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Add improved Global SDF tracing when going over different cascades

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This commit is contained in:
Wojtek Figat
2024-06-04 10:47:37 +02:00
parent 3c5d2f8b47
commit abdbd1ee64
1 changed files with 6 additions and 7 deletions
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13
Source/Shaders/GlobalSignDistanceField.hlsl
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@@ -223,26 +223,25 @@ GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, T
float4 cascadePosDistance = data.CascadePosDistance[cascade];
float voxelSize = data.CascadeVoxelSize[cascade];
float voxelExtent = voxelSize * 0.5f;
float3 worldPosition = trace.WorldPosition + trace.WorldDirection * (voxelSize * cascadeTraceStartBias);
float3 worldPosition = trace.WorldPosition + trace.WorldDirection * max(voxelSize * cascadeTraceStartBias, trace.MinDistance);
// Hit the cascade bounds to find the intersection points
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;
if (intersections.x >= intersections.y)
{
// Skip the current cascade if the ray starts outside it
stepTime = intersections.y;
continue;
}
else
{
// Skip the current cascade tracing on the next cascade
// Skip the current cascade tracing on the next cascade (if we're tracing from inside SDF volume)
if (intersections.x <= 0.0f)
nextIntersectionStart = intersections.y;
}
// Walk over the cascade SDF
uint step = 0;
float stepTime = intersections.x;
LOOP
for (; step < 250 && stepTime < intersections.y; step++)
{