动画帧所有网格顶点包含着顶点的位置(可能包括法线)其全部储存在内存中。

Vertex positions (may include normals also) for all the vertices in the mesh for all the animation frames are stored in memory.

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利用该平面坐标网二叉树，把平面中的网格点一一映射到一个整数集合上，从而可以把平面中的任意点近似地映射为一个整数，而且可以任意精确，对任意平面图形图象的处理、储存和传输起着极其重要的作用。

The net points of a plane can be mapped onto a set of integers in a one to one way based on the tree, so can any point of a plane be approximately mapped onto an integer with arbitrary accuracy.

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