Normal Masking

Shader "Normal Masking" {
	Properties {
		_Col1 ("Color 1", Color) = (1,1,1,1)
		_Col2 ("Color 2", Color) = (0,0,0,1)
	}
	SubShader {
	 Tags { "RenderType" = "Opaque" }
	 CGPROGRAM
	 #pragma surface surf Lambert
	 struct Input {
		 float4 color : COLOR;
		 float3 worldNormal;
	 };
	 float3 _Col1;
	 float3 _Col2;
	 void surf (Input i, inout SurfaceOutput o) {
		 float3 normal = i.worldNormal;
		 float normalMask = normal.x + normal.y + normal.z;
		 o.Emission = _Col1 * normalMask + _Col2 * (1-normalMask);
	 }
	 ENDCG
   }
   Fallback "Diffuse"
 }