SteamVR

Assets/SteamVR/Resources/SteamVR_ClearAll.shader

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+Shader "Custom/SteamVR_ClearAll" {
+	Properties { _MainTex ("Base (RGB)", 2D) = "white" {} }
+
+	CGINCLUDE
+
+	#include "UnityCG.cginc"
+
+	sampler2D _MainTex;
+
+	struct v2f {
+		float4 pos : SV_POSITION;
+		float2 tex : TEXCOORD0;
+	};
+
+	v2f vert(appdata_base v) {
+		v2f o;
+		o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
+		o.tex = v.texcoord;
+		return o;
+	}
+
+	float4 frag(v2f i) : 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
+		}
+	}
+}
+