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Fix GlobalSDF for meshes intersections for negative distances inside the geometry

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This commit is contained in:
Wojtek Figat
2024-06-02 12:06:25 +02:00
parent eab96f2086
commit 79ee6a973e
1 changed files with 10 additions and 2 deletions
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12
Source/Shaders/GlobalSignDistanceField.shader
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@@ -60,6 +60,14 @@ float CombineDistanceToSDF(float sdf, float distanceToSDF)
return sqrt(Square(max(sdf, 0)) + Square(distanceToSDF)); return sqrt(Square(max(sdf, 0)) + Square(distanceToSDF));
} }
float CombineSDF(float oldSdf, float newSdf)
{
// Use distance closer to 0
if (oldSdf < 0 && newSdf < 0)
return max(oldSdf, newSdf);
return min(oldSdf, newSdf);
}
#if defined(_CS_RasterizeModel) || defined(_CS_RasterizeHeightfield) #if defined(_CS_RasterizeModel) || defined(_CS_RasterizeHeightfield)
RWTexture3D<float> GlobalSDFTex : register(u0); RWTexture3D<float> GlobalSDFTex : register(u0);
@@ -127,7 +135,7 @@ void CS_RasterizeModel(uint3 DispatchThreadId : SV_DispatchThreadID)
{ {
ObjectRasterizeData objectData = ObjectsBuffer[Objects[i / 4][i % 4]]; ObjectRasterizeData objectData = ObjectsBuffer[Objects[i / 4][i % 4]];
float objectDistance = DistanceToModelSDF(minDistance, objectData, ObjectsTextures[i], voxelWorldPos); float objectDistance = DistanceToModelSDF(minDistance, objectData, ObjectsTextures[i], voxelWorldPos);
minDistance = min(minDistance, objectDistance); minDistance = CombineSDF(minDistance, objectDistance);
} }
GlobalSDFTex[voxelCoord] = clamp(minDistance / MaxDistance, -1, 1); GlobalSDFTex[voxelCoord] = clamp(minDistance / MaxDistance, -1, 1);
} }
@@ -177,7 +185,7 @@ void CS_RasterizeHeightfield(uint3 DispatchThreadId : SV_DispatchThreadID)
float objectDistance = dot(heightfieldNormal, voxelWorldPos - heightfieldPosition); float objectDistance = dot(heightfieldNormal, voxelWorldPos - heightfieldPosition);
if (objectDistance < thickness) if (objectDistance < thickness)
objectDistance = thickness - objectDistance; objectDistance = thickness - objectDistance;
minDistance = min(minDistance, objectDistance); minDistance = CombineSDF(minDistance, objectDistance);
} }
GlobalSDFTex[voxelCoord] = clamp(minDistance / MaxDistance, -1, 1); GlobalSDFTex[voxelCoord] = clamp(minDistance / MaxDistance, -1, 1);
} }