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Fix blending between DDGI cascades on the end of the range

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Wojtek Figat
2024-07-24 12:21:50 +02:00
parent 6f3d1cdd0a
commit e9144ff834
1 changed files with 13 additions and 3 deletions
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16
Source/Shaders/GI/DDGI.hlsl
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@@ -322,9 +322,10 @@ float3 SampleDDGIIrradiance(DDGIData data, Texture2D<snorm float4> probesData, T
// Sample cascade
float3 result = SampleDDGIIrradianceCascade(data, probesData, probesDistance, probesIrradiance, worldPosition, worldNormal, cascadeIndex, probesOrigin, probesExtent, probesSpacing, biasedWorldPosition);
#if DDGI_CASCADE_BLEND_SMOOTH
// Blend with the next cascade
// Blend with the next cascade (or fallback irradiance outside the volume)
cascadeIndex++;
#if DDGI_CASCADE_BLEND_SMOOTH
result *= cascadeWeight;
if (cascadeIndex < data.CascadesCount && cascadeWeight < 0.99f)
{
probesSpacing = data.ProbesOriginAndSpacing[cascadeIndex].w;
@@ -332,7 +333,16 @@ float3 SampleDDGIIrradiance(DDGIData data, Texture2D<snorm float4> probesData, T
probesExtent = (data.ProbesCounts - 1) * (probesSpacing * 0.5f);
biasedWorldPosition = worldPosition + GetDDGISurfaceBias(viewDir, probesSpacing, worldNormal, bias);
float3 resultNext = SampleDDGIIrradianceCascade(data, probesData, probesDistance, probesIrradiance, worldPosition, worldNormal, cascadeIndex, probesOrigin, probesExtent, probesSpacing, biasedWorldPosition);
result = lerp(resultNext, result, cascadeWeight);
result += resultNext * (1 - cascadeWeight);
}
else
{
result += data.FallbackIrradiance * (1 - cascadeWeight);
}
#else
if (cascadeIndex == data.CascadesCount)
{
result += data.FallbackIrradiance * (1 - cascadeWeight);
}
#endif