A depth mask with shadows shader

DepthMaskShadows.shader

Shader "FX/Matte Shadow Mask" {

	Properties{
		_Color("Main Color", Color) = (1,1,1,1)
		_MainTex("Base (RGB) Trans (A)", 2D) = "white" {}
	_Cutoff("Alpha cutoff", Range(0,1)) = 0.5

	}


	SubShader{

		Tags{ "Queue" = "Geometry-10" "IgnoreProjector" = "True" "RenderType" = "TransparentCutout" }
		LOD 200
		Blend Zero SrcColor
		Lighting Off
		ZTest LEqual
		ZWrite On
		ColorMask 0
		Pass{}

		CGPROGRAM
		#pragma surface surf ShadowOnly alphatest:_Cutoff


		fixed4 _Color;

		struct Input {

			float2 uv_MainTex;

		};


	inline fixed4 LightingShadowOnly(SurfaceOutput s, fixed3 lightDir, fixed atten)

	{
		fixed4 c;
		c.rgb = s.Albedo*atten;
		c.a = s.Alpha;
		return c;
	}

	void surf(Input IN, inout SurfaceOutput o) {
		fixed4 c = _Color;
		o.Albedo = c.rgb;
		o.Alpha = 1;
	}
	ENDCG
	}
		Fallback "Transparent/Cutout/VertexLit"
}