DeltaVR3DModelGeneration/Assets/_PROJECT/Components/Portals2/StencilPortalShader.shader

Shader "Unlit/StencilPortalShader"
{
    Properties
    {
        [IntRange] _StencilID("Stencil ID", Range(1, 255)) = 1
    }

    SubShader
    {
        Tags
        {
            "RenderType" = "Opaque"
            "Queue" = "Geometry"
            "RenderPipeline" = "UniversalPipeline"
        }

        Pass
        {
            Blend Zero One
            ZWrite Off
            Cull Off // turn off backface culling

            Stencil
            {
                Ref[_StencilID]
                Comp Always
                Pass Replace
                Fail Keep
            }

            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;

                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;

                UNITY_VERTEX_INPUT_INSTANCE_ID
                UNITY_VERTEX_OUTPUT_STEREO
            };


            v2f vert(appdata v)
            {
                v2f o;
                UNITY_SETUP_INSTANCE_ID(v);
                UNITY_INITIALIZE_OUTPUT(v2f, o);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);

                o.vertex = UnityObjectToClipPos(v.vertex);
                return o;
            }

            fixed4 frag(v2f i) : SV_Target
            {
                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);

                return float4(0.0, 1.0, 0.0, 1.0);
            }
            ENDCG
        }
    }
}