At first, the method uniformly divides the bounding box of the out-of-core model into sub-boxes for the local model in every sub-box to be able to process in core, and manages the sub-boxes hierarchically in an octree.

• 该方法首先将外存模型的包围盒空间按照八叉树形式进行剖分和层次化组织 ,使得最精细层次的各个立方块空间中的局部模型都能完全装入内存进行处理 ;