Unity3D Shader描边效果

Shader "Custom/RimColor" {
    Properties {
        _MainTex ("Base (RGB)", 2D) = "white" {}
        _RimColor("Rim Color", Color) = (,,,)
        _RimRang("Rim Range",range(,)) = 0.1
    }
 
    SubShader {
 
        Pass
        {
        Cull Front
 
        Tags { "Queue" = "Geometry-1" }
 
        CGPROGRAM
 
        #include "UnityCG.cginc"
 
        struct v2f
        {
            float4 vertex:POSITION;
        };
 
        float4 _RimColor;
        float _RimRang;
 
        v2f vert(appdata_base  v)
        {
            v2f o;
            fixed4 vertex = v.vertex;
            vertex.xyz+=v.normal.xyz*_RimRang;
 
            o.vertex = mul(UNITY_MATRIX_MVP,vertex);    
 
            return o;
        }
 
        fixed4 frag (v2f IN):COLOR
        {
            return _RimColor;
        }
 
        #pragma vertex vert
        #pragma fragment frag
 
        ENDCG
        }
 
        Pass
        {
 
        CGPROGRAM
 
            #include "UnityCG.cginc"
 
            struct v2f
            {
                float4 vertex:POSITION;
                float2 uv:TEXCOORD0;
            };
 
            sampler2D _MainTex;
 
            v2f vert(appdata_base  v)
            {
                v2f o;
                o.uv = v.texcoord;
                o.vertex = mul(UNITY_MATRIX_MVP,v.vertex);
 
                return o;
            }
 
            fixed4 frag (v2f IN):COLOR
            {
 
                fixed4  c =  tex2D(_MainTex, IN.uv);
 
                return c;
            }
 
            #pragma vertex vert
            #pragma fragment frag
 
        ENDCG
        }
    }
    FallBack "Diffuse"
}