unity简单shader实现物体描边效果

最近工作中突然有描边的小功能，就写了一个shader收藏，顺便分享下，不喜勿喷，欢迎建议，谢谢！

Shader "Unlit/TraceOutLine"
{
    Properties
    {
         //属性
        _MainTex("Texture", 2D) = "white" {}
        _Diffuse("Color",Color) = (1,1,1,1)
        _OutLineColor("OutlineColor",Color) = (1,1,1,1)
        _Outline("Outline",Range(0,1)) = 1
    }
        SubShader
        {
            //描边shader渲染方式
            Tags {"Queue" = "Geometry+1000" "RenderType" = "Opaque" }
            Pass
            {
                 Cull Front
                 CGPROGRAM
                 #pragma vertex vert 
                 #pragma fragment frag 
                 #include "UnityCG.cginc"
                 float4 _OutLineColor;
                 float _Outline;
                 struct v2f
                 {
                     float4 vertex:SV_POSITION;
                 };

                 v2f vert(appdata_base v)
                 {
                     v.vertex.xyz += normalize(v.normal) * _Outline / 10;

                     v2f o;
                     o.vertex = UnityObjectToClipPos(v.vertex);
                     return o;
                 };

                 fixed4  frag(v2f i) :SV_TARGET
                 {
                     return fixed4(_OutLineColor);
                 };

                 ENDCG
             }

             Pass
             {
                 Tags { "LightModel" = "ForwardBase" }
                //开启CG代码
                 CGPROGRAM
                //编写指令
                 #pragma vertex vert
                 #pragma fragment frag 
                 #include "UnityCG.cginc"
                 #include "Lighting.cginc"

                 sampler2D _MainTex;
                 float4 _MainTex_ST;
                 float4 _Diffuse;

                 struct v2f
                 {
                     float4 vertex:SV_POSITION;
                     float2 uv:TEXCOORD0;
                     float3 worldLightNormal:TEXCOORD1;
                     float3 worldNormal:TEXCOORD2;


                 };

                 v2f vert(appdata_base v)
                 {
                     v2f o;
                     o.vertex = UnityObjectToClipPos(v.vertex);
                     o.uv = TRANSFORM_TEX(v.texcoord,_MainTex);
                     float3 worldPos = mul(unity_ObjectToWorld,v.vertex);
                     o.worldLightNormal = UnityWorldSpaceLightDir(worldPos);
                     o.worldNormal = UnityObjectToWorldNormal(v.normal);
                     return o;
                 };

                 fixed4 frag(v2f i) :SV_TARGET
                 {
                     float3 worldNormalDir = normalize(i.worldNormal);
                     float3 WorldLightDir = normalize(i.worldLightNormal);

                     float3 texColor = tex2D(_MainTex,i.uv);

                     float ambient = UNITY_LIGHTMODEL_AMBIENT.rgb * texColor.rgb;

                     float3 diffuse = _LightColor0.rgb * _Diffuse.rgb * texColor.rgb * (dot(worldNormalDir,WorldLightDir) * 0.5 + 0.5);
                     float3 color = diffuse + ambient;

                     return fixed4(color,1);
                 };

                 ENDCG

             }

        }
            Fallback "Diffuse"
}