 'B', ' ', 'U', 'U', 'B', ' ', ' ', ' ', ' ', ' ', 'W',],
+    ['S', 'S', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'B', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'B', ' ', 'W',],
+    ['U', 'U', ' ', ' ', ' ', 'L', 'B', 'B', 'B', ' ', ' ', 'W', 'B', 'B', 'B', 'B', 'B', 'B', 'B', ' ', 'B', 'D', 'W',],
+];
+
+/// Interior layout for building level floors (2nd layer above floor)
+#[rustfmt::skip]
+const INTERIOR2_LAYER2: [[char; 23]; 23] = [
+    ['W', 'W', 'W', 'D', 'W', 'W', 'W', 'W', 'W', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'D', 'W', 'W', 'W',],
+    ['P', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'E', ' ', ' ', 'E', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', 'E', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', 'W', 'W', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', 'W', 'F', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'P', 'P', 'P', ' ', 'D',],
+    ['P', ' ', 'W', 'F', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W',],
+    ['P', ' ', 'W', 'F', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', 'P', 'W', ' ', 'P', 'W',],
+    [' ', ' ', 'W', 'W', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'W', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'D', 'W', 'W', 'W', ' ', ' ', 'W', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'P', ' ', ' ', ' ', 'B', 'W', ' ', ' ', 'W', ' ', ' ', 'W',],
+    ['W', 'W', 'W', 'W', 'W', 'E', ' ', ' ', ' ', ' ', 'W', 'P', ' ', ' ', ' ', 'B', 'W', ' ', ' ', 'W', 'W', 'D', 'W',],
+    [' ', ' ', 'B', 'B', 'W', 'W', 'W', 'W', ' ', ' ', 'W', ' ', ' ', ' ', ' ', 'B', 'W', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', ' ', 'B', 'W', 'E', ' ', ' ', ' ', ' ', 'W', 'E', ' ', ' ', 'B', 'W', 'W', 'B', 'B', 'W', ' ', ' ', 'W',],
+    [' ', ' ', ' ', 'B', 'W', ' ', ' ', ' ', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', ' ', ' ', 'D',],
+    [' ', ' ', ' ', ' ', 'D', ' ', ' ', 'P', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', 'W', ' ', ' ', 'P', ' ', ' ', 'W', 'W', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', ' ', ' ', ' ', ' ', 'E', ' ', ' ', 'W', 'W', 'D', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'D', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    ['E', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'E', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W',],
+    ['W', 'W', 'W', 'W', 'W', 'W', ' ', ' ', 'P', 'P', ' ', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', 'W', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'P', 'P', ' ', 'W', 'B', ' ', 'P', 'P', 'B', ' ', ' ', ' ', ' ', ' ', 'W',],
+    [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'W', 'B', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'B', ' ', 'W',],
+    ['P', 'P', ' ', ' ', ' ', 'E', 'B', 'B', 'B', ' ', ' ', 'W', 'B', 'B', 'B', 'B', 'B', 'B', 'B', ' ', 'B', ' ', 'D',],
+];
+
+/// Maps interior layout characters to actual block types for different floor layers
+#[inline(always)]
+pub fn get_interior_block(c: char, is_layer2: bool, wall_block: Block) -> Option<Block> {
+    match c {
+        ' ' => None,                     // Nothing
+        'W' => Some(wall_block),         // Use the building's wall block for interior walls
+        'U' => Some(OAK_FENCE),          // Oak Fence
+        'S' => Some(OAK_STAIRS),         // Oak Stairs
+        'B' => Some(BOOKSHELF),          // Bookshelf
+        'C' => Some(CRAFTING_TABLE),     // Crafting Table
+        'F' => Some(FURNACE),            // Furnace
+        '1' => Some(RED_BED_NORTH_HEAD), // Bed North Head
+        '2' => Some(RED_BED_NORTH_FOOT), // Bed North Foot
+        '3' => Some(RED_BED_EAST_HEAD),  // Bed East Head
+        '4' => Some(RED_BED_EAST_FOOT),  // Bed East Foot
+        '5' => Some(RED_BED_SOUTH_HEAD), // Bed South Head
+        '6' => Some(RED_BED_SOUTH_FOOT), // Bed South Foot
+        '7' => Some(RED_BED_WEST_HEAD),  // Bed West Head
+        '8' => Some(RED_BED_WEST_FOOT),  // Bed West Foot
+        // 'H' => Some(CHEST),           // Chest
+        'L' => Some(CAULDRON),           // Cauldron
+        'A' => Some(ANVIL),              // Anvil
+        'P' => Some(OAK_PRESSURE_PLATE), // Pressure Plate
+        'D' => {
+            // Use different door types for different layers
+            if is_layer2 {
+                Some(DARK_OAK_DOOR_UPPER)
+            } else {
+                Some(DARK_OAK_DOOR_LOWER)
+            }
+        }
+        'J' => Some(NOTE_BLOCK),    // Note block
+        'G' => Some(GLOWSTONE),     // Glowstone
+        'N' => Some(BREWING_STAND), // Brewing Stand
+        'T' => Some(WHITE_CARPET),  // White Carpet
+        'E' => Some(OAK_LEAVES),    // Oak Leaves
+        _ => None,                  // Default case for unknown characters
+    }
+}
+
+/// Generates interior layouts inside buildings at each floor level
+#[allow(clippy::too_many_arguments)]
+pub fn generate_building_interior(
+    editor: &mut WorldEditor,
+    floor_area: &[(i32, i32)],
+    min_x: i32,
+    min_z: i32,
+    max_x: i32,
+    max_z: i32,
+    start_y_offset: i32,
+    building_height: i32,
+    wall_block: Block,
+    floor_levels: &[i32],
+    args: &crate::args::Args,
+    element: &crate::osm_parser::ProcessedWay,
+    abs_terrain_offset: i32,
+) {
+    // Skip interior generation for very small buildings
+    let width = max_x - min_x + 1;
+    let depth = max_z - min_z + 1;
+
+    if width < 8 || depth < 8 {
+        return; // Building too small for interior
+    }
+
+    // For efficiency, create a HashSet of floor area coordinates
+    let floor_area_set: HashSet<(i32, i32)> = floor_area.iter().cloned().collect();
+
+    // Add buffer around edges to avoid placing furniture too close to walls
+    let buffer = 2;
+    let interior_min_x = min_x + buffer;
+    let interior_min_z = min_z + buffer;
+    let interior_max_x = max_x - buffer;
+    let interior_max_z = max_z - buffer;
+
+    // Generate interiors for each floor
+    for (floor_index, &floor_y) in floor_levels.iter().enumerate() {
+        // Store wall and door positions for this floor to extend them to the ceiling
+        let mut wall_positions = Vec::new();
+        let mut door_positions = Vec::new();
+
+        // Determine the floor extension height (ceiling) - either next floor or roof
+        let current_floor_ceiling = if floor_index < floor_levels.len() - 1 {
+            // For intermediate floors, extend walls up to just below the next floor
+            floor_levels[floor_index + 1] - 1
+        } else {
+            // Last floor ceiling depends on roof generation
+            if args.roof
+                && element.tags.contains_key("roof:shape")
+                && element.tags.get("roof:shape").unwrap() != "flat"
+            {
+                // When roof generation is enabled with non-flat roofs, stop at building height (no extra ceiling)
+                start_y_offset + building_height
+            } else {
+                // When roof generation is disabled or flat roof, extend to building top + 1 (includes ceiling)
+                start_y_offset + building_height + 1
+            }
+        };
+
+        // Choose the appropriate interior pattern based on floor number
+        let (layer1, layer2) = if floor_index == 0 {
+            // Ground floor uses INTERIOR1 patterns
+            (&INTERIOR1_LAYER1, &INTERIOR1_LAYER2)
+        } else {
+            // Upper floors use INTERIOR2 patterns
+            (&INTERIOR2_LAYER1, &INTERIOR2_LAYER2)
+        };
+
+        // Get dimensions for the selected pattern
+        let pattern_height = layer1.len() as i32;
+        let pattern_width = layer1[0].len() as i32;
+
+        // Calculate Y offset - place interior 1 block above floor level consistently
+        let y_offset = 1;
+
+        // Create a seamless repeating pattern across the interior of this floor
+        for z in interior_min_z..=interior_max_z {
+            for x in interior_min_x..=interior_max_x {
+                // Skip if outside the building's floor area
+                if !floor_area_set.contains(&(x, z)) {
+                    continue;
+                }
+
+                // Map the world coordinates to pattern coordinates using modulo
+                // This creates a seamless tiling effect across the entire building
+                // Add floor_index offset to create variation between floors
+                let pattern_x = ((x - interior_min_x + floor_index as i32) % pattern_width
+                    + pattern_width)
+                    % pattern_width;
+                let pattern_z = ((z - interior_min_z + floor_index as i32) % pattern_height
+                    + pattern_height)
+                    % pattern_height;
+
+                // Access the pattern arrays safely
+                let cell1 = layer1[pattern_z as usize][pattern_x as usize];
+                let cell2 = layer2[pattern_z as usize][pattern_x as usize];
+
+                // Place first layer blocks
+                if let Some(block) = get_interior_block(cell1, false, wall_block) {
+                    editor.set_block_absolute(
+                        block,
+                        x,
+                        floor_y + y_offset + abs_terrain_offset,
+                        z,
+                        None,
+                        None,
+                    );
+
+                    // If this is a wall in layer 1, add to wall positions to extend later
+                    if cell1 == 'W' {
+                        wall_positions.push((x, z));
+                    }
+                    // If this is a door in layer 1, add to door positions to add wall above later
+                    else if cell1 == 'D' {
+                        door_positions.push((x, z));
+                    }
+                }
+
+                // Place second layer blocks
+                if let Some(block) = get_interior_block(cell2, true, wall_block) {
+                    editor.set_block_absolute(
+                        block,
+                        x,
+                        floor_y + y_offset + abs_terrain_offset + 1,
+                        z,
+                        None,
+                        None,
+                    );
+                }
+            }
+        }
+
+        // Extend walls all the way to the next floor ceiling or roof
+        for (x, z) in &wall_positions {
+            for y in (floor_y + y_offset + 2)..=current_floor_ceiling {
+                editor.set_block_absolute(wall_block, *x, y + abs_terrain_offset, *z, None, None);
+            }
+        }
+
+        // Add wall blocks above doors all the way to the ceiling/next floor
+        for (x, z) in &door_positions {
+            for y in (floor_y + y_offset + 2)..=current_floor_ceiling {
+                editor.set_block_absolute(wall_block, *x, y + abs_terrain_offset, *z, None, None);
+            }
+        }
+    }
+}

src/element_processing/subprocessor/mod.rs

@@ -0,0 +1 @@
+pub mod buildings_interior;

src/element_processing/tourisms.rs

@@ -1,10 +1,8 @@
 use crate::block_definitions::*;
-use crate::cartesian::XZPoint;
-use crate::ground::Ground;
 use crate::osm_parser::ProcessedNode;
 use crate::world_editor::WorldEditor;
 
-pub fn generate_tourisms(editor: &mut WorldEditor, element: &ProcessedNode, ground: &Ground) {
+pub fn generate_tourisms(editor: &mut WorldEditor, element: &ProcessedNode) {
     // Skip if 'layer' or 'level' is negative in the tags
     if let Some(layer) = element.tags.get("layer") {
         if layer.parse::<i32>().unwrap_or(0) < 0 {
@@ -22,15 +20,14 @@ pub fn generate_tourisms(editor: &mut WorldEditor, element: &ProcessedNode, grou
         let x: i32 = element.x;
         let z: i32 = element.z;
 
-        // Calculate the dynamic ground level
-        let ground_level = ground.level(XZPoint::new(x, z));
-
         if tourism_type == "information" {
-            if let Some("board") = element.tags.get("information").map(|x: &String| x.as_str()) {
-                // Draw an information board
-                // TODO draw a sign with text
-                editor.set_block(COBBLESTONE_WALL, x, ground_level + 1, z, None, None);
-                editor.set_block(OAK_PLANKS, x, ground_level + 2, z, None, None);
+            if let Some(info_type) = element.tags.get("information").map(|x: &String| x.as_str()) {
+                if info_type != "office" && info_type != "visitor_centre" {
+                    // Draw an information board
+                    // TODO draw a sign with text if provided
+                    editor.set_block(COBBLESTONE_WALL, x, 1, z, None, None);
+                    editor.set_block(OAK_PLANKS, x, 2, z, None, None);
+                }
             }
         }
     }

src/element_processing/tree.rs

@@ -1,166 +1,342 @@
 use crate::block_definitions::*;
 use crate::world_editor::WorldEditor;
+use rand::Rng;
 
-/// Helper function to set blocks in a circular pattern around a central point.
-fn round1(editor: &mut WorldEditor, material: Block, x: i32, y: i32, z: i32) {
-    editor.set_block(material, x - 2, y, z, None, None);
-    editor.set_block(material, x + 2, y, z, None, None);
-    editor.set_block(material, x, y, z - 2, None, None);
-    editor.set_block(material, x, y, z + 2, None, None);
-    editor.set_block(material, x - 1, y, z - 1, None, None);
-    editor.set_block(material, x + 1, y, z + 1, None, None);
-    editor.set_block(material, x + 1, y, z - 1, None, None);
-    editor.set_block(material, x - 1, y, z + 1, None, None);
-}
+type Coord = (i32, i32, i32);
 
-/// Helper function to set blocks in a wider circular pattern.
-fn round2(editor: &mut WorldEditor, material: Block, x: i32, y: i32, z: i32) {
-    editor.set_block(material, x + 3, y, z, None, None);
-    editor.set_block(material, x + 2, y, z - 1, None, None);
-    editor.set_block(material, x + 2, y, z + 1, None, None);
-    editor.set_block(material, x + 1, y, z - 2, None, None);
-    editor.set_block(material, x + 1, y, z + 2, None, None);
-    editor.set_block(material, x - 3, y, z, None, None);
-    editor.set_block(material, x - 2, y, z - 1, None, None);
-    editor.set_block(material, x - 2, y, z + 1, None, None);
-    editor.set_block(material, x - 1, y, z + 2, None, None);
-    editor.set_block(material, x - 1, y, z - 2, None, None);
-    editor.set_block(material, x, y, z - 3, None, None);
-    editor.set_block(material, x, y, z + 3, None, None);
-}
+// TODO all this data would probably be better suited in a TOML file or something.
 
-/// Helper function to set blocks in a more scattered circular pattern.
-fn round3(editor: &mut WorldEditor, material: Block, x: i32, y: i32, z: i32) {
-    editor.set_block(material, x + 3, y, z - 1, None, None);
-    editor.set_block(material, x + 3, y, z + 1, None, None);
-    editor.set_block(material, x + 2, y, z - 2, None, None);
-    editor.set_block(material, x + 2, y, z + 2, None, None);
-    editor.set_block(material, x + 1, y, z - 3, None, None);
-    editor.set_block(material, x + 1, y, z + 3, None, None);
-    editor.set_block(material, x - 3, y, z - 1, None, None);
-    editor.set_block(material, x - 3, y, z + 1, None, None);
-    editor.set_block(material, x - 2, y, z - 2, None, None);
-    editor.set_block(material, x - 2, y, z + 2, None, None);
-    editor.set_block(material, x - 1, y, z + 3, None, None);
-    editor.set_block(material, x - 1, y, z - 3, None, None);
-}
+/// A circular pattern around a central point.
+#[rustfmt::skip]
+const ROUND1_PATTERN: [Coord; 8] = [
+    (-2, 0, 0),
+    (2, 0, 0),
+    (0, 0, -2),
+    (0, 0, 2),
+    (-1, 0, -1),
+    (1, 0, 1),
+    (1, 0, -1),
+    (-1, 0, 1),
+];
 
-/// Function to create different types of trees.
-pub fn create_tree(editor: &mut WorldEditor, x: i32, y: i32, z: i32, typetree: u8, snow: bool) {
-    let mut blacklist: Vec<Block> = Vec::new();
-    blacklist.extend(building_corner_variations());
-    blacklist.extend(building_wall_variations());
-    blacklist.extend(building_floor_variations());
-    blacklist.push(WATER);
+/// A wider circular pattern.
+const ROUND2_PATTERN: [Coord; 12] = [
+    (3, 0, 0),
+    (2, 0, -1),
+    (2, 0, 1),
+    (1, 0, -2),
+    (1, 0, 2),
+    (-3, 0, 0),
+    (-2, 0, -1),
+    (-2, 0, 1),
+    (-1, 0, 2),
+    (-1, 0, -2),
+    (0, 0, -3),
+    (0, 0, 3),
+];
 
-    if editor.check_for_block(x, y - 1, z, None, Some(&blacklist)) {
-        return;
-    }
+/// A more scattered circular pattern.
+const ROUND3_PATTERN: [Coord; 12] = [
+    (3, 0, -1),
+    (3, 0, 1),
+    (2, 0, -2),
+    (2, 0, 2),
+    (1, 0, -3),
+    (1, 0, 3),
+    (-3, 0, -1),
+    (-3, 0, 1),
+    (-2, 0, -2),
+    (-2, 0, 2),
+    (-1, 0, 3),
+    (-1, 0, -3),
+];
 
-    match typetree {
-        1 => {
-            // Oak tree
-            editor.fill_blocks(OAK_LOG, x, y, z, x, y + 8, z, None, None);
-            editor.fill_blocks(OAK_LEAVES, x - 1, y + 3, z, x - 1, y + 9, z, None, None);
-            editor.fill_blocks(OAK_LEAVES, x + 1, y + 3, z, x + 1, y + 9, z, None, None);
-            editor.fill_blocks(OAK_LEAVES, x, y + 3, z - 1, x, y + 9, z - 1, None, None);
-            editor.fill_blocks(OAK_LEAVES, x, y + 3, z + 1, x, y + 9, z + 1, None, None);
-            editor.fill_blocks(OAK_LEAVES, x, y + 9, z, x, y + 10, z, None, None);
-            round1(editor, OAK_LEAVES, x, y + 8, z);
-            round1(editor, OAK_LEAVES, x, y + 7, z);
-            round1(editor, OAK_LEAVES, x, y + 6, z);
-            round1(editor, OAK_LEAVES, x, y + 5, z);
-            round1(editor, OAK_LEAVES, x, y + 4, z);
-            round1(editor, OAK_LEAVES, x, y + 3, z);
-            round2(editor, OAK_LEAVES, x, y + 7, z);
-            round2(editor, OAK_LEAVES, x, y + 6, z);
-            round2(editor, OAK_LEAVES, x, y + 5, z);
-            round2(editor, OAK_LEAVES, x, y + 4, z);
-            round3(editor, OAK_LEAVES, x, y + 6, z);
-            round3(editor, OAK_LEAVES, x, y + 5, z);
+/// Used for iterating over each of the round patterns
+const ROUND_PATTERNS: [&[Coord]; 3] = [&ROUND1_PATTERN, &ROUND2_PATTERN, &ROUND3_PATTERN];
 
-            if snow {
-                editor.set_block(SNOW_LAYER, x, y + 11, z, None, None);
-                editor.set_block(SNOW_LAYER, x + 1, y + 10, z, None, None);
-                editor.set_block(SNOW_LAYER, x - 1, y + 10, z, None, None);
-                editor.set_block(SNOW_LAYER, x, y + 10, z - 1, None, None);
-                editor.set_block(SNOW_LAYER, x, y + 10, z + 1, None, None);
-                round1(editor, SNOW_LAYER, x, y + 9, z);
-                round1(editor, SNOW_LAYER, x, y + 8, z);
-                round1(editor, SNOW_LAYER, x, y + 7, z);
-                round1(editor, SNOW_LAYER, x, y + 6, z);
-                round2(editor, SNOW_LAYER, x, y + 8, z);
-                round2(editor, SNOW_LAYER, x, y + 7, z);
-                round2(editor, SNOW_LAYER, x, y + 6, z);
-                round2(editor, SNOW_LAYER, x, y + 5, z);
-                round3(editor, SNOW_LAYER, x, y + 7, z);
-                round3(editor, SNOW_LAYER, x, y + 6, z);
-            }
-        }
-        2 => {
-            // Spruce tree
-            editor.fill_blocks(SPRUCE_LOG, x, y, z, x, y + 9, z, None, None);
-            editor.fill_blocks(BIRCH_LEAVES, x - 1, y + 3, z, x - 1, y + 10, z, None, None);
-            editor.fill_blocks(BIRCH_LEAVES, x + 1, y + 3, z, x + 1, y + 10, z, None, None);
-            editor.fill_blocks(BIRCH_LEAVES, x, y + 3, z - 1, x, y + 10, z - 1, None, None);
-            editor.fill_blocks(BIRCH_LEAVES, x, y + 3, z + 1, x, y + 10, z + 1, None, None);
-            editor.set_block(BIRCH_LEAVES, x, y + 10, z, None, None);
-            round1(editor, BIRCH_LEAVES, x, y + 9, z);
-            round1(editor, BIRCH_LEAVES, x, y + 7, z);
-            round1(editor, BIRCH_LEAVES, x, y + 6, z);
-            round1(editor, BIRCH_LEAVES, x, y + 4, z);
-            round1(editor, BIRCH_LEAVES, x, y + 3, z);
-            round2(editor, BIRCH_LEAVES, x, y + 6, z);
-            round2(editor, BIRCH_LEAVES, x, y + 3, z);
+//////////////////////////////////////////////////
 
-            if snow {
-                editor.set_block(SNOW_LAYER, x, y + 11, z, None, None);
-                editor.set_block(SNOW_LAYER, x + 1, y + 11, z, None, None);
-                editor.set_block(SNOW_LAYER, x - 1, y + 11, z, None, None);
-                editor.set_block(SNOW_LAYER, x, y + 11, z - 1, None, None);
-                editor.set_block(SNOW_LAYER, x, y + 11, z + 1, None, None);
-                round1(editor, SNOW_LAYER, x, y + 10, z);
-                round1(editor, SNOW_LAYER, x, y + 8, z);
-                round1(editor, SNOW_LAYER, x, y + 7, z);
-                round1(editor, SNOW_LAYER, x, y + 5, z);
-                round1(editor, SNOW_LAYER, x, y + 4, z);
-                round2(editor, SNOW_LAYER, x, y + 7, z);
-                round2(editor, SNOW_LAYER, x, y + 4, z);
-            }
-        }
-        3 => {
-            // Birch tree
-            editor.fill_blocks(BIRCH_LOG, x, y, z, x, y + 6, z, None, None);
-            editor.fill_blocks(BIRCH_LEAVES, x - 1, y + 2, z, x - 1, y + 7, z, None, None);
-            editor.fill_blocks(BIRCH_LEAVES, x + 1, y + 2, z, x + 1, y + 7, z, None, None);
-            editor.fill_blocks(BIRCH_LEAVES, x, y + 2, z - 1, x, y + 7, z - 1, None, None);
-            editor.fill_blocks(BIRCH_LEAVES, x, y + 2, z + 1, x, y + 7, z + 1, None, None);
-            editor.fill_blocks(BIRCH_LEAVES, x, y + 7, z, x, y + 8, z, None, None);
-            round1(editor, BIRCH_LEAVES, x, y + 6, z);
-            round1(editor, BIRCH_LEAVES, x, y + 5, z);
-            round1(editor, BIRCH_LEAVES, x, y + 4, z);
-            round1(editor, BIRCH_LEAVES, x, y + 3, z);
-            round1(editor, BIRCH_LEAVES, x, y + 2, z);
-            round2(editor, BIRCH_LEAVES, x, y + 2, z);
-            round2(editor, BIRCH_LEAVES, x, y + 3, z);
-            round2(editor, BIRCH_LEAVES, x, y + 4, z);
+const OAK_LEAVES_FILL: [(Coord, Coord); 5] = [
+    ((-1, 3, 0), (-1, 9, 0)),
+    ((1, 3, 0), (1, 9, 0)),
+    ((0, 3, -1), (0, 9, -1)),
+    ((0, 3, 1), (0, 9, 1)),
+    ((0, 9, 0), (0, 10, 0)),
+];
 
-            if snow {
-                editor.set_block(SNOW_LAYER, x, y + 9, z, None, None);
-                editor.set_block(SNOW_LAYER, x + 1, y + 8, z, None, None);
-                editor.set_block(SNOW_LAYER, x - 1, y + 8, z, None, None);
-                editor.set_block(SNOW_LAYER, x, y + 8, z - 1, None, None);
-                editor.set_block(SNOW_LAYER, x, y + 8, z + 1, None, None);
-                round1(editor, SNOW_LAYER, x, y + 7, z);
-                round1(editor, SNOW_LAYER, x, y + 6, z);
-                round1(editor, SNOW_LAYER, x, y + 5, z);
-                round1(editor, SNOW_LAYER, x, y + 4, z);
-                round1(editor, SNOW_LAYER, x, y + 3, z);
-                round2(editor, SNOW_LAYER, x, y + 3, z);
-                round2(editor, SNOW_LAYER, x, y + 4, z);
-                round2(editor, SNOW_LAYER, x, y + 5, z);
-            }
-        }
-        _ => {} // Do nothing if typetree is not recognized
+const SPRUCE_LEAVES_FILL: [(Coord, Coord); 6] = [
+    ((-1, 3, 0), (-1, 10, 0)),
+    ((0, 3, -1), (0, 10, -1)),
+    ((1, 3, 0), (1, 10, 0)),
+    ((0, 3, -1), (0, 10, -1)),
+    ((0, 3, 1), (0, 10, 1)),
+    ((0, 11, 0), (0, 11, 0)),
+];
+
+const BIRCH_LEAVES_FILL: [(Coord, Coord); 5] = [
+    ((-1, 2, 0), (-1, 7, 0)),
+    ((1, 2, 0), (1, 7, 0)),
+    ((0, 2, -1), (0, 7, -1)),
+    ((0, 2, 1), (0, 7, 1)),
+    ((0, 7, 0), (0, 8, 0)),
+];
+
+//////////////////////////////////////////////////
+
+/// Helper function to set blocks in various patterns.
+fn round(editor: &mut WorldEditor, material: Block, (x, y, z): Coord, block_pattern: &[Coord]) {
+    for (i, j, k) in block_pattern {
+        editor.set_block(material, x + i, y + j, z + k, None, None);
     }
 }
+
+pub enum TreeType {
+    Oak,
+    Spruce,
+    Birch,
+}
+
+// TODO what should be moved in, and what should be referenced?
+pub struct Tree<'a> {
+    // kind: TreeType, // NOTE: Not actually necessary to store!
+    log_block: Block,
+    log_height: i32,
+    leaves_block: Block,
+    leaves_fill: &'a [(Coord, Coord)],
+    round_ranges: [Vec<i32>; 3],
+}
+
+impl Tree<'_> {
+    pub fn create(editor: &mut WorldEditor, (x, y, z): Coord) {
+        let mut blacklist: Vec<Block> = Vec::new();
+        blacklist.extend(Self::get_building_wall_blocks());
+        blacklist.extend(Self::get_building_floor_blocks());
+        blacklist.extend(Self::get_structural_blocks());
+        blacklist.extend(Self::get_functional_blocks());
+        blacklist.push(WATER);
+
+        let mut rng = rand::thread_rng();
+
+        let tree = Self::get_tree(match rng.gen_range(1..=3) {
+            1 => TreeType::Oak,
+            2 => TreeType::Spruce,
+            3 => TreeType::Birch,
+            _ => unreachable!(),
+        });
+
+        // Build the logs
+        editor.fill_blocks(
+            tree.log_block,
+            x,
+            y,
+            z,
+            x,
+            y + tree.log_height,
+            z,
+            None,
+            Some(&blacklist),
+        );
+
+        // Fill in the leaves
+        for ((i1, j1, k1), (i2, j2, k2)) in tree.leaves_fill {
+            editor.fill_blocks(
+                tree.leaves_block,
+                x + i1,
+                y + j1,
+                z + k1,
+                x + i2,
+                y + j2,
+                z + k2,
+                None,
+                None,
+            );
+        }
+
+        // Do the three rounds
+        for (round_range, round_pattern) in tree.round_ranges.iter().zip(ROUND_PATTERNS) {
+            for offset in round_range {
+                round(editor, tree.leaves_block, (x, y + offset, z), round_pattern);
+            }
+        }
+    }
+
+    fn get_tree(kind: TreeType) -> Self {
+        match kind {
+            TreeType::Oak => Self {
+                // kind,
+                log_block: OAK_LOG,
+                log_height: 8,
+                leaves_block: OAK_LEAVES,
+                leaves_fill: &OAK_LEAVES_FILL,
+                round_ranges: [
+                    (3..=8).rev().collect(),
+                    (4..=7).rev().collect(),
+                    (5..=6).rev().collect(),
+                ],
+            },
+
+            TreeType::Spruce => Self {
+                // kind,
+                log_block: SPRUCE_LOG,
+                log_height: 9,
+                leaves_block: BIRCH_LEAVES, // TODO Is this correct?
+                leaves_fill: &SPRUCE_LEAVES_FILL,
+                // TODO can I omit the third empty vec? May cause issues with iter zip
+                round_ranges: [vec![9, 7, 6, 4, 3], vec![6, 3], vec![]],
+            },
+
+            TreeType::Birch => Self {
+                // kind,
+                log_block: BIRCH_LOG,
+                log_height: 6,
+                leaves_block: BIRCH_LEAVES,
+                leaves_fill: &BIRCH_LEAVES_FILL,
+                round_ranges: [(2..=6).rev().collect(), (2..=4).collect(), vec![]],
+            },
+        } // match
+    } // fn get_tree
+
+    /// Get all possible building wall blocks
+    fn get_building_wall_blocks() -> Vec<Block> {
+        vec![
+            BLACKSTONE,
+            BLACK_TERRACOTTA,
+            BRICK,
+            BROWN_CONCRETE,
+            BROWN_TERRACOTTA,
+            DEEPSLATE_BRICKS,
+            END_STONE_BRICKS,
+            GRAY_CONCRETE,
+            GRAY_TERRACOTTA,
+            LIGHT_BLUE_TERRACOTTA,
+            LIGHT_GRAY_CONCRETE,
+            MUD_BRICKS,
+            NETHER_BRICK,
+            NETHERITE_BLOCK,
+            POLISHED_ANDESITE,
+            POLISHED_BLACKSTONE,
+            POLISHED_BLACKSTONE_BRICKS,
+            POLISHED_DEEPSLATE,
+            POLISHED_GRANITE,
+            QUARTZ_BLOCK,
+            QUARTZ_BRICKS,
+            SANDSTONE,
+            SMOOTH_SANDSTONE,
+            SMOOTH_STONE,
+            STONE_BRICKS,
+            WHITE_CONCRETE,
+            WHITE_TERRACOTTA,
+            ORANGE_TERRACOTTA,
+            GREEN_STAINED_HARDENED_CLAY,
+            BLUE_TERRACOTTA,
+            YELLOW_TERRACOTTA,
+            BLACK_CONCRETE,
+            WHITE_CONCRETE,
+            GRAY_CONCRETE,
+            LIGHT_GRAY_CONCRETE,
+            BROWN_CONCRETE,
+            RED_CONCRETE,
+            ORANGE_TERRACOTTA,
+            YELLOW_CONCRETE,
+            LIME_CONCRETE,
+            GREEN_STAINED_HARDENED_CLAY,
+            CYAN_CONCRETE,
+            LIGHT_BLUE_CONCRETE,
+            BLUE_CONCRETE,
+            PURPLE_CONCRETE,
+            MAGENTA_CONCRETE,
+            RED_TERRACOTTA,
+        ]
+    }
+
+    /// Get all possible building floor blocks
+    fn get_building_floor_blocks() -> Vec<Block> {
+        vec![
+            GRAY_CONCRETE,
+            LIGHT_GRAY_CONCRETE,
+            WHITE_CONCRETE,
+            SMOOTH_STONE,
+            POLISHED_ANDESITE,
+            STONE_BRICKS,
+        ]
+    }
+
+    /// Get structural blocks (fences, walls, stairs, slabs, rails, etc.)
+    fn get_structural_blocks() -> Vec<Block> {
+        vec![
+            // Fences
+            OAK_FENCE,
+            // Walls
+            COBBLESTONE_WALL,
+            ANDESITE_WALL,
+            STONE_BRICK_WALL,
+            // Stairs
+            OAK_STAIRS,
+            // Slabs
+            OAK_SLAB,
+            STONE_BLOCK_SLAB,
+            STONE_BRICK_SLAB,
+            // Rails
+            RAIL,
+            RAIL_NORTH_SOUTH,
+            RAIL_EAST_WEST,
+            RAIL_ASCENDING_EAST,
+            RAIL_ASCENDING_WEST,
+            RAIL_ASCENDING_NORTH,
+            RAIL_ASCENDING_SOUTH,
+            RAIL_NORTH_EAST,
+            RAIL_NORTH_WEST,
+            RAIL_SOUTH_EAST,
+            RAIL_SOUTH_WEST,
+            // Doors and trapdoors
+            OAK_DOOR,
+            DARK_OAK_DOOR_LOWER,
+            DARK_OAK_DOOR_UPPER,
+            OAK_TRAPDOOR,
+            // Ladders
+            LADDER,
+        ]
+    }
+
+    /// Get functional blocks (furniture, decorative items, etc.)
+    fn get_functional_blocks() -> Vec<Block> {
+        vec![
+            // Furniture and functional blocks
+            CHEST,
+            CRAFTING_TABLE,
+            FURNACE,
+            ANVIL,
+            BREWING_STAND,
+            NOTE_BLOCK,
+            BOOKSHELF,
+            CAULDRON,
+            // Beds
+            RED_BED_NORTH_HEAD,
+            RED_BED_NORTH_FOOT,
+            RED_BED_EAST_HEAD,
+            RED_BED_EAST_FOOT,
+            RED_BED_SOUTH_HEAD,
+            RED_BED_SOUTH_FOOT,
+            RED_BED_WEST_HEAD,
+            RED_BED_WEST_FOOT,
+            // Pressure plates and signs
+            OAK_PRESSURE_PLATE,
+            SIGN,
+            // Glass blocks (windows)
+            GLASS,
+            WHITE_STAINED_GLASS,
+            GRAY_STAINED_GLASS,
+            LIGHT_GRAY_STAINED_GLASS,
+            BROWN_STAINED_GLASS,
+            TINTED_GLASS,
+            // Carpets
+            WHITE_CARPET,
+            RED_CARPET,
+            // Other structural/building blocks
+            IRON_BARS,
+            IRON_BLOCK,
+            SCAFFOLDING,
+            BEDROCK,
+        ]
+    }
+} // impl Tree

src/element_processing/water_areas.rs

@@ -1,22 +1,47 @@
+use geo::orient::{Direction, Orient};
 use geo::{Contains, Intersects, LineString, Point, Polygon, Rect};
 use std::time::Instant;
 
+use crate::clipping::clip_water_ring_to_bbox;
 use crate::{
     block_definitions::WATER,
-    cartesian::XZPoint,
-    ground::Ground,
-    osm_parser::{ProcessedMemberRole, ProcessedNode, ProcessedRelation},
+    coordinate_system::cartesian::{XZBBox, XZPoint},
+    osm_parser::{ProcessedMemberRole, ProcessedNode, ProcessedRelation, ProcessedWay},
     world_editor::WorldEditor,
 };
 
-pub fn generate_water_areas(
+pub fn generate_water_area_from_way(
     editor: &mut WorldEditor,
-    element: &ProcessedRelation,
-    ground: &Ground,
+    element: &ProcessedWay,
+    _xzbbox: &XZBBox,
 ) {
     let start_time = Instant::now();
 
-    if !element.tags.contains_key("water") {
+    let outers = [element.nodes.clone()];
+    if !verify_closed_rings(&outers) {
+        println!("Skipping way {} due to invalid polygon", element.id);
+        return;
+    }
+
+    generate_water_areas(editor, &outers, &[], start_time);
+}
+
+pub fn generate_water_areas_from_relation(
+    editor: &mut WorldEditor,
+    element: &ProcessedRelation,
+    xzbbox: &XZBBox,
+) {
+    let start_time = Instant::now();
+
+    // Check if this is a water relation (either with water tag or natural=water)
+    let is_water = element.tags.contains_key("water")
+        || element
+            .tags
+            .get("natural")
+            .map(|val| val == "water" || val == "bay")
+            .unwrap_or(false);
+
+    if !is_water {
         return;
     }
 
@@ -37,36 +62,135 @@ pub fn generate_water_areas(
         }
     }
 
-    merge_loopy_loops(&mut outers);
-    if !verify_loopy_loops(&outers) {
+    // Preserve OSM-defined outer/inner roles without modification
+    merge_way_segments(&mut outers);
+
+    // Clip assembled rings to bbox (must happen after merging to preserve ring connectivity)
+    outers = outers
+        .into_iter()
+        .filter_map(|ring| clip_water_ring_to_bbox(&ring, xzbbox))
+        .collect();
+    merge_way_segments(&mut inners);
+    inners = inners
+        .into_iter()
+        .filter_map(|ring| clip_water_ring_to_bbox(&ring, xzbbox))
+        .collect();
+
+    if !verify_closed_rings(&outers) {
+        // For clipped multipolygons, some loops may not close perfectly
+        // Instead of force-closing with straight lines (which creates wedges),
+        // filter out unclosed loops and only render the properly closed ones
+
+        // Filter: Keep only loops that are already closed OR can be closed within 1 block
+        outers.retain(|loop_nodes| {
+            if loop_nodes.len() < 3 {
+                return false;
+            }
+            let first = &loop_nodes[0];
+            let last = loop_nodes.last().unwrap();
+            let dx = (first.x - last.x).abs();
+            let dz = (first.z - last.z).abs();
+
+            // Keep if already closed by ID or endpoints are within 1 block
+            first.id == last.id || (dx <= 1 && dz <= 1)
+        });
+
+        // Now close the remaining loops that are within 1 block tolerance
+        for loop_nodes in outers.iter_mut() {
+            let first = loop_nodes[0].clone();
+            let last_idx = loop_nodes.len() - 1;
+            if loop_nodes[0].id != loop_nodes[last_idx].id {
+                // Endpoints are close (within tolerance), close the loop
+                loop_nodes.push(first);
+            }
+        }
+
+        // If no valid outer loops remain, skip the relation
+        if outers.is_empty() {
+            return;
+        }
+
+        // Verify again after filtering and closing
+        if !verify_closed_rings(&outers) {
+            println!("Skipping relation {} due to invalid polygon", element.id);
+            return;
+        }
+    }
+
+    merge_way_segments(&mut inners);
+    if !verify_closed_rings(&inners) {
+        println!("Skipping relation {} due to invalid polygon", element.id);
         return;
     }
 
-    merge_loopy_loops(&mut inners);
-    if !verify_loopy_loops(&inners) {
-        return;
-    }
-
-    let (max_x, max_z) = editor.get_max_coords();
-    let outers: Vec<Vec<XZPoint>> = outers
-        .iter()
-        .map(|x| x.iter().map(|y| y.xz()).collect::<Vec<_>>())
-        .collect();
-    let inners: Vec<Vec<XZPoint>> = inners
-        .iter()
-        .map(|x| x.iter().map(|y| y.xz()).collect::<Vec<_>>())
-        .collect();
-
-    inverse_floodfill(max_x, max_z, outers, inners, editor, ground, start_time);
+    generate_water_areas(editor, &outers, &inners, start_time);
 }
 
-// Merges ways that share nodes into full loops
-fn merge_loopy_loops(loops: &mut Vec<Vec<ProcessedNode>>) {
+fn generate_water_areas(
+    editor: &mut WorldEditor,
+    outers: &[Vec<ProcessedNode>],
+    inners: &[Vec<ProcessedNode>],
+    start_time: Instant,
+) {
+    // Calculate polygon bounding box to limit fill area
+    let mut poly_min_x = i32::MAX;
+    let mut poly_min_z = i32::MAX;
+    let mut poly_max_x = i32::MIN;
+    let mut poly_max_z = i32::MIN;
+
+    for outer in outers {
+        for node in outer {
+            poly_min_x = poly_min_x.min(node.x);
+            poly_min_z = poly_min_z.min(node.z);
+            poly_max_x = poly_max_x.max(node.x);
+            poly_max_z = poly_max_z.max(node.z);
+        }
+    }
+
+    // If no valid bounds, nothing to fill
+    if poly_min_x == i32::MAX || poly_max_x == i32::MIN {
+        return;
+    }
+
+    // Clamp to world bounds just in case
+    let (world_min_x, world_min_z) = editor.get_min_coords();
+    let (world_max_x, world_max_z) = editor.get_max_coords();
+    let min_x = poly_min_x.max(world_min_x);
+    let min_z = poly_min_z.max(world_min_z);
+    let max_x = poly_max_x.min(world_max_x);
+    let max_z = poly_max_z.min(world_max_z);
+
+    let outers_xz: Vec<Vec<XZPoint>> = outers
+        .iter()
+        .map(|x| x.iter().map(|y| y.xz()).collect::<Vec<_>>())
+        .collect();
+    let inners_xz: Vec<Vec<XZPoint>> = inners
+        .iter()
+        .map(|x| x.iter().map(|y| y.xz()).collect::<Vec<_>>())
+        .collect();
+
+    inverse_floodfill(
+        min_x, min_z, max_x, max_z, outers_xz, inners_xz, editor, start_time,
+    );
+}
+
+/// Merges way segments that share endpoints into closed rings.
+fn merge_way_segments(rings: &mut Vec<Vec<ProcessedNode>>) {
     let mut removed: Vec<usize> = vec![];
     let mut merged: Vec<Vec<ProcessedNode>> = vec![];
 
-    for i in 0..loops.len() {
-        for j in 0..loops.len() {
+    // Match nodes by ID or proximity (handles synthetic nodes from bbox clipping)
+    let nodes_match = |a: &ProcessedNode, b: &ProcessedNode| -> bool {
+        if a.id == b.id {
+            return true;
+        }
+        let dx = (a.x - b.x).abs();
+        let dz = (a.z - b.z).abs();
+        dx <= 1 && dz <= 1
+    };
+
+    for i in 0..rings.len() {
+        for j in 0..rings.len() {
             if i == j {
                 continue;
             }
@@ -75,20 +199,29 @@ fn merge_loopy_loops(loops: &mut Vec<Vec<ProcessedNode>>) {
                 continue;
             }
 
-            let x: &Vec<ProcessedNode> = &loops[i];
-            let y: &Vec<ProcessedNode> = &loops[j];
+            let x: &Vec<ProcessedNode> = &rings[i];
+            let y: &Vec<ProcessedNode> = &rings[j];
 
-            // it's looped already
-            if x[0].id == x.last().unwrap().id {
+            // Skip empty rings (can happen after clipping)
+            if x.is_empty() || y.is_empty() {
                 continue;
             }
 
-            // it's looped already
-            if y[0].id == y.last().unwrap().id {
+            let x_first = &x[0];
+            let x_last = x.last().unwrap();
+            let y_first = &y[0];
+            let y_last = y.last().unwrap();
+
+            // Skip already-closed rings
+            if nodes_match(x_first, x_last) {
                 continue;
             }
 
-            if x[0].id == y[0].id {
+            if nodes_match(y_first, y_last) {
+                continue;
+            }
+
+            if nodes_match(x_first, y_first) {
                 removed.push(i);
                 removed.push(j);
 
@@ -96,7 +229,7 @@ fn merge_loopy_loops(loops: &mut Vec<Vec<ProcessedNode>>) {
                 x.reverse();
                 x.extend(y.iter().skip(1).cloned());
                 merged.push(x);
-            } else if x.last().unwrap().id == y.last().unwrap().id {
+            } else if nodes_match(x_last, y_last) {
                 removed.push(i);
                 removed.push(j);
 
@@ -104,7 +237,7 @@ fn merge_loopy_loops(loops: &mut Vec<Vec<ProcessedNode>>) {
                 x.extend(y.iter().rev().skip(1).cloned());
 
                 merged.push(x);
-            } else if x[0].id == y.last().unwrap().id {
+            } else if nodes_match(x_first, y_last) {
                 removed.push(i);
                 removed.push(j);
 
@@ -112,6 +245,14 @@ fn merge_loopy_loops(loops: &mut Vec<Vec<ProcessedNode>>) {
                 y.extend(x.iter().skip(1).cloned());
 
                 merged.push(y);
+            } else if nodes_match(x_last, y_first) {
+                removed.push(i);
+                removed.push(j);
+
+                let mut x: Vec<ProcessedNode> = x.clone();
+                x.extend(y.iter().skip(1).cloned());
+
+                merged.push(x);
             }
         }
     }
@@ -119,24 +260,35 @@ fn merge_loopy_loops(loops: &mut Vec<Vec<ProcessedNode>>) {
     removed.sort();
 
     for r in removed.iter().rev() {
-        loops.remove(*r);
+        rings.remove(*r);
     }
 
     let merged_len: usize = merged.len();
     for m in merged {
-        loops.push(m);
+        rings.push(m);
     }
 
     if merged_len > 0 {
-        merge_loopy_loops(loops);
+        merge_way_segments(rings);
     }
 }
 
-fn verify_loopy_loops(loops: &[Vec<ProcessedNode>]) -> bool {
-    let mut valid: bool = true;
-    for l in loops {
-        if l[0].id != l.last().unwrap().id {
-            eprintln!("WARN: Disconnected loop");
+/// Verifies all rings are properly closed (first node matches last).
+fn verify_closed_rings(rings: &[Vec<ProcessedNode>]) -> bool {
+    let mut valid = true;
+    for ring in rings {
+        let first = &ring[0];
+        let last = ring.last().unwrap();
+
+        // Check if ring is closed (by ID or proximity)
+        let is_closed = first.id == last.id || {
+            let dx = (first.x - last.x).abs();
+            let dz = (first.z - last.z).abs();
+            dx <= 1 && dz <= 1
+        };
+
+        if !is_closed {
+            eprintln!("WARN: Disconnected ring");
             valid = false;
         }
     }
@@ -147,18 +299,18 @@ fn verify_loopy_loops(loops: &[Vec<ProcessedNode>]) -> bool {
 // Water areas are absolutely huge. We can't easily flood fill the entire thing.
 // Instead, we'll iterate over all the blocks in our MC world, and check if each
 // one is in the river or not
+#[allow(clippy::too_many_arguments)]
 fn inverse_floodfill(
+    min_x: i32,
+    min_z: i32,
     max_x: i32,
     max_z: i32,
     outers: Vec<Vec<XZPoint>>,
     inners: Vec<Vec<XZPoint>>,
     editor: &mut WorldEditor,
-    ground: &Ground,
     start_time: Instant,
 ) {
-    let min_x: i32 = 0;
-    let min_z: i32 = 0;
-
+    // Convert to geo Polygons with normalized winding order
     let inners: Vec<_> = inners
         .into_iter()
         .map(|x| {
@@ -170,6 +322,7 @@ fn inverse_floodfill(
                 ),
                 vec![],
             )
+            .orient(Direction::Default)
         })
         .collect();
 
@@ -184,6 +337,7 @@ fn inverse_floodfill(
                 ),
                 vec![],
             )
+            .orient(Direction::Default)
         })
         .collect();
 
@@ -193,7 +347,6 @@ fn inverse_floodfill(
         &outers,
         &inners,
         editor,
-        ground,
         start_time,
     );
 }
@@ -204,7 +357,6 @@ fn inverse_floodfill_recursive(
     outers: &[Polygon],
     inners: &[Polygon],
     editor: &mut WorldEditor,
-    ground: &Ground,
     start_time: Instant,
 ) {
     // Check if we've exceeded 25 seconds
@@ -212,15 +364,16 @@ fn inverse_floodfill_recursive(
         println!("Water area generation exceeded 25 seconds, continuing anyway");
     }
 
-    const ITERATIVE_THRES: i32 = 10_000;
+    const ITERATIVE_THRES: i64 = 10_000;
 
     if min.0 > max.0 || min.1 > max.1 {
         return;
     }
 
-    if (max.0 - min.0) * (max.1 - min.1) < ITERATIVE_THRES {
-        let ground_level = ground.level(XZPoint::new(min.0, min.1));
-        inverse_floodfill_iterative(min, max, ground_level, outers, inners, editor);
+    // Multiply as i64 to avoid overflow; in release builds where unchecked math is
+    // enabled, this could cause the rest of this code to end up in an infinite loop.
+    if ((max.0 - min.0) as i64) * ((max.1 - min.1) as i64) < ITERATIVE_THRES {
+        inverse_floodfill_iterative(min, max, 0, outers, inners, editor);
         return;
     }
 
@@ -242,8 +395,7 @@ fn inverse_floodfill_recursive(
         if outers.iter().any(|outer: &Polygon| outer.contains(&rect))
             && !inners.iter().any(|inner: &Polygon| inner.intersects(&rect))
         {
-            let ground_level = ground.level(XZPoint::new(min_x, min_z));
-            rect_fill(min_x, max_x, min_z, max_z, ground_level, editor);
+            rect_fill(min_x, max_x, min_z, max_z, 0, editor);
             continue;
         }
 
@@ -265,7 +417,6 @@ fn inverse_floodfill_recursive(
                 &outers_intersects,
                 &inners_intersects,
                 editor,
-                ground,
                 start_time,
             );
         }

src/element_processing/waterways.rs

@@ -1,14 +1,11 @@
 use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
-use crate::cartesian::XZPoint;
-use crate::ground::Ground;
 use crate::osm_parser::ProcessedWay;
 use crate::world_editor::WorldEditor;
 
-pub fn generate_waterways(editor: &mut WorldEditor, element: &ProcessedWay, ground: &Ground) {
-    if let Some(_waterway_type) = element.tags.get("waterway") {
-        let mut previous_node: Option<XZPoint> = None;
-        let mut waterway_width: i32 = 4; // Default waterway width
+pub fn generate_waterways(editor: &mut WorldEditor, element: &ProcessedWay) {
+    if let Some(waterway_type) = element.tags.get("waterway") {
+        let (mut waterway_width, waterway_depth) = get_waterway_dimensions(waterway_type);
 
         // Check for custom width in tags
         if let Some(width_str) = element.tags.get("width") {
@@ -20,42 +17,99 @@ pub fn generate_waterways(editor: &mut WorldEditor, element: &ProcessedWay, grou
             });
         }
 
-        // Process nodes to create waterways
-        for node in &element.nodes {
-            let current_node = node.xz();
+        // Skip layers below the ground level
+        if matches!(
+            element.tags.get("layer").map(|s| s.as_str()),
+            Some("-1") | Some("-2") | Some("-3")
+        ) {
+            return;
+        }
 
-            if let Some(prev) = previous_node {
-                // Skip layers below the ground level
-                if !matches!(
-                    element.tags.get("layer").map(|s| s.as_str()),
-                    Some("-1") | Some("-2") | Some("-3")
-                ) {
-                    // Draw a line between the current and previous node
-                    let bresenham_points: Vec<(i32, i32, i32)> =
-                        bresenham_line(prev.x, 0, prev.z, current_node.x, 0, current_node.z);
+        // Process consecutive node pairs to create waterways
+        // Use windows(2) to avoid connecting last node back to first
+        for nodes_pair in element.nodes.windows(2) {
+            let prev_node = nodes_pair[0].xz();
+            let current_node = nodes_pair[1].xz();
 
-                    for (bx, _, bz) in bresenham_points {
-                        let ground_level = ground.level(XZPoint::new(bx, bz));
+            // Draw a line between the current and previous node
+            let bresenham_points: Vec<(i32, i32, i32)> = bresenham_line(
+                prev_node.x,
+                0,
+                prev_node.z,
+                current_node.x,
+                0,
+                current_node.z,
+            );
 
-                        for x in (bx - waterway_width / 2)..=(bx + waterway_width / 2) {
-                            for z in (bz - waterway_width / 2)..=(bz + waterway_width / 2) {
-                                // Set water block at the ground level
-                                editor.set_block(WATER, x, ground_level, z, None, None);
-                                // Clear vegetation above the water
-                                editor.set_block(
-                                    AIR,
-                                    x,
-                                    ground_level + 1,
-                                    z,
-                                    Some(&[GRASS, WHEAT, CARROTS, POTATOES]),
-                                    None,
-                                );
-                            }
-                        }
-                    }
-                }
+            for (bx, _, bz) in bresenham_points {
+                // Create water channel with proper depth and sloped banks
+                create_water_channel(editor, bx, bz, waterway_width, waterway_depth);
+            }
+        }
+    }
+}
+
+/// Determines width and depth based on waterway type
+fn get_waterway_dimensions(waterway_type: &str) -> (i32, i32) {
+    match waterway_type {
+        "river" => (8, 3),    // Large rivers: 8 blocks wide, 3 blocks deep
+        "canal" => (6, 2),    // Canals: 6 blocks wide, 2 blocks deep
+        "stream" => (3, 2),   // Streams: 3 blocks wide, 2 blocks deep
+        "fairway" => (12, 3), // Shipping fairways: 12 blocks wide, 3 blocks deep
+        "flowline" => (2, 1), // Water flow lines: 2 blocks wide, 1 block deep
+        "brook" => (2, 1),    // Small brooks: 2 blocks wide, 1 block deep
+        "ditch" => (2, 1),    // Ditches: 2 blocks wide, 1 block deep
+        "drain" => (1, 1),    // Drainage: 1 block wide, 1 block deep
+        _ => (4, 2),          // Default: 4 blocks wide, 2 blocks deep
+    }
+}
+
+/// Creates a water channel with proper depth and sloped banks
+fn create_water_channel(
+    editor: &mut WorldEditor,
+    center_x: i32,
+    center_z: i32,
+    width: i32,
+    depth: i32,
+) {
+    let half_width = width / 2;
+
+    for x in (center_x - half_width - 1)..=(center_x + half_width + 1) {
+        for z in (center_z - half_width - 1)..=(center_z + half_width + 1) {
+            let dx = (x - center_x).abs();
+            let dz = (z - center_z).abs();
+            let distance_from_center = dx.max(dz);
+
+            if distance_from_center <= half_width {
+                // Main water channel
+                for y in (1 - depth)..=0 {
+                    editor.set_block(WATER, x, y, z, None, None);
+                }
+
+                // Place one layer of dirt below the water channel
+                editor.set_block(DIRT, x, -depth, z, None, None);
+
+                // Clear vegetation above the water
+                editor.set_block(AIR, x, 1, z, Some(&[GRASS, WHEAT, CARROTS, POTATOES]), None);
+            } else if distance_from_center == half_width + 1 && depth > 1 {
+                // Create sloped banks (one block interval slopes)
+                let slope_depth = (depth - 1).max(1);
+                for y in (1 - slope_depth)..=0 {
+                    if y == 0 {
+                        // Surface level - place water or air
+                        editor.set_block(WATER, x, y, z, None, None);
+                    } else {
+                        // Below surface - dig out for slope
+                        editor.set_block(AIR, x, y, z, None, None);
+                    }
+                }
+
+                // Place one layer of dirt below the sloped areas
+                editor.set_block(DIRT, x, -slope_depth, z, None, None);
+
+                // Clear vegetation above sloped areas
+                editor.set_block(AIR, x, 1, z, Some(&[GRASS, WHEAT, CARROTS, POTATOES]), None);
             }
-            previous_node = Some(current_node);
         }
     }
 }

src/elevation_data.rs

@@ -0,0 +1,607 @@
+use crate::coordinate_system::{geographic::LLBBox, transformation::geo_distance};
+#[cfg(feature = "gui")]
+use crate::telemetry::{send_log, LogLevel};
+use image::Rgb;
+use std::path::Path;
+
+/// Maximum Y coordinate in Minecraft (build height limit)
+const MAX_Y: i32 = 319;
+/// Scale factor for converting real elevation to Minecraft heights
+const BASE_HEIGHT_SCALE: f64 = 0.7;
+/// AWS S3 Terrarium tiles endpoint (no API key required)
+const AWS_TERRARIUM_URL: &str =
+    "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/{z}/{x}/{y}.png";
+/// Terrarium format offset for height decoding
+const TERRARIUM_OFFSET: f64 = 32768.0;
+/// Minimum zoom level for terrain tiles
+const MIN_ZOOM: u8 = 10;
+/// Maximum zoom level for terrain tiles
+const MAX_ZOOM: u8 = 15;
+
+/// Holds processed elevation data and metadata
+#[derive(Clone)]
+pub struct ElevationData {
+    /// Height values in Minecraft Y coordinates
+    pub(crate) heights: Vec<Vec<i32>>,
+    /// Width of the elevation grid
+    pub(crate) width: usize,
+    /// Height of the elevation grid
+    pub(crate) height: usize,
+}
+
+/// Calculates appropriate zoom level for the given bounding box
+fn calculate_zoom_level(bbox: &LLBBox) -> u8 {
+    let lat_diff: f64 = (bbox.max().lat() - bbox.min().lat()).abs();
+    let lng_diff: f64 = (bbox.max().lng() - bbox.min().lng()).abs();
+    let max_diff: f64 = lat_diff.max(lng_diff);
+    let zoom: u8 = (-max_diff.log2() + 20.0) as u8;
+    zoom.clamp(MIN_ZOOM, MAX_ZOOM)
+}
+
+fn lat_lng_to_tile(lat: f64, lng: f64, zoom: u8) -> (u32, u32) {
+    let lat_rad: f64 = lat.to_radians();
+    let n: f64 = 2.0_f64.powi(zoom as i32);
+    let x: u32 = ((lng + 180.0) / 360.0 * n).floor() as u32;
+    let y: u32 = ((1.0 - lat_rad.tan().asinh() / std::f64::consts::PI) / 2.0 * n).floor() as u32;
+    (x, y)
+}
+
+/// Downloads a tile from AWS Terrain Tiles service
+fn download_tile(
+    client: &reqwest::blocking::Client,
+    tile_x: u32,
+    tile_y: u32,
+    zoom: u8,
+    tile_path: &Path,
+) -> Result<image::ImageBuffer<Rgb<u8>, Vec<u8>>, Box<dyn std::error::Error>> {
+    println!("Fetching tile x={tile_x},y={tile_y},z={zoom} from AWS Terrain Tiles");
+    let url: String = AWS_TERRARIUM_URL
+        .replace("{z}", &zoom.to_string())
+        .replace("{x}", &tile_x.to_string())
+        .replace("{y}", &tile_y.to_string());
+
+    let response: reqwest::blocking::Response = client.get(&url).send()?;
+    response.error_for_status_ref()?;
+    let bytes = response.bytes()?;
+    std::fs::write(tile_path, &bytes)?;
+    let img: image::DynamicImage = image::load_from_memory(&bytes)?;
+    Ok(img.to_rgb8())
+}
+
+pub fn fetch_elevation_data(
+    bbox: &LLBBox,
+    scale: f64,
+    ground_level: i32,
+) -> Result<ElevationData, Box<dyn std::error::Error>> {
+    let (base_scale_z, base_scale_x) = geo_distance(bbox.min(), bbox.max());
+
+    // Apply same floor() and scale operations as CoordTransformer.llbbox_to_xzbbox()
+    let scale_factor_z: f64 = base_scale_z.floor() * scale;
+    let scale_factor_x: f64 = base_scale_x.floor() * scale;
+
+    // Calculate zoom and tiles
+    let zoom: u8 = calculate_zoom_level(bbox);
+    let tiles: Vec<(u32, u32)> = get_tile_coordinates(bbox, zoom);
+
+    // Match grid dimensions with Minecraft world size
+    let grid_width: usize = scale_factor_x as usize;
+    let grid_height: usize = scale_factor_z as usize;
+
+    // Initialize height grid with proper dimensions
+    let mut height_grid: Vec<Vec<f64>> = vec![vec![f64::NAN; grid_width]; grid_height];
+    let mut extreme_values_found = Vec::new(); // Track extreme values for debugging
+
+    let client: reqwest::blocking::Client = reqwest::blocking::Client::new();
+
+    let tile_cache_dir = Path::new("./arnis-tile-cache");
+    if !tile_cache_dir.exists() {
+        std::fs::create_dir_all(tile_cache_dir)?;
+    }
+
+    // Fetch and process each tile
+    for (tile_x, tile_y) in &tiles {
+        // Check if tile is already cached
+        let tile_path = tile_cache_dir.join(format!("z{zoom}_x{tile_x}_y{tile_y}.png"));
+
+        let rgb_img: image::ImageBuffer<Rgb<u8>, Vec<u8>> = if tile_path.exists() {
+            // Check if the cached file has a reasonable size (PNG files should be at least a few KB)
+            let file_size = match std::fs::metadata(&tile_path) {
+                Ok(metadata) => metadata.len(),
+                Err(_) => 0,
+            };
+
+            if file_size < 1000 {
+                eprintln!(
+                    "Warning: Cached tile at {} appears to be too small ({} bytes). Refetching tile.",
+                    tile_path.display(),
+                    file_size
+                );
+                #[cfg(feature = "gui")]
+                send_log(
+                    LogLevel::Warning,
+                    "Cached tile appears to be too small. Refetching tile.",
+                );
+
+                // Remove the potentially corrupted file
+                if let Err(remove_err) = std::fs::remove_file(&tile_path) {
+                    eprintln!(
+                        "Warning: Failed to remove corrupted tile file: {}",
+                        remove_err
+                    );
+                    #[cfg(feature = "gui")]
+                    send_log(
+                        LogLevel::Warning,
+                        "Failed to remove corrupted tile file during refetching.",
+                    );
+                }
+
+                // Re-download the tile
+                download_tile(&client, *tile_x, *tile_y, zoom, &tile_path)?
+            } else {
+                println!(
+                    "Loading cached tile x={tile_x},y={tile_y},z={zoom} from {}",
+                    tile_path.display()
+                );
+
+                // Try to load cached tile, but handle corruption gracefully
+                match image::open(&tile_path) {
+                    Ok(img) => img.to_rgb8(),
+                    Err(e) => {
+                        eprintln!(
+                            "Cached tile at {} is corrupted or invalid: {}. Re-downloading...",
+                            tile_path.display(),
+                            e
+                        );
+                        #[cfg(feature = "gui")]
+                        send_log(
+                            LogLevel::Warning,
+                            "Cached tile is corrupted or invalid. Re-downloading...",
+                        );
+
+                        // Remove the corrupted file
+                        if let Err(remove_err) = std::fs::remove_file(&tile_path) {
+                            eprintln!(
+                                "Warning: Failed to remove corrupted tile file: {}",
+                                remove_err
+                            );
+                            #[cfg(feature = "gui")]
+                            send_log(
+                                LogLevel::Warning,
+                                "Failed to remove corrupted tile file during re-download.",
+                            );
+                        }
+
+                        // Re-download the tile
+                        download_tile(&client, *tile_x, *tile_y, zoom, &tile_path)?
+                    }
+                }
+            }
+        } else {
+            // Download the tile for the first time
+            download_tile(&client, *tile_x, *tile_y, zoom, &tile_path)?
+        };
+
+        // Only process pixels that fall within the requested bbox
+        for (y, row) in rgb_img.rows().enumerate() {
+            for (x, pixel) in row.enumerate() {
+                // Convert tile pixel coordinates back to geographic coordinates
+                let pixel_lng = ((*tile_x as f64 + x as f64 / 256.0) / (2.0_f64.powi(zoom as i32)))
+                    * 360.0
+                    - 180.0;
+                let pixel_lat_rad = std::f64::consts::PI
+                    * (1.0
+                        - 2.0 * (*tile_y as f64 + y as f64 / 256.0) / (2.0_f64.powi(zoom as i32)));
+                let pixel_lat = pixel_lat_rad.sinh().atan().to_degrees();
+
+                // Skip pixels outside the requested bounding box
+                if pixel_lat < bbox.min().lat()
+                    || pixel_lat > bbox.max().lat()
+                    || pixel_lng < bbox.min().lng()
+                    || pixel_lng > bbox.max().lng()
+                {
+                    continue;
+                }
+
+                // Map geographic coordinates to grid coordinates
+                let rel_x = (pixel_lng - bbox.min().lng()) / (bbox.max().lng() - bbox.min().lng());
+                let rel_y =
+                    1.0 - (pixel_lat - bbox.min().lat()) / (bbox.max().lat() - bbox.min().lat());
+
+                let scaled_x = (rel_x * grid_width as f64).round() as usize;
+                let scaled_y = (rel_y * grid_height as f64).round() as usize;
+
+                if scaled_y >= grid_height || scaled_x >= grid_width {
+                    continue;
+                }
+
+                // Decode Terrarium format: (R * 256 + G + B/256) - 32768
+                let height: f64 =
+                    (pixel[0] as f64 * 256.0 + pixel[1] as f64 + pixel[2] as f64 / 256.0)
+                        - TERRARIUM_OFFSET;
+
+                // Track extreme values for debugging
+                if !(-1000.0..=10000.0).contains(&height) {
+                    extreme_values_found
+                        .push((tile_x, tile_y, x, y, pixel[0], pixel[1], pixel[2], height));
+                    if extreme_values_found.len() <= 5 {
+                        // Only log first 5 extreme values
+                        eprintln!("Extreme value found: tile({tile_x},{tile_y}) pixel({x},{y}) RGB({},{},{}) = {height}m", 
+                                 pixel[0], pixel[1], pixel[2]);
+                    }
+                }
+
+                height_grid[scaled_y][scaled_x] = height;
+            }
+        }
+    }
+
+    // Report on extreme values found
+    if !extreme_values_found.is_empty() {
+        eprintln!(
+            "Found {} total extreme elevation values during tile processing",
+            extreme_values_found.len()
+        );
+        eprintln!("This may indicate corrupted tile data or areas with invalid elevation data");
+    }
+
+    // Fill in any NaN values by interpolating from nearest valid values
+    fill_nan_values(&mut height_grid);
+
+    // Filter extreme outliers that might be due to corrupted tile data
+    filter_elevation_outliers(&mut height_grid);
+
+    // Calculate blur sigma based on grid resolution
+    // Reference points for tuning:
+    const SMALL_GRID_REF: f64 = 100.0; // Reference grid size
+    const SMALL_SIGMA_REF: f64 = 15.0; // Sigma for 100x100 grid
+    const LARGE_GRID_REF: f64 = 1000.0; // Reference grid size
+    const LARGE_SIGMA_REF: f64 = 7.0; // Sigma for 1000x1000 grid
+
+    let grid_size: f64 = (grid_width.min(grid_height) as f64).max(1.0);
+
+    let sigma: f64 = if grid_size <= SMALL_GRID_REF {
+        // Linear scaling for small grids
+        SMALL_SIGMA_REF * (grid_size / SMALL_GRID_REF)
+    } else {
+        // Logarithmic scaling for larger grids
+        let ln_small: f64 = SMALL_GRID_REF.ln();
+        let ln_large: f64 = LARGE_GRID_REF.ln();
+        let log_grid_size: f64 = grid_size.ln();
+        let t: f64 = (log_grid_size - ln_small) / (ln_large - ln_small);
+        SMALL_SIGMA_REF + t * (LARGE_SIGMA_REF - SMALL_SIGMA_REF)
+    };
+
+    /* eprintln!(
+        "Grid: {}x{}, Blur sigma: {:.2}",
+        grid_width, grid_height, sigma
+    ); */
+
+    // Continue with the existing blur and conversion to Minecraft heights...
+    let blurred_heights: Vec<Vec<f64>> = apply_gaussian_blur(&height_grid, sigma);
+
+    let mut mc_heights: Vec<Vec<i32>> = Vec::with_capacity(blurred_heights.len());
+
+    // Find min/max in raw data
+    let mut min_height: f64 = f64::MAX;
+    let mut max_height: f64 = f64::MIN;
+    let mut extreme_low_count = 0;
+    let mut extreme_high_count = 0;
+
+    for row in &blurred_heights {
+        for &height in row {
+            min_height = min_height.min(height);
+            max_height = max_height.max(height);
+
+            // Count extreme values that might indicate data issues
+            if height < -1000.0 {
+                extreme_low_count += 1;
+            }
+            if height > 10000.0 {
+                extreme_high_count += 1;
+            }
+        }
+    }
+
+    eprintln!("Height data range: {min_height} to {max_height} m");
+    if extreme_low_count > 0 {
+        eprintln!(
+            "WARNING: Found {extreme_low_count} pixels with extremely low elevations (< -1000m)"
+        );
+    }
+    if extreme_high_count > 0 {
+        eprintln!(
+            "WARNING: Found {extreme_high_count} pixels with extremely high elevations (> 10000m)"
+        );
+    }
+
+    let height_range: f64 = max_height - min_height;
+    // Apply scale factor to height scaling
+    let mut height_scale: f64 = BASE_HEIGHT_SCALE * scale.sqrt(); // sqrt to make height scaling less extreme
+    let mut scaled_range: f64 = height_range * height_scale;
+
+    // Adaptive scaling: ensure we don't exceed reasonable Y range
+    let available_y_range = (MAX_Y - ground_level) as f64;
+    let safety_margin = 0.9; // Use 90% of available range
+    let max_allowed_range = available_y_range * safety_margin;
+
+    if scaled_range > max_allowed_range {
+        let adjustment_factor = max_allowed_range / scaled_range;
+        height_scale *= adjustment_factor;
+        scaled_range = height_range * height_scale;
+        eprintln!(
+            "Height range too large, applying scaling adjustment factor: {adjustment_factor:.3}"
+        );
+        eprintln!("Adjusted scaled range: {scaled_range:.1} blocks");
+    }
+
+    // Convert to scaled Minecraft Y coordinates
+    for row in blurred_heights {
+        let mc_row: Vec<i32> = row
+            .iter()
+            .map(|&h| {
+                // Scale the height differences
+                let relative_height: f64 = (h - min_height) / height_range;
+                let scaled_height: f64 = relative_height * scaled_range;
+                // With terrain enabled, ground_level is used as the MIN_Y for terrain
+                ((ground_level as f64 + scaled_height).round() as i32).clamp(ground_level, MAX_Y)
+            })
+            .collect();
+        mc_heights.push(mc_row);
+    }
+
+    let mut min_block_height: i32 = i32::MAX;
+    let mut max_block_height: i32 = i32::MIN;
+    for row in &mc_heights {
+        for &height in row {
+            min_block_height = min_block_height.min(height);
+            max_block_height = max_block_height.max(height);
+        }
+    }
+    eprintln!("Minecraft height data range: {min_block_height} to {max_block_height} blocks");
+
+    Ok(ElevationData {
+        heights: mc_heights,
+        width: grid_width,
+        height: grid_height,
+    })
+}
+
+fn get_tile_coordinates(bbox: &LLBBox, zoom: u8) -> Vec<(u32, u32)> {
+    // Convert lat/lng to tile coordinates
+    let (x1, y1) = lat_lng_to_tile(bbox.min().lat(), bbox.min().lng(), zoom);
+    let (x2, y2) = lat_lng_to_tile(bbox.max().lat(), bbox.max().lng(), zoom);
+
+    let mut tiles: Vec<(u32, u32)> = Vec::new();
+    for x in x1.min(x2)..=x1.max(x2) {
+        for y in y1.min(y2)..=y1.max(y2) {
+            tiles.push((x, y));
+        }
+    }
+    tiles
+}
+
+fn apply_gaussian_blur(heights: &[Vec<f64>], sigma: f64) -> Vec<Vec<f64>> {
+    let kernel_size: usize = (sigma * 3.0).ceil() as usize * 2 + 1;
+    let kernel: Vec<f64> = create_gaussian_kernel(kernel_size, sigma);
+
+    // Apply blur
+    let mut blurred: Vec<Vec<f64>> = heights.to_owned();
+
+    // Horizontal pass
+    for row in blurred.iter_mut() {
+        let mut temp: Vec<f64> = row.clone();
+        for (i, val) in temp.iter_mut().enumerate() {
+            let mut sum: f64 = 0.0;
+            let mut weight_sum: f64 = 0.0;
+            for (j, k) in kernel.iter().enumerate() {
+                let idx: i32 = i as i32 + j as i32 - kernel_size as i32 / 2;
+                if idx >= 0 && idx < row.len() as i32 {
+                    sum += row[idx as usize] * k;
+                    weight_sum += k;
+                }
+            }
+            *val = sum / weight_sum;
+        }
+        *row = temp;
+    }
+
+    // Vertical pass
+    let height: usize = blurred.len();
+    let width: usize = blurred[0].len();
+    for x in 0..width {
+        let temp: Vec<_> = blurred
+            .iter()
+            .take(height)
+            .map(|row: &Vec<f64>| row[x])
+            .collect();
+
+        for (y, row) in blurred.iter_mut().enumerate().take(height) {
+            let mut sum: f64 = 0.0;
+            let mut weight_sum: f64 = 0.0;
+            for (j, k) in kernel.iter().enumerate() {
+                let idx: i32 = y as i32 + j as i32 - kernel_size as i32 / 2;
+                if idx >= 0 && idx < height as i32 {
+                    sum += temp[idx as usize] * k;
+                    weight_sum += k;
+                }
+            }
+            row[x] = sum / weight_sum;
+        }
+    }
+
+    blurred
+}
+
+fn create_gaussian_kernel(size: usize, sigma: f64) -> Vec<f64> {
+    let mut kernel: Vec<f64> = vec![0.0; size];
+    let center: f64 = size as f64 / 2.0;
+
+    for (i, value) in kernel.iter_mut().enumerate() {
+        let x: f64 = i as f64 - center;
+        *value = (-x * x / (2.0 * sigma * sigma)).exp();
+    }
+
+    let sum: f64 = kernel.iter().sum();
+    for k in kernel.iter_mut() {
+        *k /= sum;
+    }
+
+    kernel
+}
+
+fn fill_nan_values(height_grid: &mut [Vec<f64>]) {
+    let height: usize = height_grid.len();
+    let width: usize = height_grid[0].len();
+
+    let mut changes_made: bool = true;
+    while changes_made {
+        changes_made = false;
+
+        for y in 0..height {
+            for x in 0..width {
+                if height_grid[y][x].is_nan() {
+                    let mut sum: f64 = 0.0;
+                    let mut count: i32 = 0;
+
+                    // Check neighboring cells
+                    for dy in -1..=1 {
+                        for dx in -1..=1 {
+                            let ny: i32 = y as i32 + dy;
+                            let nx: i32 = x as i32 + dx;
+
+                            if ny >= 0 && ny < height as i32 && nx >= 0 && nx < width as i32 {
+                                let val: f64 = height_grid[ny as usize][nx as usize];
+                                if !val.is_nan() {
+                                    sum += val;
+                                    count += 1;
+                                }
+                            }
+                        }
+                    }
+
+                    if count > 0 {
+                        height_grid[y][x] = sum / count as f64;
+                        changes_made = true;
+                    }
+                }
+            }
+        }
+    }
+}
+
+fn filter_elevation_outliers(height_grid: &mut [Vec<f64>]) {
+    let height = height_grid.len();
+    let width = height_grid[0].len();
+
+    // Collect all valid height values to calculate statistics
+    let mut all_heights: Vec<f64> = Vec::new();
+    for row in height_grid.iter() {
+        for &h in row {
+            if !h.is_nan() && h.is_finite() {
+                all_heights.push(h);
+            }
+        }
+    }
+
+    if all_heights.is_empty() {
+        return;
+    }
+
+    // Sort to find percentiles
+    all_heights.sort_by(|a, b| a.partial_cmp(b).unwrap());
+    let len = all_heights.len();
+
+    // Use 1st and 99th percentiles to define reasonable bounds
+    let p1_idx = (len as f64 * 0.01) as usize;
+    let p99_idx = (len as f64 * 0.99) as usize;
+    let min_reasonable = all_heights[p1_idx];
+    let max_reasonable = all_heights[p99_idx];
+
+    eprintln!("Filtering outliers outside range: {min_reasonable:.1}m to {max_reasonable:.1}m");
+
+    let mut outliers_filtered = 0;
+
+    // Replace outliers with NaN, then fill them using interpolation
+    for row in height_grid.iter_mut().take(height) {
+        for h in row.iter_mut().take(width) {
+            if !h.is_nan() && (*h < min_reasonable || *h > max_reasonable) {
+                *h = f64::NAN;
+                outliers_filtered += 1;
+            }
+        }
+    }
+
+    if outliers_filtered > 0 {
+        eprintln!("Filtered {outliers_filtered} elevation outliers, interpolating replacements...");
+        // Re-run the NaN filling to interpolate the filtered values
+        fill_nan_values(height_grid);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_terrarium_height_decoding() {
+        // Test known Terrarium RGB values
+        // Sea level (0m) in Terrarium format should be (128, 0, 0) = 32768 - 32768 = 0
+        let sea_level_pixel = [128, 0, 0];
+        let height = (sea_level_pixel[0] as f64 * 256.0
+            + sea_level_pixel[1] as f64
+            + sea_level_pixel[2] as f64 / 256.0)
+            - TERRARIUM_OFFSET;
+        assert_eq!(height, 0.0);
+
+        // Test simple case: height of 1000m
+        // 1000 + 32768 = 33768 = 131 * 256 + 232
+        let test_pixel = [131, 232, 0];
+        let height =
+            (test_pixel[0] as f64 * 256.0 + test_pixel[1] as f64 + test_pixel[2] as f64 / 256.0)
+                - TERRARIUM_OFFSET;
+        assert_eq!(height, 1000.0);
+
+        // Test below sea level (-100m)
+        // -100 + 32768 = 32668 = 127 * 256 + 156
+        let below_sea_pixel = [127, 156, 0];
+        let height = (below_sea_pixel[0] as f64 * 256.0
+            + below_sea_pixel[1] as f64
+            + below_sea_pixel[2] as f64 / 256.0)
+            - TERRARIUM_OFFSET;
+        assert_eq!(height, -100.0);
+    }
+
+    #[test]
+    fn test_aws_url_generation() {
+        let url = AWS_TERRARIUM_URL
+            .replace("{z}", "15")
+            .replace("{x}", "17436")
+            .replace("{y}", "11365");
+        assert_eq!(
+            url,
+            "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/15/17436/11365.png"
+        );
+    }
+
+    #[test]
+    #[ignore] // This test requires internet connection, run with --ignored
+    fn test_aws_tile_fetch() {
+        use reqwest::blocking::Client;
+
+        let client = Client::new();
+        let url = "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/15/17436/11365.png";
+
+        let response = client.get(url).send();
+        assert!(response.is_ok());
+
+        let response = response.unwrap();
+        assert!(response.status().is_success());
+        assert!(response
+            .headers()
+            .get("content-type")
+            .unwrap()
+            .to_str()
+            .unwrap()
+            .contains("image"));
+    }
+}

src/floodfill.rs

@@ -3,8 +3,8 @@ use itertools::Itertools;
 use std::collections::{HashSet, VecDeque};
 use std::time::{Duration, Instant};
 
-/// Perform a flood-fill to find the area inside a polygon.
-/// Returns a vector of (x, z) coordinates representing the filled area.
+/// Main flood fill function with automatic algorithm selection
+/// Chooses the best algorithm based on polygon size and complexity
 pub fn flood_fill_area(
     polygon_coords: &[(i32, i32)],
     timeout: Option<&Duration>,
@@ -13,8 +13,6 @@ pub fn flood_fill_area(
         return vec![]; // Not a valid polygon
     }
 
-    let start_time: Instant = Instant::now();
-
     // Calculate bounding box of the polygon using itertools
     let (min_x, max_x) = polygon_coords
         .iter()
@@ -29,73 +27,184 @@ pub fn flood_fill_area(
         .into_option()
         .unwrap();
 
-    let mut filled_area: Vec<(i32, i32)> = Vec::new();
-    let mut visited: HashSet<(i32, i32)> = HashSet::new();
+    let area = (max_x - min_x + 1) as i64 * (max_z - min_z + 1) as i64;
 
-    // Convert input to a geo::Polygon for efficient point-in-polygon testing
+    // For small and medium areas, use optimized flood fill with span filling
+    if area < 50000 {
+        optimized_flood_fill_area(polygon_coords, timeout, min_x, max_x, min_z, max_z)
+    } else {
+        // For larger areas, use original flood fill with grid sampling
+        original_flood_fill_area(polygon_coords, timeout, min_x, max_x, min_z, max_z)
+    }
+}
+
+/// Optimized flood fill for larger polygons with multi-seed detection for complex shapes like U-shapes
+fn optimized_flood_fill_area(
+    polygon_coords: &[(i32, i32)],
+    timeout: Option<&Duration>,
+    min_x: i32,
+    max_x: i32,
+    min_z: i32,
+    max_z: i32,
+) -> Vec<(i32, i32)> {
+    let start_time = Instant::now();
+
+    let mut filled_area = Vec::new();
+    let mut global_visited = HashSet::new();
+
+    // Create polygon for containment testing
     let exterior_coords: Vec<(f64, f64)> = polygon_coords
         .iter()
         .map(|&(x, z)| (x as f64, z as f64))
-        .collect::<Vec<_>>();
-    let exterior: LineString = LineString::from(exterior_coords); // Create LineString from coordinates
-    let polygon: Polygon<f64> = Polygon::new(exterior, vec![]); // Create Polygon using LineString
+        .collect();
+    let exterior = LineString::from(exterior_coords);
+    let polygon = Polygon::new(exterior, vec![]);
 
-    // Determine safe step sizes for grid sampling
-    let step_x: i32 = ((max_x - min_x) / 10).max(1); // Ensure step is at least 1
-    let step_z: i32 = ((max_z - min_z) / 10).max(1); // Ensure step is at least 1
+    // Optimized step sizes: larger steps for efficiency, but still catch U-shapes
+    let width = max_x - min_x + 1;
+    let height = max_z - min_z + 1;
+    let step_x = (width / 6).clamp(1, 8); // Balance between coverage and speed
+    let step_z = (height / 6).clamp(1, 8);
 
-    // Sample multiple starting points within the bounding box
-    let mut candidate_points: VecDeque<(i32, i32)> = VecDeque::new();
-    for x in (min_x..=max_x).step_by(step_x as usize) {
-        for z in (min_z..=max_z).step_by(step_z as usize) {
-            candidate_points.push_back((x, z));
-        }
-    }
+    // Pre-allocate queue with reasonable capacity to avoid reallocations
+    let mut queue = VecDeque::with_capacity(1024);
 
-    // Attempt flood-fill from each candidate point
-    while let Some((start_x, start_z)) = candidate_points.pop_front() {
-        if let Some(timeout) = timeout {
-            if &start_time.elapsed() > timeout {
-                eprintln!("Floodfill timeout");
-                break;
-            }
-        }
-
-        if polygon.contains(&Point::new(start_x as f64, start_z as f64)) {
-            // Start flood-fill from the valid interior point
-            let mut queue: VecDeque<(i32, i32)> = VecDeque::new();
-            queue.push_back((start_x, start_z));
-            visited.insert((start_x, start_z));
-
-            while let Some((x, z)) = queue.pop_front() {
+    for z in (min_z..=max_z).step_by(step_z as usize) {
+        for x in (min_x..=max_x).step_by(step_x as usize) {
+            // Fast timeout check, only every few iterations
+            if filled_area.len() % 100 == 0 {
                 if let Some(timeout) = timeout {
-                    if &start_time.elapsed() > timeout {
-                        eprintln!("Floodfill timeout");
-                        break;
+                    if start_time.elapsed() > *timeout {
+                        return filled_area;
                     }
                 }
+            }
 
-                if polygon.contains(&Point::new(x as f64, z as f64)) {
-                    filled_area.push((x, z));
+            // Skip if already visited or not inside polygon
+            if global_visited.contains(&(x, z))
+                || !polygon.contains(&Point::new(x as f64, z as f64))
+            {
+                continue;
+            }
 
-                    // Check adjacent points
-                    for (nx, nz) in [(x - 1, z), (x + 1, z), (x, z - 1), (x, z + 1)].iter() {
-                        if *nx >= min_x
-                            && *nx <= max_x
-                            && *nz >= min_z
-                            && *nz <= max_z
-                            && !visited.contains(&(*nx, *nz))
-                        {
-                            visited.insert((*nx, *nz));
+            // Start flood fill from this seed point
+            queue.clear(); // Reuse queue instead of creating new one
+            queue.push_back((x, z));
+            global_visited.insert((x, z));
+
+            while let Some((curr_x, curr_z)) = queue.pop_front() {
+                // Add current point to filled area
+                filled_area.push((curr_x, curr_z));
+
+                // Check all four directions with optimized bounds checking
+                let neighbors = [
+                    (curr_x - 1, curr_z),
+                    (curr_x + 1, curr_z),
+                    (curr_x, curr_z - 1),
+                    (curr_x, curr_z + 1),
+                ];
+
+                for (nx, nz) in neighbors.iter() {
+                    if *nx >= min_x
+                        && *nx <= max_x
+                        && *nz >= min_z
+                        && *nz <= max_z
+                        && !global_visited.contains(&(*nx, *nz))
+                    {
+                        // Only check polygon containment for unvisited points
+                        if polygon.contains(&Point::new(*nx as f64, *nz as f64)) {
+                            global_visited.insert((*nx, *nz));
+                            queue.push_back((*nx, *nz));
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    filled_area
+}
+
+/// Original flood fill algorithm with enhanced multi-seed detection for complex shapes
+fn original_flood_fill_area(
+    polygon_coords: &[(i32, i32)],
+    timeout: Option<&Duration>,
+    min_x: i32,
+    max_x: i32,
+    min_z: i32,
+    max_z: i32,
+) -> Vec<(i32, i32)> {
+    let start_time = Instant::now();
+    let mut filled_area: Vec<(i32, i32)> = Vec::new();
+    let mut global_visited: HashSet<(i32, i32)> = HashSet::new();
+
+    // Convert input to a geo::Polygon for efficient point-in-polygon testing
+    let exterior_coords: Vec<(f64, f64)> = polygon_coords
+        .iter()
+        .map(|&(x, z)| (x as f64, z as f64))
+        .collect::<Vec<_>>();
+    let exterior: LineString = LineString::from(exterior_coords);
+    let polygon: Polygon<f64> = Polygon::new(exterior, vec![]);
+
+    // Optimized step sizes for large polygons - coarser sampling for speed
+    let width = max_x - min_x + 1;
+    let height = max_z - min_z + 1;
+    let step_x: i32 = (width / 8).clamp(1, 12); // Cap max step size for coverage
+    let step_z: i32 = (height / 8).clamp(1, 12);
+
+    // Pre-allocate queue and reserve space for filled_area
+    let mut queue: VecDeque<(i32, i32)> = VecDeque::with_capacity(2048);
+    filled_area.reserve(1000); // Reserve space to reduce reallocations
+
+    // Scan for multiple seed points to handle U-shapes and concave polygons
+    for z in (min_z..=max_z).step_by(step_z as usize) {
+        for x in (min_x..=max_x).step_by(step_x as usize) {
+            // Reduced timeout checking frequency for better performance
+            // Use manual % check since is_multiple_of() is unstable on stable Rust
+            if let Some(timeout) = timeout {
+                if &start_time.elapsed() > timeout {
+                    return filled_area;
+                }
+            }
+
+            // Skip if already processed or not inside polygon
+            if global_visited.contains(&(x, z))
+                || !polygon.contains(&Point::new(x as f64, z as f64))
+            {
+                continue;
+            }
+
+            // Start flood-fill from this seed point
+            queue.clear(); // Reuse queue
+            queue.push_back((x, z));
+            global_visited.insert((x, z));
+
+            while let Some((curr_x, curr_z)) = queue.pop_front() {
+                // Only check polygon containment once per point when adding to filled_area
+                if polygon.contains(&Point::new(curr_x as f64, curr_z as f64)) {
+                    filled_area.push((curr_x, curr_z));
+
+                    // Check adjacent points with optimized iteration
+                    let neighbors = [
+                        (curr_x - 1, curr_z),
+                        (curr_x + 1, curr_z),
+                        (curr_x, curr_z - 1),
+                        (curr_x, curr_z + 1),
+                    ];
+
+                    for (nx, nz) in neighbors.iter() {
+                        if *nx >= min_x
+                            && *nx <= max_x
+                            && *nz >= min_z
+                            && *nz <= max_z
+                            && !global_visited.contains(&(*nx, *nz))
+                        {
+                            global_visited.insert((*nx, *nz));
                             queue.push_back((*nx, *nz));
                         }
                     }
                 }
             }
-
-            if !filled_area.is_empty() {
-                break; // Exit if a valid area has been flood-filled
-            }
         }
     }
 

src/ground.rs

@@ -1,63 +1,44 @@
-use crate::cartesian::XZPoint;
+use crate::args::Args;
+use crate::coordinate_system::{cartesian::XZPoint, geographic::LLBBox};
+use crate::elevation_data::{fetch_elevation_data, ElevationData};
+use crate::progress::emit_gui_progress_update;
+use colored::Colorize;
 use image::{Rgb, RgbImage};
 
-/// Minimum Y coordinate in Minecraft (bedrock level)
-const MIN_Y: i32 = -62;
-/// Maximum Y coordinate in Minecraft (build height limit)
-const MAX_Y: i32 = 256;
-/// Scale factor for converting real elevation to Minecraft heights
-const BASE_HEIGHT_SCALE: f64 = 0.6;
-/// Mapbox API access token for terrain data
-const MAPBOX_PUBKEY: &str =
-    "pk.eyJ1IjoiY3Vnb3MiLCJhIjoiY2p4Nm43MzA3MDFmZDQwcGxsMjB4Z3hnNiJ9.SQbnMASwdqZe6G4n6OMvVw";
-/// Minimum zoom level for terrain tiles
-const MIN_ZOOM: u8 = 10;
-/// Maximum zoom level for terrain tiles
-const MAX_ZOOM: u8 = 15;
-
 /// Represents terrain data and elevation settings
+#[derive(Clone)]
 pub struct Ground {
     pub elevation_enabled: bool,
     ground_level: i32,
     elevation_data: Option<ElevationData>,
 }
 
-/// Holds processed elevation data and metadata
-#[derive(Clone)]
-struct ElevationData {
-    /// Height values in Minecraft Y coordinates
-    heights: Vec<Vec<i32>>,
-    /// Width of the elevation grid
-    width: usize,
-    /// Height of the elevation grid
-    height: usize,
-}
-
 impl Ground {
-    pub fn new(args: &crate::args::Args) -> Self {
-        let mut elevation_enabled: bool = args.terrain;
-        let elevation_data: Option<ElevationData> = if elevation_enabled && args.bbox.is_some() {
-            match Self::fetch_elevation_data(args.bbox.as_deref().unwrap(), args.scale) {
-                Ok(data) => {
-                    if args.debug {
-                        Self::save_debug_image(&data.heights, "elevation_debug");
-                    }
-                    Some(data)
-                }
-                Err(e) => {
-                    eprintln!("Warning: Failed to fetch elevation data: {}", e);
-                    elevation_enabled = false;
-                    None
+    pub fn new_flat(ground_level: i32) -> Self {
+        Self {
+            elevation_enabled: false,
+            ground_level,
+            elevation_data: None,
+        }
+    }
+
+    pub fn new_enabled(bbox: &LLBBox, scale: f64, ground_level: i32) -> Self {
+        match fetch_elevation_data(bbox, scale, ground_level) {
+            Ok(elevation_data) => Self {
+                elevation_enabled: true,
+                ground_level,
+                elevation_data: Some(elevation_data),
+            },
+            Err(e) => {
+                eprintln!("Failed to fetch elevation data: {}", e);
+                emit_gui_progress_update(15.0, "Elevation unavailable, using flat ground");
+                // Graceful fallback: disable elevation and keep provided ground_level
+                Self {
+                    elevation_enabled: false,
+                    ground_level,
+                    elevation_data: None,
                 }
             }
-        } else {
-            None
-        };
-
-        Self {
-            elevation_enabled,
-            ground_level: args.ground_level,
-            elevation_data,
         }
     }
 
@@ -73,6 +54,7 @@ impl Ground {
         self.interpolate_height(x_ratio, z_ratio, data)
     }
 
+    #[allow(unused)]
     #[inline(always)]
     pub fn min_level<I: Iterator<Item = XZPoint>>(&self, coords: I) -> Option<i32> {
         if !self.elevation_enabled {
@@ -81,6 +63,7 @@ impl Ground {
         coords.map(|c: XZPoint| self.level(c)).min()
     }
 
+    #[allow(unused)]
     #[inline(always)]
     pub fn max_level<I: Iterator<Item = XZPoint>>(&self, coords: I) -> Option<i32> {
         if !self.elevation_enabled {
@@ -105,280 +88,12 @@ impl Ground {
         data.heights[z][x]
     }
 
-    /// Calculates appropriate zoom level for the given bounding box
-    fn calculate_zoom_level(bbox: (f64, f64, f64, f64)) -> u8 {
-        let lat_diff: f64 = (bbox.2 - bbox.0).abs();
-        let lng_diff: f64 = (bbox.3 - bbox.1).abs();
-        let max_diff: f64 = lat_diff.max(lng_diff);
-        let zoom: u8 = (-max_diff.log2() + 20.0) as u8;
-        zoom.clamp(MIN_ZOOM, MAX_ZOOM)
-    }
-
-    fn lat_lng_to_tile(lat: f64, lng: f64, zoom: u8) -> (u32, u32) {
-        let lat_rad: f64 = lat.to_radians();
-        let n: f64 = 2.0_f64.powi(zoom as i32);
-        let x: u32 = ((lng + 180.0) / 360.0 * n).floor() as u32;
-        let y: u32 =
-            ((1.0 - lat_rad.tan().asinh() / std::f64::consts::PI) / 2.0 * n).floor() as u32;
-        (x, y)
-    }
-
-    fn fetch_elevation_data(
-        bbox_str: &str,
-        scale: f64,
-    ) -> Result<ElevationData, Box<dyn std::error::Error>> {
-        let coords: Vec<f64> = bbox_str
-            .split_whitespace()
-            .map(|s: &str| s.parse::<f64>())
-            .collect::<Result<Vec<f64>, _>>()?;
-
-        let (min_lat, min_lng, max_lat, max_lng) = (coords[0], coords[1], coords[2], coords[3]);
-
-        // Use OSM parser's scale calculation and apply user scale factor
-        let (scale_factor_z, scale_factor_x) =
-            crate::osm_parser::geo_distance(min_lat, max_lat, min_lng, max_lng);
-        let scale_factor_x: f64 = scale_factor_x * scale;
-        let scale_factor_z: f64 = scale_factor_z * scale;
-
-        // Calculate zoom and tiles
-        let zoom: u8 = Self::calculate_zoom_level((min_lat, min_lng, max_lat, max_lng));
-        let tiles: Vec<(u32, u32)> =
-            Self::get_tile_coordinates(min_lat, min_lng, max_lat, max_lng, zoom);
-
-        // Calculate tile boundaries
-        let x_min: &u32 = tiles.iter().map(|(x, _)| x).min().unwrap();
-        let x_max: &u32 = tiles.iter().map(|(x, _)| x).max().unwrap();
-        let y_min: &u32 = tiles.iter().map(|(_, y)| y).min().unwrap();
-        let y_max: &u32 = tiles.iter().map(|(_, y)| y).max().unwrap();
-
-        // Match grid dimensions with Minecraft world size
-        let grid_width: usize = scale_factor_x.round() as usize;
-        let grid_height: usize = scale_factor_z.round() as usize;
-
-        // Calculate total tile dimensions
-        let total_tile_width: u32 = (x_max - x_min + 1) * 256;
-        let total_tile_height: u32 = (y_max - y_min + 1) * 256;
-
-        // Calculate scaling factors to match the desired grid dimensions
-        let x_scale: f64 = grid_width as f64 / total_tile_width as f64;
-        let y_scale: f64 = grid_height as f64 / total_tile_height as f64;
-
-        // Initialize height grid with proper dimensions
-        let mut height_grid: Vec<Vec<f64>> = vec![vec![f64::NAN; grid_width]; grid_height];
-
-        let client: reqwest::blocking::Client = reqwest::blocking::Client::new();
-        let access_token: &str = MAPBOX_PUBKEY;
-
-        // Fetch and process each tile
-        for (tile_x, tile_y) in &tiles {
-            let url: String = format!(
-                "https://api.mapbox.com/v4/mapbox.terrain-rgb/{}/{}/{}.pngraw?access_token={}",
-                zoom, tile_x, tile_y, access_token
-            );
-
-            let response: reqwest::blocking::Response = client.get(&url).send()?;
-            let img: image::DynamicImage = image::load_from_memory(&response.bytes()?)?;
-            let rgb_img: image::ImageBuffer<Rgb<u8>, Vec<u8>> = img.to_rgb8();
-
-            // Calculate position in the scaled grid
-            let base_x: f64 = ((*tile_x - x_min) * 256) as f64;
-            let base_y: f64 = ((*tile_y - y_min) * 256) as f64;
-
-            // Process tile data with scaling
-            for (y, row) in rgb_img.rows().enumerate() {
-                for (x, pixel) in row.enumerate() {
-                    let scaled_x: usize = ((base_x + x as f64) * x_scale) as usize;
-                    let scaled_y: usize = ((base_y + y as f64) * y_scale) as usize;
-
-                    if scaled_y >= grid_height || scaled_x >= grid_width {
-                        continue;
-                    }
-
-                    let height: f64 = -10000.0
-                        + ((pixel[0] as f64 * 256.0 * 256.0
-                            + pixel[1] as f64 * 256.0
-                            + pixel[2] as f64)
-                            * 0.1);
-
-                    height_grid[scaled_y][scaled_x] = height;
-                }
-            }
-        }
-
-        // Fill in any NaN values by interpolating from nearest valid values
-        Self::fill_nan_values(&mut height_grid);
-
-        // Continue with the existing blur and conversion to Minecraft heights...
-        let blurred_heights: Vec<Vec<f64>> = Self::apply_gaussian_blur(&height_grid, 1.0);
-
-        let mut mc_heights: Vec<Vec<i32>> = Vec::with_capacity(blurred_heights.len());
-
-        // Find min/max in raw data
-        let mut min_height: f64 = f64::MAX;
-        let mut max_height: f64 = f64::MIN;
-        for row in &blurred_heights {
-            for &height in row {
-                min_height = min_height.min(height);
-                max_height = max_height.max(height);
-            }
-        }
-
-        let height_range: f64 = max_height - min_height;
-        // Apply scale factor to height scaling
-        let height_scale: f64 = BASE_HEIGHT_SCALE * scale.sqrt(); // sqrt to make height scaling less extreme
-        let scaled_range: f64 = height_range * height_scale;
-
-        // Convert to scaled Minecraft Y coordinates
-        for row in blurred_heights {
-            let mc_row: Vec<i32> = row
-                .iter()
-                .map(|&h| {
-                    // Scale the height differences
-                    let relative_height: f64 = (h - min_height) / height_range;
-                    let scaled_height: f64 = relative_height * scaled_range;
-                    ((MIN_Y as f64 + scaled_height).round() as i32).clamp(MIN_Y, MAX_Y)
-                })
-                .collect();
-            mc_heights.push(mc_row);
-        }
-
-        Ok(ElevationData {
-            heights: mc_heights,
-            width: grid_width,
-            height: grid_height,
-        })
-    }
-
-    fn get_tile_coordinates(
-        min_lat: f64,
-        min_lng: f64,
-        max_lat: f64,
-        max_lng: f64,
-        zoom: u8,
-    ) -> Vec<(u32, u32)> {
-        // Convert lat/lng to tile coordinates
-        let (x1, y1) = Self::lat_lng_to_tile(min_lat, min_lng, zoom);
-        let (x2, y2) = Self::lat_lng_to_tile(max_lat, max_lng, zoom);
-
-        let mut tiles: Vec<(u32, u32)> = Vec::new();
-        for x in x1.min(x2)..=x1.max(x2) {
-            for y in y1.min(y2)..=y1.max(y2) {
-                tiles.push((x, y));
-            }
-        }
-        tiles
-    }
-
-    fn apply_gaussian_blur(heights: &[Vec<f64>], sigma: f64) -> Vec<Vec<f64>> {
-        let kernel_size: usize = (sigma * 3.0).ceil() as usize * 2 + 1;
-        let kernel: Vec<f64> = Self::create_gaussian_kernel(kernel_size, sigma);
-
-        // Apply blur
-        let mut blurred: Vec<Vec<f64>> = heights.to_owned();
-
-        // Horizontal pass
-        for row in blurred.iter_mut() {
-            let mut temp: Vec<f64> = row.clone();
-            for (i, val) in temp.iter_mut().enumerate() {
-                let mut sum: f64 = 0.0;
-                let mut weight_sum: f64 = 0.0;
-                for (j, k) in kernel.iter().enumerate() {
-                    let idx: i32 = i as i32 + j as i32 - kernel_size as i32 / 2;
-                    if idx >= 0 && idx < row.len() as i32 {
-                        sum += row[idx as usize] * k;
-                        weight_sum += k;
-                    }
-                }
-                *val = sum / weight_sum;
-            }
-            *row = temp;
-        }
-
-        // Vertical pass
-        let height: usize = blurred.len();
-        let width: usize = blurred[0].len();
-        for x in 0..width {
-            let temp: Vec<_> = blurred
-                .iter()
-                .take(height)
-                .map(|row: &Vec<f64>| row[x])
-                .collect();
-
-            for (y, row) in blurred.iter_mut().enumerate().take(height) {
-                let mut sum: f64 = 0.0;
-                let mut weight_sum: f64 = 0.0;
-                for (j, k) in kernel.iter().enumerate() {
-                    let idx: i32 = y as i32 + j as i32 - kernel_size as i32 / 2;
-                    if idx >= 0 && idx < height as i32 {
-                        sum += temp[idx as usize] * k;
-                        weight_sum += k;
-                    }
-                }
-                row[x] = sum / weight_sum;
-            }
-        }
-
-        blurred
-    }
-
-    fn create_gaussian_kernel(size: usize, sigma: f64) -> Vec<f64> {
-        let mut kernel: Vec<f64> = vec![0.0; size];
-        let center: f64 = size as f64 / 2.0;
-
-        for (i, value) in kernel.iter_mut().enumerate() {
-            let x: f64 = i as f64 - center;
-            *value = (-x * x / (2.0 * sigma * sigma)).exp();
-        }
-
-        let sum: f64 = kernel.iter().sum();
-        for k in kernel.iter_mut() {
-            *k /= sum;
-        }
-
-        kernel
-    }
-
-    fn fill_nan_values(height_grid: &mut [Vec<f64>]) {
-        let height: usize = height_grid.len();
-        let width: usize = height_grid[0].len();
-
-        let mut changes_made: bool = true;
-        while changes_made {
-            changes_made = false;
-
-            for y in 0..height {
-                for x in 0..width {
-                    if height_grid[y][x].is_nan() {
-                        let mut sum: f64 = 0.0;
-                        let mut count: i32 = 0;
-
-                        // Check neighboring cells
-                        for dy in -1..=1 {
-                            for dx in -1..=1 {
-                                let ny: i32 = y as i32 + dy;
-                                let nx: i32 = x as i32 + dx;
-
-                                if ny >= 0 && ny < height as i32 && nx >= 0 && nx < width as i32 {
-                                    let val: f64 = height_grid[ny as usize][nx as usize];
-                                    if !val.is_nan() {
-                                        sum += val;
-                                        count += 1;
-                                    }
-                                }
-                            }
-                        }
-
-                        if count > 0 {
-                            height_grid[y][x] = sum / count as f64;
-                            changes_made = true;
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    fn save_debug_image(heights: &Vec<Vec<i32>>, filename: &str) {
+    fn save_debug_image(&self, filename: &str) {
+        let heights = &self
+            .elevation_data
+            .as_ref()
+            .expect("Elevation data not available")
+            .heights;
         if heights.is_empty() || heights[0].is_empty() {
             return;
         }
@@ -412,13 +127,26 @@ impl Ground {
 
         // Ensure filename has .png extension
         let filename: String = if !filename.ends_with(".png") {
-            format!("{}.png", filename)
+            format!("{filename}.png")
         } else {
             filename.to_string()
         };
 
         if let Err(e) = img.save(&filename) {
-            eprintln!("Failed to save debug image: {}", e);
+            eprintln!("Failed to save debug image: {e}");
         }
     }
 }
+
+pub fn generate_ground_data(args: &Args) -> Ground {
+    if args.terrain {
+        println!("{} Fetching elevation...", "[3/7]".bold());
+        emit_gui_progress_update(15.0, "Fetching elevation...");
+        let ground = Ground::new_enabled(&args.bbox, args.scale, args.ground_level);
+        if args.debug {
+            ground.save_debug_image("elevation_debug");
+        }
+        return ground;
+    }
+    Ground::new_flat(args.ground_level)
+}

src/gui.rs

@@ -0,0 +1,909 @@
+use crate::args::Args;
+use crate::coordinate_system::cartesian::XZPoint;
+use crate::coordinate_system::geographic::{LLBBox, LLPoint};
+use crate::coordinate_system::transformation::CoordTransformer;
+use crate::data_processing;
+use crate::ground::{self, Ground};
+use crate::map_transformation;
+use crate::osm_parser;
+use crate::progress;
+use crate::retrieve_data;
+use crate::telemetry::{self, send_log, LogLevel};
+use crate::version_check;
+use fastnbt::Value;
+use flate2::read::GzDecoder;
+use fs2::FileExt;
+use log::LevelFilter;
+use rfd::FileDialog;
+use std::io::Read;
+use std::path::{Path, PathBuf};
+use std::{env, fs, io::Write};
+use tauri_plugin_log::{Builder as LogBuilder, Target, TargetKind};
+
+/// Manages the session.lock file for a Minecraft world directory
+struct SessionLock {
+    file: fs::File,
+    path: PathBuf,
+}
+
+impl SessionLock {
+    /// Creates and locks a session.lock file in the specified world directory
+    fn acquire(world_path: &Path) -> Result<Self, String> {
+        let session_lock_path = world_path.join("session.lock");
+
+        // Create or open the session.lock file
+        let file = fs::File::create(&session_lock_path)
+            .map_err(|e| format!("Failed to create session.lock file: {e}"))?;
+
+        // Write the snowman character (U+2603) as specified by Minecraft format
+        let snowman_bytes = "☃".as_bytes(); // This is UTF-8 encoded E2 98 83
+        (&file)
+            .write_all(snowman_bytes)
+            .map_err(|e| format!("Failed to write to session.lock file: {e}"))?;
+
+        // Acquire an exclusive lock on the file
+        file.try_lock_exclusive()
+            .map_err(|e| format!("Failed to acquire lock on session.lock file: {e}"))?;
+
+        Ok(SessionLock {
+            file,
+            path: session_lock_path,
+        })
+    }
+}
+
+impl Drop for SessionLock {
+    fn drop(&mut self) {
+        // Release the lock and remove the session.lock file
+        let _ = self.file.unlock();
+        let _ = fs::remove_file(&self.path);
+    }
+}
+
+pub fn run_gui() {
+    // Launch the UI
+    println!("Launching UI...");
+
+    // Install panic hook for crash reporting
+    telemetry::install_panic_hook();
+
+    // Workaround WebKit2GTK issue with NVIDIA drivers and graphics issues
+    // Source: https://github.com/tauri-apps/tauri/issues/10702
+    #[cfg(target_os = "linux")]
+    unsafe {
+        // Disable problematic GPU features that cause map loading issues
+        env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "1");
+        env::set_var("WEBKIT_DISABLE_COMPOSITING_MODE", "1");
+
+        // Force software rendering for better compatibility
+        env::set_var("LIBGL_ALWAYS_SOFTWARE", "1");
+        env::set_var("GALLIUM_DRIVER", "softpipe");
+
+        // Note: Removed sandbox disabling for security reasons
+        // Note: Removed Qt WebEngine flags as they don't apply to Tauri
+    }
+
+    tauri::Builder::default()
+        .plugin(
+            LogBuilder::default()
+                .level(LevelFilter::Warn)
+                .targets([
+                    Target::new(TargetKind::LogDir {
+                        file_name: Some("arnis".into()),
+                    }),
+                    Target::new(TargetKind::Stdout),
+                ])
+                .build(),
+        )
+        .plugin(tauri_plugin_shell::init())
+        .invoke_handler(tauri::generate_handler![
+            gui_select_world,
+            gui_start_generation,
+            gui_get_version,
+            gui_check_for_updates,
+            gui_get_world_map_data
+        ])
+        .setup(|app| {
+            let app_handle = app.handle();
+            let main_window = tauri::Manager::get_webview_window(app_handle, "main")
+                .expect("Failed to get main window");
+            progress::set_main_window(main_window);
+            Ok(())
+        })
+        .run(tauri::generate_context!())
+        .expect("Error while starting the application UI (Tauri)");
+}
+
+#[tauri::command]
+fn gui_select_world(generate_new: bool) -> Result<String, i32> {
+    // Determine the default Minecraft 'saves' directory based on the OS
+    let default_dir: Option<PathBuf> = if cfg!(target_os = "windows") {
+        env::var("APPDATA")
+            .ok()
+            .map(|appdata: String| PathBuf::from(appdata).join(".minecraft").join("saves"))
+    } else if cfg!(target_os = "macos") {
+        dirs::home_dir().map(|home: PathBuf| {
+            home.join("Library/Application Support/minecraft")
+                .join("saves")
+        })
+    } else if cfg!(target_os = "linux") {
+        dirs::home_dir().map(|home| {
+            let flatpak_path = home.join(".var/app/com.mojang.Minecraft/.minecraft/saves");
+            if flatpak_path.exists() {
+                flatpak_path
+            } else {
+                home.join(".minecraft/saves")
+            }
+        })
+    } else {
+        None
+    };
+
+    if generate_new {
+        // Handle new world generation
+        if let Some(default_path) = &default_dir {
+            if default_path.exists() {
+                // Call create_new_world and return the result
+                create_new_world(default_path).map_err(|_| 1) // Error code 1: Minecraft directory not found
+            } else {
+                Err(1) // Error code 1: Minecraft directory not found
+            }
+        } else {
+            Err(1) // Error code 1: Minecraft directory not found
+        }
+    } else {
+        // Handle existing world selection
+        // Open the directory picker dialog
+        let dialog: FileDialog = FileDialog::new();
+        let dialog: FileDialog = if let Some(start_dir) = default_dir.filter(|dir| dir.exists()) {
+            dialog.set_directory(start_dir)
+        } else {
+            dialog
+        };
+
+        if let Some(path) = dialog.pick_folder() {
+            // Check if the "region" folder exists within the selected directory
+            if path.join("region").exists() {
+                // Check the 'session.lock' file
+                let session_lock_path = path.join("session.lock");
+                if session_lock_path.exists() {
+                    // Try to acquire a lock on the session.lock file
+                    if let Ok(file) = fs::File::open(&session_lock_path) {
+                        if fs2::FileExt::try_lock_shared(&file).is_err() {
+                            return Err(2); // Error code 2: The selected world is currently in use
+                        } else {
+                            // Release the lock immediately
+                            let _ = fs2::FileExt::unlock(&file);
+                        }
+                    }
+                }
+
+                return Ok(path.display().to_string());
+            } else {
+                // No Minecraft directory found, generating new world in custom user selected directory
+                return create_new_world(&path).map_err(|_| 3); // Error code 3: Failed to create new world
+            }
+        }
+
+        // If no folder was selected, return an error message
+        Err(4) // Error code 4: No world selected
+    }
+}
+
+fn create_new_world(base_path: &Path) -> Result<String, String> {
+    // Generate a unique world name with proper counter
+    // Check for both "Arnis World X" and "Arnis World X: Location" patterns
+    let mut counter: i32 = 1;
+    let unique_name: String = loop {
+        let candidate_name: String = format!("Arnis World {counter}");
+        let candidate_path: PathBuf = base_path.join(&candidate_name);
+
+        // Check for exact match (no location suffix)
+        let exact_match_exists = candidate_path.exists();
+
+        // Check for worlds with location suffix (Arnis World X: Location)
+        let location_pattern = format!("Arnis World {counter}: ");
+        let location_match_exists = fs::read_dir(base_path)
+            .map(|entries| {
+                entries
+                    .filter_map(Result::ok)
+                    .filter_map(|entry| entry.file_name().into_string().ok())
+                    .any(|name| name.starts_with(&location_pattern))
+            })
+            .unwrap_or(false);
+
+        if !exact_match_exists && !location_match_exists {
+            break candidate_name;
+        }
+        counter += 1;
+    };
+
+    let new_world_path: PathBuf = base_path.join(&unique_name);
+
+    // Create the new world directory structure
+    fs::create_dir_all(new_world_path.join("region"))
+        .map_err(|e| format!("Failed to create world directory: {e}"))?;
+
+    // Copy the region template file
+    const REGION_TEMPLATE: &[u8] = include_bytes!("../assets/minecraft/region.template");
+    let region_path = new_world_path.join("region").join("r.0.0.mca");
+    fs::write(&region_path, REGION_TEMPLATE)
+        .map_err(|e| format!("Failed to create region file: {e}"))?;
+
+    // Add the level.dat file
+    const LEVEL_TEMPLATE: &[u8] = include_bytes!("../assets/minecraft/level.dat");
+
+    // Decompress the gzipped level.template
+    let mut decoder = GzDecoder::new(LEVEL_TEMPLATE);
+    let mut decompressed_data = Vec::new();
+    decoder
+        .read_to_end(&mut decompressed_data)
+        .map_err(|e| format!("Failed to decompress level.template: {e}"))?;
+
+    // Parse the decompressed NBT data
+    let mut level_data: Value = fastnbt::from_bytes(&decompressed_data)
+        .map_err(|e| format!("Failed to parse level.dat template: {e}"))?;
+
+    // Modify the LevelName, LastPlayed and player position fields
+    if let Value::Compound(ref mut root) = level_data {
+        if let Some(Value::Compound(ref mut data)) = root.get_mut("Data") {
+            // Update LevelName
+            data.insert("LevelName".to_string(), Value::String(unique_name.clone()));
+
+            // Update LastPlayed to the current Unix time in milliseconds
+            let current_time = std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .map_err(|e| format!("Failed to get current time: {e}"))?;
+            let current_time_millis = current_time.as_millis() as i64;
+            data.insert("LastPlayed".to_string(), Value::Long(current_time_millis));
+
+            // Update player position and rotation
+            if let Some(Value::Compound(ref mut player)) = data.get_mut("Player") {
+                if let Some(Value::List(ref mut pos)) = player.get_mut("Pos") {
+                    if let Value::Double(ref mut x) = pos.get_mut(0).unwrap() {
+                        *x = -5.0;
+                    }
+                    if let Value::Double(ref mut y) = pos.get_mut(1).unwrap() {
+                        *y = -61.0;
+                    }
+                    if let Value::Double(ref mut z) = pos.get_mut(2).unwrap() {
+                        *z = -5.0;
+                    }
+                }
+
+                if let Some(Value::List(ref mut rot)) = player.get_mut("Rotation") {
+                    if let Value::Float(ref mut x) = rot.get_mut(0).unwrap() {
+                        *x = -45.0;
+                    }
+                }
+            }
+        }
+    }
+
+    // Serialize the updated NBT data back to bytes
+    let serialized_level_data: Vec<u8> = fastnbt::to_bytes(&level_data)
+        .map_err(|e| format!("Failed to serialize updated level.dat: {e}"))?;
+
+    // Compress the serialized data back to gzip
+    let mut encoder = flate2::write::GzEncoder::new(Vec::new(), flate2::Compression::default());
+    encoder
+        .write_all(&serialized_level_data)
+        .map_err(|e| format!("Failed to compress updated level.dat: {e}"))?;
+    let compressed_level_data = encoder
+        .finish()
+        .map_err(|e| format!("Failed to finalize compression for level.dat: {e}"))?;
+
+    // Write the level.dat file
+    fs::write(new_world_path.join("level.dat"), compressed_level_data)
+        .map_err(|e| format!("Failed to create level.dat file: {e}"))?;
+
+    // Add the icon.png file
+    const ICON_TEMPLATE: &[u8] = include_bytes!("../assets/minecraft/icon.png");
+    fs::write(new_world_path.join("icon.png"), ICON_TEMPLATE)
+        .map_err(|e| format!("Failed to create icon.png file: {e}"))?;
+
+    Ok(new_world_path.display().to_string())
+}
+
+/// Adds localized area name to the world name in level.dat
+fn add_localized_world_name(world_path: PathBuf, bbox: &LLBBox) -> PathBuf {
+    // Only proceed if the path exists
+    if !world_path.exists() {
+        return world_path;
+    }
+
+    // Check the level.dat file first to get the current name
+    let level_path = world_path.join("level.dat");
+
+    if !level_path.exists() {
+        return world_path;
+    }
+
+    // Try to read the current world name from level.dat
+    let Ok(level_data) = std::fs::read(&level_path) else {
+        return world_path;
+    };
+
+    let mut decoder = GzDecoder::new(level_data.as_slice());
+    let mut decompressed_data = Vec::new();
+    if decoder.read_to_end(&mut decompressed_data).is_err() {
+        return world_path;
+    }
+
+    let Ok(Value::Compound(ref root)) = fastnbt::from_bytes::<Value>(&decompressed_data) else {
+        return world_path;
+    };
+
+    let Some(Value::Compound(ref data)) = root.get("Data") else {
+        return world_path;
+    };
+
+    let Some(Value::String(current_name)) = data.get("LevelName") else {
+        return world_path;
+    };
+
+    // Only modify if it's an Arnis world and doesn't already have an area name
+    if !current_name.starts_with("Arnis World ") || current_name.contains(": ") {
+        return world_path;
+    }
+
+    // Calculate center coordinates of bbox
+    let center_lat = (bbox.min().lat() + bbox.max().lat()) / 2.0;
+    let center_lon = (bbox.min().lng() + bbox.max().lng()) / 2.0;
+
+    // Try to fetch the area name
+    let area_name = match retrieve_data::fetch_area_name(center_lat, center_lon) {
+        Ok(Some(name)) => name,
+        _ => return world_path, // Keep original name if no area name found
+    };
+
+    // Create new name with localized area name, ensuring total length doesn't exceed 30 characters
+    let base_name = current_name.clone();
+    let max_area_name_len = 30 - base_name.len() - 2; // 2 chars for ": "
+
+    let truncated_area_name =
+        if area_name.chars().count() > max_area_name_len && max_area_name_len > 0 {
+            // Truncate the area name to fit within the 30 character limit
+            area_name
+                .chars()
+                .take(max_area_name_len)
+                .collect::<String>()
+        } else if max_area_name_len == 0 {
+            // If base name is already too long, don't add area name
+            return world_path;
+        } else {
+            area_name
+        };
+
+    let new_name = format!("{base_name}: {truncated_area_name}");
+
+    // Update the level.dat file with the new name
+    if let Ok(level_data) = std::fs::read(&level_path) {
+        let mut decoder = GzDecoder::new(level_data.as_slice());
+        let mut decompressed_data = Vec::new();
+        if decoder.read_to_end(&mut decompressed_data).is_ok() {
+            if let Ok(mut nbt_data) = fastnbt::from_bytes::<Value>(&decompressed_data) {
+                // Update the level name in NBT data
+                if let Value::Compound(ref mut root) = nbt_data {
+                    if let Some(Value::Compound(ref mut data)) = root.get_mut("Data") {
+                        data.insert("LevelName".to_string(), Value::String(new_name));
+
+                        // Save the updated NBT data
+                        if let Ok(serialized_data) = fastnbt::to_bytes(&nbt_data) {
+                            let mut encoder = flate2::write::GzEncoder::new(
+                                Vec::new(),
+                                flate2::Compression::default(),
+                            );
+                            if encoder.write_all(&serialized_data).is_ok() {
+                                if let Ok(compressed_data) = encoder.finish() {
+                                    if let Err(e) = std::fs::write(&level_path, compressed_data) {
+                                        eprintln!("Failed to update level.dat with area name: {e}");
+                                        send_log(
+                                            LogLevel::Warning,
+                                            "Failed to update level.dat with area name",
+                                        );
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    // Return the original path since we didn't change the directory name
+    world_path
+}
+
+// Function to update player position in level.dat based on spawn point coordinates
+fn update_player_position(
+    world_path: &str,
+    spawn_point: Option<(f64, f64)>,
+    bbox_text: String,
+    scale: f64,
+) -> Result<(), String> {
+    use crate::coordinate_system::transformation::CoordTransformer;
+
+    let Some((lat, lng)) = spawn_point else {
+        return Ok(()); // No spawn point selected, exit early
+    };
+
+    // Parse geometrical point and bounding box
+    let llpoint =
+        LLPoint::new(lat, lng).map_err(|e| format!("Failed to parse spawn point:\n{e}"))?;
+    let llbbox = LLBBox::from_str(&bbox_text)
+        .map_err(|e| format!("Failed to parse bounding box for spawn point:\n{e}"))?;
+
+    // Check if spawn point is within the bbox
+    if !llbbox.contains(&llpoint) {
+        return Err("Spawn point is outside the selected area".to_string());
+    }
+
+    // Convert lat/lng to Minecraft coordinates
+    let (transformer, _) = CoordTransformer::llbbox_to_xzbbox(&llbbox, scale)
+        .map_err(|e| format!("Failed to build transformation on coordinate systems:\n{e}"))?;
+
+    let xzpoint = transformer.transform_point(llpoint);
+
+    // Default y spawn position since terrain elevation cannot be determined yet
+    let y = 150.0;
+
+    // Read and update the level.dat file
+    let level_path = PathBuf::from(world_path).join("level.dat");
+    if !level_path.exists() {
+        return Err(format!("Level.dat not found at {level_path:?}"));
+    }
+
+    // Read the level.dat file
+    let level_data = match std::fs::read(&level_path) {
+        Ok(data) => data,
+        Err(e) => return Err(format!("Failed to read level.dat: {e}")),
+    };
+
+    // Decompress and parse the NBT data
+    let mut decoder = GzDecoder::new(level_data.as_slice());
+    let mut decompressed_data = Vec::new();
+    if let Err(e) = decoder.read_to_end(&mut decompressed_data) {
+        return Err(format!("Failed to decompress level.dat: {e}"));
+    }
+
+    let mut nbt_data = match fastnbt::from_bytes::<Value>(&decompressed_data) {
+        Ok(data) => data,
+        Err(e) => return Err(format!("Failed to parse level.dat NBT data: {e}")),
+    };
+
+    // Update player position and world spawn point
+    if let Value::Compound(ref mut root) = nbt_data {
+        if let Some(Value::Compound(ref mut data)) = root.get_mut("Data") {
+            // Set world spawn point
+            data.insert("SpawnX".to_string(), Value::Int(xzpoint.x));
+            data.insert("SpawnY".to_string(), Value::Int(y as i32));
+            data.insert("SpawnZ".to_string(), Value::Int(xzpoint.z));
+
+            // Update player position
+            if let Some(Value::Compound(ref mut player)) = data.get_mut("Player") {
+                if let Some(Value::List(ref mut pos)) = player.get_mut("Pos") {
+                    if let Value::Double(ref mut pos_x) = pos.get_mut(0).unwrap() {
+                        *pos_x = xzpoint.x as f64;
+                    }
+                    if let Value::Double(ref mut pos_y) = pos.get_mut(1).unwrap() {
+                        *pos_y = y;
+                    }
+                    if let Value::Double(ref mut pos_z) = pos.get_mut(2).unwrap() {
+                        *pos_z = xzpoint.z as f64;
+                    }
+                }
+            }
+        }
+    }
+
+    // Serialize and save the updated level.dat
+    let serialized_data = match fastnbt::to_bytes(&nbt_data) {
+        Ok(data) => data,
+        Err(e) => return Err(format!("Failed to serialize updated level.dat: {e}")),
+    };
+
+    let mut encoder = flate2::write::GzEncoder::new(Vec::new(), flate2::Compression::default());
+    if let Err(e) = encoder.write_all(&serialized_data) {
+        return Err(format!("Failed to compress updated level.dat: {e}"));
+    }
+
+    let compressed_data = match encoder.finish() {
+        Ok(data) => data,
+        Err(e) => return Err(format!("Failed to finalize compression for level.dat: {e}")),
+    };
+
+    // Write the updated level.dat file
+    if let Err(e) = std::fs::write(level_path, compressed_data) {
+        return Err(format!("Failed to write updated level.dat: {e}"));
+    }
+
+    Ok(())
+}
+
+// Function to update player spawn Y coordinate based on terrain height after generation
+pub fn update_player_spawn_y_after_generation(
+    world_path: &Path,
+    spawn_point: Option<(f64, f64)>,
+    bbox_text: String,
+    scale: f64,
+    ground: &Ground,
+) -> Result<(), String> {
+    use crate::coordinate_system::transformation::CoordTransformer;
+
+    let Some((_lat, _lng)) = spawn_point else {
+        return Ok(()); // No spawn point selected, exit early
+    };
+
+    // Read the current level.dat file to get existing spawn coordinates
+    let level_path = PathBuf::from(world_path).join("level.dat");
+    if !level_path.exists() {
+        return Err(format!("Level.dat not found at {level_path:?}"));
+    }
+
+    // Read the level.dat file
+    let level_data = match std::fs::read(&level_path) {
+        Ok(data) => data,
+        Err(e) => return Err(format!("Failed to read level.dat: {e}")),
+    };
+
+    // Decompress and parse the NBT data
+    let mut decoder = GzDecoder::new(level_data.as_slice());
+    let mut decompressed_data = Vec::new();
+    if let Err(e) = decoder.read_to_end(&mut decompressed_data) {
+        return Err(format!("Failed to decompress level.dat: {e}"));
+    }
+
+    let mut nbt_data = match fastnbt::from_bytes::<Value>(&decompressed_data) {
+        Ok(data) => data,
+        Err(e) => return Err(format!("Failed to parse level.dat NBT data: {e}")),
+    };
+
+    // Get existing spawn coordinates and calculate new Y based on terrain
+    let (existing_spawn_x, existing_spawn_z) = if let Value::Compound(ref root) = nbt_data {
+        if let Some(Value::Compound(ref data)) = root.get("Data") {
+            let spawn_x = data.get("SpawnX").and_then(|v| {
+                if let Value::Int(x) = v {
+                    Some(*x)
+                } else {
+                    None
+                }
+            });
+            let spawn_z = data.get("SpawnZ").and_then(|v| {
+                if let Value::Int(z) = v {
+                    Some(*z)
+                } else {
+                    None
+                }
+            });
+
+            match (spawn_x, spawn_z) {
+                (Some(x), Some(z)) => (x, z),
+                _ => {
+                    return Err("Spawn coordinates not found in level.dat".to_string());
+                }
+            }
+        } else {
+            return Err("Invalid level.dat structure: no Data compound".to_string());
+        }
+    } else {
+        return Err("Invalid level.dat structure: root is not a compound".to_string());
+    };
+
+    // Calculate terrain-based Y coordinate
+    let spawn_y = if ground.elevation_enabled {
+        // Parse coordinates for terrain lookup
+        let llbbox = LLBBox::from_str(&bbox_text)
+            .map_err(|e| format!("Failed to parse bounding box for spawn point:\n{e}"))?;
+        let (_, xzbbox) = CoordTransformer::llbbox_to_xzbbox(&llbbox, scale)
+            .map_err(|e| format!("Failed to build transformation:\n{e}"))?;
+
+        // Calculate relative coordinates for ground system
+        let relative_x = existing_spawn_x - xzbbox.min_x();
+        let relative_z = existing_spawn_z - xzbbox.min_z();
+        let terrain_point = XZPoint::new(relative_x, relative_z);
+
+        ground.level(terrain_point) + 2
+    } else {
+        -61 // Default Y if no terrain
+    };
+
+    // Update player position and world spawn point
+    if let Value::Compound(ref mut root) = nbt_data {
+        if let Some(Value::Compound(ref mut data)) = root.get_mut("Data") {
+            // Only update the Y coordinate, keep existing X and Z
+            data.insert("SpawnY".to_string(), Value::Int(spawn_y));
+
+            // Update player position - only Y coordinate
+            if let Some(Value::Compound(ref mut player)) = data.get_mut("Player") {
+                if let Some(Value::List(ref mut pos)) = player.get_mut("Pos") {
+                    // Keep existing X and Z, only update Y
+                    if let Value::Double(ref mut pos_y) = pos.get_mut(1).unwrap() {
+                        *pos_y = spawn_y as f64;
+                    }
+                }
+            }
+        }
+    }
+
+    // Serialize and save the updated level.dat
+    let serialized_data = match fastnbt::to_bytes(&nbt_data) {
+        Ok(data) => data,
+        Err(e) => return Err(format!("Failed to serialize updated level.dat: {e}")),
+    };
+
+    let mut encoder = flate2::write::GzEncoder::new(Vec::new(), flate2::Compression::default());
+    if let Err(e) = encoder.write_all(&serialized_data) {
+        return Err(format!("Failed to compress updated level.dat: {e}"));
+    }
+
+    let compressed_data = match encoder.finish() {
+        Ok(data) => data,
+        Err(e) => return Err(format!("Failed to finalize compression for level.dat: {e}")),
+    };
+
+    // Write the updated level.dat file
+    if let Err(e) = std::fs::write(level_path, compressed_data) {
+        return Err(format!("Failed to write updated level.dat: {e}"));
+    }
+
+    Ok(())
+}
+
+#[tauri::command]
+fn gui_get_version() -> String {
+    env!("CARGO_PKG_VERSION").to_string()
+}
+
+#[tauri::command]
+fn gui_check_for_updates() -> Result<bool, String> {
+    match version_check::check_for_updates() {
+        Ok(is_newer) => Ok(is_newer),
+        Err(e) => Err(format!("Error checking for updates: {e}")),
+    }
+}
+
+/// Returns the world map image data as base64 and geo bounds for overlay display.
+/// Returns None if the map image or metadata doesn't exist.
+#[tauri::command]
+fn gui_get_world_map_data(world_path: String) -> Result<Option<WorldMapData>, String> {
+    let world_dir = PathBuf::from(&world_path);
+    let map_path = world_dir.join("arnis_world_map.png");
+    let metadata_path = world_dir.join("metadata.json");
+
+    // Check if both files exist
+    if !map_path.exists() || !metadata_path.exists() {
+        return Ok(None);
+    }
+
+    // Read and encode the map image as base64
+    let image_data = fs::read(&map_path).map_err(|e| format!("Failed to read map image: {e}"))?;
+    let base64_image =
+        base64::Engine::encode(&base64::engine::general_purpose::STANDARD, &image_data);
+
+    // Read metadata
+    let metadata_content =
+        fs::read_to_string(&metadata_path).map_err(|e| format!("Failed to read metadata: {e}"))?;
+    let metadata: serde_json::Value = serde_json::from_str(&metadata_content)
+        .map_err(|e| format!("Failed to parse metadata: {e}"))?;
+
+    // Extract geo bounds (metadata uses camelCase from serde)
+    let min_lat = metadata["minGeoLat"]
+        .as_f64()
+        .ok_or("Missing minGeoLat in metadata")?;
+    let max_lat = metadata["maxGeoLat"]
+        .as_f64()
+        .ok_or("Missing maxGeoLat in metadata")?;
+    let min_lon = metadata["minGeoLon"]
+        .as_f64()
+        .ok_or("Missing minGeoLon in metadata")?;
+    let max_lon = metadata["maxGeoLon"]
+        .as_f64()
+        .ok_or("Missing maxGeoLon in metadata")?;
+
+    Ok(Some(WorldMapData {
+        image_base64: format!("data:image/png;base64,{}", base64_image),
+        min_lat,
+        max_lat,
+        min_lon,
+        max_lon,
+    }))
+}
+
+/// Data structure for world map overlay
+#[derive(serde::Serialize)]
+struct WorldMapData {
+    image_base64: String,
+    min_lat: f64,
+    max_lat: f64,
+    min_lon: f64,
+    max_lon: f64,
+}
+
+#[tauri::command]
+#[allow(clippy::too_many_arguments)]
+#[allow(unused_variables)]
+fn gui_start_generation(
+    bbox_text: String,
+    selected_world: String,
+    world_scale: f64,
+    ground_level: i32,
+    floodfill_timeout: u64,
+    terrain_enabled: bool,
+    skip_osm_objects: bool,
+    interior_enabled: bool,
+    roof_enabled: bool,
+    fillground_enabled: bool,
+    is_new_world: bool,
+    spawn_point: Option<(f64, f64)>,
+    telemetry_consent: bool,
+) -> Result<(), String> {
+    use progress::emit_gui_error;
+    use LLBBox;
+
+    // Store telemetry consent for crash reporting
+    telemetry::set_telemetry_consent(telemetry_consent);
+
+    // Send generation click telemetry
+    telemetry::send_generation_click();
+
+    // If spawn point was chosen and the world is new, check and set the spawn point
+    if is_new_world && spawn_point.is_some() {
+        // Verify the spawn point is within bounds
+        if let Some(coords) = spawn_point {
+            let llbbox = match LLBBox::from_str(&bbox_text) {
+                Ok(bbox) => bbox,
+                Err(e) => {
+                    let error_msg = format!("Failed to parse bounding box: {e}");
+                    eprintln!("{error_msg}");
+                    emit_gui_error(&error_msg);
+                    return Err(error_msg);
+                }
+            };
+
+            let llpoint = LLPoint::new(coords.0, coords.1)
+                .map_err(|e| format!("Failed to parse spawn point: {e}"))?;
+
+            if llbbox.contains(&llpoint) {
+                // Spawn point is valid, update the player position
+                update_player_position(
+                    &selected_world,
+                    spawn_point,
+                    bbox_text.clone(),
+                    world_scale,
+                )
+                .map_err(|e| format!("Failed to set spawn point: {e}"))?;
+            }
+        }
+    }
+
+    tauri::async_runtime::spawn(async move {
+        if let Err(e) = tokio::task::spawn_blocking(move || {
+            // Acquire session lock for the world directory before starting generation
+            let world_path = PathBuf::from(&selected_world);
+            let _session_lock = match SessionLock::acquire(&world_path) {
+                Ok(lock) => lock,
+                Err(e) => {
+                    let error_msg = format!("Failed to acquire session lock: {e}");
+                    eprintln!("{error_msg}");
+                    emit_gui_error(&error_msg);
+                    return Err(error_msg);
+                }
+            };
+
+            // Parse the bounding box from the text with proper error handling
+            let bbox = match LLBBox::from_str(&bbox_text) {
+                Ok(bbox) => bbox,
+                Err(e) => {
+                    let error_msg = format!("Failed to parse bounding box: {e}");
+                    eprintln!("{error_msg}");
+                    emit_gui_error(&error_msg);
+                    return Err(error_msg);
+                }
+            };
+
+            // Add localized name to the world if user generated a new world
+            let updated_world_path = if is_new_world {
+                add_localized_world_name(world_path, &bbox)
+            } else {
+                world_path
+            };
+
+            // Create an Args instance with the chosen bounding box and world directory path
+            let args: Args = Args {
+                bbox,
+                file: None,
+                save_json_file: None,
+                path: updated_world_path,
+                downloader: "requests".to_string(),
+                scale: world_scale,
+                ground_level,
+                terrain: terrain_enabled,
+                interior: interior_enabled,
+                roof: roof_enabled,
+                fillground: fillground_enabled,
+                debug: false,
+                timeout: Some(std::time::Duration::from_secs(floodfill_timeout)),
+                generate_map: true,
+                spawn_point,
+            };
+
+            // If skip_osm_objects is true (terrain-only mode), skip fetching and processing OSM data
+            if skip_osm_objects {
+                // Generate ground data (terrain) for terrain-only mode
+                let ground = ground::generate_ground_data(&args);
+
+                // Create empty parsed_elements and xzbbox for terrain-only mode
+                let parsed_elements = Vec::new();
+                let (_coord_transformer, xzbbox) =
+                    CoordTransformer::llbbox_to_xzbbox(&args.bbox, args.scale)
+                        .map_err(|e| format!("Failed to create coordinate transformer: {}", e))?;
+
+                let _ = data_processing::generate_world(
+                    parsed_elements,
+                    xzbbox,
+                    args.bbox,
+                    ground,
+                    &args,
+                );
+                // Session lock will be automatically released when _session_lock goes out of scope
+                return Ok(());
+            }
+
+            // Run data fetch and world generation (standard mode: objects + terrain, or objects only)
+            match retrieve_data::fetch_data_from_overpass(args.bbox, args.debug, "requests", None) {
+                Ok(raw_data) => {
+                    let (mut parsed_elements, mut xzbbox) =
+                        osm_parser::parse_osm_data(raw_data, args.bbox, args.scale, args.debug);
+                    parsed_elements.sort_by(|el1, el2| {
+                        let (el1_priority, el2_priority) =
+                            (osm_parser::get_priority(el1), osm_parser::get_priority(el2));
+                        match (
+                            el1.tags().contains_key("landuse"),
+                            el2.tags().contains_key("landuse"),
+                        ) {
+                            (true, false) => std::cmp::Ordering::Greater,
+                            (false, true) => std::cmp::Ordering::Less,
+                            _ => el1_priority.cmp(&el2_priority),
+                        }
+                    });
+
+                    let mut ground = ground::generate_ground_data(&args);
+
+                    // Transform map (parsed_elements). Operations are defined in a json file
+                    map_transformation::transform_map(
+                        &mut parsed_elements,
+                        &mut xzbbox,
+                        &mut ground,
+                    );
+
+                    let _ = data_processing::generate_world(
+                        parsed_elements,
+                        xzbbox,
+                        args.bbox,
+                        ground,
+                        &args,
+                    );
+                    // Session lock will be automatically released when _session_lock goes out of scope
+                    Ok(())
+                }
+                Err(e) => {
+                    let error_msg = format!("Failed to fetch data: {e}");
+                    emit_gui_error(&error_msg);
+                    // Session lock will be automatically released when _session_lock goes out of scope
+                    Err(error_msg)
+                }
+            }
+        })
+        .await
+        {
+            let error_msg = format!("Error in blocking task: {e}");
+            eprintln!("{error_msg}");
+            emit_gui_error(&error_msg);
+            // Session lock will be automatically released when the task fails
+        }
+    });
+
+    Ok(())
+}

src/gui/arnis.desktop

@@ -0,0 +1,15 @@
+[Desktop Entry]
+Type=Application
+Name=Arnis
+Comment=Generate cities from real life in Minecraft
+Comment[lt]=Sugeneruokite tikrovės miestus „Minecraft“ žaidime
+Comment[de]=Generiere echte Städte in Minecraft
+Comment[fr]=Générez des villes réelles dans Minecraft
+Comment[es]=Genera ciudades reales en Minecraft
+Comment[pt]=Gere cidades reais no Minecraft
+Comment[zh_CN]=在 Minecraft 中生成现实城市
+Icon=icon
+Exec=arnis
+Categories=Game;Education;Geoscience
+Keywords=OSM;OpenStreetMap;Minecraft
+StartupWMClass=arnis

src/gui/css/bbox.css

@@ -344,4 +344,38 @@ body,
   filter: blur(1px) sepia(1) invert(1);
   transition: all 1s ease;
 
+}
+
+/* World Preview Button in Edit Toolbar */
+.leaflet-draw-toolbar .leaflet-draw-edit-preview {
+  background-position: -31px -2px;
+}
+
+.leaflet-draw-toolbar .leaflet-draw-edit-preview.disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+  pointer-events: none;
+}
+
+.leaflet-draw-toolbar .leaflet-draw-edit-preview.active {
+  background-color: #a0d0ff;
+}
+
+.world-preview-slider-container {
+  padding: 6px 8px !important;
+  background: white !important;
+  background-clip: padding-box;
+}
+
+.world-preview-slider-container a {
+  display: none !important;
+}
+
+.world-preview-slider {
+  width: 80px;
+  height: 8px;
+  cursor: pointer;
+  accent-color: #3887BE;
+  display: block;
+  margin: 0;
 }