Fix cached directional shadows disappearing when going out of shadow range to never reappear

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -76,6 +76,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed Normal Map assiignation when importing FBX Materials.
 - Fixed issue with HDRI Sky and shadow filtering quality set to high.
 - Fixed the default custom pass buffer format from R8G8B8A8_SNorm to R8G8B8A8_UNorm. Additionally, an option in the custom pass buffer format settings is available to use the old format.
+- Fixed cached directional light shadows disappearing without reappearing when the going outside of the range of shadow validity.
 
 ## [14.0.0] - 2021-11-17
 

com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDShadowAtlas.cs

@@ -192,6 +192,13 @@ public TextureHandle GetOutputTexture(RenderGraph renderGraph)
             if (m_UseSharedTexture)
             {
                 Debug.Assert(m_Output.IsValid());
+                var requestedDesc = GetAtlasDesc();
+                // We check if we need to refresh the desc. It is needed for directional lights.
+                if (renderGraph.GetTextureDesc(m_Output).width != requestedDesc.width)
+                {
+                    renderGraph.RefreshSharedTextureDesc(m_Output, requestedDesc);
+                }
+
                 return m_Output; // Should always be valid.
             }
             else

com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDShadowManager.cs

@@ -358,7 +358,7 @@ public void InitShadowManager(HDRenderPipelineRuntimeResources renderPipelineRes
             HDShadowAtlas.BlurAlgorithm cascadeBlur = GetDirectionalShadowAlgorithm() == DirectionalShadowAlgorithm.IMS ? HDShadowAtlas.BlurAlgorithm.IM : HDShadowAtlas.BlurAlgorithm.None;
 
             HDShadowAtlas.HDShadowAtlasInitParameters dirAtlasInitParams = punctualAtlasInitParams;
-            dirAtlasInitParams.useSharedTexture = false;
+            dirAtlasInitParams.useSharedTexture = true;
             dirAtlasInitParams.width = 1;
             dirAtlasInitParams.height = 1;
             dirAtlasInitParams.atlasShaderID = HDShaderIDs._ShadowmapCascadeAtlas;