Added new fabirc pbr mode;

Added new stocking surface feature;

Fixed the issue that diffuse bsdf is not energy conserving.
Fixed the bug that shader can not render alpha clip properly;

Runtime/Shaders/Includes/Lighting/UtsLightLoop.hlsl

@@ -53,6 +53,17 @@ bool UtsUseScreenSpaceShadow(DirectionalLightData light, float3 normalWS)
     #endif    
 }
 
+bool IsNonZeroBSDF(float3 L, UtsBSDFData bsdfData)
+{
+#if _MATERIAL_TYPE_FACE
+    return true;
+#else
+    float NdotL = dot(bsdfData.normalWS, L);
+
+    return NdotL > 0.0;
+#endif
+}
+
 void UtsLightLoop(FragInputs fragInputs, PositionInputs posInput, UtsBSDFData bsdfData, BuiltinData builtinData,
     float3 V, uint featureFlags, out LightLoopOutput lightLoopOutput)
 {
@@ -87,6 +98,7 @@ void UtsLightLoop(FragInputs fragInputs, PositionInputs posInput, UtsBSDFData bs
                 float3 L = -light.forward;
 
                 // Is it worth sampling the shadow map?
+                // Should we skip it if NdotL is negative? (i.e. transmission)
                 if ((light.lightDimmer > 0) && (light.shadowDimmer > 0))
                 {
                     context.shadowValue = GetDirectionalShadowAttenuation(context.shadowContext,
@@ -345,6 +357,11 @@ void UtsLightLoop(FragInputs fragInputs, PositionInputs posInput, UtsBSDFData bs
     #endif
     }
 
+    if (HasFlag(bsdfData.surfaceFeatures, SURFACEFEATURE_STOCKING))
+    {
+        UtsEvaluateLighting_Stocking(fragInputs, posInput, bsdfData.normalWS, V, aggregateLighting);
+    }
+
 #ifndef _LIGHT_BASE_RIM_LIGHT_ON
     if (HasFlag(bsdfData.surfaceFeatures, SURFACEFEATURE_RIM_LIGHT))
     {