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Add more precise Global SDF raycasting nearby geometry (at cost of performance)

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Wojtek Figat
2024-06-13 17:05:31 +02:00
parent 2f688892ea
commit eeede88fb8
1 changed files with 5 additions and 1 deletions
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6
Source/Shaders/GlobalSignDistanceField.hlsl
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@@ -250,6 +250,7 @@ GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, T
for (; step < 250 && stepTime < intersections.y && hit.HitTime < 0.0f; step++) for (; step < 250 && stepTime < intersections.y && hit.HitTime < 0.0f; step++)
{ {
float3 stepPosition = worldPosition + trace.WorldDirection * stepTime; float3 stepPosition = worldPosition + trace.WorldDirection * stepTime;
float stepScale = trace.StepScale;
// Sample SDF // Sample SDF
float cascadeMaxDistance; float cascadeMaxDistance;
@@ -260,7 +261,10 @@ GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, T
{ {
float stepDistanceTex = tex.SampleLevel(SamplerLinearClamp, textureUV, 0); float stepDistanceTex = tex.SampleLevel(SamplerLinearClamp, textureUV, 0);
if (stepDistanceTex < chunkMarginDistance) if (stepDistanceTex < chunkMarginDistance)
{
stepDistance = stepDistanceTex; stepDistance = stepDistanceTex;
stepScale *= 0.63f; // Perform smaller steps nearby geometry
}
} }
else else
{ {
@@ -292,7 +296,7 @@ GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, T
} }
// Move forward // Move forward
stepTime += max(stepDistance * trace.StepScale, voxelSize); stepTime += max(stepDistance * stepScale, voxelSize);
} }
hit.StepsCount += step; hit.StepsCount += step;
} }