Merge pull request #605 from Unity-Technologies/Fix-issue-with-ambient-occlusoin-and-transparent

HDRenderPipeline: Fix issue with ambient occlusoin and transparent

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

     // We store inverse AO so neutral is black. So either we sample inside or outside the texture it return 0 in case of neutral
 
     // Ambient occlusion use for indirect lighting (reflection probe, baked diffuse lighting)
+#ifndef _SURFACE_TYPE_TRANSPARENT
+#else
+    float indirectAmbientOcclusion = 1.0;
+    float directAmbientOcclusion = 1.0;
+#endif
 
     // Add indirect diffuse + emissive (if any) - Ambient occlusion is multiply by emissive which is wrong but not a big deal
 #if GTAO_MULTIBOUNCE_APPROX