A vertex tree is built to represent the data structure of the models by octonary subdivision.
以八叉剖分来建立一棵顶点树，用以表示整个网格模型的数据结构。
The tree structure provides a view of the data that is more flexible than a simple database format.
与简单的数据库格式相比，树型结构提供了更加灵活的数据视图。
The Visitor pattern is often used to separate a data structure (the tree, in this case) from the algorithms that operate over the data structure.
访问者模式往往用于将数据结构(本例中是树)与通过数据结构操作的算法分离开来。
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