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/UtsShadowEvaluation.hlsl

@@ -23,7 +23,7 @@ float3 SampleSDFTexture(float3 L, float2 uv, out float angle)
     float2 lightDirection = normalize(L.xz);
     angle = saturate(dot(forwardVector, lightDirection) * -1.0 + _SDFShadowLevel);
     bool isRightSide = dot(lightDirection, leftVector) > 0;
-    
+
     return isRightSide ? right_SDFTex : left_SDFTex;
 }
 
@@ -41,11 +41,11 @@ float GetHairShadow(PositionInputs posInput, float3 L)
         float2 shadowLength = float2(shadowLengthY * 2.0f, shadowLengthY);
 
         float3 cameraDirOS = normalize(TransformWorldToObject(GetCameraPositionWS()));
-        float cameraDirFactor = 1 - smoothstep(0.1, 0.9, cameraDirOS.y);
-        shadowLength.y *= cameraDirFactor;
+        float cameraDirFactor = 1.0 - smoothstep(0.1, 0.9, cameraDirOS.y);
+        // shadowLength.y *= cameraDirFactor;
 
         // TODO: sample point is still shifting when fov change.
-        float2 samplingPoint = (posInput.positionSS + shadowLength * viewLightDir.xy * (_ScreenSize.xy / float2(1920.0f, 1080.0f))) * _ScreenSize.zw; // Use 1080p as the reference resolution to achieve consistent shadow lengths across various screen resolutions.
+        float2 samplingPoint = (posInput.positionSS + shadowLength * viewLightDir.xy) * _ScreenSize.zw; // Use 1080p as the reference resolution to achieve consistent shadow lengths across various screen resolutions.
 
         float2 scaledUVs = samplingPoint * _RTHandleScale.xy; // We have to including the scaling factor for our shadow map since we are not going to allocate new texture if the rendering resolution changed.
         float hairShadow = SAMPLE_TEXTURE2D_SHADOW(_HairShadowTex, s_linear_clamp_compare_sampler, float3(scaledUVs, posInput.deviceDepth + _HairShadowDepthBias)).r;