HideAllWithin.shader

Shader "LyumaShader/HideAllWithin" {
    Properties {
    }
    SubShader {
        Tags { "RenderType"="Opaque" "Queue" = "Transparent+2000"}
        Cull Back
        // To test: ColorMask R
        ColorMask 0
        ZTest Always
        ZWrite On

        Pass {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            // make fog work
            #pragma multi_compile_fog

            #include "UnityCG.cginc"

            struct appdata {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };
            v2f vert (appdata v) {
                v2f o;
                float4 objCamPos = mul(unity_WorldToObject, _WorldSpaceCameraPos);
                o.vertex = UnityObjectToClipPos(v.vertex);
                float3 objCamPosAbs = abs(objCamPos.xyz);
                if (all(objCamPosAbs < 1.)) {
                    o.vertex = float4(4.*saturate(v.vertex.xy)-1., 0., 1.);
                }
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target {
                // ColorMask 0 causes frag to be ignored.
                fixed4 col = float4(1.,1.,1.,1.);
                return col;
            }
            ENDCG
        }
    }
}