Fix TAA with no motion vectors

com.unity.render-pipelines.core/Runtime/RenderGraph/RenderGraphBuilder.cs

@@ -227,7 +227,7 @@ void CheckTransientResource(in ResourceHandle res)
 
                 if (transientIndex != -1 && transientIndex != m_RenderPass.index)
                 {
-                    throw new ArgumentException($"Trying to use a transient texture (pass index {transientIndex}) in a different pass (pass index {m_RenderPass.index}.");
+                    throw new ArgumentException($"Trying to use a transient texture (pass index {transientIndex}) in a different pass (pass index {m_RenderPass.index}).");
                 }
             }
 #endif

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

@@ -23,10 +23,11 @@ The version number for this package has increased due to a version update of a r
 - Fixed a migration issue with the rendering queue in ShaderGraph when upgrading to 10.x;
 - Fixed upside down XR occlusion mesh.
 - Fixed precision issue with the atmospheric fog.
-- Claryfied doc for the LayeredLit material.
+- Fixed issue with TAA and no motion vectors.
 
 ### Changed
 - Combined occlusion meshes into one to reduce draw calls and state changes with XR single-pass.
+- Claryfied doc for the LayeredLit material.
 
 ## [10.1.0] - 2020-10-12
 

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.PostProcess.cs

@@ -50,6 +50,7 @@ TextureHandle RenderPostProcess(    RenderGraph     renderGraph,
                 }
             }
 
+            var motionVectors = hdCamera.frameSettings.IsEnabled(FrameSettingsField.MotionVectors) ? prepassOutput.resolvedMotionVectorsBuffer : renderGraph.defaultResources.blackTextureXR;
             m_PostProcessSystem.Render(
                 renderGraph,
                 parameters.hdCamera,
@@ -59,7 +60,7 @@ TextureHandle RenderPostProcess(    RenderGraph     renderGraph,
                 prepassOutput.resolvedDepthBuffer,
                 prepassOutput.depthPyramidTexture,
                 prepassOutput.resolvedNormalBuffer,
-                prepassOutput.resolvedMotionVectorsBuffer,
+                motionVectors,
                 dest,
                 parameters.flipYInPostProcess
             );