一种无需重新建模的特征编辑算法

介绍了一种对引用特征进行动态修改的编辑算法，这种算法基于Ｂ－Ｒｅｐ／ＣＳＧ混合表示的特征模型，可以保证存储在模型中的产品信息在特征修改操作完成后不会丢失，并且可以方便地实现修改过程中的约束驱动；提出了广义操作链表的概念和构造方法，实现了对造型操作的详细跟踪；利用索引表方法解决了广义操作链表对造型操作过程跟踪信息量过大的问题。本文所提出的算法已成功地应用在一个特征造型原型系统中

A Feature Edit Method Requiring No Remodelling

Many feature edit programs still require remodelling and make their use very laborious. The feature edit algorithm we developed is more efficient. Same as others, it starts from featurebased model represented by BRep/CSG hybrid method. Different from many others, it can prevent product information attached to geometric model from being lost during modifications and can permit the modified model to move among constrained features. A data structure, called generalized operation list, which contained operation node and caculation node, was designed and is used in this algorithm to implement detailed tracking of modelling and modification operations. An indexing list, which we developed, is utilized to compress the large amount of information produced in the course of tracking. All the methods presented in this paper were applied with success to a featurebased modelling prototype system.