As its name implies, a face object represents a 2-d surface.

顾名思义，Face对象表示一个2 - D平面。

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D shape retrieval of object surface is an important problem in computer vision.

物体表面三维形状恢复是计算机视觉的一个重要研究内容。

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The zone reflection characteristic of the smooth bent surface—a special 3 D object is discussed in theory in the paper.

针对一种特殊的三维目标——平滑弯曲表面，从理论上讨论了它的区域反射特性；

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