During the rendering process, two threads are used.One of them is responsible for generating multi-resolution terrain mesh by using quad-tree, flag matrix, and view frustum.
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- 该阶段使用两个线程，其中绘制线程主要借助四叉树结构，标识矩阵，裁减视景体来实现四块子地形的多分辨率网格生成；
