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Various improvements to Global Surface Atlas sampling

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This commit is contained in:
Wojciech Figat
2022-06-28 14:10:01 +02:00
parent 5ee8785ede
commit df691e62f8
6 changed files with 50 additions and 44 deletions
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9
Source/Shaders/GlobalSignDistanceField.hlsl
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@@ -157,7 +157,8 @@ float3 SampleGlobalSDFGradient(const GlobalSDFData data, Texture3D<float> tex, T
}
// Ray traces the Global SDF.
GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, Texture3D<float> mip, const GlobalSDFTrace trace)
// cascadeTraceStartBias - scales the trace start position offset (along the trace direction) by cascade voxel size (reduces artifacts on far cascades). Use it for shadow rays to prevent self-occlusion when tracing from object surface that looses quality in far cascades.
GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, Texture3D<float> mip, const GlobalSDFTrace trace, float cascadeTraceStartBias = 0.0f)
{
GlobalSDFHit hit = (GlobalSDFHit)0;
hit.HitTime = -1.0f;
@@ -169,13 +170,13 @@ GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, T
for (uint cascade = 0; cascade < data.CascadesCount && hit.HitTime < 0.0f; cascade++)
{
float4 cascadePosDistance = data.CascadePosDistance[cascade];
float cascadeMaxDistance = cascadePosDistance.w * 2;
float voxelSize = data.CascadeVoxelSize[cascade];
float voxelExtent = voxelSize * 0.5f;
float cascadeMinStep = voxelSize;
float3 worldPosition = trace.WorldPosition + trace.WorldDirection * (voxelSize * cascadeTraceStartBias);
// Hit the cascade bounds to find the intersection points
float2 intersections = LineHitBox(trace.WorldPosition, traceEndPosition, cascadePosDistance.xyz - cascadePosDistance.www, cascadePosDistance.xyz + cascadePosDistance.www);
float2 intersections = LineHitBox(worldPosition, traceEndPosition, cascadePosDistance.xyz - cascadePosDistance.www, cascadePosDistance.xyz + cascadePosDistance.www);
intersections.xy *= traceMaxDistance;
intersections.x = max(intersections.x, nextIntersectionStart);
float stepTime = intersections.x;
@@ -195,7 +196,7 @@ GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, T
LOOP
for (; step < 250 && stepTime < intersections.y; step++)
{
float3 stepPosition = trace.WorldPosition + trace.WorldDirection * stepTime;
float3 stepPosition = worldPosition + trace.WorldDirection * stepTime;
// Sample SDF
float cascadeMaxDistance;