Shader "MY/FresnelGlow"
{
	Properties
	{
		_color("color", Color) = (1,0.7655172,0,1)
		_exp("exp", Float) = 0.5
	}
		SubShader
	{
		Tags { "IgnoreProjector" = "True" "Queue" = "Transparent+100" "RenderType" = "Transparent" }
		ColorMask RGB
		Pass
		{
			Blend One One
			ZWrite Off

			Fog {Mode Off}
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"

			uniform fixed4 _color;
			uniform fixed _exp;
			struct VertexInput
			{
				half4 vertex : POSITION;
				half3 normal : NORMAL;
			};
			struct VertexOutput
			{
				half4 pos : SV_POSITION;
				half4 posWorld : TEXCOORD0;
				half3 normalDir : TEXCOORD1;
			};
			VertexOutput vert(VertexInput v)
			{
				VertexOutput o;
				o.normalDir = mul(half4(v.normal,0), unity_WorldToObject).xyz;
				o.posWorld = mul(unity_ObjectToWorld, v.vertex);
				o.pos = UnityObjectToClipPos(v.vertex);
				return o;
			}
			fixed4 frag(VertexOutput i) : COLOR
			{
				i.normalDir = normalize(i.normalDir);
				half3 viewDirection = normalize(_WorldSpaceCameraPos.xyz - i.posWorld.xyz);
				half3 normalDirection = i.normalDir;
				fixed3 finalColor = _color.rgb * pow(1.0 - max(0,dot(i.normalDir, viewDirection)) , _exp);
				return fixed4(finalColor,1);
			}
			ENDCG
		}
	}
}