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Improve DDGI quality

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This commit is contained in:
Wojciech Figat
2022-06-24 16:17:32 +02:00
parent a7b31fbf9b
commit 282b9066b8
6 changed files with 13 additions and 11 deletions
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12
Source/Shaders/GI/DDGI.hlsl
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@@ -32,7 +32,7 @@ struct DDGIData
float RayMaxDistance;
float IndirectLightingIntensity;
float4 RaysRotation;
float3 ViewDir;
float3 ViewPos;
uint RaysCount;
float3 FallbackIrradiance;
float Padding0;
@@ -120,8 +120,9 @@ float2 GetDDGIProbeUV(DDGIData data, uint cascadeIndex, uint probeIndex, float2
}
// Samples DDGI probes volume at the given world-space position and returns the irradiance.
// rand - randomized per-pixel value in range 0-1, used to smooth dithering for cascades blending
float3 SampleDDGIIrradiance(DDGIData data, Texture2D<snorm float4> probesState, Texture2D<float4> probesDistance, Texture2D<float4> probesIrradiance, float3 worldPosition, float3 worldNormal, float bias, float dither = 0.0f)
// bias - scales the bias vector to the initial sample point to reduce self-shading artifacts
// dither - randomized per-pixel value in range 0-1, used to smooth dithering for cascades blending
float3 SampleDDGIIrradiance(DDGIData data, Texture2D<snorm float4> probesState, Texture2D<float4> probesDistance, Texture2D<float4> probesIrradiance, float3 worldPosition, float3 worldNormal, float bias = 0.2f, float dither = 0.0f)
{
// Select the highest cascade that contains the sample location
uint cascadeIndex = 0;
@@ -163,7 +164,8 @@ float3 SampleDDGIIrradiance(DDGIData data, Texture2D<snorm float4> probesState,
float3 probesExtent = (data.ProbesCounts - 1) * (probesSpacing * 0.5f);
// Bias the world-space position to reduce artifacts
float3 surfaceBias = (worldNormal * bias) + (data.ViewDir * (bias * -4.0f));
float3 viewDir = normalize(data.ViewPos - worldPosition);
float3 surfaceBias = (worldNormal * 0.2f + viewDir * 0.8f) * (0.75f * probesSpacing * bias);
float3 biasedWorldPosition = worldPosition + surfaceBias;
// Get the grid coordinates of the probe nearest the biased world position
@@ -190,7 +192,7 @@ float3 SampleDDGIIrradiance(DDGIData data, Texture2D<snorm float4> probesState,
// Calculate the distance and direction from the (biased and non-biased) shading point and the probe
float3 worldPosToProbe = normalize(probePosition - worldPosition);
float3 biasedPosToProbe = normalize(probePosition - biasedWorldPosition);
float biasedPosToProbeDist = length(probePosition - biasedWorldPosition);
float biasedPosToProbeDist = length(probePosition - biasedWorldPosition) * 0.95f;
// Smooth backface test
float weight = Square(dot(worldPosToProbe, worldNormal) * 0.5f + 0.5f);