HDRP: Improve camrea relative rendering for LPPV + Fix stacklit planar mapping

com.unity.render-pipelines.high-definition/HDRP/Material/MaterialUtilities.hlsl

+// Return camera relative probe volume world to object transformation
+float4x4 GetProbeVolumeWorldToObject()
+{
+    return ApplyCameraTranslationToInverseMatrix(unity_ProbeVolumeWorldToObject);
+}
+    
 // In unity we can have a mix of fully baked lightmap (static lightmap) + enlighten realtime lightmap (dynamic lightmap)
 // for each case we can have directional lightmap or not.
 // Else we have lightprobe for dynamic/moving entity. Either SH9 per object lightprobe or SH4 per pixel per object volume probe
     }
     else
     {
-        // TODO: We use GetAbsolutePositionWS(positionRWS) to handle the camera relative case here but this should be part of the unity_ProbeVolumeWorldToObject matrix on C++ side (sadly we can't modify it for HDRenderPipeline...)
-        return SampleProbeVolumeSH4(TEXTURE3D_PARAM(unity_ProbeVolumeSH, samplerunity_ProbeVolumeSH), GetAbsolutePositionWS(positionRWS), normalWS, unity_ProbeVolumeWorldToObject,
+        return SampleProbeVolumeSH4(TEXTURE3D_PARAM(unity_ProbeVolumeSH, samplerunity_ProbeVolumeSH), positionRWS, normalWS, GetProbeVolumeWorldToObject(),
                                     unity_ProbeVolumeParams.y, unity_ProbeVolumeParams.z, unity_ProbeVolumeMin, unity_ProbeVolumeSizeInv);
     }
 
     float4 rawOcclusionMask;
     if (unity_ProbeVolumeParams.x == 1.0)
     {
-        // TODO: We use GetAbsolutePositionWS(positionRWS) to handle the camera relative case here but this should be part of the unity_ProbeVolumeWorldToObject matrix on C++ side (sadly we can't modify it for HDRenderPipeline...)
-        rawOcclusionMask = SampleProbeOcclusion(TEXTURE3D_PARAM(unity_ProbeVolumeSH, samplerunity_ProbeVolumeSH), GetAbsolutePositionWS(positionRWS), unity_ProbeVolumeWorldToObject,
+        rawOcclusionMask = SampleProbeOcclusion(TEXTURE3D_PARAM(unity_ProbeVolumeSH, samplerunity_ProbeVolumeSH), positionRWS, GetProbeVolumeWorldToObject(),
                                                 unity_ProbeVolumeParams.y, unity_ProbeVolumeParams.z, unity_ProbeVolumeMin, unity_ProbeVolumeSizeInv);
     }
     else

com.unity.render-pipelines.high-definition/HDRP/Material/StackLit/StackLitData.hlsl

 
 void InitializeMappingData(FragInputs input, out TextureUVMapping uvMapping)
 {
-    float3 position = GetAbsolutePositionWS(input.positionRWS);
     float2 uvXZ;
     float2 uvXY;
     float2 uvZY;
     uvMapping.texcoords[TEXCOORD_INDEX_UV3][0] = uvMapping.texcoords[TEXCOORD_INDEX_UV3][1] = input.texCoord3.xy;
 
     // planar/triplanar
-    GetTriplanarCoordinate(position, uvXZ, uvXY, uvZY);
+    GetTriplanarCoordinate(GetAbsolutePositionWS(input.positionRWS), uvXZ, uvXY, uvZY);
-    position = TransformWorldToObject(position);
-    GetTriplanarCoordinate(position, uvXZ, uvXY, uvZY);
+    GetTriplanarCoordinate(TransformWorldToObject(input.positionRWS), uvXZ, uvXY, uvZY);
     uvMapping.texcoords[TEXCOORD_INDEX_PLANAR_XY][1] = uvXY;
     uvMapping.texcoords[TEXCOORD_INDEX_PLANAR_YZ][1] = uvZY;
     uvMapping.texcoords[TEXCOORD_INDEX_PLANAR_ZX][1] = uvXZ;