Update test scene and UI

SampleScenes/HDTest/Material/HDRenderLoopMaterials/Grid_Planar.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Grid_Planar
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _DOUBLESIDED_ON _ENABLE_TRANSPARENT_FOG
-    _MAPPING_TRIPLANAR _NORMALMAP_TANGENT_SPACE
+  m_ShaderKeywords: _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _DOUBLESIDED_ON _MAPPING_TRIPLANAR
+    _NORMALMAP_TANGENT_SPACE
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/Material/HDRenderLoopMaterials/Grid_Red_0.3x6.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Grid_Red_0.3x6
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _ENABLE_TRANSPARENT_FOG _NORMALMAP_TANGENT_SPACE
+  m_ShaderKeywords: _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _NORMALMAP_TANGENT_SPACE
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/SkyFogTest/Lit_Transparent_Add.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Lit_Transparent_Add
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _BLENDMODE_ADD _ENABLE_TRANSPARENT_FOG
+  m_ShaderKeywords: _BLENDMODE_ADD _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _ENABLE_FOG_ON_TRANSPARENT
     _NORMALMAP_TANGENT_SPACE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/SkyFogTest/Lit_Transparent_Add_NoFog.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Lit_Transparent_Add_NoFog
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _BLENDMODE_ADD _ENABLETRANSPARENTFOG_OFF
+  m_ShaderKeywords: _BLENDMODE_ADD _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _ENABLEFOGONTRANSPARENT_OFF
     _NORMALMAP_TANGENT_SPACE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 0
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 0

SampleScenes/HDTest/SkyFogTest/Lit_Transparent_Alpha.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Lit_Transparent_Alpha
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _BLENDMODE_ALPHA _ENABLE_TRANSPARENT_FOG
+  m_ShaderKeywords: _BLENDMODE_ALPHA _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _ENABLE_FOG_ON_TRANSPARENT
     _NORMALMAP_TANGENT_SPACE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/SkyFogTest/Lit_Transparent_Multiply.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Lit_Transparent_Multiply
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _BLENDMODE_MULTIPLY _ENABLE_TRANSPARENT_FOG
+  m_ShaderKeywords: _BLENDMODE_MULTIPLY _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _ENABLE_FOG_ON_TRANSPARENT
     _NORMALMAP_TANGENT_SPACE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/SkyFogTest/Lit_Transparent_PreMultipliedAlpha.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Lit_Transparent_PreMultipliedAlpha
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _BLENDMODE_PRE_MULTIPLY _ENABLE_TRANSPARENT_FOG
-    _NORMALMAP_TANGENT_SPACE _SURFACE_TYPE_TRANSPARENT
+  m_ShaderKeywords: _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _BLENDMODE_PRE_MULTIPLY
+    _ENABLE_FOG_ON_TRANSPARENT _NORMALMAP_TANGENT_SPACE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/SkyFogTest/Rough_Refraction_Transparent.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Rough_Refraction_Transparent
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _BLENDMODE_ALPHA _ENABLE_TRANSPARENT_FOG
+  m_ShaderKeywords: _BLENDMODE_ALPHA _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _ENABLE_FOG_ON_TRANSPARENT
     _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKPLANE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/SkyFogTest/Rough_Refraction_Transparent_No_Fog.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Rough_Refraction_Transparent_No_Fog
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _BLENDMODE_ALPHA _NORMALMAP_TANGENT_SPACE
-    _REFRACTION_THICKPLANE _SURFACE_TYPE_TRANSPARENT
+  m_ShaderKeywords: _BLENDMODE_ALPHA _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _ENABLEFOGONTRANSPARENT_OFF
+    _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKPLANE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 0
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 0

SampleScenes/HDTest/SkyFogTest/Unlit_Transparent_Add.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Unlit_Transparent_Add
   m_Shader: {fileID: 4800000, guid: c4edd00ff2db5b24391a4fcb1762e459, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ADD _ENABLE_TRANSPARENT_FOG _SURFACE_TYPE_TRANSPARENT
+  m_ShaderKeywords: _BLENDMODE_ADD _ENABLE_FOG_ON_TRANSPARENT _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableFog: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/SkyFogTest/Unlit_Transparent_Add_NoFog.mat

     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableFog: 0
+    - _EnableFogOnTransparent: 0
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 0

SampleScenes/HDTest/SkyFogTest/Unlit_Transparent_Alpha.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Unlit_Transparent_Alpha
   m_Shader: {fileID: 4800000, guid: c4edd00ff2db5b24391a4fcb1762e459, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ALPHA _ENABLE_TRANSPARENT_FOG _SURFACE_TYPE_TRANSPARENT
+  m_ShaderKeywords: _BLENDMODE_ALPHA _ENABLE_FOG_ON_TRANSPARENT _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableFog: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/SkyFogTest/Unlit_Transparent_Multiply.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Unlit_Transparent_Multiply
   m_Shader: {fileID: 4800000, guid: c4edd00ff2db5b24391a4fcb1762e459, type: 3}
-  m_ShaderKeywords: _BLENDMODE_MULTIPLY _ENABLE_TRANSPARENT_FOG _SURFACE_TYPE_TRANSPARENT
+  m_ShaderKeywords: _BLENDMODE_MULTIPLY _ENABLE_FOG_ON_TRANSPARENT _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableFog: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

SampleScenes/HDTest/SkyFogTest/Unlit_Transparent_PreMultipliedAlpha.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Unlit_Transparent_PreMultipliedAlpha
   m_Shader: {fileID: 4800000, guid: c4edd00ff2db5b24391a4fcb1762e459, type: 3}
-  m_ShaderKeywords: _BLENDMODE_PRE_MULTIPLY _ENABLE_TRANSPARENT_FOG _SURFACE_TYPE_TRANSPARENT
+  m_ShaderKeywords: _BLENDMODE_PRE_MULTIPLY _ENABLE_FOG_ON_TRANSPARENT _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableFog: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1

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

             public static string InputsText = "Inputs";
 
             public static GUIContent baseColorText = new GUIContent("Base Color + Opacity", "Albedo (RGB) and Opacity (A)");
-            public static GUIContent baseColorSmoothnessText = new GUIContent("Base Color + Smoothness", "Albedo (RGB) and Smoothness (A)");
+            public static GUIContent baseColorRefractionMaskText = new GUIContent("Base Color + RefractionMask", "Albedo (RGB) and Refraction mask (A)");
 
             public static GUIContent smoothnessMapChannelText = new GUIContent("Smoothness Source", "Smoothness texture and channel");
             public static GUIContent metallicText = new GUIContent("Metallic", "Metallic scale factor");
 
             EditorGUI.indentLevel++;
 
-            m_MaterialEditor.TexturePropertySingleLine(Styles.baseColorText, baseColorMap[layerIndex], baseColor[layerIndex]);
+            bool refractionEnable = refractionMode.floatValue > 0.0f && preRefractionPass.floatValue == 0.0f;
+
+            m_MaterialEditor.TexturePropertySingleLine(refractionEnable ? Styles.baseColorRefractionMaskText : Styles.baseColorText, baseColorMap[layerIndex], baseColor[layerIndex]);
 
             if ( materialID == null || // Will be the case for Layered materials where we only support standard and the parameter does not exist
                 (Lit.MaterialId)materialID.floatValue == Lit.MaterialId.LitStandard || (Lit.MaterialId)materialID.floatValue == Lit.MaterialId.LitAniso)

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/DefaultHDMaterial.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: DefaultHDMaterial
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _BLENDMODE_ACCURATE_LIGHTING _ENABLE_TRANSPARENT_FOG _NORMALMAP_TANGENT_SPACE
+  m_ShaderKeywords: _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _NORMALMAP_TANGENT_SPACE
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnableBlendModeAccurateLighting: 1
+    - _EnableBlendModePreserveSpecularLighting: 1
+    - _EnableFogOnTransparent: 1
     - _EnablePerPixelDisplacement: 0
     - _EnableSpecularOcclusion: 0
     - _EnableTransparentFog: 1