SteamVR

Assets/SteamVR/Resources/SteamVR_HiddenArea.shader

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+Shader "Custom/SteamVR_HiddenArea" {
+
+	CGINCLUDE
+
+	#include "UnityCG.cginc"
+
+	float4 vert(appdata_base v) : SV_POSITION { return v.vertex; }
+	float4 frag(float4 v : SV_POSITION) : COLOR { return float4(0,0,0,0); }
+
+	ENDCG
+
+	SubShader {
+		Tags { "Queue" = "Background" }
+		Pass {
+			ZTest Always Cull Off ZWrite On
+			Fog { Mode Off }
+
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			ENDCG
+		}
+	}
+}