Shader "Custom/wMaillageShader"
{
	Properties
	{
	   _InnerColor("Inner Color", Color) = (0.0, 0.0, 0.0, 0.5)
	   _RimColor("Rim Color", Color) = (1.0,1.0,1.0,0.5)
	   _RimPower("Rim Power", Range(0.5,8.0)) = 2.47
	}
		SubShader
	{
	  Tags { "Queue" = "Transparent" }
	  Cull Off ZWrite Off ZTest Less
		//Blend based on output Alpha, not color value
		Blend One OneMinusSrcAlpha
		CGPROGRAM
		#pragma surface surf Lambert alpha:fade
		struct Input
		{
			float3 viewDir;
		};
		float4 _InnerColor;
		float4 _RimColor;
		float _RimPower;
		void surf(Input IN, inout SurfaceOutput o)
		{
			half rim = 1.0 - saturate(dot(normalize(IN.viewDir), o.Normal));
			rim = pow(rim, _RimPower);
			//Shift inner color to rim color by rim value adjusted by _InnerColor transparency to reduce its effect
			//on semi-transparent part of rim color the more transparent inner color becomes.
			o.Emission = lerp(_InnerColor.rgb, _RimColor.rgb, saturate(rim + (1 - _InnerColor.a) - (1 - _RimColor.a)));
			o.Alpha = lerp(_InnerColor.a, _RimColor.a, rim);
		}
		ENDCG
	}
		Fallback "Diffuse"
}