Hdrp/fix rt odd negative scale

com.unity.render-pipelines.core/ShaderLibrary/SpaceTransforms.hlsl

@@ -49,7 +49,10 @@ float3 GetCameraRelativePositionWS(float3 positionWS)
 
 real GetOddNegativeScale()
 {
-    return unity_WorldTransformParams.w;
+    // FIXME: We should be able to just return unity_WorldTransformParams.w, but it is not
+    // properly set at the moment, when doing ray-tracing; once this has been fixed in cpp,
+    // we can revert back to the former implementation.
+    return unity_WorldTransformParams.w >= 0.0 ? 1.0 : -1.0;
 }
 
 float3 TransformObjectToWorld(float3 positionOS)

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

@@ -723,6 +723,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed overused the atlas for Animated/Render Target Cookies (1259930).
 - Fixed sky asserts with XR multipass
 - Fixed for area light not updating baked light result when modifying with gizmo.
+- Fixed robustness issue with GetOddNegativeScale() in ray tracing, which was impacting normal mapping (1261160).
 
 ### Changed
 - Improve MIP selection for decals on Transparents

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/Raytracing/Shaders/RaytracingFragInputs.hlsl

@@ -10,8 +10,8 @@ void BuildFragInputsFromIntersection(IntersectionVertex currentVertex, float3 in
 	outFragInputs.color = currentVertex.color;
 
     float3 normalWS = normalize(mul(currentVertex.normalOS, (float3x3)WorldToObject3x4()));
-	float4 tangentWS = float4(normalize(mul(currentVertex.tangentOS.xyz, (float3x3)WorldToObject3x4())), currentVertex.tangentOS.w);
-	outFragInputs.tangentToWorld = BuildTangentToWorld(tangentWS, normalWS);
+	float3 tangentWS = normalize(mul(currentVertex.tangentOS.xyz, (float3x3)WorldToObject3x4()));
+	outFragInputs.tangentToWorld = CreateTangentToWorld(normalWS, tangentWS, sign(currentVertex.tangentOS.w));
 
 	outFragInputs.isFrontFace = dot(incidentDirection, outFragInputs.tangentToWorld[2]) < 0.0f;
 }