gistfile1.txt

Shader "TextureMask"

{

   Properties

   {

      _Mask ("Culling Mask", 2D) = "white" {}

   }

   SubShader

   {

        //Tags {"Queue" = "Background"} 

        //Blend SrcAlpha OneMinusSrcAlpha 
        
        Blend One One


        //Lighting Off 

        //ZWrite On 

        //ZTest Always

        Alphatest LEqual .79

        Pass { 
        	
            SetTexture [_Mask] {combine texture}

        }

   }

}