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volumetric cloud reprojection: fallback to cloud map on disocclusion reduces noise

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Turánszki János
2026-02-14 08:39:03 +01:00
parent c22ae82bca
commit 6d1fdb84f5
1 changed files with 17 additions and 4 deletions
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WickedEngine/shaders/volumetricCloud_reprojectCS.hlsl
+17 -4
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@@ -19,6 +19,16 @@ static const float2 temporalResponseMinMax = float2(0.86, 0.96);
// When moving fast reprojection cannot catch up. This value eliminates the ghosting but results in clipping artefacts
//#define ADDITIONAL_BOX_CLAMP
// Fallback to non-reprojected but slower updated cloudmap on disocclusions to avoid noisiness:
void cloudmap_fallback(float depth, float3 V, inout float4 result)
{
if (depth == 0 && V.y > 0 && GetScene().texture_cloudmap >= 0)
{
float4 cloudmap = bindless_textures[descriptor_index(GetScene().texture_cloudmap)].SampleLevel(sampler_linear_clamp, encode_hemioct(V.xzy) * 0.5 + 0.5, 0);
result = cloudmap;
}
}
[numthreads(POSTPROCESS_BLOCKSIZE, POSTPROCESS_BLOCKSIZE, 1)]
void main(uint3 DTid : SV_DispatchThreadID)
{
@@ -80,6 +90,10 @@ void main(uint3 DTid : SV_DispatchThreadID)
float2 depthResult = 0.0;
float additionalResult = 0.0;
float depth = texture_depth.SampleLevel(sampler_point_clamp, uv, 1).r; // Half res
float3 depthWorldPosition = reconstruct_position(uv, depth);
float tToDepthBuffer = length(depthWorldPosition - GetCamera().position);
float3 V = normalize(depthWorldPosition - GetCamera().position);
#if 0 // Simple reprojection version
if (shouldUpdatePixel)
@@ -107,10 +121,6 @@ void main(uint3 DTid : SV_DispatchThreadID)
float4 previousResult = cloud_history.SampleLevel(sampler_linear_clamp, prevUV, 0);
float2 previousDepthResult = cloud_depth_history.SampleLevel(sampler_linear_clamp, prevUV, 0);
float previousAdditionalResult = cloud_additional_history.SampleLevel(sampler_linear_clamp, prevUV, 0);
float depth = texture_depth.SampleLevel(sampler_point_clamp, uv, 1).r; // Half res
float3 depthWorldPosition = reconstruct_position(uv, depth);
float tToDepthBuffer = length(depthWorldPosition - GetCamera().position);
// Fow now we use float values instead of half-float, we need to convert the cloud system to use kilometer unit and we can revert to half-float values
tToDepthBuffer = depth == 0.0 ? FLT_MAX : tToDepthBuffer;
@@ -122,6 +132,7 @@ void main(uint3 DTid : SV_DispatchThreadID)
result = newResult;
depthResult = newDepthResult;
additionalResult = temporalResponseMinMax.x;
cloudmap_fallback(depth, V, result);
}
else
{
@@ -192,6 +203,7 @@ void main(uint3 DTid : SV_DispatchThreadID)
result = neighborResult;
depthResult = neighboorDepthResult;
additionalResult = temporalResponseMinMax.x;
cloudmap_fallback(depth, V, result);
}
}
}
@@ -242,6 +254,7 @@ void main(uint3 DTid : SV_DispatchThreadID)
result = cloud_current.SampleLevel(sampler_linear_clamp, uv, 0);
depthResult = cloud_depth_current.SampleLevel(sampler_linear_clamp, uv, 0);
additionalResult = temporalResponseMinMax.x;
cloudmap_fallback(depth, V, result);
}
output[DTid.xy] = result;