Revert unnecessary changes.

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

         protected MaterialProperty supportDBuffer = null;
         protected const string kSupportDBuffer = "_SupportDBuffer";
 
-        protected virtual MaterialId defaultMaterialID { get { return MaterialId.LitStandard; } }
-
         protected override void FindBaseMaterialProperties(MaterialProperty[] props)
         {
             base.FindBaseMaterialProperties(props);

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/LitDataIndividualLayer.hlsl

 {
     float alpha = SAMPLE_UVMAPPING_TEXTURE2D(ADD_IDX(_BaseColorMap), ADD_ZERO_IDX(sampler_BaseColorMap), ADD_IDX(layerTexCoord.base)).a * ADD_IDX(_BaseColor).a;
 
-#ifndef ALPHA_USED_AS_SMOOTHNESS
-    #if defined(_ALPHATEST_ON) && !defined(LAYERED_LIT_SHADER)
-        float alphaCutoff = _AlphaCutoff;
-        #ifdef CUTOFF_TRANSPARENT_DEPTH_PREPASS
-        alphaCutoff = _AlphaCutoffPrepass;
-        #elif defined(CUTOFF_TRANSPARENT_DEPTH_POSTPASS)
-        alphaCutoff = _AlphaCutoffPostpass;
-        #endif
-        DoAlphaTest(alpha, alphaCutoff);
+#if defined(_ALPHATEST_ON) && !defined(LAYERED_LIT_SHADER)
+    float alphaCutoff = _AlphaCutoff;
+    #ifdef CUTOFF_TRANSPARENT_DEPTH_PREPASS
+    alphaCutoff = _AlphaCutoffPrepass;
+    #elif defined(CUTOFF_TRANSPARENT_DEPTH_POSTPASS)
+    alphaCutoff = _AlphaCutoffPostpass;
-    surfaceData.perceptualSmoothness = 1;
-#else
-    surfaceData.perceptualSmoothness = alpha;
-    alpha = 1;
+    DoAlphaTest(alpha, alphaCutoff);
 #endif
 
     float3 detailNormalTS = float3(0.0, 0.0, 0.0);
     bentNormalTS = ADD_IDX(GetBentNormalTS)(input, layerTexCoord, normalTS, detailNormalTS, detailMask);
 
 #if defined(_MASKMAP_IDX)
-    surfaceData.perceptualSmoothness *= SAMPLE_UVMAPPING_TEXTURE2D(ADD_IDX(_MaskMap), SAMPLER_MASKMAP_IDX, ADD_IDX(layerTexCoord.base)).a;
+    surfaceData.perceptualSmoothness = SAMPLE_UVMAPPING_TEXTURE2D(ADD_IDX(_MaskMap), SAMPLER_MASKMAP_IDX, ADD_IDX(layerTexCoord.base)).a;
-    surfaceData.perceptualSmoothness *= ADD_IDX(_Smoothness);
+    surfaceData.perceptualSmoothness = ADD_IDX(_Smoothness);
 #endif
 
 #ifdef _DETAIL_MAP_IDX