在特征造型中拓扑元素命名机制的研究

特征造型中最根本的问题之一是模型的拓扑元素（面、边和顶点）经特征编辑重构模型后的识别．为此本文提出基于CSG树的拓扑标识号命名机制和虚拓扑标记号命名机制，并运用书扑元素的继承性、割裂关系表的约束准则和相似性匹配技术实现其标识号在新旧模型中正确传递，大大提高特征编辑的可靠性。

THE RESEARCH OF A MECHANISM FOR NAMING TOPOLOGICAL ENTITIES IN FEATURE MODELLING

One of the fundamental problems in feature modlling systems is to idenop topological entities such as faces, edges and vedces of solid modls in such a way that the same entities can still be idenified after the model has been re-evaluated when editiong a feature. On the basis of CSG tree, the topological ID naming mechasm and the virtual topological ID naming mechanism,presented in this pape implement the topological entities mapping correctly betwee the old model and the new model by their inheritance, the constraint ruler of their splitting table and similar matching tecndques. So it enhances the stabilny of feature editiong greatly.