Cut away test 3.shader

Shader "Custom/Cutaway Test 3" {
	Properties{
		_Color("Color", Color) = (1,1,1,1)
		_MainTex("Albedo (RGB)", 2D) = "white" {}
		_Glossiness("Smoothness", Range(0,1)) = 0.5
		_Metallic("Metallic", Range(0,1)) = 0.0
		_InternalColor("Internal Color", Color) = (1,1,1,1)
		_CutAwayOffset("Cut Away Offset", Range(0,4)) = 0.5
	}
	SubShader{
	Tags{ "RenderType" = "Opaque" }
	LOD 200
	Cull Off

	CGPROGRAM
	// Physically based Standard lighting model, and enable shadows on all light types
	#pragma surface surf Standard fullforwardshadows
	// Use shader model 3.0 target, to get nicer looking lighting
	#pragma target 3.0
	sampler2D _MainTex;
	half _Glossiness;
	half _Metallic;
	half _CutAwayOffset;
	fixed4 _Color;
	fixed4 _InternalColor;
	struct Input {
		float2 uv_MainTex;
		float3 worldPos;
		fixed facing : VFACE;
	};

	void surf(Input IN, inout SurfaceOutputStandard o) {
		clip((-IN.worldPos.y + _CutAwayOffset));

		if (IN.facing > 0) // front face
		{
			// Albedo comes from a texture tinted by color
			fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
			o.Albedo = c.rgb;
			// Metallic and smoothness come from slider variables
			o.Metallic = _Metallic;
			o.Smoothness = _Glossiness;
			o.Alpha = c.a;
		}
		else // backface
		{
			o.Emission = _InternalColor;
		}
	}
	ENDCG
	}
		FallBack "Diffuse"
}