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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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2
Source/Engine/Graphics/Materials/MaterialShaderFeatures.cpp
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@@ -191,7 +191,7 @@ bool GlobalIlluminationFeature::Bind(MaterialShader::BindParameters& params, Spa
{
// Unbind SRVs to prevent issues
data.DDGI.CascadesCount = 0;
data.DDGI.FallbackIrradiance = Float3::Zero;
data.DDGI.FallbackIrradiance = Float4::Zero;
params.GPUContext->UnBindSR(srv + 0);
params.GPUContext->UnBindSR(srv + 1);
params.GPUContext->UnBindSR(srv + 2);

2
Source/Engine/Graphics/PostProcessSettings.h
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@@ -378,7 +378,7 @@ API_STRUCT() struct FLAXENGINE_API GlobalIlluminationSettings : ISerializable
/// The irradiance lighting outside the GI range used as a fallback to prevent pure-black scene outside the Global Illumination range.
/// </summary>
API_FIELD(Attributes="EditorOrder(40), PostProcessSetting((int)GlobalIlluminationSettingsOverride.FallbackIrradiance)")
Color FallbackIrradiance = Color::Black;
Color FallbackIrradiance = Color::Transparent;
public:
/// <summary>

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();

3
Source/Engine/Renderer/GI/DynamicDiffuseGlobalIllumination.h
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@@ -25,8 +25,7 @@ public:
float IndirectLightingIntensity;
Float3 ViewPos;
uint32 RaysCount;
Float3 FallbackIrradiance;
float Padding0;
Float4 FallbackIrradiance;
});
// Binding data for the GPU.