Merge remote-tracking branch 'refs/remotes/origin/master' into Update-SSS

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

     [branch] if (bsdfData.enableTransmission)
     {
         // Use the reversed normal from the front for the back of the object.
-        illuminance = F_Transm_Schlick(bsdfData.fresnel0, saturate(-NdotL));
+        illuminance = F_Transm_Schlick(bsdfData.fresnel0.x, saturate(-NdotL));  // Transmission is only valid for dielectric
 
         // For low thickness, we can reuse the shadowing status for the back of the object.
         shadow       = bsdfData.useThinObjectMode ? shadow : 1;
     [branch] if (bsdfData.enableTransmission)
     {
         // Use the reversed normal from the front for the back of the object.
-        illuminance = F_Transm_Schlick(bsdfData.fresnel0, saturate(-NdotL)) * attenuation;
+        illuminance = F_Transm_Schlick(bsdfData.fresnel0.x , saturate(-NdotL)) * attenuation;  // Transmission is only valid for dielectric
 
         // For low thickness, we can reuse the shadowing status for the back of the object.
         shadow       = bsdfData.useThinObjectMode ? shadow : 1;
     [branch] if (bsdfData.enableTransmission)
     {
         // Use the reversed normal from the front for the back of the object.
-        illuminance = F_Transm_Schlick(bsdfData.fresnel0, saturate(-NdotL)) * clipFactor;
+        illuminance = F_Transm_Schlick(bsdfData.fresnel0.x, saturate(-NdotL)) * clipFactor; // Transmission is only valid for dielectric
 
         // For low thickness, we can reuse the shadowing status for the back of the object.
         shadow       = bsdfData.useThinObjectMode ? shadow : 1;

Assets/ScriptableRenderPipeline/HDRenderPipeline/SceneSettings/Resources/DrawTransmittanceGraph.shader

             //-------------------------------------------------------------------------------------
 
             float4 _VolumeAlbedo, _VolumeShapeParam, _ThicknessRemap;
-            float _ScatteringDistance; // See 'SubsurfaceScatteringProfile'
 
             //-------------------------------------------------------------------------------------
             // Implementation

Assets/ScriptableRenderPipeline/ShaderLibrary/BSDF.hlsl

 
 float F_Transm_Schlick(float f0, float u)
 {
-    return F_Schlick(f0, 1.0, u); // sub mul mul mul sub mad
+    return F_Transm_Schlick(f0, 1.0, u); // sub mul mul mul sub mad
 }
 
 float3 F_Schlick(float3 f0, float f90, float u)