RimLighting.shader

Shader "Custom/RimLighting" {
	Properties{
		_MainTex("Texture", 2D) = "white"{}
		_RimWidth("RimWidth", Range(0.5, 5.0)) = 2.0
			_Color("Color", Color) = (1, 1, 1, 0)
	}
	SubShader{
			Pass{
				CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"

				sampler2D _MainTex;
				float _RimWidth;
				float4 _Color;
				float4 _MainTex_ST;

				struct v2f
				{
					float4 pos : POSITION;
					float3 viewDir : Any;
					float3 normal : NORMAL;
					float2 texcoord : TEXCOORD0;
				};

				v2f vert(appdata_base v)
				{
					v2f o;
					o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
					o.viewDir = normalize(WorldSpaceViewDir(v.vertex));
					o.normal = normalize(v.normal);
					o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
					return o;
				}

				float4 frag(v2f i) : COLOR{
					half rim = 1.0 - saturate(dot(i.normal, i.viewDir));
					float3 col = _Color.rgb*pow(rim, _RimWidth);
						col = (col + tex2D(_MainTex, i.texcoord)) / 2;
					return float4(col, _Color.a);
				}
					ENDCG
			}
		}
}