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Refactor DDGI fallback radiance to use alpha for blending between fixed color and color at snapped location of the last cascade

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This means artists don't need to adjust the value anymore as it can cover vista geometry with GI at last cascade borders.
This commit is contained in:
Wojtek Figat
2026-01-05 16:22:00 +01:00
parent c5a28a5734
commit 11ea889fa9
6 changed files with 38 additions and 27 deletions
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3
Source/Engine/Renderer/GI/DynamicDiffuseGlobalIllumination.cpp
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@@ -328,7 +328,6 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
const float indirectLightingIntensity = settings.Intensity;
const float probeHistoryWeight = Math::Clamp(settings.TemporalResponse, 0.0f, 0.98f);
const float distance = settings.Distance;
const Color fallbackIrradiance = settings.FallbackIrradiance;
// Automatically calculate amount of cascades to cover the GI distance at the current probes spacing
const int32 idealProbesCount = 20; // Ideal amount of probes per-cascade to try to fit in order to cover whole distance
@@ -518,7 +517,7 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
ddgiData.Result.Constants.ProbeHistoryWeight = probeHistoryWeight;
ddgiData.Result.Constants.IrradianceGamma = 1.5f;
ddgiData.Result.Constants.IndirectLightingIntensity = indirectLightingIntensity;
ddgiData.Result.Constants.FallbackIrradiance = fallbackIrradiance.ToFloat3() * fallbackIrradiance.A;
ddgiData.Result.Constants.FallbackIrradiance = settings.FallbackIrradiance.ToFloat4();
ddgiData.Result.ProbesData = ddgiData.ProbesData->View();
ddgiData.Result.ProbesDistance = ddgiData.ProbesDistance->View();
ddgiData.Result.ProbesIrradiance = ddgiData.ProbesIrradiance->View();