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Improve probes relocation algorithm to reduce visual artifacts due to probes flickering

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This commit is contained in:
Wojciech Figat
2022-05-27 11:44:39 +02:00
parent 48b3a34182
commit eb6050cf27
3 changed files with 15 additions and 10 deletions
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14
Source/Shaders/GI/DDGI.hlsl
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@@ -97,16 +97,10 @@ float LoadDDGIProbeState(DDGIData data, Texture2D<float4> probesState, uint prob
// Loads probe world-space position (XYZ) and probe state (W)
float4 LoadDDGIProbePositionAndState(DDGIData data, Texture2D<float4> probesState, uint probeIndex, uint3 probeCoords)
{
float4 result;
result.xyz = GetDDGIProbeWorldPosition(data, probeCoords);
// Probe state contains relocation's offset and the classification's state
int2 probeDataCoords = GetDDGIProbeTexelCoords(data, probeIndex);
float4 probeState = probesState.Load(int3(probeDataCoords, 0));
result.xyz += probeState.xyz;
result.w = probeState.w;
return result;
probeState.xyz += GetDDGIProbeWorldPosition(data, probeCoords);
return probeState;
}
// Calculates texture UVs for sampling probes atlas texture (irradiance or distance)
@@ -193,6 +187,10 @@ float3 SampleDDGIIrradiance(DDGIData data, Texture2D<float4> probesState, Textur
probeIrradiance = pow(probeIrradiance, data.IrradianceGamma * 0.5f);
#endif
// Debug probe offset visualization
//float4 probeState = probesState.Load(int3(GetDDGIProbeTexelCoords(data, probeIndex), 0));
//probeIrradiance = float3(max(frac(probeState.xyz) * 2, 0.1f));
// Accumulate weighted irradiance
irradiance += float4(probeIrradiance * weight, weight);
}

10
Source/Shaders/GI/DDGI.shader
View File

@@ -90,8 +90,13 @@ void CS_Classify(uint3 DispatchThreadId : SV_DispatchThreadID)
{
if (abs(sdf) < relocateLimit)
{
// Relocate it
probeState.xyz = probeState.xyz + sdfNormal * (sdf + threshold);
float3 offsetToAdd = sdfNormal * (sdf + threshold);
if (distance(probeState.xyz, offsetToAdd) < relocateLimit)
{
// Relocate it
probeState.xyz = probeState.xyz + offsetToAdd;
}
// TODO: maybe sample SDF at the relocated location and disable probe if it's still in the geometry?
}
else
{
@@ -400,6 +405,7 @@ void CS_UpdateBorders(uint3 DispatchThreadId : SV_DispatchThreadID)
copyCoordinates = uint2(threadCoordinates.x - 1, probeStart + offset);
#endif
COPY_PIXEL;
#undef COPY_PIXEL
#undef COPY_PIXEL_DEBUG
}