HDRenderPipeline: Test Per Pixel scale lock

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Editor/BaseLitUI.cs

                 m_MaterialEditor.ShaderProperty(ppdMaxSamples, StylesBaseLit.ppdMaxSamplesText);
                 ppdMinSamples.floatValue = Mathf.Min(ppdMinSamples.floatValue, ppdMaxSamples.floatValue);
                 m_MaterialEditor.ShaderProperty(ppdLodThreshold, StylesBaseLit.ppdLodThresholdText);
-                //m_MaterialEditor.ShaderProperty(perPixelDisplacementObjectScale, StylesBaseLit.perPixelDisplacementObjectScaleText);
+                m_MaterialEditor.ShaderProperty(perPixelDisplacementObjectScale, StylesBaseLit.perPixelDisplacementObjectScaleText);
                 m_MaterialEditor.ShaderProperty(depthOffsetEnable, StylesBaseLit.depthOffsetEnableText);                
                 EditorGUI.indentLevel--;
             }

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitData.hlsl

         float2 minUvSize = GetMinUvSize(layerTexCoord);
         float lod = ComputeTextureLOD(minUvSize);
 
+        // TODO: This should be an uniform for the object, this code should be remove (and is specific to Lit.shader) once we have it. - Workaround for now
+        // Extract scaling from world transform
+#ifdef _PER_PIXEL_DISPLACEMENT_OBJECT_SCALE
+        // 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();
+        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));
+#endif
+
         PerPixelHeightDisplacementParam ppdParam;
 
         float height; // final height processed
 
             float3x3 worldToTangent = input.worldToTangent;
 
+#ifdef _PER_PIXEL_DISPLACEMENT_OBJECT_SCALE
+            //V *= objectScale;
+#endif
+
+
+#ifdef _PER_PIXEL_DISPLACEMENT_OBJECT_SCALE
+            viewDirTS *= 1.0 / objectScale;
+#endif
 
             NdotV = viewDirTS.z;