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Fix DDGI flickering on floors aligned to world axes

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Apply a small bias to sample location and dither it a bit to smooth out.
This commit is contained in:
Wojtek Figat
2026-01-05 17:19:16 +01:00
parent 11ea889fa9
commit cf3bcc4549
2 changed files with 2 additions and 2 deletions
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1
Source/Engine/Renderer/GI/DynamicDiffuseGlobalIllumination.cpp
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@@ -376,7 +376,6 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
blendOrigins[cascadeIndex] = viewOrigin;
const float viewOriginSnapping = cascadeProbesSpacing;
viewOrigin = Float3::Floor(viewOrigin / viewOriginSnapping) * viewOriginSnapping;
viewOrigin -= UNITS_TO_METERS(0.5f); // Bias to avoid precision issues (eg. if floor mesh is exactly at Y=0)
viewOrigins[cascadeIndex] = viewOrigin;
}

3
Source/Shaders/GI/DDGI.shader
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@@ -913,7 +913,8 @@ void PS_IndirectLighting(Quad_VS2PS input, out float4 output : SV_Target0)
// Sample irradiance
float dither = RandN2(input.TexCoord + TemporalTime).x;
float3 irradiance = SampleDDGIIrradiance(DDGI, ProbesData, ProbesDistance, ProbesIrradiance, gBuffer.WorldPos, gBuffer.Normal, DDGI_DEFAULT_BIAS, dither);
float3 samplePos = gBuffer.WorldPos + gBuffer.Normal * (dither * 0.1f + 0.1f);
float3 irradiance = SampleDDGIIrradiance(DDGI, ProbesData, ProbesDistance, ProbesIrradiance, samplePos, gBuffer.Normal, DDGI_DEFAULT_BIAS, dither);
// Calculate lighting
float3 diffuseColor = GetDiffuseColor(gBuffer);