? half4 LightingName (SurfaceOutput s, half3 lightDir,
half atten){}
This function is used for forward rendering when the view direction is
not needed.当中属性类型包含：
三种自己定义光照模型方法：
?
half4 LightingName (SurfaceOutput s, half3 lightDir, half atten){}
//This function is used for forward rendering when the view direction is not needed.
half4 LightingName (SurfaceOutput s, half3 lightDir, half3 viewDir, half atten){}
//This function is used in forward rendering when a view direction is needed.
half4 LightingName_PrePass (SurfaceOutput s, half4 light){}
//This function is used when you are using deferred rendering for your project.
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原文：http://www.cnblogs.com/mengfanrong/p/4888878.html