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Assets/Oculus/VR/Resources/Underlay Transparent Occluder.shader

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+/*
+Code for transparent object in front of the overlay
+The keepalpha option is important to let unity maintain the alpha we return from the shader
+*/
+
+Shader "Oculus/Underlay Transparent Occluder" {
+    Properties{
+        _Color("Main Color", Color) = (1,1,1,1)
+        _MainTex("Base (RGB) Trans (A)", 2D) = "white" {}
+    }
+        SubShader{
+        Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" }
+        Blend SrcAlpha OneMinusSrcAlpha
+
+        // extra pass that renders to depth buffer only
+        Pass{
+            ZWrite On
+            ColorMask 0
+        }
+
+        CGPROGRAM
+        #pragma surface surf Lambert keepalpha
+            fixed4 _Color;
+        struct Input {
+            float4 color : COLOR;
+        };
+        void surf(Input IN, inout SurfaceOutput o) {
+            o.Albedo = _Color.rgb;
+            o.Alpha = _Color.a;
+        }
+        ENDCG
+    }
+
+
+        Fallback "Transparent/VertexLit"
+}