Remove subsurface related properties.

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Material/LayeredLit/TerrainLitUI.cs

 
                 CoreUtils.SetKeyword(material, "_HEIGHTMAP" + i, material.GetTexture(kHeightMap + i));
 
-                CoreUtils.SetKeyword(material, "_SUBSURFACE_MASK_MAP" + i, material.GetTexture(kSubsurfaceMaskMap + i));
                 CoreUtils.SetKeyword(material, "_THICKNESSMAP" + i, material.GetTexture(kThicknessMap + i));
             }
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/LayeredLit/TerrainLit.shader

         _DiffusionProfile2("Diffusion Profile2", Int) = 0
         _DiffusionProfile3("Diffusion Profile3", Int) = 0
 
-        _SubsurfaceMask0("Subsurface Mask0", Range(0.0, 1.0)) = 1.0
-        _SubsurfaceMask1("Subsurface Mask1", Range(0.0, 1.0)) = 1.0
-        _SubsurfaceMask2("Subsurface Mask2", Range(0.0, 1.0)) = 1.0
-        _SubsurfaceMask3("Subsurface Mask3", Range(0.0, 1.0)) = 1.0
-
-        _SubsurfaceMaskMap0("Subsurface Mask Map0", 2D) = "white" {}
-        _SubsurfaceMaskMap1("Subsurface Mask Map1", 2D) = "white" {}
-        _SubsurfaceMaskMap2("Subsurface Mask Map2", 2D) = "white" {}
-        _SubsurfaceMaskMap3("Subsurface Mask Map3", 2D) = "white" {}
-
         _Thickness0("Thickness", Range(0.0, 1.0)) = 1.0
         _Thickness1("Thickness", Range(0.0, 1.0)) = 1.0
         _Thickness2("Thickness", Range(0.0, 1.0)) = 1.0
     #pragma shader_feature _HEIGHTMAP1
     #pragma shader_feature _HEIGHTMAP2
     #pragma shader_feature _HEIGHTMAP3
-    #pragma shader_feature _SUBSURFACE_MASK_MAP0
-    #pragma shader_feature _SUBSURFACE_MASK_MAP1
-    #pragma shader_feature _SUBSURFACE_MASK_MAP2
-    #pragma shader_feature _SUBSURFACE_MASK_MAP3
     #pragma shader_feature _THICKNESSMAP0
     #pragma shader_feature _THICKNESSMAP1
     #pragma shader_feature _THICKNESSMAP2

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/LayeredLit/TerrainLitData.hlsl

 #define SAMPLER_HEIGHTMAP_IDX sampler_HeightMap3
 #endif
 
-#if defined(_SUBSURFACE_MASK_MAP0)
-#define SAMPLER_SUBSURFACE_MASK_MAP_IDX sampler_SubsurfaceMaskMap0
-#elif defined(_SUBSURFACE_MASK_MAP1)
-#define SAMPLER_SUBSURFACE_MASK_MAP_IDX sampler_SubsurfaceMaskMap1
-#elif defined(_SUBSURFACE_MASK_MAP2)
-#define SAMPLER_SUBSURFACE_MASK_MAP_IDX sampler_SubsurfaceMaskMap2
-#elif defined(_SUBSURFACE_MASK_MAP3)
-#define SAMPLER_SUBSURFACE_MASK_MAP_IDX sampler_SubsurfaceMaskMap3
-#endif
-
 #if defined(_THICKNESSMAP0)
 #define SAMPLER_THICKNESSMAP_IDX sampler_ThicknessMap0
 #elif defined(_THICKNESSMAP1)
 #endif
 #ifdef _NORMALMAP_TANGENT_SPACE0
 #define _NORMALMAP_TANGENT_SPACE_IDX
-#endif
-#ifdef _SUBSURFACE_MASK_MAP0
-#define _SUBSURFACE_MASK_MAP_IDX
 #endif
 #ifdef _THICKNESSMAP0
 #define _THICKNESSMAP_IDX
 #undef ADD_IDX
 #undef _NORMALMAP_IDX
 #undef _NORMALMAP_TANGENT_SPACE_IDX
-#undef _SUBSURFACE_MASK_MAP_IDX
 #undef _THICKNESSMAP_IDX
 #undef _MASKMAP_IDX
 #undef _BENTNORMALMAP_IDX
 #endif
 #ifdef _NORMALMAP_TANGENT_SPACE1
 #define _NORMALMAP_TANGENT_SPACE_IDX
-#endif
-#ifdef _SUBSURFACE_MASK_MAP1
-#define _SUBSURFACE_MASK_MAP_IDX
 #endif
 #ifdef _THICKNESSMAP1
 #define _THICKNESSMAP_IDX
 #undef ADD_IDX
 #undef _NORMALMAP_IDX
 #undef _NORMALMAP_TANGENT_SPACE_IDX
-#undef _SUBSURFACE_MASK_MAP_IDX
 #undef _THICKNESSMAP_IDX
 #undef _MASKMAP_IDX
 #undef _BENTNORMALMAP_IDX
 #ifdef _NORMALMAP_TANGENT_SPACE2
 #define _NORMALMAP_TANGENT_SPACE_IDX
 #endif
-#ifdef _SUBSURFACE_MASK_MAP2
-#define _SUBSURFACE_MASK_MAP_IDX
-#endif
 #ifdef _THICKNESSMAP2
 #define _THICKNESSMAP_IDX
 #endif
 #undef ADD_IDX
 #undef _NORMALMAP_IDX
 #undef _NORMALMAP_TANGENT_SPACE_IDX
-#undef _SUBSURFACE_MASK_MAP_IDX
 #undef _THICKNESSMAP_IDX
 #undef _MASKMAP_IDX
 #undef _BENTNORMALMAP_IDX
 #ifdef _NORMALMAP_TANGENT_SPACE3
 #define _NORMALMAP_TANGENT_SPACE_IDX
 #endif
-#ifdef _SUBSURFACE_MASK_MAP3
-#define _SUBSURFACE_MASK_MAP_IDX
-#endif
 #ifdef _THICKNESSMAP3
 #define _THICKNESSMAP_IDX
 #endif
 #undef ADD_IDX
 #undef _NORMALMAP_IDX
 #undef _NORMALMAP_TANGENT_SPACE_IDX
-#undef _SUBSURFACE_MASK_MAP_IDX
 #undef _THICKNESSMAP_IDX
 #undef _MASKMAP_IDX
 #undef _BENTNORMALMAP_IDX
     surfaceData.ambientOcclusion = SURFACEDATA_BLEND_SCALAR(surfaceData, ambientOcclusion, weights);
     surfaceData.metallic = SURFACEDATA_BLEND_SCALAR(surfaceData, metallic, weights);
     surfaceData.tangentWS = normalize(input.worldToTangent[0].xyz); // The tangent is not normalize in worldToTangent for mikkt. Tag: SURFACE_GRADIENT
-    surfaceData.subsurfaceMask = SURFACEDATA_BLEND_SCALAR(surfaceData, subsurfaceMask, weights);
+    surfaceData.subsurfaceMask = 0;
     surfaceData.thickness = SURFACEDATA_BLEND_SCALAR(surfaceData, thickness, weights);
     surfaceData.diffusionProfile = SURFACEDATA_BLEND_DIFFUSION_PROFILE(surfaceData, diffusionProfile, weights);