mirror of
https://github.com/Facepunch/sbox-public.git
synced 2026-01-25 22:59:28 -05:00
87a6fde918
- Now supports drawing on a BaseLayer and OverlayLayer - Terrain Tools displays a material palette in a sidebar - Added C# API to sample terrain material at a given position - Can now import multiple splatmaps at once mapping to texture indices ( [0, 3], [4, 7], etc.) https://files.facepunch.com/antopilo/1b0511b1/sbox-dev_An6nbxpqe3.mp4
100 lines
2.9 KiB
C#
100 lines
2.9 KiB
C#
namespace Sandbox;
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public partial class Terrain
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{
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/// <summary>
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/// Information about terrain materials at a specific position
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/// </summary>
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public struct TerrainMaterialInfo
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{
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/// <summary>
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/// The base (primary) material index at this position
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/// </summary>
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public int BaseTextureId { get; set; }
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/// <summary>
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/// The overlay (secondary) material index at this position
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/// </summary>
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public int OverlayTextureId { get; set; }
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/// <summary>
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/// Blend factor between base and overlay (0-1, where 0 = full base, 1 = full overlay)
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/// </summary>
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public float BlendFactor { get; set; }
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/// <summary>
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/// Whether this position is marked as a hole
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/// </summary>
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public bool IsHole { get; set; }
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/// <summary>
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/// The base terrain material resource (if available)
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/// </summary>
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public TerrainMaterial BaseMaterial { get; set; }
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/// <summary>
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/// The overlay terrain material resource (if available)
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/// </summary>
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public TerrainMaterial OverlayMaterial { get; set; }
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/// <summary>
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/// Gets the dominant material at this position based on blend factor
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/// </summary>
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public TerrainMaterial GetDominantMaterial() => BlendFactor < 0.5f ? BaseMaterial : OverlayMaterial;
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/// <summary>
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/// Gets the dominant material index at this position based on blend factor
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/// </summary>
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public int GetDominantMaterialIndex() => BlendFactor < 0.5f ? BaseTextureId : OverlayTextureId;
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}
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/// <summary>
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/// Gets terrain material information at a world position.
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/// Returns null if the position is outside terrain bounds.
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/// </summary>
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public TerrainMaterialInfo? GetMaterialAtWorldPosition( Vector3 worldPosition )
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{
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if ( Storage is null || Storage.ControlMap is null )
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return null;
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// Convert world position to local terrain space
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var localPosition = WorldTransform.PointToLocal( worldPosition );
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// Convert local position to UV
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var uv = new Vector2(
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localPosition.x / Storage.TerrainSize,
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localPosition.y / Storage.TerrainSize
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);
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// We're outside of the plane
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if ( uv.x < 0 || uv.x > 1 || uv.y < 0 || uv.y > 1 )
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return null;
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// Convert texture coordinates
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var x = (int)(uv.x * Storage.Resolution);
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var y = (int)(uv.y * Storage.Resolution);
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// Get the packed material
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var index = y * Storage.Resolution + x;
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var packedMaterial = Storage.ControlMap[index];
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var material = new CompactTerrainMaterial( packedMaterial );
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// Create the result
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var result = new TerrainMaterialInfo
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{
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BaseTextureId = material.BaseTextureId,
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OverlayTextureId = material.OverlayTextureId,
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BlendFactor = material.BlendFactor / 255.0f,
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IsHole = material.IsHole
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};
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if ( material.BaseTextureId < Storage.Materials.Count )
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result.BaseMaterial = Storage.Materials[material.BaseTextureId];
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if ( material.OverlayTextureId < Storage.Materials.Count )
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result.OverlayMaterial = Storage.Materials[material.OverlayTextureId];
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return result;
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}
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}
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