From 7a1ecd1f4b6e6a0a2b8ed418bcb60d6a645722d6 Mon Sep 17 00:00:00 2001
From: Anis Benyoub <anis@unity3d.com>
Date: Tue, 7 Sep 2021 11:17:09 +0200
Subject: [PATCH 01/10] Fixed regression in the ambient probe intensity for
 volumetric clouds.

---
 com.unity.render-pipelines.high-definition/CHANGELOG.md       | 1 +
 .../VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs   | 3 +++
 .../HDRenderPipeline.VolumetricCloudsLighting.cs              | 4 +++-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index 826a0431c39..4d38b19f942 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed light anchor min distance value + properties not working with prefabs (case 1345509).
 - Fixed specular occlusion sharpness and over darkening at grazing angles.
 - Fixed edge bleeding when rendering volumetric clouds.
+- Fixed regression in the ambient probe intensity for volumetric clouds.
 
 ### changed
 - Visual Environment ambient mode is now Dynamic by default.
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
index 73f366b80f3..aa025ae5a99 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
@@ -7,6 +7,7 @@ public partial class HDRenderPipeline
     {
         // Intermediate values for ambient probe evaluation
         Vector4[] m_PackedCoeffsClouds;
+        ZonalHarmonicsL2 m_PhaseZHClouds;
 
         // Cloud preset maps
         Texture2D m_SparsePresetMap;
@@ -89,6 +90,8 @@ void InitializeVolumetricClouds()
 
             // Allocate the buffers for ambient probe evaluation
             m_PackedCoeffsClouds = new Vector4[7];
+            m_PhaseZHClouds = new ZonalHarmonicsL2();
+            m_PhaseZHClouds.coeffs = new float[3];
 
             // Grab the kernels we need
             ComputeShader volumetricCloudsCS = m_Asset.renderPipelineResources.shaders.volumetricCloudsCS;
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsLighting.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsLighting.cs
index fa8f41197bb..edcb47517d3 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsLighting.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsLighting.cs
@@ -92,7 +92,9 @@ unsafe void SetPreconvolvedAmbientLightProbe(ref ShaderVariablesClouds cb, Volum
             {
                 SphericalHarmonicsL2 probeSH = SphericalHarmonicMath.UndoCosineRescaling(m_CloudsAmbientProbe);
                 probeSH = SphericalHarmonicMath.RescaleCoefficients(probeSH, settings.ambientLightProbeDimmer.value);
-                SphericalHarmonicMath.PackCoefficients(m_PackedCoeffsClouds, probeSH);
+                ZonalHarmonicsL2.GetCornetteShanksPhaseFunction(m_PhaseZHClouds, 0.0f);
+                SphericalHarmonicsL2 finalSH = SphericalHarmonicMath.PremultiplyCoefficients(SphericalHarmonicMath.Convolve(probeSH, m_PhaseZHClouds));
+                SphericalHarmonicMath.PackCoefficients(m_PackedCoeffsClouds, finalSH);
 
                 // Evaluate the probe at the top and bottom (above and under the clouds)
                 cb._AmbientProbeTop = EvaluateAmbientProbe(Vector3.down);

From eaeb9493fccfeb9bf9b6e18bb0fb698057ceb473 Mon Sep 17 00:00:00 2001
From: anisunity <anis@unity3d.com>
Date: Wed, 8 Sep 2021 16:28:19 +0200
Subject: [PATCH 02/10] Fix artifact non local low clouds

---
 .../HDRenderPipeline.VolumetricClouds.cs                  | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
index aa025ae5a99..7b4fa8801b1 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
@@ -375,7 +375,13 @@ void UpdateShaderVariableslClouds(ref ShaderVariablesClouds cb, HDCamera hdCamer
         {
             // Convert to kilometers
             cb._LowestCloudAltitude = settings.lowestCloudAltitude.value;
-            cb._HighestCloudAltitude = settings.lowestCloudAltitude.value + settings.cloudThickness.value;
+
+            // When in non local mode, the camera is supposed to be always stricly under the clouds
+            // to avoid artifactss due to precision issues, when in non local, the clouds are always 1 meter above the camera.
+            if (!settings.localClouds.value)
+                cb._LowestCloudAltitude = Mathf.Max(cb._LowestCloudAltitude, 1.0f);
+
+            cb._HighestCloudAltitude = cb._LowestCloudAltitude + settings.cloudThickness.value;
             cb._EarthRadius = Mathf.Lerp(1.0f, 0.025f, settings.earthCurvature.value) * k_EarthRadius;
             cb._CloudRangeSquared.Set(Square(cb._LowestCloudAltitude + cb._EarthRadius), Square(cb._HighestCloudAltitude + cb._EarthRadius));
 

From 8327da6830d3cafe3f693c8d5a0232bb47aa9c73 Mon Sep 17 00:00:00 2001
From: Anis Benyoub <anis@unity3d.com>
Date: Wed, 8 Sep 2021 18:42:55 +0200
Subject: [PATCH 03/10] Fixed the sun leaking from behind fully opaque clouds.
 Changed the volumetric clouds presets.

---
 .../CHANGELOG.md                              |  4 +-
 .../BilateralUpsample.hlsl                    |  2 +-
 .../HDRenderPipeline.VolumetricClouds.cs      | 52 +++++++++----------
 .../VolumetricClouds/CloudLutRainAO.png       |  4 +-
 4 files changed, 32 insertions(+), 30 deletions(-)

diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index 4d38b19f942..4be845441ff 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -15,9 +15,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed specular occlusion sharpness and over darkening at grazing angles.
 - Fixed edge bleeding when rendering volumetric clouds.
 - Fixed regression in the ambient probe intensity for volumetric clouds.
+- Fixed the sun leaking from behind fully opaque clouds.
 
-### changed
+### Changed
 - Visual Environment ambient mode is now Dynamic by default.
+- Changed the volumetric clouds presets.
 
 ## [12.0.0] - 2021-01-11
 
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/ScreenSpaceLighting/BilateralUpsample.hlsl b/com.unity.render-pipelines.high-definition/Runtime/Lighting/ScreenSpaceLighting/BilateralUpsample.hlsl
index 5969696ffe7..eee568c1e65 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/ScreenSpaceLighting/BilateralUpsample.hlsl
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/ScreenSpaceLighting/BilateralUpsample.hlsl
@@ -170,6 +170,6 @@ float4 BilUpColor3x3(float highDepth, in NeighborhoodUpsampleData3x3 data)
                         + data.lowValue6 * combinedWeightsB.z
                         + data.lowValue7 * combinedWeightsB.w
                         + data.lowValue8 * combinedWeightsC
-                        + _NoiseFilterStrength;
+                        +  float4(_NoiseFilterStrength, _NoiseFilterStrength, _NoiseFilterStrength, 0.0);
     return WeightedSum / TotalWeight;
 }
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
index 7b4fa8801b1..32c75765b46 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
@@ -145,15 +145,15 @@ void AllocatePresetTextures()
             m_SparsePresetMap.Apply();
 
             m_CloudyPresetMap = new Texture2D(1, 1, GraphicsFormat.R8G8B8A8_UNorm, TextureCreationFlags.None) { name = "Default Cloudy Texture" };
-            m_CloudyPresetMap.SetPixel(0, 0, new Color(0.9f, 0.0f, 0.2f, 1.0f));
+            m_CloudyPresetMap.SetPixel(0, 0, new Color(0.9f, 0.0f, 0.25f, 1.0f));
             m_CloudyPresetMap.Apply();
 
             m_OvercastPresetMap = new Texture2D(1, 1, GraphicsFormat.R8G8B8A8_UNorm, TextureCreationFlags.None) { name = "Default Overcast Texture" };
-            m_OvercastPresetMap.SetPixel(0, 0, new Color(0.5f, 0.0f, 1.0f, 1.0f));
+            m_OvercastPresetMap.SetPixel(0, 0, new Color(0.9f, 0.0f, 0.25f, 1.0f));
             m_OvercastPresetMap.Apply();
 
             m_StormyPresetMap = new Texture2D(1, 1, GraphicsFormat.R8G8B8A8_UNorm, TextureCreationFlags.None) { name = "Default Storm Texture" };
-            m_StormyPresetMap.SetPixel(0, 0, new Color(1.0f, 0.0f, 0.80f, 1.0f));
+            m_StormyPresetMap.SetPixel(0, 0, new Color(1.0f, 0.0f, 0.85f, 1.0f));
             m_StormyPresetMap.Apply();
         }
 
@@ -173,52 +173,52 @@ void GetPresetCloudMapValues(VolumetricClouds.CloudPresets preset, out CloudMode
             {
                 case VolumetricClouds.CloudPresets.Sparse:
                 {
-                    cloudModelData.densityMultiplier = 0.2f;
+                    cloudModelData.densityMultiplier = 0.3f;
                     cloudModelData.shapeFactor = 0.9f;
-                    cloudModelData.shapeScale = 2.0f;
-                    cloudModelData.erosionFactor = 0.6f;
-                    cloudModelData.erosionScale = 50.0f;
+                    cloudModelData.shapeScale = 3.0f;
+                    cloudModelData.erosionFactor = 0.9f;
+                    cloudModelData.erosionScale = 75.0f;
                     cloudModelData.erosionNoise = VolumetricClouds.CloudErosionNoise.Perlin32;
                     return;
                 }
                 case VolumetricClouds.CloudPresets.Cloudy:
                 {
-                    cloudModelData.densityMultiplier = 0.3f;
-                    cloudModelData.shapeFactor = 0.85f;
-                    cloudModelData.shapeScale = 2.5f;
-                    cloudModelData.erosionFactor = 0.7f;
-                    cloudModelData.erosionScale = 55.0f;
+                    cloudModelData.densityMultiplier = 0.35f;
+                    cloudModelData.shapeFactor = 0.9f;
+                    cloudModelData.shapeScale = 5.0f;
+                    cloudModelData.erosionFactor = 0.9f;
+                    cloudModelData.erosionScale = 120.0f;
                     cloudModelData.erosionNoise = VolumetricClouds.CloudErosionNoise.Perlin32;
                     return;
                 }
                 case VolumetricClouds.CloudPresets.Overcast:
                 {
                     cloudModelData.densityMultiplier = 0.25f;
-                    cloudModelData.shapeFactor = 0.5f;
-                    cloudModelData.shapeScale = 6.0f;
-                    cloudModelData.erosionFactor = 0.5f;
-                    cloudModelData.erosionScale = 40.0f;
+                    cloudModelData.shapeFactor = 0.55f;
+                    cloudModelData.shapeScale = 8.0f; 
+                    cloudModelData.erosionFactor = 0.6f;
+                    cloudModelData.erosionScale = 80.0f;
                     cloudModelData.erosionNoise = VolumetricClouds.CloudErosionNoise.Perlin32;
                     return;
                 }
                 case VolumetricClouds.CloudPresets.Stormy:
                 {
-                    cloudModelData.densityMultiplier = 0.3f;
-                    cloudModelData.shapeFactor = 0.9f;
-                    cloudModelData.shapeScale = 2.0f;
-                    cloudModelData.erosionFactor = 0.8f;
-                    cloudModelData.erosionScale = 50.0f;
+                    cloudModelData.densityMultiplier = 0.35f;
+                    cloudModelData.shapeFactor = 0.85f;
+                    cloudModelData.shapeScale = 3.5f; 
+                    cloudModelData.erosionFactor = 0.95f;
+                    cloudModelData.erosionScale = 70.0f;
                     cloudModelData.erosionNoise = VolumetricClouds.CloudErosionNoise.Perlin32;
                     return;
                 }
             }
 
             // Default unused values
-            cloudModelData.densityMultiplier = 0.38729833462f;
-            cloudModelData.shapeFactor = 0.6f;
-            cloudModelData.shapeScale = 0.33333333333f;
-            cloudModelData.erosionFactor = 0.6f;
-            cloudModelData.erosionScale = 0.33333333333f;
+            cloudModelData.densityMultiplier = 0.0f;
+            cloudModelData.shapeFactor = 0.0f;
+            cloudModelData.shapeScale = 0.0f;
+            cloudModelData.erosionFactor = 0.0f;
+            cloudModelData.erosionScale = 0.0f;
             cloudModelData.erosionNoise = VolumetricClouds.CloudErosionNoise.Perlin32;
         }
 
diff --git a/com.unity.render-pipelines.high-definition/Runtime/RenderPipelineResources/Texture/VolumetricClouds/CloudLutRainAO.png b/com.unity.render-pipelines.high-definition/Runtime/RenderPipelineResources/Texture/VolumetricClouds/CloudLutRainAO.png
index 50c0121c8ad..3cfb0125353 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/RenderPipelineResources/Texture/VolumetricClouds/CloudLutRainAO.png
+++ b/com.unity.render-pipelines.high-definition/Runtime/RenderPipelineResources/Texture/VolumetricClouds/CloudLutRainAO.png
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:e65f46c930edffe9abffdd9483803384170e62fe240caa67759fb7d6ddb3d4d6
-size 9171
+oid sha256:97c41e20e707f1fbfc6862e1b891e8808ebf3aea100d3f314e8a558e7d10a08d
+size 7061

From 50750733c8ee72e793934a10f7081856f9ed746c Mon Sep 17 00:00:00 2001
From: Anis Benyoub <anis@unity3d.com>
Date: Wed, 8 Sep 2021 19:06:27 +0200
Subject: [PATCH 04/10] fix formatting

---
 .../VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs   | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
index 32c75765b46..89ee25d1853 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
@@ -195,7 +195,7 @@ void GetPresetCloudMapValues(VolumetricClouds.CloudPresets preset, out CloudMode
                 {
                     cloudModelData.densityMultiplier = 0.25f;
                     cloudModelData.shapeFactor = 0.55f;
-                    cloudModelData.shapeScale = 8.0f; 
+                    cloudModelData.shapeScale = 8.0f;
                     cloudModelData.erosionFactor = 0.6f;
                     cloudModelData.erosionScale = 80.0f;
                     cloudModelData.erosionNoise = VolumetricClouds.CloudErosionNoise.Perlin32;
@@ -205,7 +205,7 @@ void GetPresetCloudMapValues(VolumetricClouds.CloudPresets preset, out CloudMode
                 {
                     cloudModelData.densityMultiplier = 0.35f;
                     cloudModelData.shapeFactor = 0.85f;
-                    cloudModelData.shapeScale = 3.5f; 
+                    cloudModelData.shapeScale = 3.5f;
                     cloudModelData.erosionFactor = 0.95f;
                     cloudModelData.erosionScale = 70.0f;
                     cloudModelData.erosionNoise = VolumetricClouds.CloudErosionNoise.Perlin32;

From 1985d1145c5b17b0f46f8cfec0601a3d787c5076 Mon Sep 17 00:00:00 2001
From: Anis Benyoub <anis@unity3d.com>
Date: Wed, 8 Sep 2021 19:13:12 +0200
Subject: [PATCH 05/10] Added an option for the ultra 1024x1024 mode for the
 volumetric cloud shadows and a filtering pass to reduce the aliasing
 artifacts of the clouds shadow. Changed the number of steps to evaluate the
 shadow from 9 to 16.

---
 .../CHANGELOG.md                              |  4 ++
 ...DRenderPipeline.VolumetricCloudsShadows.cs | 37 ++++++++--
 .../VolumetricClouds.compute                  | 72 ++++++++++++++++++-
 .../VolumetricLighting/VolumetricClouds.cs    |  4 +-
 .../RenderPipeline/HDStringConstants.cs       |  1 +
 5 files changed, 109 insertions(+), 9 deletions(-)

diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index 4be845441ff..b2e8ed075a6 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -20,6 +20,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Changed
 - Visual Environment ambient mode is now Dynamic by default.
 - Changed the volumetric clouds presets.
+- Changed the number of steps to evaluate the shadow from 9 to 16.
+
+### Added
+- Added an option for the ultra 1024x1024 mode for the volumetric cloud shadows and a filtering pass to reduce the aliasing artifacts of the clouds shadow.
 
 ## [12.0.0] - 2021-01-11
 
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsShadows.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsShadows.cs
index ecd67027d88..521dbf64dc7 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsShadows.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsShadows.cs
@@ -7,23 +7,25 @@ public partial class HDRenderPipeline
     {
         // Cloud preset maps
         RTHandle[] m_VolumetricCloudsShadowTexture = new RTHandle[VolumetricClouds.CloudShadowResolutionCount];
+        RTHandle m_VolumetricCloudsIntermediateShadowTexture;
 
         // The set of kernels that are required
         int m_ComputeShadowCloudsKernel;
+        int m_FilterShadowCloudsKernel;
 
         void InitializeVolumetricCloudsShadows()
         {
             // Grab the kernels we need
             ComputeShader volumetricCloudsCS = m_Asset.renderPipelineResources.shaders.volumetricCloudsCS;
             m_ComputeShadowCloudsKernel = volumetricCloudsCS.FindKernel("ComputeVolumetricCloudsShadow");
+            m_FilterShadowCloudsKernel = volumetricCloudsCS.FindKernel("FilterVolumetricCloudsShadow");
         }
 
         void ReleaseVolumetricCloudsShadows()
         {
             for (int i = 0; i < VolumetricClouds.CloudShadowResolutionCount; ++i)
-            {
                 RTHandles.Release(m_VolumetricCloudsShadowTexture[i]);
-            }
+            RTHandles.Release(m_VolumetricCloudsIntermediateShadowTexture);
         }
 
         bool HasVolumetricCloudsShadows(HDCamera hdCamera, in VolumetricClouds settings)
@@ -55,6 +57,7 @@ struct VolumetricCloudsShadowsParameters
             // Data common to all volumetric cloud passes
             public VolumetricCloudCommonData commonData;
             public int shadowsKernel;
+            public int filterShadowsKernel;
         }
 
         VolumetricCloudsShadowsParameters PrepareVolumetricCloudsShadowsParameters(HDCamera hdCamera, VolumetricClouds settings)
@@ -68,6 +71,7 @@ VolumetricCloudsShadowsParameters PrepareVolumetricCloudsShadowsParameters(HDCam
             FillVolumetricCloudsCommonData(false, settings, TVolumetricCloudsCameraType.Default, in cloudModelData, ref parameters.commonData);
 
             parameters.shadowsKernel = m_ComputeShadowCloudsKernel;
+            parameters.filterShadowsKernel = m_FilterShadowCloudsKernel;
 
             // Update the constant buffer
             VolumetricCloudsCameraData cameraData;
@@ -87,7 +91,7 @@ VolumetricCloudsShadowsParameters PrepareVolumetricCloudsShadowsParameters(HDCam
             return parameters;
         }
 
-        static void TraceVolumetricCloudShadow(CommandBuffer cmd, VolumetricCloudsShadowsParameters parameters, RTHandle shadowTexture)
+        static void TraceVolumetricCloudShadow(CommandBuffer cmd, VolumetricCloudsShadowsParameters parameters, RTHandle intermediateTexture, RTHandle shadowTexture)
         {
             using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.VolumetricCloudsShadow)))
             {
@@ -111,6 +115,17 @@ static void TraceVolumetricCloudShadow(CommandBuffer cmd, VolumetricCloudsShadow
                 // Evaluate the shadow
                 cmd.DispatchCompute(parameters.commonData.volumetricCloudsCS, parameters.shadowsKernel, shadowTX, shadowTY, 1);
 
+                // Given the low number of steps available and the absence of noise in the integration, we try to reduce the artifacts by doing two consecutive 3x3 blur passes.
+                // Filter the shadow
+                cmd.SetComputeTextureParam(parameters.commonData.volumetricCloudsCS, parameters.filterShadowsKernel, HDShaderIDs._VolumetricCloudsShadow, shadowTexture);
+                cmd.SetComputeTextureParam(parameters.commonData.volumetricCloudsCS, parameters.filterShadowsKernel, HDShaderIDs._VolumetricCloudsShadowRW, intermediateTexture);
+                cmd.DispatchCompute(parameters.commonData.volumetricCloudsCS, parameters.filterShadowsKernel, shadowTX, shadowTY, 1);
+
+                // Filter the shadow
+                cmd.SetComputeTextureParam(parameters.commonData.volumetricCloudsCS, parameters.filterShadowsKernel, HDShaderIDs._VolumetricCloudsShadow, intermediateTexture);
+                cmd.SetComputeTextureParam(parameters.commonData.volumetricCloudsCS, parameters.filterShadowsKernel, HDShaderIDs._VolumetricCloudsShadowRW, shadowTexture);
+                cmd.DispatchCompute(parameters.commonData.volumetricCloudsCS, parameters.filterShadowsKernel, shadowTX, shadowTY, 1);
+
                 // Bump the texture version
                 shadowTexture.rt.IncrementUpdateCount();
             }
@@ -146,12 +161,15 @@ RTHandle RequestVolumetricCloudsShadowTexture(in VolumetricClouds settings)
                 case VolumetricClouds.CloudShadowResolution.High512:
                     shadowResIndex = 3;
                     break;
+                case VolumetricClouds.CloudShadowResolution.Ultra1024:
+                    shadowResIndex = 4;
+                    break;
             }
 
             if (m_VolumetricCloudsShadowTexture[shadowResIndex] == null)
             {
                 m_VolumetricCloudsShadowTexture[shadowResIndex] = RTHandles.Alloc(shadowResolution, shadowResolution, 1, colorFormat: GraphicsFormat.B10G11R11_UFloatPack32,
-                    enableRandomWrite: true, useDynamicScale: false, useMipMap: false, wrapMode: TextureWrapMode.Clamp, name: "Volumetric Clouds Shadow Texture");
+                    enableRandomWrite: true, useDynamicScale: false, useMipMap: false, filterMode: FilterMode.Bilinear, wrapMode: TextureWrapMode.Clamp, name: "Volumetric Clouds Shadow Texture");
             }
 
             return m_VolumetricCloudsShadowTexture[shadowResIndex];
@@ -169,9 +187,18 @@ CookieParameters RenderVolumetricCloudsShadows(CommandBuffer cmd, HDCamera hdCam
             // TODO: Right now we can end up with a bunch of textures allocated which should be solved by an other PR.
             RTHandle currentHandle = RequestVolumetricCloudsShadowTexture(settings);
 
+            // Check if the intermediate texture that we need for the filtering has already been allocated
+            if (m_VolumetricCloudsIntermediateShadowTexture == null)
+            {
+                m_VolumetricCloudsIntermediateShadowTexture = RTHandles.Alloc((int)VolumetricClouds.CloudShadowResolution.Ultra1024, (int)VolumetricClouds.CloudShadowResolution.Ultra1024,
+                        1, colorFormat: GraphicsFormat.B10G11R11_UFloatPack32,
+                        enableRandomWrite: true, useDynamicScale: false, useMipMap: false,
+                        wrapMode: TextureWrapMode.Clamp, name: "Intermediate Volumetric Clouds Shadow Texture");
+            }
+
             // Evaluate and return the shadow
             var parameters = PrepareVolumetricCloudsShadowsParameters(hdCamera, settings);
-            TraceVolumetricCloudShadow(cmd, parameters, currentHandle);
+            TraceVolumetricCloudShadow(cmd, parameters, m_VolumetricCloudsIntermediateShadowTexture, currentHandle);
 
             // Grab the current sun light
             Light sunLight = GetMainLight();
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.compute b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.compute
index a61d4eeb013..cad84b01da9 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.compute
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.compute
@@ -23,6 +23,7 @@
 
 // Shadows
 #pragma kernel ComputeVolumetricCloudsShadow
+#pragma kernel FilterVolumetricCloudsShadow
 
 #pragma multi_compile _ PHYSICALLY_BASED_SUN
 #pragma multi_compile _ LOCAL_VOLUMETRIC_CLOUDS
@@ -1547,9 +1548,9 @@ void ComputeVolumetricCloudsShadow(uint3 currentCoords : SV_DispatchThreadID, ui
         float startDistance = intersectionO.x;
         float totalDistance = intersectionI.x - intersectionO.x;
 
-        float stepSize = totalDistance / 10;
+        float stepSize = totalDistance / 16;
 
-        for (int i = 1; i <= 8; ++i)
+        for (int i = 0; i < 16; ++i)
         {
             // Compute the sphere intersection position
             float3 positionWS = rayOriginWS + rayDirection * (intersectionO.x + stepSize * i);
@@ -1564,7 +1565,7 @@ void ComputeVolumetricCloudsShadow(uint3 currentCoords : SV_DispatchThreadID, ui
             if (cloudProperties.density > CLOUD_DENSITY_TRESHOLD)
             {
                 // Apply the extinction
-                const float3 currentStepExtinction = exp(- _ScatteringTint.xyz * cloudProperties.density * cloudProperties.sigmaT * stepSize);
+                const float3 currentStepExtinction = exp(-_ScatteringTint.xyz * cloudProperties.density * cloudProperties.sigmaT * stepSize);
                 transmittance *= Luminance(currentStepExtinction);
             }
         }
@@ -1572,3 +1573,68 @@ void ComputeVolumetricCloudsShadow(uint3 currentCoords : SV_DispatchThreadID, ui
 
     _VolumetricCloudsShadowRW[currentCoords.xy] = lerp(1.0 - _ShadowIntensity, 1.0, transmittance);
 }
+
+// LDS used to pre-fetch the neighborhood data a 8x8 region with a one pixel border (10x10)
+groupshared uint gs_cacheShadow[100];
+
+TEXTURE2D(_VolumetricCloudsShadow);
+
+void FillShadowLDSData(uint elementIndex, uint2 groupOrigin)
+{
+    // Define which value we will be acessing with this worker thread
+    int acessCoordX = elementIndex % 10;
+    int acessCoordY = elementIndex / 10;
+
+    // The initial position of the access
+    int2 originXY = (int2)groupOrigin - int2(1, 1) + int2(acessCoordX, acessCoordY);
+
+    // Compute the sample position
+    int2 tapCoord = int2(clamp(originXY.x, 0, _ShadowCookieResolution - 1), clamp(originXY.y, 0, _ShadowCookieResolution - 1));
+
+    // Read the value from the texture
+    float3 shadowValue = LOAD_TEXTURE2D(_VolumetricCloudsShadow, tapCoord.xy).xyz;
+
+    // Pack it and store it into the LDS
+    gs_cacheShadow[elementIndex] = PackToR11G11B10f(shadowValue);
+}
+
+uint ShadowOffsetToLDSAdress(uint2 groupThreadId, int2 offset)
+{
+    // Compute the tap coordinate in the 10x10 grid
+    uint2 tapAddress = (uint2)((int2)(groupThreadId + 1) + offset);
+    return clamp((uint)(tapAddress.x) % 10 + tapAddress.y * 10, 0, 99);
+}
+
+[numthreads(8, 8, 1)]
+void FilterVolumetricCloudsShadow(uint3 currentCoords : SV_DispatchThreadID, int groupIndex : SV_GroupIndex, uint2 groupThreadId : SV_GroupThreadID, uint2 groupId : SV_GroupID)
+{
+    UNITY_XR_ASSIGN_VIEW_INDEX(currentCoords.z);
+
+    // Fill the LDS with the shadow data
+    if (groupIndex < 50)
+    {
+        FillShadowLDSData(groupIndex * 2, groupId * 8);
+        FillShadowLDSData(groupIndex * 2 + 1, groupId * 8);
+    }
+    GroupMemoryBarrierWithGroupSync();
+
+    // Grab the center pixel
+    float3 centerShadow = UnpackFromR11G11B10f(gs_cacheShadow[ShadowOffsetToLDSAdress(groupThreadId, int2(0, 0))]);
+
+    // Average the 3x3 rgion
+    float3 filteredShadow = UnpackFromR11G11B10f(gs_cacheShadow[ShadowOffsetToLDSAdress(groupThreadId, int2(-1, -1))]);
+    filteredShadow += UnpackFromR11G11B10f(gs_cacheShadow[ShadowOffsetToLDSAdress(groupThreadId, int2(0, -1))]);
+    filteredShadow += UnpackFromR11G11B10f(gs_cacheShadow[ShadowOffsetToLDSAdress(groupThreadId, int2(1, -1))]);
+    filteredShadow += UnpackFromR11G11B10f(gs_cacheShadow[ShadowOffsetToLDSAdress(groupThreadId, int2(-1, 0))]);
+    filteredShadow += centerShadow;
+    filteredShadow += UnpackFromR11G11B10f(gs_cacheShadow[ShadowOffsetToLDSAdress(groupThreadId, int2(1, 0))]);
+    filteredShadow += UnpackFromR11G11B10f(gs_cacheShadow[ShadowOffsetToLDSAdress(groupThreadId, int2(-1, 1))]);
+    filteredShadow += UnpackFromR11G11B10f(gs_cacheShadow[ShadowOffsetToLDSAdress(groupThreadId, int2(0, 1))]);
+    filteredShadow += UnpackFromR11G11B10f(gs_cacheShadow[ShadowOffsetToLDSAdress(groupThreadId, int2(1, 1))]);
+
+    // We have a different behavior if this is a border pixel
+    float borderPixel = currentCoords.x == 0 || currentCoords.y == 0 || ((int)currentCoords.x) == (_ShadowCookieResolution - 1) || ((int)currentCoords.y) == (_ShadowCookieResolution - 1) ? 1.0 : 0.0;
+
+    // Normalize and return the result
+    _VolumetricCloudsShadowRW[currentCoords.xy] = lerp(filteredShadow * 0.1111111, centerShadow, borderPixel);
+}
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.cs
index 57d1a1acbdd..60cabeb6d89 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.cs
@@ -80,10 +80,12 @@ public enum CloudShadowResolution
             Medium256 = 256,
             /// <summary>The volumetric clouds shadow will be 512x512.</summary>
             High512 = 512,
+            /// <summary>The volumetric clouds shadow will be 1024x1024.</summary>
+            Ultra1024 = 1024,
         }
 
         /// <summary> </summary>
-        public const int CloudShadowResolutionCount = 4;
+        public const int CloudShadowResolutionCount = 5;
 
         /// <summary>
         /// A <see cref="VolumeParameter"/> that holds a <see cref="CloudControl"/> value.
diff --git a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs
index e06e5d423c9..30890c2390c 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs
@@ -481,6 +481,7 @@ static class HDShaderIDs
         public static readonly int _CloudsAdditionalTextureRW = Shader.PropertyToID("_CloudsAdditionalTextureRW");
         public static readonly int _VolumetricCloudsTexture = Shader.PropertyToID("_VolumetricCloudsTexture");
         public static readonly int _VolumetricCloudsTextureRW = Shader.PropertyToID("_VolumetricCloudsTextureRW");
+        public static readonly int _VolumetricCloudsShadow = Shader.PropertyToID("_VolumetricCloudsShadow");
         public static readonly int _VolumetricCloudsShadowRW = Shader.PropertyToID("_VolumetricCloudsShadowRW");
         public static readonly int _VolumetricCloudsUpscaleTextureRW = Shader.PropertyToID("_VolumetricCloudsUpscaleTextureRW");
         public static readonly int _HistoryVolumetricClouds0Texture = Shader.PropertyToID("_HistoryVolumetricClouds0Texture");

From 7ea1e42107fccbab2f1a4afe3b579bcfedbf2354 Mon Sep 17 00:00:00 2001
From: Anis Benyoub <anis@unity3d.com>
Date: Thu, 9 Sep 2021 14:29:41 +0200
Subject: [PATCH 06/10] Additinal fixes

---
 .../HDRenderPipeline.VolumetricClouds.cs               | 10 +++++-----
 .../VolumetricLighting/VolumetricClouds.compute        |  4 ++--
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
index 89ee25d1853..6be5f6baecc 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
@@ -173,7 +173,7 @@ void GetPresetCloudMapValues(VolumetricClouds.CloudPresets preset, out CloudMode
             {
                 case VolumetricClouds.CloudPresets.Sparse:
                 {
-                    cloudModelData.densityMultiplier = 0.3f;
+                    cloudModelData.densityMultiplier = 0.25f;
                     cloudModelData.shapeFactor = 0.9f;
                     cloudModelData.shapeScale = 3.0f;
                     cloudModelData.erosionFactor = 0.9f;
@@ -183,7 +183,7 @@ void GetPresetCloudMapValues(VolumetricClouds.CloudPresets preset, out CloudMode
                 }
                 case VolumetricClouds.CloudPresets.Cloudy:
                 {
-                    cloudModelData.densityMultiplier = 0.35f;
+                    cloudModelData.densityMultiplier = 0.3f;
                     cloudModelData.shapeFactor = 0.9f;
                     cloudModelData.shapeScale = 5.0f;
                     cloudModelData.erosionFactor = 0.9f;
@@ -203,11 +203,11 @@ void GetPresetCloudMapValues(VolumetricClouds.CloudPresets preset, out CloudMode
                 }
                 case VolumetricClouds.CloudPresets.Stormy:
                 {
-                    cloudModelData.densityMultiplier = 0.35f;
+                    cloudModelData.densityMultiplier = 0.3f;
                     cloudModelData.shapeFactor = 0.85f;
-                    cloudModelData.shapeScale = 3.5f;
+                    cloudModelData.shapeScale = 3.0f;
                     cloudModelData.erosionFactor = 0.95f;
-                    cloudModelData.erosionScale = 70.0f;
+                    cloudModelData.erosionScale = 60.0f;
                     cloudModelData.erosionNoise = VolumetricClouds.CloudErosionNoise.Perlin32;
                     return;
                 }
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.compute b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.compute
index cad84b01da9..547acb7435b 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.compute
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.compute
@@ -599,10 +599,10 @@ float3 EvaluateSunLuminance(float3 positionWS, float3 sunDirection, float3 sunCo
 
         // Collect total density along light ray.
         float lastDist = 0;
-        for (int j = 1; j <= _NumLightSteps; j++)
+        for (int j = 0; j < _NumLightSteps; j++)
         {
             // The samples are not linearly distributed along the point-light direction due to their low number. We sample they in a logarithmic way.
-            float dist = stepSize * j;
+            float dist = stepSize * (0.25 + j);
 
             // Evaluate the current sample point
             float3 currentSamplePointWS = positionWS + sunDirection * dist;

From 52a361817f495f0ba94713ee05cb4c0f2cfa241d Mon Sep 17 00:00:00 2001
From: Anis Benyoub <anis@unity3d.com>
Date: Thu, 9 Sep 2021 15:01:08 +0200
Subject: [PATCH 07/10] Added a new sun light dimmer on the volumetric clouds
 volume (case 1364152).

---
 com.unity.render-pipelines.high-definition/CHANGELOG.md     | 1 +
 .../Documentation~/Override-Volumetric-Clouds.md            | 1 +
 .../Lighting/VolumetricLighting/VolumetricCloudsEditor.cs   | 3 +++
 .../Lighting/ScreenSpaceLighting/BilateralUpsample.hlsl     | 2 +-
 .../VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs | 2 +-
 .../Runtime/Lighting/VolumetricLighting/VolumetricClouds.cs | 6 ++++++
 6 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index b2e8ed075a6..a0ab1c3ba23 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Added
 - Added an option for the ultra 1024x1024 mode for the volumetric cloud shadows and a filtering pass to reduce the aliasing artifacts of the clouds shadow.
+- Added a new sun light dimmer on the volumetric clouds volume (case 1364152).
 
 ## [12.0.0] - 2021-01-11
 
diff --git a/com.unity.render-pipelines.high-definition/Documentation~/Override-Volumetric-Clouds.md b/com.unity.render-pipelines.high-definition/Documentation~/Override-Volumetric-Clouds.md
index 8e9c4be8998..2844aa1f3af 100644
--- a/com.unity.render-pipelines.high-definition/Documentation~/Override-Volumetric-Clouds.md
+++ b/com.unity.render-pipelines.high-definition/Documentation~/Override-Volumetric-Clouds.md
@@ -128,6 +128,7 @@ When importing these two map Textures, disable **sRGB**. For best results, do no
 | **Property**                   | **Description**                                              |
 | ------------------------------ | ------------------------------------------------------------ |
 | **Ambient Light Probe Dimmer** | Controls the influence of light probes on the cloud volume. A lower value suppresses the ambient light and produces darker clouds overall. |
+| **Sun Light Dimmer**           | Controls the influence of the sun light on the cloud volume. A lower value suppresses the sun light and produces darker clouds overall. |
 | **Erosion Occlusion**          | Controls how much Erosion Factor is taken into account when computing ambient occlusion. The Erosion Factor parameter is editable in the custom preset, Advanced and Manual Modes. |
 | **Scattering Tint**            | The color to tint the clouds.                                |
 | **Powder Effect Intensity**    | Controls the amount of local scattering in the clouds. When clouds have a lot of local details due to erosion, a value of **1** provides a more powdery aspect. |
diff --git a/com.unity.render-pipelines.high-definition/Editor/Lighting/VolumetricLighting/VolumetricCloudsEditor.cs b/com.unity.render-pipelines.high-definition/Editor/Lighting/VolumetricLighting/VolumetricCloudsEditor.cs
index 9c7114e3115..4a26a56b769 100644
--- a/com.unity.render-pipelines.high-definition/Editor/Lighting/VolumetricLighting/VolumetricCloudsEditor.cs
+++ b/com.unity.render-pipelines.high-definition/Editor/Lighting/VolumetricLighting/VolumetricCloudsEditor.cs
@@ -56,6 +56,7 @@ class VolumetricCloudsEditor : VolumeComponentEditor
         SerializedDataParameter m_PowderEffectIntensity;
         SerializedDataParameter m_MultiScattering;
         SerializedDataParameter m_AmbientLightProbeDimmer;
+        SerializedDataParameter m_SunLightDimmer;
         SerializedDataParameter m_ErosionOcclusion;
 
         // Wind
@@ -134,6 +135,7 @@ public override void OnEnable()
             m_PowderEffectIntensity = Unpack(o.Find(x => x.powderEffectIntensity));
             m_MultiScattering = Unpack(o.Find(x => x.multiScattering));
             m_AmbientLightProbeDimmer = Unpack(o.Find(x => x.ambientLightProbeDimmer));
+            m_SunLightDimmer = Unpack(o.Find(x => x.sunLightDimmer));
             m_ErosionOcclusion = Unpack(o.Find(x => x.erosionOcclusion));
 
             // Wind
@@ -273,6 +275,7 @@ public override void OnInspectorGUI()
             DrawHeader("Lighting");
             {
                 PropertyField(m_AmbientLightProbeDimmer);
+                PropertyField(m_SunLightDimmer);
                 PropertyField(m_ErosionOcclusion);
                 PropertyField(m_ScatteringTint);
                 PropertyField(m_PowderEffectIntensity);
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/ScreenSpaceLighting/BilateralUpsample.hlsl b/com.unity.render-pipelines.high-definition/Runtime/Lighting/ScreenSpaceLighting/BilateralUpsample.hlsl
index eee568c1e65..fb784dfec71 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/ScreenSpaceLighting/BilateralUpsample.hlsl
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/ScreenSpaceLighting/BilateralUpsample.hlsl
@@ -170,6 +170,6 @@ float4 BilUpColor3x3(float highDepth, in NeighborhoodUpsampleData3x3 data)
                         + data.lowValue6 * combinedWeightsB.z
                         + data.lowValue7 * combinedWeightsB.w
                         + data.lowValue8 * combinedWeightsC
-                        +  float4(_NoiseFilterStrength, _NoiseFilterStrength, _NoiseFilterStrength, 0.0);
+                        + float4(_NoiseFilterStrength, _NoiseFilterStrength, _NoiseFilterStrength, 0.0);
     return WeightedSum / TotalWeight;
 }
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
index 6be5f6baecc..ae40b57e0d8 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs
@@ -415,7 +415,7 @@ void UpdateShaderVariableslClouds(ref ShaderVariablesClouds cb, HDCamera hdCamer
 
                 if (!shadowPass)
                 {
-                    cb._SunLightColor = m_lightList.directionalLights[0].color;
+                    cb._SunLightColor = m_lightList.directionalLights[0].color * settings.sunLightDimmer.value;
                 }
             }
             else
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.cs
index 60cabeb6d89..0c0e089fa43 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/VolumetricClouds.cs
@@ -411,6 +411,12 @@ public CloudFadeInModeParameter(CloudFadeInMode value, bool overrideState = fals
         [Tooltip("Controls the influence of the light probes on the cloud volume. A lower value will suppress the ambient light and produce darker clouds overall.")]
         public ClampedFloatParameter ambientLightProbeDimmer = new ClampedFloatParameter(1.0f, 0.0f, 1.0f);
 
+        /// <summary>
+        /// Controls the influence of the sun light on the cloud volume. A lower value will suppress the sun light and produce darker clouds overall.
+        /// </summary>
+        [Tooltip("Controls the influence of the sun light on the cloud volume. A lower value will suppress the sun light and produce darker clouds overall.")]
+        public ClampedFloatParameter sunLightDimmer = new ClampedFloatParameter(1.0f, 0.0f, 1.0f);
+
         /// <summary>
         /// Controls how much Erosion Factor is taken into account when computing ambient occlusion. The Erosion Factor parameter is editable in the custom preset, Advanced and Manual Modes.
         /// </summary>

From 0b439636fe9c6af2c134abad6868c8a9b4d36652 Mon Sep 17 00:00:00 2001
From: Anis Benyoub <anis@unity3d.com>
Date: Thu, 9 Sep 2021 15:19:53 +0200
Subject: [PATCH 08/10] Fix error cloud ambient probe

---
 ...RenderPipeline.VolumetricCloudsLighting.cs | 27 ++++++++++++-------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsLighting.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsLighting.cs
index edcb47517d3..ca9373ccb47 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsLighting.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricCloudsLighting.cs
@@ -147,16 +147,23 @@ internal void PreRenderVolumetricClouds_AmbientProbe(RenderGraph renderGraph, HD
                 builder.SetRenderFunc(
                     (VolumetricCloudsAmbientProbeData data, RenderGraphContext ctx) =>
                     {
-                        // Render the sky into a low resolution cubemap
-                        data.skyManager.RenderSkyOnlyToCubemap(ctx.cmd, data.skyCubemap, false, data.skyRenderer);
-
-                        // Evaluate the probe
-                        ctx.cmd.SetComputeTextureParam(data.computeProbeCS, data.kernel, m_AmbientProbeInputCubemap, data.skyCubemap);
-                        ctx.cmd.SetComputeBufferParam(data.computeProbeCS, data.kernel, m_AmbientProbeOutputBufferParam, data.ambientProbeBuffer);
-                        ctx.cmd.DispatchCompute(data.computeProbeCS, data.kernel, 1, 1, 1);
-
-                        // Enqueue the read back
-                        ctx.cmd.RequestAsyncReadback(data.ambientProbeBuffer, OnComputeAmbientProbeDone);
+                        if (data.skyRenderer != null)
+                        {
+                            // Render the sky into a low resolution cubemap
+                            data.skyManager.RenderSkyOnlyToCubemap(ctx.cmd, data.skyCubemap, false, data.skyRenderer);
+
+                            // Evaluate the probe
+                            ctx.cmd.SetComputeTextureParam(data.computeProbeCS, data.kernel, m_AmbientProbeInputCubemap, data.skyCubemap);
+                            ctx.cmd.SetComputeBufferParam(data.computeProbeCS, data.kernel, m_AmbientProbeOutputBufferParam, data.ambientProbeBuffer);
+                            ctx.cmd.DispatchCompute(data.computeProbeCS, data.kernel, 1, 1, 1);
+
+                            // Enqueue the read back
+                            ctx.cmd.RequestAsyncReadback(data.ambientProbeBuffer, OnComputeAmbientProbeDone);
+                        }
+                        else
+                        {
+                            m_CloudsAmbientProbeIsReady = false;
+                        }
                     });
             }
         }

From 11204bf2336ea8fb711c3936374e1455252df0c5 Mon Sep 17 00:00:00 2001
From: Anis Benyoub <anis@unity3d.com>
Date: Thu, 9 Sep 2021 18:03:29 +0200
Subject: [PATCH 09/10] Update all the clouds screenshots

---
 .../Linear/LinuxPlayer/Vulkan/None/004-CloudsFlaresDecals.png | 4 ++--
 .../Linear/OSXPlayer/Metal/None/004-CloudsFlaresDecals.png    | 4 ++--
 .../WindowsPlayer/Direct3D11/None/004-CloudsFlaresDecals.png  | 4 ++--
 .../WindowsPlayer/Direct3D12/None/004-CloudsFlaresDecals.png  | 4 ++--
 .../WindowsPlayer/Vulkan/None/004-CloudsFlaresDecals.png      | 4 ++--
 .../Linear/LinuxEditor/Vulkan/None/5011_VolumetricClouds.png  | 4 ++--
 .../LinuxEditor/Vulkan/None/5011_VolumetricCloudsShadows.png  | 4 ++--
 .../Vulkan/None/5011_VolumetricCloudsShadowsBake.png          | 4 ++--
 .../Vulkan/None/5012_VolumetricCloudsRelativeClouds.png       | 4 ++--
 .../None/5013_VolumetricCloudsShadowsNoExposureControl.png    | 4 ++--
 .../LinuxEditor/Vulkan/None/5014_VolumetricCloudsBanding.png  | 4 ++--
 .../Vulkan/None/5015_VolumetricCloudsProbeAndSky.png          | 4 ++--
 .../Vulkan/None/5015_VolumetricClouds_ProbeGradient.png       | 4 ++--
 .../Linear/OSXEditor/Metal/None/5011_VolumetricClouds.png     | 4 ++--
 .../OSXEditor/Metal/None/5011_VolumetricCloudsShadows.png     | 4 ++--
 .../OSXEditor/Metal/None/5011_VolumetricCloudsShadowsBake.png | 4 ++--
 .../Metal/None/5012_VolumetricCloudsRelativeClouds.png        | 4 ++--
 .../None/5013_VolumetricCloudsShadowsNoExposureControl.png    | 4 ++--
 .../OSXEditor/Metal/None/5014_VolumetricCloudsBanding.png     | 4 ++--
 .../OSXEditor/Metal/None/5015_VolumetricCloudsProbeAndSky.png | 4 ++--
 .../Metal/None/5015_VolumetricClouds_ProbeGradient.png        | 4 ++--
 .../WindowsEditor/Direct3D11/None/5011_VolumetricClouds.png   | 4 ++--
 .../Direct3D11/None/5011_VolumetricCloudsShadows.png          | 4 ++--
 .../Direct3D11/None/5011_VolumetricCloudsShadowsBake.png      | 4 ++--
 .../Direct3D11/None/5012_VolumetricCloudsRelativeClouds.png   | 4 ++--
 .../None/5013_VolumetricCloudsShadowsNoExposureControl.png    | 4 ++--
 .../Direct3D11/None/5014_VolumetricCloudsBanding.png          | 4 ++--
 .../Direct3D11/None/5015_VolumetricCloudsProbeAndSky.png      | 4 ++--
 .../Direct3D11/None/5015_VolumetricClouds_ProbeGradient.png   | 4 ++--
 .../WindowsEditor/Direct3D12/None/5011_VolumetricClouds.png   | 4 ++--
 .../Direct3D12/None/5011_VolumetricCloudsShadows.png          | 4 ++--
 .../Direct3D12/None/5011_VolumetricCloudsShadowsBake.png      | 4 ++--
 .../Direct3D12/None/5012_VolumetricCloudsRelativeClouds.png   | 4 ++--
 .../None/5013_VolumetricCloudsShadowsNoExposureControl.png    | 4 ++--
 .../Direct3D12/None/5014_VolumetricCloudsBanding.png          | 4 ++--
 .../Direct3D12/None/5015_VolumetricCloudsProbeAndSky.png      | 4 ++--
 .../Direct3D12/None/5015_VolumetricClouds_ProbeGradient.png   | 4 ++--
 .../WindowsEditor/Vulkan/None/5011_VolumetricClouds.png       | 4 ++--
 .../Vulkan/None/5011_VolumetricCloudsShadows.png              | 4 ++--
 .../Vulkan/None/5011_VolumetricCloudsShadowsBake.png          | 4 ++--
 .../Vulkan/None/5012_VolumetricCloudsRelativeClouds.png       | 4 ++--
 .../None/5013_VolumetricCloudsShadowsNoExposureControl.png    | 4 ++--
 .../Vulkan/None/5014_VolumetricCloudsBanding.png              | 4 ++--
 .../Vulkan/None/5015_VolumetricCloudsProbeAndSky.png          | 4 ++--
 .../Vulkan/None/5015_VolumetricClouds_ProbeGradient.png       | 4 ++--
 45 files changed, 90 insertions(+), 90 deletions(-)

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From 16c2a3a1589b83a008a2c598a94ea23c1d4adeaf Mon Sep 17 00:00:00 2001
From: Anis Benyoub <anis@unity3d.com>
Date: Fri, 10 Sep 2021 10:41:06 +0200
Subject: [PATCH 10/10] review fixes

---
 com.unity.render-pipelines.high-definition/CHANGELOG.md | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index a0ab1c3ba23..d935e62f4f4 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -16,15 +16,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed edge bleeding when rendering volumetric clouds.
 - Fixed regression in the ambient probe intensity for volumetric clouds.
 - Fixed the sun leaking from behind fully opaque clouds.
+- Fixed artifacts in volumetric cloud shadows.
+- Fixed the missing parameter to control the sun light dimmer (case 1364152).
+- Fixed regression in the clouds presets.
 
 ### Changed
 - Visual Environment ambient mode is now Dynamic by default.
-- Changed the volumetric clouds presets.
-- Changed the number of steps to evaluate the shadow from 9 to 16.
-
-### Added
-- Added an option for the ultra 1024x1024 mode for the volumetric cloud shadows and a filtering pass to reduce the aliasing artifacts of the clouds shadow.
-- Added a new sun light dimmer on the volumetric clouds volume (case 1364152).
 
 ## [12.0.0] - 2021-01-11