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.
提出了一种基于曲面局平特性的，以散乱点集及其密度指标作为输入，以三角形分片线性曲面作为输出的拓扑重建算法。
An algorithm for topology reconstruction is promoted that takes as input an unorganized set of points with known density and carries out as output simplicial surfaces.
接下来求出两相交三角形之间的交线，建立与三角形的交线拓扑关系；
Through the intersection test of the triangles, the intersecting lines could be obtained and the intersecting lines topology relations with the triangles could be established.
接下来求出两相交三角形之间的交线，建立与三角形的交线拓扑关系；
Through the intersection test of the triangles, the intersecting lines could be obtained and the intersecting lines topology relations with the triangles could be established.
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