Fix POM with object scale

SampleScenes/HDTest/GraphicTest/Parallax Occlusion Mapping/Material/POM - Wood.mat

   m_Name: POM - Wood
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
   m_ShaderKeywords: _DEPTHOFFSET_ON _HEIGHTMAP _NORMALMAP _NORMALMAP_TANGENT_SPACE
-    _PER_PIXEL_DISPLACEMENT
+    _PER_PIXEL_DISPLACEMENT _PER_PIXEL_DISPLACEMENT_OBJECT_SCALE
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveIntensity: 0
     - _EnablePerPixelDisplacement: 1
     - _EnableSpecularOcclusion: 0
+    - _EnableVertexDisplacement: 0
     - _EnableWind: 0
     - _GlossMapScale: 1
     - _Glossiness: 0.5
     - _PPDMaxSamples: 15
     - _PPDMinSamples: 1
     - _Parallax: 0.02
+    - _PerPixelDisplacementObjectScale: 1
     - _ShiverDirectionality: 0.5
     - _ShiverDrag: 0.2
     - _Smoothness: 0.5
     - _UVDetail: 0
     - _UVMappingPlanar: 0
     - _UVSec: 0
+    - _VertexDisplacementObjectScale: 1
+    - _VertexDisplacementTilingScale: 1
     - _ZTestMode: 8
     - _ZWrite: 1
     m_Colors:

SampleScenes/HDTest/GraphicTest/Tessellation/Material/Tessellation - Wood.mat

   m_Name: Tessellation - Wood
   m_Shader: {fileID: 4800000, guid: 756bac9090102564582875f4c7e30202, type: 3}
   m_ShaderKeywords: _HEIGHTMAP _NORMALMAP _NORMALMAP_TANGENT_SPACE _TESSELLATION_DISPLACEMENT
-    _TESSELLATION_OBJECT_SCALE _TESSELLATION_TILING_SCALE
+    _TESSELLATION_OBJECT_SCALE _TESSELLATION_PHONG _TESSELLATION_TILING_SCALE _VERTEX_DISPLACEMENT
+    _VERTEX_DISPLACEMENT_OBJECT_SCALE _VERTEX_DISPLACEMENT_TILING_SCALE
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveIntensity: 0
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
+    - _EnableVertexDisplacement: 1
     - _EnableWind: 0
     - _GlossMapScale: 1
     - _Glossiness: 0.5
     - _PPDMaxSamples: 64
     - _PPDMinSamples: 1
     - _Parallax: 0.02
+    - _PerPixelDisplacementObjectScale: 1
     - _ShiverDirectionality: 0.5
     - _ShiverDrag: 0.2
     - _Smoothness: 0.5
     - _UVDetail: 0
     - _UVMappingPlanar: 0
     - _UVSec: 0
+    - _VertexDisplacementObjectScale: 1
+    - _VertexDisplacementTilingScale: 1
     - _ZTestMode: 8
     - _ZWrite: 1
     m_Colors:

SampleScenes/HDTest/HDRenderLoopTest.unity

   m_PrefabInternal: {fileID: 0}
   m_GameObject: {fileID: 874252441}
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: 10, y: 1, z: -14}
-  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_LocalPosition: {x: 10, y: 1, z: -16}
+  m_LocalScale: {x: 0.5, y: 0.5, z: 0.5}
   m_Children:
   - {fileID: 1950745466}
   - {fileID: 122368351}

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitData.hlsl

         // To handle object scaling with PPD we need to multiply the view vector by the inverse scale. 
         // Currently we extract the inverse scale directly by taking worldToObject matrix (instead of ObjectToWorld)
         float3 objectScale;
-        float4x4 worldTransform = GetObjectToWorldMatrix();
+        float4x4 worldTransform = GetWorldToObjectMatrix();
         objectScale.x = length(float3(worldTransform._m00, worldTransform._m01, worldTransform._m02));
         objectScale.y = length(float3(worldTransform._m10, worldTransform._m11, worldTransform._m12));
         objectScale.z = length(float3(worldTransform._m20, worldTransform._m21, worldTransform._m22));
 
             float3x3 worldToTangent = input.worldToTangent;
 
-#ifdef _PER_PIXEL_DISPLACEMENT_OBJECT_SCALE
-            //V *= objectScale;
-#endif
-
-            viewDirTS *= 1.0 / objectScale;
+            viewDirTS *= objectScale.xzy; // Switch from Y-up to Z-up
-
-            int numSteps = (int)lerp(_PPDMaxSamples, _PPDMinSamples, viewDirTS.z);
-
-            float2 offset = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirTS, maxHeight, ppdParam, height);
+            int    numSteps = (int)lerp(_PPDMaxSamples, _PPDMinSamples, saturate(viewDirTS.z));
+            float2 offset   = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirTS, maxHeight, ppdParam, height);
 
             // Apply offset to all UVSet0 / planar
             layerTexCoord.base.uv += offset;