Shader "Custom/URP/SeeThroughSurfaces1"
{
    SubShader
    {
        Tags
        {
            "RenderPipeline"="UniversalRenderPipeline"
            "RenderType"="Opaque"
            "Queue"="Geometry+1"
        }

        ColorMask 0
        ZWrite Off

        Stencil
        {
            Ref 1
            Comp Always
            Pass Replace
        }

        Pass
        {
            Name "ForwardLitStencil"
            Tags { "LightMode" = "UniversalForward" }

            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"

            struct Attributes
            {
                float3 positionOS : POSITION;
            };

            struct Varyings
            {
                float4 positionHCS : SV_POSITION;
            };

            Varyings vert(Attributes IN)
            {
                Varyings OUT;
                OUT.positionHCS = TransformObjectToHClip(IN.positionOS);
                return OUT;
            }

            half4 frag(Varyings IN) : SV_Target
            {
                // No dibuja nada, solo stencil
                return half4(1,1,0,1);
            }
            ENDHLSL
        }
    }
}