Shader toon 卡通效果

主要是两点

1.采用Ramp map改变光照为阶梯强弱效果（各种效果自己尝试）

2.描边

这种shader unity有自带。

自己实现则需要描边算法和改变光照模型

 Properties {    _Color ("Diffuse Material Color", Color) = (1,1,1,1)    _UnlitColor ("Unlit Color", Color) = (0.5,0.5,0.5,1)    _DiffuseThreshold ("Lighting Threshold", Range(-1.1,1)) = 0.1    _SpecColor ("Specular Material Color", Color) = (1,1,1,1)    _Shininess ("Shininess", Range(0.5,1)) = 1     _OutlineThickness ("Outline Thickness", Range(0,1)) = 0.1    _MainTex ("Main Texture", 2D) = "AK47" {}           }        SubShader {     Pass {    Tags{ "LightMode" = "ForwardBase" }        // pass for ambient light and first light source             CGPROGRAM               #pragma vertex vert        //tells the cg to use a vertex-shader called vert        #pragma fragment frag        //tells the cg to use a fragment-shader called frag               //== User defined ==//               //TOON SHADING UNIFORMS        uniform float4 _Color;        uniform float4 _UnlitColor;        uniform float _DiffuseThreshold;        uniform float4 _SpecColor;        uniform float _Shininess;        uniform float _OutlineThickness;                    //== UNITY defined ==//        uniform float4 _LightColor0;        uniform sampler2D _MainTex;        uniform float4 _MainTex_ST;                       struct vertexInput {                   //TOON SHADING VAR        float4 vertex : POSITION;        float3 normal : NORMAL;        float4 texcoord : TEXCOORD0;                     };               struct vertexOutput {                       float4 pos : SV_POSITION;            float3 normalDir : TEXCOORD1;            float4 lightDir : TEXCOORD2;            float3 viewDir : TEXCOORD3;            float2 uv : TEXCOORD0;        };               vertexOutput vert(vertexInput input)        {            vertexOutput output;                       //normalDirection            output.normalDir = normalize ( mul( float4( input.normal, 0.0 ), _World2Object).xyz );                       //World position            float4 posWorld = mul(_Object2World, input.vertex);                       //view direction            output.viewDir = normalize( _WorldSpaceCameraPos.xyz - posWorld.xyz ); //vector from object to the camera                       //light direction            float3 fragmentToLightSource = ( _WorldSpaceCameraPos.xyz - posWorld.xyz);            output.lightDir = float4(                normalize( lerp(_WorldSpaceLightPos0.xyz , fragmentToLightSource, _WorldSpaceLightPos0.w) ),                lerp(1.0 , 1.0/length(fragmentToLightSource), _WorldSpaceLightPos0.w)            );                       //fragmentInput output;            output.pos = mul( UNITY_MATRIX_MVP, input.vertex );                         //UV-Map            output.uv =input.texcoord;                       return output;                 }               float4 frag(vertexOutput input) : COLOR        {     float nDotL = saturate(dot(input.normalDir, input.lightDir.xyz));               //Diffuse threshold calculation    float diffuseCutoff = saturate( ( max(_DiffuseThreshold, nDotL) - _DiffuseThreshold ) *1000 );               //Specular threshold calculation    float specularCutoff = saturate( max(_Shininess, dot(reflect(-input.lightDir.xyz, input.normalDir), input.viewDir))-_Shininess ) * 1000;               //Calculate Outlines    float outlineStrength = saturate( (dot(input.normalDir, input.viewDir ) - _OutlineThickness) * 1000 );                      float3 ambientLight = (1-diffuseCutoff) * _UnlitColor.xyz; //adds general ambient illumination    float3 diffuseReflection = (1-specularCutoff) * _Color.xyz * diffuseCutoff;    float3 specularReflection = _SpecColor.xyz * specularCutoff;           float3 combinedLight = (ambientLight + diffuseReflection) * outlineStrength + specularReflection;               return float4(combinedLight, 1.0); // + tex2D(_MainTex, input.uv); // DELETE LINE COMMENTS & ';' TO ENABLE TEXTURE                }               ENDCG           }       }    Fallback "Diffuse"

不带描边的surf shader

Properties{_MainTex("Texture", 2D) = "white" {}_RampTex("Ramp", 2D) = "white" {}}SubShader{Tags{ "RenderType" = "Opaque" }CGPROGRAM#pragma surface surf Toonstruct Input {float2 uv_MainTex;};sampler2D _MainTex;void surf(Input IN, inout SurfaceOutput o) {o.Albedo = tex2D(_MainTex, IN.uv_MainTex).rgb;}sampler2D _RampTex;fixed4 LightingToon(SurfaceOutput s, fixed3 lightDir, fixed atten){half NdotL = dot(s.Normal, lightDir);NdotL = tex2D(_RampTex, fixed2(NdotL, 0.5));fixed4 c;c.rgb = s.Albedo * _LightColor0.rgb * NdotL * atten * 2;c.a = s.Alpha;return c;}ENDCG}Fallback "Diffuse"