这些特殊计算与那些是相似被使用在重覆叠盖的几何图形：交叉点被计算，点和连接被形成，拓扑结构建立，并且更新属性表格。

These particular computations are similar to those used in polygon overlay: intersections are computed, nodes and links are formed, topology is established, and attribute tables are updated.

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探讨了拓扑优化设计过程中，基本结构建立、优化过程控制及优化结果分析与应用等问题。

Problems of the establishment of basic structure, control of optimization process and analysis and application of optimized result etc. were discussed during the course of topological optimal design.

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