Unity Shader案例05-------透明遮挡

Shader "CLF/SetPortalMaskShader"
{
	SubShader
	{
		Tags{ "RenderType" = "Opaque" "Queue" = "Geometry-3" }

		ColorMask 0
		ZWrite on

		CGINCLUDE
                #include "UnityCG.cginc"

		struct appdata
	       {
		    float4 vertex : POSITION;
	        };

	        struct v2f
	       {
		    float4 pos : SV_POSITION;
	       };

	       v2f vert(appdata v)
	       {
		    v2f o;
		    o.pos = UnityObjectToClipPos(v.vertex);
		    return o;
	       }

	       half4 frag(v2f i) : SV_Target
	      {
		    return half4(0,0,0,0);
	       }
		ENDCG

	       Pass
	       {
		Stencil
		{
			Ref 1
			Comp always
			Pass replace
		}

		Cull Back
		//Cull Front：朝向摄像机的渲染图元不会渲染。
		//Cull off关闭剔除功能，所有的都会渲染。缺点：需要渲染的数目成倍增加，除非用于特殊效果，建议不开启。

		CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
		ENDCG
	      }
	}
}