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1. Reflection from a rough surface is often called diffuse reflection.
   粗糙表面的反射常常叫做漫射。
2. It is fairly common these days for modeling applications to render a rough surface for selected objects, while leaving unselected objects as wire frames.
   所有对象都需要用边框代表，建模应用程序通常只绘制所选对象的粗糙表面，而用线框代表未选对象。