Fix SSAO with double sided material and normal mode to none #1043

Author: FrancescoC-unity

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -62,6 +62,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed AxF handling of roughness for Blinn-Phong type materials
 - Fixed AxF UI errors when surface type is switched to transparent
 - Fix issue that caused sky to incorrectly render when using a custom projection matrix.
+- Fixed issue with completely black AO on double sided materials when normal mode is set to None.
 
 ### Changed
 - Shadowmask and realtime reflection probe property are hide in Quality settings

com.unity.render-pipelines.high-definition/Runtime/Lighting/ScreenSpaceLighting/GTAO.compute

@@ -214,7 +214,7 @@ void GTAO_KERNEL_NAME(uint3 dispatchThreadId : SV_DispatchThreadID)
 
     integral /= dirCount;
 
-    if (currDepth == UNITY_RAW_FAR_CLIP_VALUE)
+    if (currDepth == UNITY_RAW_FAR_CLIP_VALUE || integral < -1e-2f)
     {
         integral = 1;
     }