Fix uninitialized variable for shadow cascades

com.unity.render-pipelines.universal/CHANGELOG.md

@@ -37,6 +37,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed an issue in shaderGraph target where the ShaderPass.hlsl was being included after SHADERPASS was defined
 - Fixed an issue where Particle Lit shader had an incorrect fallback shader [case 1312459]
 - Fixed an issue with backbuffer MSAA on Vulkan desktop platforms.
+- Fixed shadow cascade blend culling factor.
 
 ### Changed
 - Change Asset/Create/Shader/Universal Render Pipeline/Lit Shader Graph to Asset/Create/Shader Graph/URP/Lit Shader Graph

com.unity.render-pipelines.universal/Runtime/Passes/MainLightShadowCasterPass.cs

@@ -176,10 +176,7 @@ void RenderMainLightCascadeShadowmap(ref ScriptableRenderContext context, ref Cu
 
                 for (int cascadeIndex = 0; cascadeIndex < m_ShadowCasterCascadesCount; ++cascadeIndex)
                 {
-                    //settings.splitData = m_CascadeSlices[cascadeIndex].splitData; // NOTE: currently DrawShadows culls more casters if no ShadowSplitData.cullingPlanes are set (version cds 8652678b), so it is currently better to not pass the m_CascadeSlices[cascadeIndex].splitData object returned by CullingResults.ComputeDirectionalShadowMatricesAndCullingPrimitives (change introduced in 8bf71cf). Culling is only based on the ShadowSplitData.cullingSphere distances.
-                    var splitData = settings.splitData;
-                    splitData.cullingSphere = m_CascadeSplitDistances[cascadeIndex];
-                    settings.splitData = splitData;
+                    settings.splitData = m_CascadeSlices[cascadeIndex].splitData;
 
                     Vector4 shadowBias = ShadowUtils.GetShadowBias(ref shadowLight, shadowLightIndex, ref shadowData, m_CascadeSlices[cascadeIndex].projectionMatrix, m_CascadeSlices[cascadeIndex].resolution);
                     ShadowUtils.SetupShadowCasterConstantBuffer(cmd, ref shadowLight, shadowBias);

com.unity.render-pipelines.universal/Runtime/ShadowUtils.cs

@@ -57,6 +57,10 @@ public static bool ExtractDirectionalLightMatrix(ref CullingResults cullResults,
             shadowSliceData.resolution = shadowResolution;
             shadowSliceData.shadowTransform = GetShadowTransform(shadowSliceData.projectionMatrix, shadowSliceData.viewMatrix);
 
+            // This used to be fixed to .6f, but is now configureable.
+            // It is the culling sphere radius multiplier for shadow cascade blending
+            shadowSliceData.splitData.shadowCascadeBlendCullingFactor = 0.6f;
+
             // If we have shadow cascades baked into the atlas we bake cascade transform
             // in each shadow matrix to save shader ALU and L/S
             if (shadowData.mainLightShadowCascadesCount > 1)