该模型的拓扑结构可以是任意型式，允许包含四边形单元、三角形单元和梁（杆）单元。
The model may be various non-simple topological structures and contain any combinations of beams, triangular elements and quadrilateral elements.
提出了三棱柱的体元构造，详细设计了点、三角形、侧面和三棱柱体的数据结构，建立了一定的拓扑关系。
Also this article puts forward the data structure of point, triangle, side face and tri-prism and builds some topology.
该算法充分利用TIN中各三角形间存在的拓扑关系，实现了与剖面线相交三角形的快速搜索，大大提高了算法的执行效率。
It makes full use of the topology relation among triangles in TIN to search triangles intersected with the section line, which increases the efficiency of the algorithm.
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