【UnityShader入门精要】Unityshader中的漫反射（逐顶点漫反射diffuse）

公式

Cdiffuse=(Clight *mdiffuse)max(0,n*l)
实现代码

// Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'Shader "Unity Shaders book/Chapter 6/Diffuse Vertex-Level" {    Properties {        _Diffuse("Diffuse",Color)=(1,1,1,1)    }    SubShader {        Pass{            Tags{"LightMode"="ForwardBase"}            CGPROGRAM        #pragma vertex vert        #pragma fragment frag        #include "Lighting.cginc"        fixed4 _Diffuse;        struct a2v{        float4 vertex:POSITION;        float4 normal:NORMAL;        };        struct v2f{        float4 pos:SV_POSITION;        fixed3 color:COLOR;        };        v2f vert(a2v v){        v2f o;        o.pos=mul(UNITY_MATRIX_MVP,v.vertex);        fixed3 ambient= UNITY_LIGHTMODEL_AMBIENT.xyz;        fixed3 worldNormal = normalize(mul(v.normal,(float3x3)unity_WorldToObject));        fixed3 worldLight = normalize(_WorldSpaceLightPos0.xyz);        fixed3 diffuse = _LightColor0.rgb * _Diffuse.rgb * saturate(dot(worldNormal,worldLight));        o.color = ambient+diffuse;        return o;        }        fixed4 frag(v2f i):SV_Target{            return fixed4(i.color,1.0);        }           ENDCG        }    }    FallBack "Diffuse"}

效果图