Utilizing related algorithms of computational geometry to triangulate TIN partly to make node and line as vertex and side of triangles.
利用计算几何的相关算法，把矢量数据的节点和边界线作为TIN网三角形的端点和边，对TIN网的局部进行三角化。
In computational geometry, computing cross products is at the heart of line-segment methods.
叉积是计算几何中关于线段算法的核心。
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