Unity3D中shader 轮廓描边效果实现代码

Shader "Outlined/Silhouetted Diffuse" {  Properties {  _Color ("Main Color", Color) = (1,1,1,1)  _OutlineColor ("Outline Color", Color) = (0,0,0,1) //改变这个能改变轮廓边的颜色  _Outline ("Outline width", Range (0.0, 0.03)) = 0.008 //改变这个能改变轮廓边的粗细  _MainTex ("Base (RGB)", 2D) = "white" { }  }   CGINCLUDE #include "UnityCG.cginc"  struct appdata {  float4 vertex : POSITION;  float3 normal : NORMAL; };  struct v2f {  float4 pos : POSITION;  float4 color : COLOR; };  uniform float _Outline; uniform float4 _OutlineColor;  v2f vert(appdata v) {  // just make a copy of incoming vertex data but scaled according to normal direction  v2f o;  o.pos = mul(UNITY_MATRIX_MVP, v.vertex);   float3 norm  = mul ((float3x3)UNITY_MATRIX_IT_MV, v.normal);  float2 offset = TransformViewToProjection(norm.xy);   o.pos.xy += offset * o.pos.z * _Outline;  o.color = _OutlineColor;  return o; } ENDCG   SubShader {  Tags { "Queue" = "Transparent" }   // note that a vertex shader is specified here but its using the one above  Pass {  Name "OUTLINE"  Tags { "LightMode" = "Always" }  Cull Off  ZWrite Off  ZTest Always  ColorMask RGB // alpha not used   // you can choose what kind of blending mode you want for the outline  Blend SrcAlpha OneMinusSrcAlpha // Normal  //Blend One One // Additive  //Blend One OneMinusDstColor // Soft Additive  //Blend DstColor Zero // Multiplicative  //Blend DstColor SrcColor // 2x Multiplicative  CGPROGRAM #pragma vertex vert #pragma fragment frag  half4 frag(v2f i) :COLOR {  return i.color; } ENDCG  }   Pass {  Name "BASE"  ZWrite On  ZTest LEqual  Blend SrcAlpha OneMinusSrcAlpha  Material {  Diffuse [_Color]  Ambient [_Color]  }  Lighting On  SetTexture [_MainTex] {  ConstantColor [_Color]  Combine texture * constant  }  SetTexture [_MainTex] {  Combine previous * primary DOUBLE  }  }  }    SubShader {  Tags { "Queue" = "Transparent" }   Pass {  Name "OUTLINE"  Tags { "LightMode" = "Always" }  Cull Front  ZWrite Off  ZTest Always  ColorMask RGB   // you can choose what kind of blending mode you want for the outline  Blend SrcAlpha OneMinusSrcAlpha // Normal  //Blend One One // Additive  //Blend One OneMinusDstColor // Soft Additive  //Blend DstColor Zero // Multiplicative  //Blend DstColor SrcColor // 2x Multiplicative   CGPROGRAM  #pragma vertex vert  #pragma exclude_renderers gles xbox360 ps3  ENDCG  SetTexture [_MainTex] { combine primary }  }   Pass {  Name "BASE"  ZWrite On  ZTest LEqual  Blend SrcAlpha OneMinusSrcAlpha  Material {  Diffuse [_Color]  Ambient [_Color]  }  Lighting On  SetTexture [_MainTex] {  ConstantColor [_Color]  Combine texture * constant  }  SetTexture [_MainTex] {  Combine previous * primary DOUBLE  }  }  }    Fallback "Diffuse" }