Shader "xj/Character/Normal" {

     Properties {

         _Color ("Main Color", Color) = (,,,)

         _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}

         _intensity ("Intensity", float ) = 1.0

         _RimColor("RimColor",Color) = (,,,)

         _RimPower ("Rim Power", Range(0.1,8.0)) = 1.0

     }

     SubShader

     {

         LOD

         Tags { "Queue" = "Geometry+500" "RenderType"="Opaque" }

         Pass

         {

             Blend SrcAlpha One

             ZWrite off

             Lighting off

             ztest greater

             CGPROGRAM

             #pragma vertex vert

             #pragma fragment frag

             #include "UnityCG.cginc"

             float4 _RimColor;

             float _RimPower;

             struct appdata_t {

                 float4 vertex : POSITION;

                 float2 texcoord : TEXCOORD0;

                 float4 color:COLOR;

                 float4 normal:NORMAL;

             };

             struct v2f {

                 float4  pos : SV_POSITION;

                 float4  color:COLOR;

             } ;

             v2f vert (appdata_t v)

             {

                 v2f o;

                 o.pos = mul(UNITY_MATRIX_MVP,v.vertex);

                 float3 viewDir = normalize(ObjSpaceViewDir(v.vertex));

                 //视线与法线垂直的部分（点乘为0）即是外轮廓，加重描绘

                 float rim =  - saturate(dot(viewDir,v.normal ));

                 o.color = _RimColor*pow(rim,_RimPower);

                 return o;

             }

             float4 frag (v2f i) : COLOR

             {

                 return i.color;

             }

             ENDCG

         }

         Pass {

             CGPROGRAM

                 #pragma vertex vert

                 #pragma fragment frag

                 #pragma fragmentoption ARB_precision_hint_fastest

                 #include "UnityCG.cginc"

                 struct appdata_t {

                     float4 vertex : POSITION;

                     half2 texcoord : TEXCOORD0;

                 };

                 struct v2f {

                     float4 vertex : SV_POSITION;

                     half2 texcoord : TEXCOORD0;

                 };

                 sampler2D _MainTex;

                 fixed4 _Color;

                 fixed _intensity;

                 v2f vert (appdata_t v)

                 {

                     v2f o;

                     o.vertex = mul(UNITY_MATRIX_MVP,v.vertex);

                     o.texcoord = v.texcoord;

                     return o;

                 }

                 fixed4 frag (v2f i) : SV_Target

                 {

                     fixed4 col = tex2D(_MainTex, i.texcoord) * _Color * _intensity;

                     return col;

                 }

             ENDCG

         }

     }

 }