摘要
回退操作是以边界表示法为主的实体造型系统３Ｄ－Ｍｏｄｅｌｅｒ中的一个重要操作；它可以及时消除实体构建中的错误，使实体得到恢复，从而提高造型效率。回退的原理是把各种高级操作分解成一系列可逆的元操作，并且把元操作的历史以一定的方式作以记录。回退功能还可用于保证各种高级操作的有效性以及实体的随时剖切显示。
This paper introduces the principle of undoing operation in 3D-Medeler solid modeling system which uses B-rep,as the main representation scheme of solids.In the system,all high-level operations are implemented by some primitive operations,and their inverse primitive operations are recorded into a model on which the UNDO operation is based,The detailed contents of the primitive operations and the procedures of implementing high-level operations are given.In the end,the applications of undoing in guaranteeing the validity of high-level operations and generating sectional views of solids are also described.
出处
《大连理工大学学报》
CAS
CSCD
北大核心
1995年第5期664-668,共5页
Journal of Dalian University of Technology
基金
国家教委博士点基金资助项目
