shader知识：

最终效果

Shader "Learning Unity Shader/Lecture 14/Basic Rim Shader"  {      //-----------------------------------【属性 || Properties】------------------------------------------       Properties      {          //主颜色 || Main Color          _MainColor("【主颜色】Main Color", Color) = (0.5,0.5,0.5,1)          //漫反射纹理 || Diffuse Texture          _TextureDiffuse("【漫反射纹理】Texture Diffuse", 2D) = "white" {}           //边缘发光颜色 || Rim Color          _RimColor("【边缘发光颜色】Rim Color", Color) = (0.5,0.5,0.5,1)          //边缘发光强度 ||Rim Power          _RimPower("【边缘发光强度】Rim Power", Range(0.0, 36)) = 0.1          //边缘发光强度系数 || Rim Intensity Factor          _RimIntensity("【边缘发光强度系数】Rim Intensity", Range(0.0, 100)) = 3      }         //----------------------------------【子着色器 || SubShader】---------------------------------------       SubShader      {          //渲染类型为Opaque，不透明 || RenderType Opaque          Tags          {              "RenderType" = "Opaque"         }             //---------------------------------------【唯一的通道 || Pass】------------------------------------          Pass          {              //设定通道名称 || Set Pass Name              Name "ForwardBase"                //设置光照模式 || LightMode ForwardBase              Tags              {                  "LightMode" = "ForwardBase"             }                 //-------------------------开启CG着色器编程语言段 || Begin CG Programming Part----------------------               CGPROGRAM                     //【1】指定顶点和片段着色函数名称 || Set the name of vertex and fragment shader function                  #pragma vertex vert                  #pragma fragment frag                     //【2】头文件包含 || include                  #include "UnityCG.cginc"                  #include "AutoLight.cginc"                     //【3】指定Shader Model 3.0 || Set Shader Model 3.0                  #pragma target 3.0                     //【4】变量声明 || Variable Declaration                  //系统光照颜色                  uniform float4 _LightColor0;                  //主颜色                  uniform float4 _MainColor;                  //漫反射纹理                  uniform sampler2D _TextureDiffuse;                   //漫反射纹理_ST后缀版                  uniform float4 _TextureDiffuse_ST;                  //边缘光颜色                  uniform float4 _RimColor;                  //边缘光强度                  uniform float _RimPower;                  //边缘光强度系数                  uniform float _RimIntensity;                     //【5】顶点输入结构体 || Vertex Input Struct                  struct VertexInput                   {                      //顶点位置 || Vertex position                      float4 vertex : POSITION;                      //法线向量坐标 || Normal vector coordinates                      float3 normal : NORMAL;                      //一级纹理坐标 || Primary texture coordinates                      float4 texcoord : TEXCOORD0;                  };                     //【6】顶点输出结构体 || Vertex Output Struct                  struct VertexOutput                   {                      //像素位置 || Pixel position                      float4 pos : SV_POSITION;                      //一级纹理坐标 || Primary texture coordinates                      float4 texcoord : TEXCOORD0;                      //法线向量坐标 || Normal vector coordinates                      float3 normal : NORMAL;                      //世界空间中的坐标位置 || Coordinate position in world space                      float4 posWorld : TEXCOORD1;                      //创建光源坐标,用于内置的光照 || Function in AutoLight.cginc to create light coordinates                      LIGHTING_COORDS(3,4)                  };                     //【7】顶点着色函数 || Vertex Shader Function                  VertexOutput vert(VertexInput v)                   {                      //【1】声明一个顶点输出结构对象 || Declares a vertex output structure object                      VertexOutput o;                         //【2】填充此输出结构 || Fill the output structure                      //将输入纹理坐标赋值给输出纹理坐标                      o.texcoord = v.texcoord;                      //获取顶点在世界空间中的法线向量坐标                       o.normal = mul(float4(v.normal,0), _World2Object).xyz;                      //获得顶点在世界空间中的位置坐标                       o.posWorld = mul(_Object2World, v.vertex);                      //获取像素位置                      o.pos = mul(UNITY_MATRIX_MVP, v.vertex);                         //【3】返回此输出结构对象  || Returns the output structure                      return o;                  }                     //【8】片段着色函数 || Fragment Shader Function                  fixed4 frag(VertexOutput i) : COLOR                  {                      //【8.1】方向参数准备 || Direction                      //视角方向                      float3 ViewDirection = normalize(_WorldSpaceCameraPos.xyz - i.posWorld.xyz);                      //法线方向                      float3 Normalection = normalize(i.normal);                      //光照方向                      float3 LightDirection = normalize(_WorldSpaceLightPos0.xyz);                         //【8.2】计算光照的衰减 || Lighting attenuation                      //衰减值                      float Attenuation = LIGHT_ATTENUATION(i);                      //衰减后颜色值                      float3 AttenColor = Attenuation * _LightColor0.xyz;                         //【8.3】计算漫反射 || Diffuse                      float NdotL = dot(Normalection, LightDirection);                      float3 Diffuse = max(0.0, NdotL) * AttenColor + UNITY_LIGHTMODEL_AMBIENT.xyz;                         //【8.4】准备自发光参数 || Emissive                      //计算边缘强度                      half Rim = 1.0 - max(0, dot(i.normal, ViewDirection));                      //计算出边缘自发光强度                      float3 Emissive = _RimColor.rgb * pow(Rim,_RimPower) *_RimIntensity;                         //【8.5】计在最终颜色中加入自发光颜色 || Calculate the final color                      //最终颜色 = （漫反射系数 x 纹理颜色 x rgb颜色）+自发光颜色 || Final Color=(Diffuse x Texture x rgbColor)+Emissive                      float3 finalColor = Diffuse * (tex2D(_TextureDiffuse,TRANSFORM_TEX(i.texcoord.rg, _TextureDiffuse)).rgb*_MainColor.rgb) + Emissive;                                         //【8.6】返回最终颜色 || Return final color                      return fixed4(finalColor,1);                  }                 //-------------------结束CG着色器编程语言段 || End CG Programming Part------------------               ENDCG          }      }         //后备着色器为普通漫反射 || Fallback use Diffuse      FallBack "Diffuse" }