Merge pull request #714 from louis-e/revert-sequential-streaming

Revert sequential streaming saving since generation speed was affected

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
             target: x86_64-unknown-linux-gnu
             binary_name: arnis
             asset_name: arnis-linux
-          - os: macos-13  # Intel runner for x86_64 builds
+          - os: macos-15-intel  # Intel runner for x86_64 builds
             target: x86_64-apple-darwin
             binary_name: arnis
             asset_name: arnis-mac-intel
@@ -99,7 +99,7 @@ jobs:
     - name: Download macOS Intel build
       uses: actions/download-artifact@v7
       with:
-        name: macos-13-x86_64-apple-darwin-build
+        name: macos-15-intel-x86_64-apple-darwin-build
         path: ./intel
 
     - name: Download macOS ARM64 build
@@ -157,4 +157,4 @@ jobs:
           builds/linux/arnis-linux
           builds/macos/arnis-mac-universal
       env:
-        GITHUB_TOKEN: ${{ secrets.RELEASE_TOKEN }}
+        GITHUB_TOKEN: ${{ secrets.RELEASE_TOKEN }}

Cargo.lock

@@ -182,7 +182,7 @@ dependencies = [
 
 [[package]]
 name = "arnis"
-version = "2.4.0"
+version = "2.4.1"
 dependencies = [
  "base64 0.22.1",
  "bedrockrs_level",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "arnis"
-version = "2.4.0"
+version = "2.4.1"
 edition = "2021"
 description = "Arnis - Generate real life cities in Minecraft"
 homepage = "https://github.com/louis-e/arnis"

README.md

@@ -63,6 +63,8 @@ Arnis has been recognized in various academic and press publications after gaini
 
 [XDA Developers: Hometown Minecraft Map: Arnis](https://www.xda-developers.com/hometown-minecraft-map-arnis/)
 
+Free to use assets, including screenshots and logos, can be found [here](https://drive.google.com/file/d/1T1IsZSyT8oa6qAO_40hVF5KR8eEVCJjo/view?usp=sharing).
+
 ## :copyright: License Information
 Copyright (c) 2022-2025 Louis Erbkamm (louis-e)
 

src/args.rs

@@ -58,10 +58,6 @@ pub struct Args {
     /// Set floodfill timeout (seconds) (optional)
     #[arg(long, value_parser = parse_duration)]
     pub timeout: Option<Duration>,
-
-    /// Spawn point coordinates (lat, lng)
-    #[arg(skip)]
-    pub spawn_point: Option<(f64, f64)>,
 }
 
 fn validate_minecraft_world_path(path: &str) -> Result<PathBuf, String> {

src/block_definitions.rs

@@ -266,6 +266,7 @@ impl Block {
             185 => "quartz_stairs",
             186 => "polished_andesite_stairs",
             187 => "nether_brick_stairs",
+            188 => "fern",
             _ => panic!("Invalid id"),
         }
     }
@@ -697,6 +698,7 @@ 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);
+pub const FERN: Block = Block::new(188);
 
 /// Maps a block to its corresponding stair variant
 #[inline]

src/data_processing.rs

@@ -80,7 +80,10 @@ pub fn generate_world_with_options(
 
     // Pre-compute all flood fills in parallel for better CPU utilization
     let mut flood_fill_cache = FloodFillCache::precompute(&elements, args.timeout.as_ref());
-    println!("Pre-computed {} flood fills", flood_fill_cache.way_count());
+
+    // Collect building footprints to prevent trees from spawning inside buildings
+    // Uses a memory-efficient bitmap (~1 bit per coordinate) instead of a HashSet (~24 bytes per coordinate)
+    let building_footprints = flood_fill_cache.collect_building_footprints(&elements, &xzbbox);
 
     // Process data
     let elements_count: usize = elements.len();
@@ -127,13 +130,31 @@ pub fn generate_world_with_options(
                         &flood_fill_cache,
                     );
                 } else if way.tags.contains_key("landuse") {
-                    landuse::generate_landuse(&mut editor, way, args, &flood_fill_cache);
+                    landuse::generate_landuse(
+                        &mut editor,
+                        way,
+                        args,
+                        &flood_fill_cache,
+                        &building_footprints,
+                    );
                 } else if way.tags.contains_key("natural") {
-                    natural::generate_natural(&mut editor, &element, args, &flood_fill_cache);
+                    natural::generate_natural(
+                        &mut editor,
+                        &element,
+                        args,
+                        &flood_fill_cache,
+                        &building_footprints,
+                    );
                 } else if way.tags.contains_key("amenity") {
                     amenities::generate_amenities(&mut editor, &element, args, &flood_fill_cache);
                 } else if way.tags.contains_key("leisure") {
-                    leisure::generate_leisure(&mut editor, way, args, &flood_fill_cache);
+                    leisure::generate_leisure(
+                        &mut editor,
+                        way,
+                        args,
+                        &flood_fill_cache,
+                        &building_footprints,
+                    );
                 } else if way.tags.contains_key("barrier") {
                     barriers::generate_barriers(&mut editor, &element);
                 } else if let Some(val) = way.tags.get("waterway") {
@@ -166,7 +187,13 @@ pub fn generate_world_with_options(
                 } else if node.tags.contains_key("natural")
                     && node.tags.get("natural") == Some(&"tree".to_string())
                 {
-                    natural::generate_natural(&mut editor, &element, args, &flood_fill_cache);
+                    natural::generate_natural(
+                        &mut editor,
+                        &element,
+                        args,
+                        &flood_fill_cache,
+                        &building_footprints,
+                    );
                 } else if node.tags.contains_key("amenity") {
                     amenities::generate_amenities(&mut editor, &element, args, &flood_fill_cache);
                 } else if node.tags.contains_key("barrier") {
@@ -207,6 +234,7 @@ pub fn generate_world_with_options(
                         rel,
                         args,
                         &flood_fill_cache,
+                        &building_footprints,
                     );
                 } else if rel.tags.contains_key("landuse") {
                     landuse::generate_landuse_from_relation(
@@ -214,6 +242,7 @@ pub fn generate_world_with_options(
                         rel,
                         args,
                         &flood_fill_cache,
+                        &building_footprints,
                     );
                 } else if rel.tags.get("leisure") == Some(&"park".to_string()) {
                     leisure::generate_leisure_from_relation(
@@ -221,6 +250,7 @@ pub fn generate_world_with_options(
                         rel,
                         args,
                         &flood_fill_cache,
+                        &building_footprints,
                     );
                 } else if rel.tags.contains_key("man_made") {
                     man_made::generate_man_made(&mut editor, &element, args);
@@ -355,30 +385,28 @@ pub fn generate_world_with_options(
     // Update player spawn Y coordinate based on terrain height after generation
     #[cfg(feature = "gui")]
     if world_format == WorldFormat::JavaAnvil {
-        if let Some(spawn_coords) = &args.spawn_point {
-            use crate::gui::update_player_spawn_y_after_generation;
-            // Reconstruct bbox string to match the format that GUI originally provided.
-            // This ensures LLBBox::from_str() can parse it correctly.
-            let bbox_string = format!(
-                "{},{},{},{}",
-                args.bbox.min().lat(),
-                args.bbox.min().lng(),
-                args.bbox.max().lat(),
-                args.bbox.max().lng()
-            );
+        use crate::gui::update_player_spawn_y_after_generation;
+        // Reconstruct bbox string to match the format that GUI originally provided.
+        // This ensures LLBBox::from_str() can parse it correctly.
+        let bbox_string = format!(
+            "{},{},{},{}",
+            args.bbox.min().lat(),
+            args.bbox.min().lng(),
+            args.bbox.max().lat(),
+            args.bbox.max().lng()
+        );
 
-            if let Err(e) = update_player_spawn_y_after_generation(
-                &args.path,
-                Some(*spawn_coords),
-                bbox_string,
-                args.scale,
-                ground.as_ref(),
-            ) {
-                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);
-            }
+        // Always update spawn Y since we now always set a spawn point (user-selected or default)
+        if let Err(e) = update_player_spawn_y_after_generation(
+            &args.path,
+            bbox_string,
+            args.scale,
+            ground.as_ref(),
+        ) {
+            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);
         }
     }
 

src/element_processing/landuse.rs

@@ -2,7 +2,7 @@ use crate::args::Args;
 use crate::block_definitions::*;
 use crate::deterministic_rng::element_rng;
 use crate::element_processing::tree::Tree;
-use crate::floodfill_cache::FloodFillCache;
+use crate::floodfill_cache::{BuildingFootprintBitmap, FloodFillCache};
 use crate::osm_parser::{ProcessedMemberRole, ProcessedRelation, ProcessedWay};
 use crate::world_editor::WorldEditor;
 use rand::Rng;
@@ -12,6 +12,7 @@ pub fn generate_landuse(
     element: &ProcessedWay,
     args: &Args,
     flood_fill_cache: &FloodFillCache,
+    building_footprints: &BuildingFootprintBitmap,
 ) {
     // Determine block type based on landuse tag
     let binding: String = "".to_string();
@@ -37,7 +38,7 @@ pub fn generate_landuse(
         "commercial" => SMOOTH_STONE, // Placeholder, will be randomized per-block
         "education" => POLISHED_ANDESITE,
         "religious" => POLISHED_ANDESITE,
-        "industrial" => COBBLESTONE,
+        "industrial" => STONE, // Placeholder, will be randomized per-block
         "military" => GRAY_CONCRETE,
         "railway" => GRAVEL,
         "landfill" => {
@@ -83,6 +84,16 @@ pub fn generate_landuse(
             } else {
                 COBBLESTONE
             }
+        } else if landuse_tag == "industrial" {
+            // Industrial: primarily stone, with some stone bricks and smooth stone
+            let random_value = rng.gen_range(0..100);
+            if random_value < 70 {
+                STONE
+            } else if random_value < 90 {
+                STONE_BRICKS
+            } else {
+                SMOOTH_STONE
+            }
         } else {
             block_type
         };
@@ -120,7 +131,7 @@ pub fn generate_landuse(
                             editor.set_block(RED_FLOWER, x, 1, z, None, None);
                         }
                     } else if random_choice < 33 {
-                        Tree::create(editor, (x, 1, z));
+                        Tree::create(editor, (x, 1, z), Some(building_footprints));
                     } else if random_choice < 35 {
                         editor.set_block(OAK_LEAVES, x, 1, z, None, None);
                     }
@@ -130,7 +141,7 @@ pub fn generate_landuse(
                 if editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
                     let random_choice: i32 = rng.gen_range(0..30);
                     if random_choice == 20 {
-                        Tree::create(editor, (x, 1, z));
+                        Tree::create(editor, (x, 1, z), Some(building_footprints));
                     } else if random_choice == 2 {
                         let flower_block: Block = match rng.gen_range(1..=5) {
                             1 => OAK_LEAVES,
@@ -141,7 +152,11 @@ pub fn generate_landuse(
                         };
                         editor.set_block(flower_block, x, 1, z, None, None);
                     } else if random_choice <= 12 {
-                        editor.set_block(GRASS, x, 1, z, None, None);
+                        if rng.gen_range(0..100) < 12 {
+                            editor.set_block(FERN, x, 1, z, None, None);
+                        } else {
+                            editor.set_block(GRASS, x, 1, z, None, None);
+                        }
                     }
                 }
             }
@@ -243,7 +258,8 @@ pub fn generate_landuse(
                 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),
+                        1..=8 => editor.set_block(FERN, x, 1, z, None, None),
+                        9..=170 => editor.set_block(GRASS, x, 1, z, None, None),
                         _ => {}
                     }
                 }
@@ -252,7 +268,8 @@ pub fn generate_landuse(
                 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),
+                        1..=2 => editor.set_block(FERN, x, 1, z, None, None),
+                        3..=17 => editor.set_block(GRASS, x, 1, z, None, None),
                         _ => {}
                     }
                 }
@@ -261,11 +278,13 @@ pub fn generate_landuse(
                 if editor.check_for_block(x, 0, z, Some(&[GRASS_BLOCK])) {
                     let random_choice: i32 = rng.gen_range(0..1001);
                     if random_choice < 5 {
-                        Tree::create(editor, (x, 1, z));
+                        Tree::create(editor, (x, 1, z), Some(building_footprints));
                     } 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 < 40 {
+                        editor.set_block(FERN, x, 1, z, None, None);
                     } else if random_choice < 800 {
                         editor.set_block(GRASS, x, 1, z, None, None);
                     }
@@ -273,11 +292,12 @@ pub fn generate_landuse(
             }
             "orchard" => {
                 if x % 18 == 0 && z % 10 == 0 {
-                    Tree::create(editor, (x, 1, z));
+                    Tree::create(editor, (x, 1, z), Some(building_footprints));
                 } 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),
+                        1..=2 => editor.set_block(FERN, x, 1, z, None, None),
+                        3..=20 => editor.set_block(GRASS, x, 1, z, None, None),
                         _ => {}
                     }
                 }
@@ -312,12 +332,19 @@ pub fn generate_landuse_from_relation(
     rel: &ProcessedRelation,
     args: &Args,
     flood_fill_cache: &FloodFillCache,
+    building_footprints: &BuildingFootprintBitmap,
 ) {
     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, flood_fill_cache);
+                generate_landuse(
+                    editor,
+                    &member.way.clone(),
+                    args,
+                    flood_fill_cache,
+                    building_footprints,
+                );
             }
         }
 
@@ -339,7 +366,13 @@ pub fn generate_landuse_from_relation(
             };
 
             // Generate landuse area from combined way
-            generate_landuse(editor, &combined_way, args, flood_fill_cache);
+            generate_landuse(
+                editor,
+                &combined_way,
+                args,
+                flood_fill_cache,
+                building_footprints,
+            );
         }
     }
 }

src/element_processing/leisure.rs

@@ -3,7 +3,7 @@ use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
 use crate::deterministic_rng::element_rng;
 use crate::element_processing::tree::Tree;
-use crate::floodfill_cache::FloodFillCache;
+use crate::floodfill_cache::{BuildingFootprintBitmap, FloodFillCache};
 use crate::osm_parser::{ProcessedMemberRole, ProcessedRelation, ProcessedWay};
 use crate::world_editor::WorldEditor;
 use rand::Rng;
@@ -13,6 +13,7 @@ pub fn generate_leisure(
     element: &ProcessedWay,
     args: &Args,
     flood_fill_cache: &FloodFillCache,
+    building_footprints: &BuildingFootprintBitmap,
 ) {
     if let Some(leisure_type) = element.tags.get("leisure") {
         let mut previous_node: Option<(i32, i32)> = None;
@@ -118,7 +119,7 @@ pub fn generate_leisure(
                         }
                         105..120 => {
                             // Tree
-                            Tree::create(editor, (x, 1, z));
+                            Tree::create(editor, (x, 1, z), Some(building_footprints));
                         }
                         _ => {}
                     }
@@ -179,12 +180,19 @@ pub fn generate_leisure_from_relation(
     rel: &ProcessedRelation,
     args: &Args,
     flood_fill_cache: &FloodFillCache,
+    building_footprints: &BuildingFootprintBitmap,
 ) {
     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, args, flood_fill_cache);
+                generate_leisure(
+                    editor,
+                    &member.way,
+                    args,
+                    flood_fill_cache,
+                    building_footprints,
+                );
             }
         }
 
@@ -204,6 +212,12 @@ pub fn generate_leisure_from_relation(
         };
 
         // Generate leisure area from combined way
-        generate_leisure(editor, &combined_way, args, flood_fill_cache);
+        generate_leisure(
+            editor,
+            &combined_way,
+            args,
+            flood_fill_cache,
+            building_footprints,
+        );
     }
 }

src/element_processing/natural.rs

@@ -3,7 +3,7 @@ use crate::block_definitions::*;
 use crate::bresenham::bresenham_line;
 use crate::deterministic_rng::element_rng;
 use crate::element_processing::tree::Tree;
-use crate::floodfill_cache::FloodFillCache;
+use crate::floodfill_cache::{BuildingFootprintBitmap, FloodFillCache};
 use crate::osm_parser::{ProcessedElement, ProcessedMemberRole, ProcessedRelation, ProcessedWay};
 use crate::world_editor::WorldEditor;
 use rand::Rng;
@@ -13,6 +13,7 @@ pub fn generate_natural(
     element: &ProcessedElement,
     args: &Args,
     flood_fill_cache: &FloodFillCache,
+    building_footprints: &BuildingFootprintBitmap,
 ) {
     if let Some(natural_type) = element.tags().get("natural") {
         if natural_type == "tree" {
@@ -20,7 +21,7 @@ pub fn generate_natural(
                 let x: i32 = node.x;
                 let z: i32 = node.z;
 
-                Tree::create(editor, (x, 1, z));
+                Tree::create(editor, (x, 1, z), Some(building_footprints));
             }
         } else {
             let mut previous_node: Option<(i32, i32)> = None;
@@ -134,7 +135,7 @@ pub fn generate_natural(
                             }
                             let random_choice = rng.gen_range(0..500);
                             if random_choice == 0 {
-                                Tree::create(editor, (x, 1, z));
+                                Tree::create(editor, (x, 1, z), Some(building_footprints));
                             } else if random_choice == 1 {
                                 let flower_block = match rng.gen_range(1..=4) {
                                     1 => RED_FLOWER,
@@ -163,7 +164,7 @@ pub fn generate_natural(
                             }
                             let random_choice: i32 = rng.gen_range(0..30);
                             if random_choice == 0 {
-                                Tree::create(editor, (x, 1, z));
+                                Tree::create(editor, (x, 1, z), Some(building_footprints));
                             } else if random_choice == 1 {
                                 let flower_block = match rng.gen_range(1..=4) {
                                     1 => RED_FLOWER,
@@ -222,7 +223,11 @@ pub fn generate_natural(
                                         // TODO implement mangrove
                                         let random_choice: i32 = rng.gen_range(0..40);
                                         if random_choice == 0 {
-                                            Tree::create(editor, (x, 1, z));
+                                            Tree::create(
+                                                editor,
+                                                (x, 1, z),
+                                                Some(building_footprints),
+                                            );
                                         } else if random_choice < 35 {
                                             editor.set_block(GRASS, x, 1, z, None, None);
                                         }
@@ -306,6 +311,7 @@ pub fn generate_natural(
                                                         Tree::create(
                                                             editor,
                                                             (cluster_x, 1, cluster_z),
+                                                            Some(building_footprints),
                                                         );
                                                     } else if vegetation_chance < 15 {
                                                         // 15% chance for grass
@@ -418,7 +424,7 @@ pub fn generate_natural(
                             let hill_chance = rng.gen_range(0..1000);
                             if hill_chance == 0 {
                                 // 0.1% chance for rare trees
-                                Tree::create(editor, (x, 1, z));
+                                Tree::create(editor, (x, 1, z), Some(building_footprints));
                             } else if hill_chance < 50 {
                                 // 5% chance for flowers
                                 let flower_block = match rng.gen_range(1..=4) {
@@ -451,6 +457,7 @@ pub fn generate_natural_from_relation(
     rel: &ProcessedRelation,
     args: &Args,
     flood_fill_cache: &FloodFillCache,
+    building_footprints: &BuildingFootprintBitmap,
 ) {
     if rel.tags.contains_key("natural") {
         // Generate individual ways with their original tags
@@ -461,6 +468,7 @@ pub fn generate_natural_from_relation(
                     &ProcessedElement::Way((*member.way).clone()),
                     args,
                     flood_fill_cache,
+                    building_footprints,
                 );
             }
         }
@@ -488,6 +496,7 @@ pub fn generate_natural_from_relation(
                 &ProcessedElement::Way(combined_way),
                 args,
                 flood_fill_cache,
+                building_footprints,
             );
         }
     }

src/element_processing/tree.rs

@@ -1,5 +1,6 @@
 use crate::block_definitions::*;
 use crate::deterministic_rng::coord_rng;
+use crate::floodfill_cache::BuildingFootprintBitmap;
 use crate::world_editor::WorldEditor;
 use rand::Rng;
 
@@ -108,7 +109,25 @@ pub struct Tree<'a> {
 }
 
 impl Tree<'_> {
-    pub fn create(editor: &mut WorldEditor, (x, y, z): Coord) {
+    /// Creates a tree at the specified coordinates.
+    ///
+    /// # Arguments
+    /// * `editor` - The world editor to place blocks
+    /// * `(x, y, z)` - The base coordinates for the tree
+    /// * `building_footprints` - Optional bitmap of (x, z) coordinates that are inside buildings.
+    ///   If provided, trees will not be placed at coordinates within this bitmap.
+    pub fn create(
+        editor: &mut WorldEditor,
+        (x, y, z): Coord,
+        building_footprints: Option<&BuildingFootprintBitmap>,
+    ) {
+        // Skip if this coordinate is inside a building
+        if let Some(footprints) = building_footprints {
+            if footprints.contains(x, z) {
+                return;
+            }
+        }
+
         let mut blacklist: Vec<Block> = Vec::new();
         blacklist.extend(Self::get_building_wall_blocks());
         blacklist.extend(Self::get_building_floor_blocks());

src/floodfill_cache.rs

@@ -4,12 +4,119 @@
 //! before the main element processing loop, then retrieve cached results during
 //! sequential processing.
 
+use crate::coordinate_system::cartesian::XZBBox;
 use crate::floodfill::flood_fill_area;
-use crate::osm_parser::{ProcessedElement, ProcessedWay};
+use crate::osm_parser::{ProcessedElement, ProcessedMemberRole, ProcessedWay};
 use fnv::FnvHashMap;
 use rayon::prelude::*;
 use std::time::Duration;
 
+/// A memory-efficient bitmap for storing building footprint coordinates.
+///
+/// Instead of storing each coordinate individually (~24 bytes per entry in a HashSet),
+/// this uses 1 bit per coordinate in the world bounds, reducing memory usage by ~200x.
+///
+/// For a world of size W x H blocks, the bitmap uses only (W * H) / 8 bytes.
+pub struct BuildingFootprintBitmap {
+    /// The bitmap data, where each bit represents one (x, z) coordinate
+    bits: Vec<u8>,
+    /// Minimum x coordinate (offset for indexing)
+    min_x: i32,
+    /// Minimum z coordinate (offset for indexing)
+    min_z: i32,
+    /// Width of the world (max_x - min_x + 1)
+    width: usize,
+    /// Height of the world (max_z - min_z + 1)
+    height: usize,
+    /// Number of coordinates marked as building footprints
+    count: usize,
+}
+
+impl BuildingFootprintBitmap {
+    /// Creates a new empty bitmap covering the given world bounds.
+    pub fn new(xzbbox: &XZBBox) -> Self {
+        let min_x = xzbbox.min_x();
+        let min_z = xzbbox.min_z();
+        // Use i64 to avoid overflow when world spans more than i32::MAX in either dimension
+        let width = (i64::from(xzbbox.max_x()) - i64::from(min_x) + 1) as usize;
+        let height = (i64::from(xzbbox.max_z()) - i64::from(min_z) + 1) as usize;
+
+        // Calculate number of bytes needed (round up to nearest byte)
+        let total_bits = width
+            .checked_mul(height)
+            .expect("BuildingFootprintBitmap: world size too large (width * height overflowed)");
+        let num_bytes = total_bits.div_ceil(8);
+
+        Self {
+            bits: vec![0u8; num_bytes],
+            min_x,
+            min_z,
+            width,
+            height,
+            count: 0,
+        }
+    }
+
+    /// Converts (x, z) coordinate to bit index, returning None if out of bounds.
+    #[inline]
+    fn coord_to_index(&self, x: i32, z: i32) -> Option<usize> {
+        // Use i64 arithmetic to avoid overflow when coordinates span large ranges
+        let local_x = i64::from(x) - i64::from(self.min_x);
+        let local_z = i64::from(z) - i64::from(self.min_z);
+
+        if local_x < 0 || local_z < 0 {
+            return None;
+        }
+
+        let local_x = local_x as usize;
+        let local_z = local_z as usize;
+
+        if local_x >= self.width || local_z >= self.height {
+            return None;
+        }
+
+        // Safe: bounds checks above ensure this won't overflow (max = total_bits - 1)
+        Some(local_z * self.width + local_x)
+    }
+
+    /// Sets a coordinate as part of a building footprint.
+    #[inline]
+    pub fn set(&mut self, x: i32, z: i32) {
+        if let Some(bit_index) = self.coord_to_index(x, z) {
+            let byte_index = bit_index / 8;
+            let bit_offset = bit_index % 8;
+
+            // Safety: coord_to_index already validates bounds, so byte_index is always valid
+            let mask = 1u8 << bit_offset;
+            // Only increment count if bit wasn't already set
+            if self.bits[byte_index] & mask == 0 {
+                self.bits[byte_index] |= mask;
+                self.count += 1;
+            }
+        }
+    }
+
+    /// Checks if a coordinate is part of a building footprint.
+    #[inline]
+    pub fn contains(&self, x: i32, z: i32) -> bool {
+        if let Some(bit_index) = self.coord_to_index(x, z) {
+            let byte_index = bit_index / 8;
+            let bit_offset = bit_index % 8;
+
+            // Safety: coord_to_index already validates bounds, so byte_index is always valid
+            return (self.bits[byte_index] >> bit_offset) & 1 == 1;
+        }
+        false
+    }
+
+    /// Returns true if no coordinates are marked.
+    #[must_use]
+    #[allow(dead_code)] // Standard API method for collection-like types
+    pub fn is_empty(&self) -> bool {
+        self.count == 0
+    }
+}
+
 /// A cache of pre-computed flood fill results, keyed by element ID.
 pub struct FloodFillCache {
     /// Cached results: element_id -> filled coordinates
@@ -128,9 +235,51 @@ impl FloodFillCache {
                 && way.tags.get("area").map(|v| v == "yes").unwrap_or(false))
     }
 
-    /// Returns the number of cached way entries.
-    pub fn way_count(&self) -> usize {
-        self.way_cache.len()
+    /// Collects all building footprint coordinates from the pre-computed cache.
+    ///
+    /// This should be called after precompute() and before elements are processed.
+    /// Returns a memory-efficient bitmap of all (x, z) coordinates that are part of buildings.
+    ///
+    /// The bitmap uses only 1 bit per coordinate in the world bounds, compared to ~24 bytes
+    /// per entry in a HashSet, reducing memory usage by ~200x for large worlds.
+    pub fn collect_building_footprints(
+        &self,
+        elements: &[ProcessedElement],
+        xzbbox: &XZBBox,
+    ) -> BuildingFootprintBitmap {
+        let mut footprints = BuildingFootprintBitmap::new(xzbbox);
+
+        for element in elements {
+            match element {
+                ProcessedElement::Way(way) => {
+                    if way.tags.contains_key("building") || way.tags.contains_key("building:part") {
+                        if let Some(cached) = self.way_cache.get(&way.id) {
+                            for &(x, z) in cached {
+                                footprints.set(x, z);
+                            }
+                        }
+                    }
+                }
+                ProcessedElement::Relation(rel) => {
+                    if rel.tags.contains_key("building") || rel.tags.contains_key("building:part") {
+                        for member in &rel.members {
+                            // Only treat outer members as building footprints.
+                            // Inner members represent courtyards/holes where trees can spawn.
+                            if member.role == ProcessedMemberRole::Outer {
+                                if let Some(cached) = self.way_cache.get(&member.way.id) {
+                                    for &(x, z) in cached {
+                                        footprints.set(x, z);
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+                _ => {}
+            }
+        }
+
+        footprints
     }
 
     /// Removes a way's cached flood fill result, freeing memory.

src/gui.rs

@@ -1,5 +1,5 @@
 use crate::args::Args;
-use crate::coordinate_system::cartesian::XZPoint;
+use crate::coordinate_system::cartesian::{XZBBox, XZPoint};
 use crate::coordinate_system::geographic::{LLBBox, LLPoint};
 use crate::coordinate_system::transformation::CoordTransformer;
 use crate::data_processing::{self, GenerationOptions};
@@ -158,16 +158,20 @@ fn gui_select_world(generate_new: bool) -> Result<String, i32> {
 
     if generate_new {
         // Handle new world generation
-        if let Some(default_path) = &default_dir {
+        // Try Minecraft saves directory first, fall back to current directory
+        let target_path = 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
+                default_path.clone()
             } else {
-                Err(1) // Error code 1: Minecraft directory not found
+                // Minecraft directory doesn't exist, use current directory
+                env::current_dir().unwrap_or_else(|_| PathBuf::from("."))
             }
         } else {
-            Err(1) // Error code 1: Minecraft directory not found
-        }
+            // No default directory configured, use current directory
+            env::current_dir().unwrap_or_else(|_| PathBuf::from("."))
+        };
+
+        create_new_world(&target_path).map_err(|_| 3) // Error code 3: Failed to create new world
     } else {
         // Handle existing world selection
         // Open the directory picker dialog
@@ -433,36 +437,20 @@ fn add_localized_world_name(world_path: PathBuf, bbox: &LLBBox) -> PathBuf {
     world_path
 }
 
-// Function to update player position in level.dat based on spawn point coordinates
-fn update_player_position(
+/// Calculates the default spawn point at X=1, Z=1 relative to the world origin.
+/// This is used when no spawn point is explicitly selected by the user.
+fn calculate_default_spawn(xzbbox: &XZBBox) -> (i32, i32) {
+    (xzbbox.min_x() + 1, xzbbox.min_z() + 1)
+}
+
+/// Sets the player spawn point in level.dat using Minecraft XZ coordinates.
+/// The Y coordinate is set to a temporary value (150) and will be updated
+/// after terrain generation by `update_player_spawn_y_after_generation`.
+fn set_player_spawn_in_level_dat(
     world_path: &str,
-    spawn_point: Option<(f64, f64)>,
-    bbox_text: String,
-    scale: f64,
+    spawn_x: i32,
+    spawn_z: i32,
 ) -> 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;
 
@@ -494,21 +482,24 @@ fn update_player_position(
     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("SpawnX".to_string(), Value::Int(spawn_x));
             data.insert("SpawnY".to_string(), Value::Int(y as i32));
-            data.insert("SpawnZ".to_string(), Value::Int(xzpoint.z));
+            data.insert("SpawnZ".to_string(), Value::Int(spawn_z));
 
-            // Update player position
+            // Update player position if Player compound exists
             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;
+                    // Safely update position values with bounds checking
+                    if pos.len() >= 3 {
+                        if let Some(Value::Double(ref mut pos_x)) = pos.get_mut(0) {
+                            *pos_x = spawn_x as f64;
+                        }
+                        if let Some(Value::Double(ref mut pos_y)) = pos.get_mut(1) {
+                            *pos_y = y;
+                        }
+                        if let Some(Value::Double(ref mut pos_z)) = pos.get_mut(2) {
+                            *pos_z = spawn_z as f64;
+                        }
                     }
                 }
             }
@@ -540,19 +531,15 @@ fn update_player_position(
 }
 
 // Function to update player spawn Y coordinate based on terrain height after generation
+// This updates the spawn Y coordinate to be at terrain height + 3 blocks
 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() {
@@ -621,7 +608,7 @@ pub fn update_player_spawn_y_after_generation(
         let relative_z = existing_spawn_z - xzbbox.min_z();
         let terrain_point = XZPoint::new(relative_x, relative_z);
 
-        ground.level(terrain_point) + 2
+        ground.level(terrain_point) + 3 // Add 3 blocks above terrain for safety
     } else {
         -61 // Default Y if no terrain
     };
@@ -635,8 +622,8 @@ pub fn update_player_spawn_y_after_generation(
             // 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() {
+                    // Safely update Y position with bounds checking
+                    if let Some(Value::Double(ref mut pos_y)) = pos.get_mut(1) {
                         *pos_y = spawn_y as f64;
                     }
                 }
@@ -816,36 +803,49 @@ fn gui_start_generation(
     // Send generation click telemetry
     telemetry::send_generation_click();
 
-    // If spawn point was chosen and the world is new, check and set the spawn point
+    // For new Java worlds, set the spawn point in level.dat
     // Only update player position for Java worlds - Bedrock worlds don't have a pre-existing
     // level.dat to modify (the spawn point will be set when the .mcworld is created)
-    if is_new_world && spawn_point.is_some() && world_format != "bedrock" {
-        // 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);
-                }
-            };
+    if is_new_world && world_format != "bedrock" {
+        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 (transformer, xzbbox) = match CoordTransformer::llbbox_to_xzbbox(&llbbox, world_scale) {
+            Ok(result) => result,
+            Err(e) => {
+                let error_msg = format!("Failed to create coordinate transformer: {e}");
+                eprintln!("{error_msg}");
+                emit_gui_error(&error_msg);
+                return Err(error_msg);
+            }
+        };
+
+        let (spawn_x, spawn_z) = if let Some(coords) = spawn_point {
+            // User selected a spawn point - verify it's within bounds and convert to XZ
             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}"))?;
+                let xzpoint = transformer.transform_point(llpoint);
+                (xzpoint.x, xzpoint.z)
+            } else {
+                // Spawn point outside bounds, use default
+                calculate_default_spawn(&xzbbox)
             }
-        }
+        } else {
+            // No user-selected spawn point - use default at X=1, Z=1 relative to world origin
+            calculate_default_spawn(&xzbbox)
+        };
+
+        set_player_spawn_in_level_dat(&selected_world, spawn_x, spawn_z)
+            .map_err(|e| format!("Failed to set spawn point: {e}"))?;
     }
 
     tauri::async_runtime::spawn(async move {
@@ -933,6 +933,7 @@ fn gui_start_generation(
             };
 
             // Calculate MC spawn coordinates from lat/lng if spawn point was provided
+            // Otherwise, default to X=1, Z=1 (relative to xzbbox min coordinates)
             let mc_spawn_point: Option<(i32, i32)> = if let Some((lat, lng)) = spawn_point {
                 if let Ok(llpoint) = LLPoint::new(lat, lng) {
                     if let Ok((transformer, _)) =
@@ -947,7 +948,12 @@ fn gui_start_generation(
                     None
                 }
             } else {
-                None
+                // Default spawn point: X=1, Z=1 relative to world origin
+                if let Ok((_, xzbbox)) = CoordTransformer::llbbox_to_xzbbox(&bbox, world_scale) {
+                    Some(calculate_default_spawn(&xzbbox))
+                } else {
+                    None
+                }
             };
 
             // Create generation options
@@ -978,7 +984,6 @@ fn gui_start_generation(
                 fillground: fillground_enabled,
                 debug: false,
                 timeout: Some(std::time::Duration::from_secs(40)),
-                spawn_point,
             };
 
             // If skip_osm_objects is true (terrain-only mode), skip fetching and processing OSM data

src/gui/css/bbox.css

@@ -8,13 +8,9 @@ body,
   font-family: "Courier New", Courier, monospace;
 }
 
+/* Hide the BBOX coordinates display at bottom of map */
 #info-box {
-  position: absolute;
-  width: 100%;
-  height: auto;
-  bottom: 0;
-  border: 0 0 7px 0;
-  z-index: 10000;
+  display: none;
 }
 
 #coord-format {

src/gui/css/styles.css

@@ -32,9 +32,12 @@ p {
 
 .logo {
   height: 6em;
-  padding: 1.5em;
+  padding-top: 0.4em;
+  padding-bottom: 0.5em;
   will-change: filter;
   transition: 0.75s;
+  max-width: 950px;
+  max-height: 600px;
 }
 
 .logo.arnis:hover {
@@ -59,11 +62,11 @@ a:hover {
 
 .flex-container {
   display: flex;
-  gap: 20px;
+  gap: 15px;
   justify-content: center;
   align-items: stretch;
   margin-top: 5px;
-  min-height: 60vh;
+  min-height: 70vh;
 }
 
 .section {
@@ -75,34 +78,60 @@ a:hover {
 
 .map-box,
 .controls-box {
-  width: 45%;
-  background: #575757;
-  padding: 20px;
-  border-radius: 8px;
-  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
   display: flex;
   flex-direction: column;
 }
 
 .map-box {
-  min-height: 400px;
+  width: 63%;
+  min-height: 420px;
+  padding: 0;
+  overflow: hidden;
+  background: #575757;
+  border-radius: 8px;
+  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
+}
+
+.controls-box {
+  width: 32%;
+  background: transparent;
+  padding: 0;
+  border-radius: 0;
+  box-shadow: none;
 }
 
 .controls-content {
   display: flex;
   flex-direction: column;
   height: 100%;
+  justify-content: space-between;
 }
 
 .controls-box .progress-section {
-  margin-top: auto;
+  margin-top: 0;
+}
+
+.controls-top {
+  display: flex;
+  flex-direction: column;
+}
+
+.bbox-info-text {
+  font-size: 0.9em;
+  color: #ffffff;
+  display: block;
+  font-weight: bold;
+  min-height: 2.5em;
+  line-height: 1.25em;
+  margin-bottom: 5px;
 }
 
 .map-container {
-  border: 2px solid #e0e0e0;
+  border: none;
   border-radius: 8px;
   flex-grow: 1;
-  min-height: 300px;
+  width: 100%;
+  height: 100%;
 }
 
 .section h2 {
@@ -142,18 +171,26 @@ button:hover {
   margin-top: auto;
 }
 
-.progress-section h2 {
-  margin-bottom: 8px;
-  text-align: center;
+.progress-row {
+  display: flex;
+  align-items: center;
+  gap: 10px;
 }
 
 .progress-bar-container {
-  width: 100%;
+  flex: 1;
+  max-width: 80%;
   height: 20px;
   background-color: #e0e0e0;
   border-radius: 10px;
   overflow: hidden;
-  margin-top: 8px;
+}
+
+#progress-detail {
+  min-width: 40px;
+  text-align: right;
+  font-size: 0.9em;
+  color: #fff;
 }
 
 .progress-bar {
@@ -163,15 +200,6 @@ button:hover {
   transition: width 0.4s;
 }
 
-/* Left and right alignment for "Saving world..." text */
-.progress-status {
-  display: flex;
-  justify-content: space-between;
-  font-size: 0.9em;
-  margin-top: 8px;
-  color: #fff;
-}
-
 .footer {
   margin-top: 20px;
   text-align: center;
@@ -190,7 +218,7 @@ button:hover {
 @media (prefers-color-scheme: dark) {
   :root {
     color: #f6f6f6;
-    background-color: #2f2f2f;
+    background-color: #333333;
   }
 
   p {
@@ -233,6 +261,7 @@ button:hover {
   width: 100%;
   border-radius: 8px 8px 0 0 !important;
   margin-bottom: 0 !important;
+  margin-top: 0 !important;
   box-shadow: none !important;
 }
 
@@ -300,7 +329,7 @@ button:hover {
 }
 
 .modal-content {
-  background-color: #797979;
+  background-color: #717171;
   padding: 20px;
   border: 1px solid #797979;
   border-radius: 10px;
@@ -420,6 +449,20 @@ button:hover {
   box-shadow: 0 0 5px #fecc44;
 }
 
+#save-path {
+  width: 100%;
+  padding: 5px;
+  border: 1px solid #fecc44;
+  border-radius: 4px;
+  font-size: 14px;
+}
+
+#save-path:focus {
+  outline: none;
+  border-color: #fecc44;
+  box-shadow: 0 0 5px #fecc44;
+}
+
 /* Settings Modal Layout */
 .settings-row {
   display: flex;
@@ -431,6 +474,75 @@ button:hover {
 .settings-row label {
   text-align: left;
   flex: 1;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
+/* Tooltip icon (question mark in circle) */
+.tooltip-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 16px;
+  height: 16px;
+  border-radius: 50%;
+  background-color: rgba(254, 204, 68, 0.3);
+  color: #fecc44;
+  font-size: 11px;
+  font-weight: bold;
+  cursor: help;
+  position: relative;
+  flex-shrink: 0;
+}
+
+.tooltip-icon:hover {
+  background-color: rgba(254, 204, 68, 0.5);
+}
+
+/* Arnis-styled tooltip box */
+.tooltip-icon::after {
+  content: attr(data-tooltip);
+  position: absolute;
+  left: 50%;
+  bottom: calc(100% + 8px);
+  transform: translateX(-50%);
+  background-color: #2a2a2a;
+  color: #fecc44;
+  padding: 6px 14px;
+  border-radius: 6px;
+  font-size: 12px;
+  font-weight: normal;
+  white-space: nowrap;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
+  border: 1px solid #fecc44;
+  opacity: 0;
+  visibility: hidden;
+  transition: opacity 0.2s ease, visibility 0.2s ease;
+  z-index: 1000;
+  pointer-events: none;
+}
+
+/* Tooltip arrow */
+.tooltip-icon::before {
+  content: '';
+  position: absolute;
+  left: 50%;
+  bottom: calc(100% + 2px);
+  transform: translateX(-50%);
+  border: 6px solid transparent;
+  border-top-color: #fecc44;
+  opacity: 0;
+  visibility: hidden;
+  transition: opacity 0.2s ease, visibility 0.2s ease;
+  z-index: 1001;
+  pointer-events: none;
+}
+
+.tooltip-icon:hover::after,
+.tooltip-icon:hover::before {
+  opacity: 1;
+  visibility: visible;
 }
 
 .settings-control {

src/gui/index.html

@@ -20,60 +20,51 @@
     </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>
+      <!-- Left Box: Map -->
+      <section class="section map-box">
+        <iframe src="maps.html" width="100%" height="100%" class="map-container" title="Map Picker"></iframe>
       </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>
-
-          <!-- World Selection Container -->
-          <div class="world-selection-container">
-            <div class="tooltip" style="width: 100%;">
-              <button type="button" id="choose-world-btn" onclick="openWorldPicker()" class="choose-world-btn">
-                <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 class="controls-top">
+            <!-- World Selection Container -->
+            <div class="world-selection-container">
+              <div class="tooltip" style="width: 100%;">
+                <button type="button" id="choose-world-btn" onclick="openWorldPicker()" class="choose-world-btn">
+                  <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>
+              <!-- World Format Toggle -->
+              <div class="format-toggle-container">
+                <button type="button" id="format-java" class="format-toggle-btn format-active" onclick="setWorldFormat('java')">
+                  Java
+                </button>
+                <button type="button" id="format-bedrock" class="format-toggle-btn" onclick="setWorldFormat('bedrock')">
+                  Bedrock
+                </button>
+              </div>
             </div>
-            <!-- World Format Toggle -->
-            <div class="format-toggle-container">
-              <button type="button" id="format-java" class="format-toggle-btn format-active" onclick="setWorldFormat('java')">
-                Java
-              </button>
-              <button type="button" id="format-bedrock" class="format-toggle-btn" onclick="setWorldFormat('bedrock')">
-                Bedrock
+            
+            <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()" aria-label="Settings">
+                  <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12.22 2h-.44a2 2 0 0 0-2 2v.18a2 2 0 0 1-1 1.73l-.43.25a2 2 0 0 1-2 0l-.15-.08a2 2 0 0 0-2.73.73l-.22.38a2 2 0 0 0 .73 2.73l.15.1a2 2 0 0 1 1 1.72v.51a2 2 0 0 1-1 1.74l-.15.09a2 2 0 0 0-.73 2.73l.22.38a2 2 0 0 0 2.73.73l.15-.08a2 2 0 0 1 2 0l.43.25a2 2 0 0 1 1 1.73V20a2 2 0 0 0 2 2h.44a2 2 0 0 0 2-2v-.18a2 2 0 0 1 1-1.73l.43-.25a2 2 0 0 1 2 0l.15.08a2 2 0 0 0 2.73-.73l.22-.39a2 2 0 0 0-.73-2.73l-.15-.08a2 2 0 0 1-1-1.74v-.5a2 2 0 0 1 1-1.74l.15-.09a2 2 0 0 0 .73-2.73l-.22-.38a2 2 0 0 0-2.73-.73l-.15.08a2 2 0 0 1-2 0l-.43-.25a2 2 0 0 1-1-1.73V4a2 2 0 0 0-2-2z"></path><circle cx="12" cy="12" r="3"></circle></svg>
               </button>
             </div>
           </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()" aria-label="Settings">
-                <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12.22 2h-.44a2 2 0 0 0-2 2v.18a2 2 0 0 1-1 1.73l-.43.25a2 2 0 0 1-2 0l-.15-.08a2 2 0 0 0-2.73.73l-.22.38a2 2 0 0 0 .73 2.73l.15.1a2 2 0 0 1 1 1.72v.51a2 2 0 0 1-1 1.74l-.15.09a2 2 0 0 0-.73 2.73l.22.38a2 2 0 0 0 2.73.73l.15-.08a2 2 0 0 1 2 0l.43.25a2 2 0 0 1 1 1.73V20a2 2 0 0 0 2 2h.44a2 2 0 0 0 2-2v-.18a2 2 0 0 1 1-1.73l.43-.25a2 2 0 0 1 2 0l.15.08a2 2 0 0 0 2.73-.73l.22-.39a2 2 0 0 0-.73-2.73l-.15-.08a2 2 0 0 1-1-1.74v-.5a2 2 0 0 1 1-1.74l.15-.09a2 2 0 0 0 .73-2.73l-.22-.38a2 2 0 0 0-2.73-.73l-.15.08a2 2 0 0 1-2 0l-.43-.25a2 2 0 0 1-1-1.73V4a2 2 0 0 0-2-2z"></path><circle cx="12" cy="12" r="3"></circle></svg>
-            </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="bbox-info" class="bbox-info-text" data-localize="select_area_prompt">Select an area on the map using the tools.</span>
+            <div class="progress-row">
+              <div class="progress-bar-container">
+                <div class="progress-bar" id="progress-bar"></div>
+              </div>
               <span id="progress-detail">0%</span>
             </div>
           </div>
@@ -100,7 +91,10 @@
 
         <!-- Generation Mode Dropdown -->
         <div class="settings-row">
-          <label for="generation-mode-select" data-localize="generation_mode">Generation Mode</label>
+          <label for="generation-mode-select">
+            <span data-localize="generation_mode">Generation Mode</span>
+            <span class="tooltip-icon" data-tooltip="Choose what to generate: buildings/roads with terrain, just objects, or terrain only">?</span>
+          </label>
           <div class="settings-control">
             <select id="generation-mode-select" name="generation-mode-select" class="generation-mode-dropdown">
               <option value="geo-terrain" data-localize="mode_geo_terrain">Objects + Terrain</option>
@@ -110,25 +104,34 @@
           </div>
         </div>
 
-        <!-- Interior Toggle Button -->
-        <div class="settings-row">
-          <label for="interior-toggle" data-localize="interior">Interior Generation</label>
-          <div class="settings-control">
-            <input type="checkbox" id="interior-toggle" name="interior-toggle" checked>
-          </div>
-        </div>
-
         <!-- Roof Toggle Button -->
         <div class="settings-row">
-          <label for="roof-toggle" data-localize="roof">Roof Generation</label>
+          <label for="roof-toggle">
+            <span data-localize="roof">Roof Generation</span>
+            <span class="tooltip-icon" data-tooltip="Generate roofs on buildings">?</span>
+          </label>
           <div class="settings-control">
             <input type="checkbox" id="roof-toggle" name="roof-toggle" checked>
           </div>
         </div>
 
+        <!-- Interior Toggle Button -->
+        <div class="settings-row">
+          <label for="interior-toggle">
+            <span data-localize="interior">Interior Generation</span>
+            <span class="tooltip-icon" data-tooltip="Generate interior details inside buildings">?</span>
+          </label>
+          <div class="settings-control">
+            <input type="checkbox" id="interior-toggle" name="interior-toggle">
+          </div>
+        </div>
+
         <!-- Fill ground Toggle Button -->
         <div class="settings-row">
-          <label for="fillground-toggle" data-localize="fillground">Fill Ground</label>
+          <label for="fillground-toggle">
+            <span data-localize="fillground">Fill Ground</span>
+            <span class="tooltip-icon" data-tooltip="Fill the ground below the surface">?</span>
+          </label>
           <div class="settings-control">
             <input type="checkbox" id="fillground-toggle" name="fillground-toggle">
           </div>
@@ -136,7 +139,10 @@
 
         <!-- World Scale Slider -->
         <div class="settings-row">
-          <label for="scale-value-slider" data-localize="world_scale">World Scale</label>
+          <label for="scale-value-slider">
+            <span data-localize="world_scale">World Scale</span>
+            <span class="tooltip-icon" data-tooltip="Scale factor for the generated world (1.0 = real-world scale)">?</span>
+          </label>
           <div class="settings-control">
             <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>
@@ -145,7 +151,10 @@
 
         <!-- Bounding Box Input -->
         <div class="settings-row">
-          <label for="bbox-coords" data-localize="custom_bounding_box">Custom Bounding Box</label>
+          <label for="bbox-coords">
+            <span data-localize="custom_bounding_box">Custom Bounding Box</span>
+            <span class="tooltip-icon" data-tooltip="Manually enter coordinates (lat,lng,lat,lng) or use map selection">?</span>
+          </label>
           <div class="settings-control">
             <input type="text" id="bbox-coords" name="bbox-coords" maxlength="55" placeholder="Format: lat,lng,lat,lng">
           </div>
@@ -153,7 +162,10 @@
 
         <!-- Map Theme Selector -->
         <div class="settings-row">
-          <label for="tile-theme-select" data-localize="map_theme">Map Theme</label>
+          <label for="tile-theme-select">
+            <span data-localize="map_theme">Map Theme</span>
+            <span class="tooltip-icon" data-tooltip="Visual style of the map picker">?</span>
+          </label>
           <div class="settings-control">
             <select id="tile-theme-select" name="tile-theme-select" class="theme-dropdown">
               <option value="osm">Standard</option>
@@ -167,7 +179,10 @@
 
         <!-- Language Selector -->
         <div class="settings-row">
-          <label for="language-select" data-localize="language">Language</label>
+          <label for="language-select">
+            <span data-localize="language">Language</span>
+            <span class="tooltip-icon" data-tooltip="Interface language">?</span>
+          </label>
           <div class="settings-control">
             <select id="language-select" name="language-select" class="language-dropdown">
               <option value="en">English</option>
@@ -191,7 +206,10 @@
 
         <!-- Telemetry Consent Toggle -->
         <div class="settings-row">
-          <label for="telemetry-toggle">Anonymous Crash Reports</label>
+          <label for="telemetry-toggle" style="white-space: nowrap;">
+            <span>Anonymous Crash Reports</span>
+            <span class="tooltip-icon" data-tooltip="Send anonymous crash data to help improve Arnis">?</span>
+          </label>
           <div class="settings-control">
             <input type="checkbox" id="telemetry-toggle" name="telemetry-toggle">
           </div>

src/gui/js/main.js

@@ -12,6 +12,25 @@ if (window.__TAURI__) {
 
 const DEFAULT_LOCALE_PATH = `./locales/en.json`;
 
+// Track current bbox-info localization key for language changes
+let currentBboxInfoKey = "select_area_prompt";
+let currentBboxInfoColor = "#ffffff";
+
+// Helper function to set bbox-info text and track it for language changes
+async function setBboxInfo(bboxInfoElement, localizationKey, color) {
+  currentBboxInfoKey = localizationKey;
+  currentBboxInfoColor = color;
+  
+  // Ensure localization is available
+  let localization = window.localization;
+  if (!localization) {
+    localization = await getLocalization();
+  }
+  
+  localizeElement(localization, { element: bboxInfoElement }, localizationKey);
+  bboxInfoElement.style.color = color;
+}
+
 // Initialize elements and start the demo progress
 window.addEventListener("DOMContentLoaded", async () => {
   registerMessageEvent();
@@ -66,7 +85,7 @@ async function localizeElement(json, elementObject, localizedStringKey) {
   const attribute = localizedStringKey.startsWith("placeholder_") ? "placeholder" : "textContent";
 
   if (element) {
-    if (localizedStringKey in json) {
+    if (json && localizedStringKey in json) {
       element[attribute] = json[localizedStringKey];
     } else {
       // Fallback to default (English) string
@@ -78,13 +97,9 @@ async function localizeElement(json, elementObject, 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",
@@ -117,6 +132,13 @@ async function applyLocalization(localization) {
     localizeElement(localization, { selector: selector }, localizationElements[selector]);
   }
 
+  // Re-apply current bbox-info text with new language
+  const bboxInfo = document.getElementById("bbox-info");
+  if (bboxInfo && currentBboxInfoKey) {
+    localizeElement(localization, { element: bboxInfo }, currentBboxInfoKey);
+    bboxInfo.style.color = currentBboxInfoColor;
+  }
+
   // Update error messages
   window.localization = localization;
 }
@@ -165,7 +187,7 @@ async function checkForUpdates() {
       updateMessage.style.textDecoration = "none";
 
       localizeElement(window.localization, { element: updateMessage }, "new_version_available");
-      footer.style.marginTop = "15px";
+      footer.style.marginTop = "10px";
       footer.appendChild(updateMessage);
     }
   } catch (error) {
@@ -188,7 +210,7 @@ function registerMessageEvent() {
 // Function to set up the progress bar listener
 function setupProgressListener() {
   const progressBar = document.getElementById("progress-bar");
-  const progressMessage = document.getElementById("progress-message");
+  const bboxInfo = document.getElementById("bbox-info");
   const progressDetail = document.getElementById("progress-detail");
 
   window.__TAURI__.event.listen("progress-update", (event) => {
@@ -200,16 +222,16 @@ function setupProgressListener() {
     }
 
     if (message != "") {
-      progressMessage.textContent = message;
+      bboxInfo.textContent = message;
 
       if (message.startsWith("Error!")) {
-        progressMessage.style.color = "#fa7878";
+        bboxInfo.style.color = "#fa7878";
         generationButtonEnabled = true;
       } else if (message.startsWith("Done!")) {
-        progressMessage.style.color = "#7bd864";
+        bboxInfo.style.color = "#7bd864";
         generationButtonEnabled = true;
       } else {
-        progressMessage.style.color = "";
+        bboxInfo.style.color = "#ececec";
       }
     }
   });
@@ -525,11 +547,12 @@ function handleBboxInput() {
       
       // Clear the info text only if no map selection exists
       if (!mapSelectedBBox) {
-        bboxInfo.textContent = "";
-        bboxInfo.style.color = "";
+        setBboxInfo(bboxInfo, "select_area_prompt", "#ffffff");
       } else {
-        // Restore map selection display
-        displayBboxInfoText(mapSelectedBBox);
+        // Restore map selection info display but don't update input field
+        const [lng1, lat1, lng2, lat2] = mapSelectedBBox.split(" ").map(Number);
+        const selectedSize = calculateBBoxSize(lng1, lat1, lng2, lat2);
+        displayBboxSizeStatus(bboxInfo, selectedSize);
       }
       return;
     }
@@ -565,8 +588,7 @@ function handleBboxInput() {
         // Update the info text and mark custom input as valid
         customBBoxValid = true;
         selectedBBox = bboxText.replace(/,/g, ' '); // Convert to space format for consistency
-        localizeElement(window.localization, { element: bboxInfo }, "custom_selection_confirmed");
-        bboxInfo.style.color = "#7bd864";
+        setBboxInfo(bboxInfo, "custom_selection_confirmed", "#7bd864");
       } else {
         // Valid numbers but invalid order or range
         customBBoxValid = false;
@@ -576,8 +598,7 @@ function handleBboxInput() {
         } else {
           selectedBBox = mapSelectedBBox;
         }
-        localizeElement(window.localization, { element: bboxInfo }, "error_coordinates_out_of_range");
-        bboxInfo.style.color = "#fecc44";
+        setBboxInfo(bboxInfo, "error_coordinates_out_of_range", "#fecc44");
       }
     } else {
       // Input doesn't match the required format
@@ -588,8 +609,7 @@ function handleBboxInput() {
       } else {
         selectedBBox = mapSelectedBBox;
       }
-      localizeElement(window.localization, { element: bboxInfo }, "invalid_format");
-      bboxInfo.style.color = "#fecc44";
+      setBboxInfo(bboxInfo, "invalid_format", "#fecc44");
     }
   });
 }
@@ -638,6 +658,21 @@ let selectedBBox = "";
 let mapSelectedBBox = "";  // Tracks bbox from map selection
 let customBBoxValid = false;  // Tracks if custom input is valid
 
+/**
+ * Displays the appropriate bbox size status message based on area thresholds
+ * @param {HTMLElement} bboxInfo - The element to display the message in
+ * @param {number} selectedSize - The calculated bbox area in square meters
+ */
+function displayBboxSizeStatus(bboxInfo, selectedSize) {
+  if (selectedSize > threshold2) {
+    setBboxInfo(bboxInfo, "area_too_large", "#fa7878");
+  } else if (selectedSize > threshold1) {
+    setBboxInfo(bboxInfo, "area_extensive", "#fecc44");
+  } else {
+    setBboxInfo(bboxInfo, "selection_confirmed", "#7bd864");
+  }
+}
+
 // Function to handle incoming bbox data
 function displayBboxInfoText(bboxText) {
   let [lng1, lat1, lng2, lat2] = bboxText.split(" ").map(Number);
@@ -652,10 +687,12 @@ function displayBboxInfoText(bboxText) {
   customBBoxValid = false;
 
   const bboxInfo = document.getElementById("bbox-info");
+  const bboxCoordsInput = document.getElementById("bbox-coords");
 
   // Reset the info text if the bbox is 0,0,0,0
   if (lng1 === 0 && lat1 === 0 && lng2 === 0 && lat2 === 0) {
-    bboxInfo.textContent = "";
+    setBboxInfo(bboxInfo, "select_area_prompt", "#ffffff");
+    bboxCoordsInput.value = "";
     mapSelectedBBox = "";
     if (!customBBoxValid) {
       selectedBBox = "";
@@ -663,19 +700,13 @@ function displayBboxInfoText(bboxText) {
     return;
   }
 
+  // Update the custom bbox input with the map selection (comma-separated format)
+  bboxCoordsInput.value = `${lng1},${lat1},${lng2},${lat2}`;
+
   // 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";
-  }
+  displayBboxSizeStatus(bboxInfo, selectedSize);
 }
 
 let worldPath = "";
@@ -766,8 +797,7 @@ async function startGeneration() {
 
     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";
+      setBboxInfo(bboxInfo, "select_location_first", "#fa7878");
       return;
     }
 

src/gui/locales/ar.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "اختيار موقع",
-  "zoom_in_and_choose": "قم بالتكبير واختر منطقتك باستخدام أداة المستطيل",
-  "select_world": "تحديد عالم",
   "choose_world": "اختيار عالم",
   "no_world_selected": "لم يتم تحديد عالم",
   "start_generation": "بدء البناء",
-  "progress": "التقدم",
   "custom_selection_confirmed": "تم تأكيد التحديد المخصص!",
   "error_coordinates_out_of_range": "خطأ: الإحداثيات خارج النطاق أو مرتبة بشكل غير صحيح (مطلوب خط العرض قبل خط الطول).",
   "invalid_format": "تنسيق غير صالح. استخدم 'lat,lng,lat,lng' أو 'lat lng lat lng'.",
@@ -30,6 +26,7 @@
   "area_too_large": "تُعتبر هذه المنطقة كبيرة جدًا وقد تتجاوز حدود الحوسبة النموذجية.",
   "area_extensive": "المنطقة واسعة جدًا وقد تتطلب الكثير من الوقت والموارد.",
   "selection_confirmed": "تم تأكيد التحديد!",
+  "select_area_prompt": "حدد منطقة على الخريطة باستخدام الأدوات.",
   "unknown_error": "خطأ غير معروف",
   "license_and_credits": "الرخصة والمساهمون",
   "placeholder_bbox": "الصيغة: lat,lng,lat,lng",

src/gui/locales/de.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Standort auswählen",
-  "zoom_in_and_choose": "Zoome hinein und wähle dein Gebiet aus",
-  "select_world": "Welt auswählen",
   "choose_world": "Welt wählen",
   "no_world_selected": "Keine Welt ausgewählt",
   "start_generation": "Generierung starten",
-  "progress": "Fortschritt",
   "custom_selection_confirmed": "Benutzerdefinierte Auswahl bestätigt!",
   "error_coordinates_out_of_range": "Fehler: Koordinaten sind außerhalb des Bereichs oder falsch geordnet (Lat vor Lng erforderlich).",
   "invalid_format": "Ungültiges Format. Bitte verwende 'lat,lng,lat,lng' oder 'lat lng lat lng'.",
@@ -30,6 +26,7 @@
   "area_too_large": "Dieses Gebiet ist sehr groß und könnte das Berechnungslimit überschreiten.",
   "area_extensive": "Diese Gebietsgröße könnte längere Zeit für die Generierung benötigen.",
   "selection_confirmed": "Auswahl bestätigt!",
+  "select_area_prompt": "Wähle einen Bereich auf der Karte aus.",
   "unknown_error": "Unbekannter Fehler",
   "license_and_credits": "Lizenz und Credits",
   "placeholder_bbox": "Format: lat,lng,lat,lng",

src/gui/locales/en-US.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Select Location",
-  "zoom_in_and_choose": "Zoom in and choose your area using the rectangle tool",
-  "select_world": "Select World",
   "choose_world": "Choose World",
   "no_world_selected": "No world selected",
   "start_generation": "Start Generation",
-  "progress": "Progress",
   "custom_selection_confirmed": "Custom selection confirmed!",
   "error_coordinates_out_of_range": "Error: Coordinates are out of range or incorrectly ordered (Lat before Lng required).",
   "invalid_format": "Invalid format. Please use 'lat,lng,lat,lng' or 'lat lng lat lng'.",
@@ -30,6 +26,7 @@
   "area_too_large": "This area is very large and could exceed typical computing limits.",
   "area_extensive": "The area is quite extensive and may take significant time and resources.",
   "selection_confirmed": "Selection confirmed!",
+  "select_area_prompt": "Select an area on the map using the tools.",
   "unknown_error": "Unknown error",
   "license_and_credits": "License and Credits",
   "placeholder_bbox": "Format: lat,lng,lat,lng",

src/gui/locales/es.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Seleccionar ubicación",
-  "zoom_in_and_choose": "Acércate y elige tu área usando la herramienta de rectángulo",
-  "select_world": "Seleccionar mundo",
   "choose_world": "Elegir mundo",
   "no_world_selected": "Ningún mundo seleccionado",
   "start_generation": "Iniciar generación",
-  "progress": "Progreso",
   "custom_selection_confirmed": "¡Selección personalizada confirmada!",
   "error_coordinates_out_of_range": "Error: Las coordenadas están fuera de rango o están ordenadas incorrectamente (Lat antes de Lng requerido).",
   "invalid_format": "Formato inválido. Por favor, use 'lat,lng,lat,lng' o 'lat lng lat lng'.",
@@ -30,6 +26,7 @@
   "area_too_large": "Esta área es muy grande y podría exceder los límites típicos de computación.",
   "area_extensive": "El área es bastante extensa y puede requerir mucho tiempo y recursos.",
   "selection_confirmed": "¡Selección confirmada!",
+  "select_area_prompt": "Selecciona un área en el mapa usando las herramientas.",
   "unknown_error": "Unknown error",
   "license_and_credits": "License and Credits",
   "placeholder_bbox": "Format: lat,lng,lat,lng",

src/gui/locales/fi.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Valitse paikka",
-  "zoom_in_and_choose": "Zoomaa ja valitse paikka käyttämällä suorakulmatyökalua.",
-  "select_world": "Valitse maailma",
   "choose_world": "Valitse maailma",
   "no_world_selected": "Maailmaa ei valittu",
   "start_generation": "Aloita generointi",
-  "progress": "Edistys",
   "custom_selection_confirmed": "Mukautettu valinta vahvistettu!",
   "error_coordinates_out_of_range": "Virhe: Koordinaatit ovat kantaman ulkopuolella tai vääriin aseteltu (Lat ennen Lng vaadittu).",
   "invalid_format": "Väärä formaatti. Käytä 'lat,lng,lat,lng' tai 'lat lng lat lng'.",
@@ -30,6 +26,7 @@
   "area_too_large": "Tämä alue on todella iso ja voi ylittää tyypilliset laskentarajat.",
   "area_extensive": "Alue on aika laaja ja voi viedä pitkän ajan ja resursseja.",
   "selection_confirmed": "Valinta vahvistettu!",
+  "select_area_prompt": "Valitse alue kartalta työkaluilla.",
   "unknown_error": "Tuntematon virhe",
   "license_and_credits": "Lisenssi ja krediitit",
   "placeholder_bbox": "Formaatti: lat,lng,lat,lng",

src/gui/locales/fr-FR.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Sélectionner une localisation",
-  "zoom_in_and_choose": "Zoomez et choisissez votre zone avec l'outil rectangle",
-  "select_world": "Sélectionner un monde",
   "choose_world": "Choisir un monde",
   "no_world_selected": "Aucun monde sélectionné",
   "start_generation": "Commencer la génération",
-  "progress": "Progrès",
   "custom_selection_confirmed": "Sélection personnalisée confirmée !",
   "error_coordinates_out_of_range": "Erreur: Coordonnées hors de portée ou dans un ordre incorrect (besoin de la latitude avant la longitude).",
   "invalid_format": "Format invalide. Utilisez 'lat,lng,lat,lng' ou 'lat lng lat lng'.",
@@ -30,6 +26,7 @@
   "area_too_large": "Cette zone est très grande et pourrait dépasser les limites de calcul courantes.",
   "area_extensive": "Cette zone est très étendue et pourrait nécessiter beaucoup de ressources et de temps.",
   "selection_confirmed": "Sélection confirmée !",
+  "select_area_prompt": "Sélectionnez une zone sur la carte avec les outils.",
   "unknown_error": "Erreur inconnue",
   "license_and_credits": "Licence et crédits",
   "placeholder_bbox": "Format: lat,lng,lat,lng",

src/gui/locales/hu.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Hely kiválasztása",
-  "zoom_in_and_choose": "Nagyíts és jelöld ki a területet a kijelölő eszközzel",
-  "select_world": "Világ kijelölése",
   "choose_world": "Világ kiválasztása",
   "no_world_selected": "Nincs világ kiválasztva",
   "start_generation": "Generálás indítása",
-  "progress": "Haladás",
   "custom_selection_confirmed": "Egyéni kiválasztás megerősítve",
   "error_coordinates_out_of_range": "Hiba: A koordináták tartományon kívül vannak vagy hibásan rendezettek (a szélességi foknak a hosszúsági fok előtt kell lennie)",
   "invalid_format": "Érvénytelen formátum. Kérjük, használja a 'lat,lng,lat,lng' vagy a 'lat lng lat lng' formátumot.'.",
@@ -30,6 +26,7 @@
   "area_too_large": "Ez a terület nagyon nagy, és meghaladhatja a szokásos számítási korlátokat.",
   "area_extensive": "A terület meglehetősen kiterjedt, és jelentős időt és erőforrásokat igényelhet.",
   "selection_confirmed": "Kiválasztás megerősítve",
+  "select_area_prompt": "Jelölj ki egy területet a térképen az eszközökkel.",
   "unknown_error": "Ismeretlen hiba",
   "license_and_credits": "Licenc és elismerés.",
   "placeholder_bbox": "Formátum: lat,lng,lat,lng",

src/gui/locales/ko.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "장소 선택",
-  "zoom_in_and_choose": "줌 인하고 직사각형 도구를 사용하여 영역을 선택하세요.",
-  "select_world": "세계 선택",
   "choose_world": "세계 선택",
   "no_world_selected": "선택된 세계 없음",
   "start_generation": "생성 시작",
-  "progress": "진행",
   "custom_selection_confirmed": "사용자 지정 선택이 확인되었습니다!",
   "error_coordinates_out_of_range": "오류: 좌표가 범위를 벗어나거나 잘못된 순서입니다 (Lat이 Lng보다 먼저 필요합니다).",
   "invalid_format": "잘못된 형식입니다. 'lat,lng,lat,lng' 또는 'lat lng lat lng' 형식을 사용하세요.",
@@ -28,8 +24,9 @@
   "select_minecraft_world_first": "먼저 마인크래프트 세계를 선택하세요!",
   "select_location_first": "먼저 위치를 선택하세요!",
   "area_too_large": "이 지역은 매우 크고, 일반적인 계산 한계를 초과할 수 있습니다.",
-  "area_extensive": "이 지역은 꽤 광범위하여 значитель한 시간과 자원이 필요할 수 있습니다.",
+  "area_extensive": "이 지역은 꽤 광범위하여 상당한 시간과 자원이 필요할 수 있습니다.",
   "selection_confirmed": "선택이 확인되었습니다!",
+  "select_area_prompt": "도구를 사용하여 지도에서 영역을 선택하세요.",
   "unknown_error": "Unknown error",
   "license_and_credits": "License and Credits",
   "placeholder_bbox": "Format: lat,lng,lat,lng",

src/gui/locales/lt.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Vietos pasirinkimas",
-  "zoom_in_and_choose": "Pasididinkite žemėlapį ir pasirinkite plotą su kvadrato įrankiu",
-  "select_world": "Pasaulio pasirinkimas",
   "choose_world": "Pasirinkti pasaulį",
   "no_world_selected": "Pasaulis nepasirinktas",
   "start_generation": "Pradėti generaciją",
-  "progress": "Progresas",
   "custom_selection_confirmed": "Rėmo pasirinkimas patvirtintas!",
   "error_coordinates_out_of_range": "Klaida: Koordinatės yra už ribų arba neteisingai išdėstytos (plat turi būti prieš ilg).",
   "invalid_format": "Neteisingas formatas. Prašome naudoti 'plat,ilg,plat,ilg' arba 'plat ilg plat ilg'.",
@@ -30,6 +26,7 @@
   "area_too_large": "Šis plotas yra labai didelis ir gali viršyti tipinius resursų limitus.",
   "area_extensive": "Šis plotas yra pakankamai didelis kuriam reikėtų daug laiko ir resursų.",
   "selection_confirmed": "Pasirinkimas patvirtintas!",
+  "select_area_prompt": "Pasirinkite plotą žemėlapyje naudodami įrankius.",
   "unknown_error": "Nežinoma klaida",
   "license_and_credits": "Licencija ir padėkos",
   "placeholder_bbox": "Formatas: plat,lyg,plat,lyg",

src/gui/locales/lv.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Izvēlēties atrašanās vietu",
-  "zoom_in_and_choose": "Pietuviniet un izvēlieties apgabalu",
-  "select_world": "Izvēlēties pasauli",
   "choose_world": "Izvēlēties pasauli",
   "no_world_selected": "Pasaulē nav izvēlēta",
   "start_generation": "Sākt ģenerēšanu",
-  "progress": "Progress",
   "custom_selection_confirmed": "Pielāgota izvēle apstiprināta!",
   "error_coordinates_out_of_range": "Kļūda: koordinātas ir ārpus darbības zonas vai norādītas nepareizā secībā (vispirms platums, tad garums)",
   "invalid_format": "Nederīgs formāts. Izmantojiet 'platums,garums,platums,garums' vai 'platums garums platums garums'",
@@ -30,6 +26,7 @@
   "area_too_large": "Šis apgabals ir pārāk liels un var pārsniegt tipiskos aprēķina ierobežojumus",
   "area_extensive": "Apgabals ir diezgan plašs un var prasīt ievērojamu laiku un resursus",
   "selection_confirmed": "Izvēle apstiprināta!",
+  "select_area_prompt": "Izvēlieties apgabalu kartē, izmantojot rīkus.",
   "unknown_error": "Nezināma kļūda",
   "license_and_credits": "Licence un autori",
   "placeholder_bbox": "Formāts: platums,garums,platums,garums",

src/gui/locales/pl.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Wybierz lokalizację",
-  "zoom_in_and_choose": "Przybliż i zaznacz obszar za pomocą prostokąta",
-  "select_world": "Wybierz świat",
   "choose_world": "Wybierz świat",
   "no_world_selected": "Nie wybrano świata",
   "start_generation": "Rozpocznij generowanie",
-  "progress": "Postęp",
   "custom_selection_confirmed": "Niestandardowy wybór potwierdzony!",
   "error_coordinates_out_of_range": "Błąd: Współrzędne są poza zakresem lub w złej kolejności (wymagana szerokość przed długością).",
   "invalid_format": "Nieprawidłowy format. Użyj 'szer.,dł.,szer.,dł.' lub 'szer. dł. szer. dł.'.",
@@ -30,6 +26,7 @@
   "area_too_large": "Ten obszar jest bardzo duży i może przekroczyć limity obliczeniowe.",
   "area_extensive": "Ten obszar jest rozległy i może pochłonąć dużo czasu oraz zasobów.",
   "selection_confirmed": "Wybór potwierdzony!",
+  "select_area_prompt": "Zaznacz obszar na mapie za pomocą narzędzi.",
   "unknown_error": "Nieznany błąd",
   "license_and_credits": "Licencja i autorzy",
   "placeholder_bbox": "Format: szer,dł,szer,dł",

src/gui/locales/ru.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Выбрать местоположение",
-  "zoom_in_and_choose": "Приблизьте и выберите область",
-  "select_world": "Выбрать мир",
   "choose_world": "Выбрать мир",
   "no_world_selected": "Мир не выбран",
   "start_generation": "Начать генерацию",
-  "progress": "Прогресс",
   "custom_selection_confirmed": "Пользовательский выбор подтвержден!",
   "error_coordinates_out_of_range": "Ошибка: Координаты находятся вне зоны действия или указаны в неправильном порядке (сначала широта, затем долгота)",
   "invalid_format": "Неверный формат. Используйте 'широта,долгота,широта,долгота' или 'широта долгота широта долгота'",
@@ -30,6 +26,7 @@
   "area_too_large": "Эта область слишком велика и может превысить типичные вычислительные ограничения",
   "area_extensive": "Область довольно обширна и может потребовать значительного времени и ресурсов",
   "selection_confirmed": "Выбор подтвержден!",
+  "select_area_prompt": "Выберите область на карте с помощью инструментов.",
   "unknown_error": "Неизвестная ошибка",
   "license_and_credits": "Лицензия и авторы",
   "placeholder_bbox": "Формат: широта,долгота,широта,долгота",

src/gui/locales/sv.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Välj plats",
-  "zoom_in_and_choose": "Zooma in och välj ditt område med rektangulärt verktyg",
-  "select_world": "Välj värld",
   "choose_world": "Välj värld",
   "no_world_selected": "Ingen värld vald",
   "start_generation": "Starta generering",
-  "progress": "Framsteg",
   "custom_selection_confirmed": "Anpassad markering bekräftad!",
   "error_coordinates_out_of_range": "Fel: Koordinater är utanför området eller felaktigt ordnade (Lat före Lng krävs).",
   "invalid_format": "Ogiltigt format. Använd 'lat,lng,lat,lng' eller 'lat lng lat lng'.",
@@ -30,6 +26,7 @@
   "area_too_large": "Detta område är mycket stort och kan överskrida vanliga beräkningsgränser.",
   "area_extensive": "Området är ganska extensivt och kan ta betydande tid och resurser.",
   "selection_confirmed": "Val bekräftat!",
+  "select_area_prompt": "Välj ett område på kartan med verktygen.",
   "unknown_error": "Unknown error",
   "license_and_credits": "License and Credits",
   "placeholder_bbox": "Format: lat,lng,lat,lng",

src/gui/locales/ua.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "Обрати локацію",
-  "zoom_in_and_choose": "Збільште і оберіть область за допомогою прямокутника",
-  "select_world": "Обрати світ",
   "choose_world": "Обрати світ",
   "no_world_selected": "Світ не обрано",
   "start_generation": "Почати генерацію",
-  "progress": "Прогрес",
   "custom_selection_confirmed": "Користувацький вибір підтверджено!",
   "error_coordinates_out_of_range": "Помилка: Координати поза діапазоном або неправильно впорядковані (потрібно широта перед довгота)",
   "invalid_format": "Неправильний формат. Будь ласка, використовуйте 'широта,довгота,широта,довгота' або 'широта довгота широта довгота'",
@@ -30,6 +26,7 @@
   "area_too_large": "Ця область дуже велика і може перевищити типові обчислювальні межі",
   "area_extensive": "Область досить велика і може вимагати значного часу та ресурсів",
   "selection_confirmed": "Вибір підтверджено!",
+  "select_area_prompt": "Виберіть область на карті за допомогою інструментів.",
   "unknown_error": "Unknown error",
   "license_and_credits": "License and Credits",
   "placeholder_bbox": "Format: lat,lng,lat,lng",

src/gui/locales/zh-CN.json

@@ -1,11 +1,7 @@
 {
-  "select_location": "选择位置",
-  "zoom_in_and_choose": "放大并使用矩形工具选择您的区域",
-  "select_world": "选择世界",
   "choose_world": "选择世界",
   "no_world_selected": "未选择世界",
   "start_generation": "开始生成",
-  "progress": "进度",
   "custom_selection_confirmed": "自定义选择已确认！",
   "error_coordinates_out_of_range": "错误：坐标超出范围或顺序不正确（需要先纬度后经度）。",
   "invalid_format": "格式无效。请使用 'lat,lng,lat,lng' 或 'lat lng lat lng'。",
@@ -30,6 +26,7 @@
   "area_too_large": "该区域非常大，可能会超出典型的计算限制。",
   "area_extensive": "该区域相当广泛，可能需要大量时间和资源。",
   "selection_confirmed": "选择已确认！",
+  "select_area_prompt": "使用工具在地图上选择一个区域。",
   "unknown_error": "未知错误",
   "license_and_credits": "许可证和致谢",
   "placeholder_bbox": "格式: lat,lng,lat,lng",

src/world_editor/bedrock.rs

@@ -215,8 +215,11 @@ impl BedrockWriter {
             .ground
             .as_ref()
             .map(|ground| {
-                let coord = crate::coordinate_system::cartesian::XZPoint::new(spawn_x, spawn_z);
-                ground.level(coord) + 2 // Add 2 blocks above ground for safety
+                // Ground elevation data expects coordinates relative to the XZ bbox origin
+                let rel_x = spawn_x - xzbbox.min_x();
+                let rel_z = spawn_z - xzbbox.min_z();
+                let coord = crate::coordinate_system::cartesian::XZPoint::new(rel_x, rel_z);
+                ground.level(coord) + 3 // Add 3 blocks above ground for safety
             })
             .unwrap_or(64);
 

src/world_editor/common.rs

@@ -155,7 +155,7 @@ impl SectionToModify {
         let palette = unique_blocks
             .iter()
             .map(|(block, stored_props)| PaletteItem {
-                name: block.name().to_string(),
+                name: format!("{}:{}", block.namespace(), block.name()),
                 properties: stored_props.clone().or_else(|| block.properties()),
             })
             .collect();

src/world_editor/java.rs

@@ -1,7 +1,6 @@
 //! Java Edition Anvil format world saving.
 //!
 //! This module handles saving worlds in the Java Edition Anvil (.mca) format.
-//! Supports streaming mode for memory-efficient saving of large worlds.
 
 use super::common::{Chunk, ChunkToModify, Section};
 use super::WorldEditor;
@@ -12,9 +11,11 @@ use fastanvil::Region;
 use fastnbt::Value;
 use fnv::FnvHashMap;
 use indicatif::{ProgressBar, ProgressStyle};
+use rayon::prelude::*;
 use std::collections::HashMap;
 use std::fs::File;
 use std::io::Write;
+use std::sync::atomic::{AtomicU64, Ordering};
 
 #[cfg(feature = "gui")]
 use crate::telemetry::{send_log, LogLevel};
@@ -77,8 +78,7 @@ impl<'a> WorldEditor<'a> {
 
     /// Saves the world in Java Edition Anvil format.
     ///
-    /// Uses streaming mode: saves regions one at a time and releases memory after each,
-    /// significantly reducing peak memory usage for large worlds.
+    /// Uses parallel processing with rayon for fast region saving.
     pub(super) fn save_java(&mut self) {
         println!("{} Saving world...", "[7/7]".bold());
         emit_gui_progress_update(90.0, "Saving world...");
@@ -102,35 +102,26 @@ impl<'a> WorldEditor<'a> {
                 .progress_chars("█▓░"),
         );
 
-        // Streaming mode: Process regions sequentially and release memory after each.
-        // This significantly reduces peak memory for large worlds (100+ regions).
-        // For small worlds, the overhead is negligible.
-        let mut regions_processed: u64 = 0;
+        let regions_processed = AtomicU64::new(0);
 
-        // Collect region keys first to allow draining
-        let region_keys: Vec<(i32, i32)> = self.world.regions.keys().copied().collect();
+        self.world
+            .regions
+            .par_iter()
+            .for_each(|((region_x, region_z), region_to_modify)| {
+                self.save_single_region(*region_x, *region_z, region_to_modify);
 
-        for (region_x, region_z) in region_keys {
-            // Remove region from memory - this is the key to memory savings
-            if let Some(region_to_modify) = self.world.regions.remove(&(region_x, region_z)) {
-                self.save_single_region(region_x, region_z, &region_to_modify);
+                // Update progress
+                let regions_done = regions_processed.fetch_add(1, Ordering::SeqCst) + 1;
 
-                // Region memory is freed when region_to_modify goes out of scope here
-            }
+                // Update progress at regular intervals (every ~10% or at least every 10 regions)
+                let update_interval = (total_regions / 10).max(1);
+                if regions_done.is_multiple_of(update_interval) || regions_done == total_regions {
+                    let progress = 90.0 + (regions_done as f64 / total_regions as f64) * 9.0;
+                    emit_gui_progress_update(progress, "Saving world...");
+                }
 
-            regions_processed += 1;
-
-            // Update progress at regular intervals
-            let update_interval = (total_regions / 10).max(1);
-            if regions_processed.is_multiple_of(update_interval)
-                || regions_processed == total_regions
-            {
-                let progress = 90.0 + (regions_processed as f64 / total_regions as f64) * 9.0;
-                emit_gui_progress_update(progress, "Saving world...");
-            }
-
-            save_pb.inc(1);
-        }
+                save_pb.inc(1);
+            });
 
         save_pb.finish();
     }

tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Arnis",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "identifier": "com.louisdev.arnis",
   "build": {
     "frontendDist": "src/gui"