1.初始化 struct：
UNITY_INITIALIZE_OUTPUT（type,name）
Type: struct 名字
Name :变量的名字
struct Input{float2 uv_MainTex;float3 myColor;};half _Glossiness;half _Metallic;fixed4 _Color;void MyVertx(inout appdata_base v,out Input o){//宏定义 初始化structUNITY_INITIALIZE_OUTPUT(Input,o);o.myColor = _Color.rgb;}2.顶点着色器 和片段着色器 的运算次数不是一个量级的，能放在顶点着色器里面运算的，尽量放在顶点里面运算
3.abs(v.naormal) ： 法线取值是 -1到 1 ，所以abs是取绝对值 (0-1)
Shader "Custom/TestParameter"
{Properties{_Color ("Color", Color) = (1,1,1,1)_MainTex ("Albedo (RGB)", 2D) = "white" {}}SubShader{Tags { "RenderType"="Opaque" }LOD 200CGPROGRAM// Physically based Standard lighting model, and enable shadows on all light types#pragma surface surf Lambert vertex:MyVertx// Use shader model 3.0 target, to get nicer looking lighting#pragma target 3.0sampler2D _MainTex;struct Input{float2 uv_MainTex;float3 myColor;};half _Glossiness;half _Metallic;fixed4 _Color;void MyVertx(inout appdata_base v,out Input o){//宏定义 初始化structUNITY_INITIALIZE_OUTPUT(Input,o);o.myColor = _Color.rgb * abs(v.normal);}void surf (Input IN, inout SurfaceOutput o){// Albedo comes from a texture tinted by colorfixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;o.Albedo = c.rgb * IN.myColor;o.Alpha = c.a;}ENDCG}FallBack "Diffuse"
}
