SSS: Added thickness map and adjusted settings for Perry head example

SampleScenes/HDTest/GraphicTest/SSS/Materials/SSSHead.mat

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   m_Name: SSSHead
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _MATID_SSS _NORMALMAP _NORMALMAP_TANGENT_SPACE
+  m_ShaderKeywords: _ALBEDOAFFECTEMISSIVE_OFF _ENABLEPERPIXELDISPLACEMENT_OFF _ENABLESPECULAROCCLUSION_OFF
+    _MATID_SSS _NORMALMAP _NORMALMAP_TANGENT_SPACE _SUBSURFACE_RADIUS_MAP _THICKNESSMAP
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
         m_Offset: {x: 0, y: 0}
     - _BaseColorMap:
         m_Texture: {fileID: 2800000, guid: 6e9f830fee2ef0c44af529384a948910, type: 3}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _BentNormalMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _BentNormalMapOS:
+        m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
     - _BumpMap:
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
     - _SubsurfaceRadiusMap:
-        m_Texture: {fileID: 0}
+        m_Texture: {fileID: 2800000, guid: f40319fb453e7e04dbe1e64f7b81efd9, type: 3}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
     - _TangentMap:
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
     - _ThicknessMap:
-        m_Texture: {fileID: 0}
+        m_Texture: {fileID: 2800000, guid: f40319fb453e7e04dbe1e64f7b81efd9, type: 3}
+    - _AlbedoAffectEmissive: 0
     - _AlphaCutoff: 0.5
     - _AlphaCutoffEnable: 0
     - _Anisotropy: 0
     - _EmissiveColorMode: 1
     - _EmissiveIntensity: 0
     - _EnablePerPixelDisplacement: 0
+    - _EnableSpecularOcclusion: 0
     - _EnableWind: 0
     - _GlossMapScale: 1
     - _Glossiness: 0.5
+    - _HeightMax: 1
+    - _HeightMin: -1
     - _HorizonFade: 1
     - _InitialBend: 1
     - _MaterialID: 0
-    - _NormalScale: 1
+    - _NormalScale: 0.776
     - _OcclusionStrength: 1
     - _PPDLodThreshold: 5
     - _PPDMaxSamples: 15
     - _ShiverDrag: 0.2
-    - _Smoothness: 0.497
+    - _Smoothness: 0.542
+    - _SmoothnessRemapMax: 1
+    - _SmoothnessRemapMin: 0
     - _SmoothnessTextureChannel: 0
     - _SpecularHighlights: 1
     - _SrcBlend: 1
     - _SubsurfaceRadius: 1
     - _SurfaceType: 0
     - _TexWorldScale: 1
-    - _Thickness: 1
+    - _Thickness: 0.911
     - _UVBase: 0
     - _UVDetail: 0
     - _UVSec: 0

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SSSProfile/SkinSSSProfile.asset

   m_EditorClassIdentifier: 
   scatteringDistance: {r: 0.758, g: 0.321, b: 0.201, a: 1}
   transmissionTint: {r: 0.7568628, g: 0.32156864, b: 0.20000002, a: 1}
-  texturingMode: 1
-  transmissionMode: 0
-  thicknessRemap: {x: 0, y: 12.031147}
+  texturingMode: 0
+  transmissionMode: 2
+  thicknessRemap: {x: 0, y: 8.152544}
   worldScale: 1
   settingsIndex: 0
   m_ShapeParam: {x: 1.3192612, y: 3.1152647, z: 4.9751244}

SampleScenes/HDTest/GraphicTest/SSS/perry_thickness.png.meta

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+    mipMapFadeDistanceStart: 1
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