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Fix DDGI cascades blending to be smoother

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This commit is contained in:
Wojtek Figat
2026-01-03 00:48:36 +01:00
parent 400e2f1b0e
commit b24d98df9e
5 changed files with 22 additions and 13 deletions
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2
Source/Engine/Graphics/Materials/MaterialShader.h
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@@ -10,7 +10,7 @@
/// <summary>
/// Current materials shader version.
/// </summary>
#define MATERIAL_GRAPH_VERSION 178
#define MATERIAL_GRAPH_VERSION 179
class Material;
class GPUShader;

7
Source/Engine/Renderer/GI/DynamicDiffuseGlobalIllumination.cpp
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@@ -338,7 +338,7 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
}
// Calculate the probes count based on the amount of cascades and the distance to cover
const float cascadesDistanceScales[] = { 1.0f, 3.0f, 6.0f, 10.0f }; // Scales each cascade further away from the camera origin
const float cascadesDistanceScales[] = { 1.0f, 3.0f, 5.0f, 10.0f }; // Scales each cascade further away from the camera origin
const float distanceExtent = distance / cascadesDistanceScales[cascadesCount - 1];
const float verticalRangeScale = 0.8f; // Scales the probes volume size at Y axis (horizontal aspect ratio makes the DDGI use less probes vertically to cover whole screen)
Int3 probesCounts(Float3::Ceil(Float3(distanceExtent, distanceExtent * verticalRangeScale, distanceExtent) / probesSpacing));
@@ -354,6 +354,7 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
// Initialize cascades
float probesSpacings[4];
Float3 viewOrigins[4];
Float3 blendOrigins[4];
for (int32 cascadeIndex = 0; cascadeIndex < cascadesCount; cascadeIndex++)
{
// Each cascade has higher spacing between probes
@@ -369,9 +370,10 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
const Float3 viewRayHit = CollisionsHelper::LineHitsBox(viewOrigin, viewOrigin + viewDirection * (probesDistanceMax * 2.0f), viewOrigin - probesDistance, viewOrigin + probesDistance);
const float viewOriginOffset = viewRayHit.Y * probesDistanceMax * 0.4f;
viewOrigin += viewDirection * viewOriginOffset;
//viewOrigin = Float3::Zero;
blendOrigins[cascadeIndex] = viewOrigin;
const float viewOriginSnapping = cascadeProbesSpacing;
viewOrigin = Float3::Floor(viewOrigin / viewOriginSnapping) * viewOriginSnapping;
//viewOrigin = Float3::Zero;
viewOrigin -= UNITS_TO_METERS(0.5f); // Bias to avoid precision issues (eg. if floor mesh is exactly at Y=0)
viewOrigins[cascadeIndex] = viewOrigin;
}
@@ -504,6 +506,7 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
{
auto& cascade = ddgiData.Cascades[cascadeIndex];
ddgiData.Result.Constants.ProbesOriginAndSpacing[cascadeIndex] = Float4(cascade.ProbesOrigin, cascade.ProbesSpacing);
ddgiData.Result.Constants.BlendOrigin[cascadeIndex] = Float4(blendOrigins[cascadeIndex], 0.0f);
ddgiData.Result.Constants.ProbesScrollOffsets[cascadeIndex] = Int4(cascade.ProbeScrollOffsets, 0);
}
ddgiData.Result.Constants.RayMaxDistance = distance;

3
Source/Engine/Renderer/GI/DynamicDiffuseGlobalIllumination.h
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@@ -15,7 +15,8 @@ public:
// Constant buffer data for DDGI access on a GPU.
GPU_CB_STRUCT(ConstantsData {
Float4 ProbesOriginAndSpacing[4];
Int4 ProbesScrollOffsets[4];
Float4 BlendOrigin[4]; // w is unused
Int4 ProbesScrollOffsets[4]; // w is unused
uint32 ProbesCounts[3];
uint32 CascadesCount;
float IrradianceGamma;