基于边界表示的曲面实体造型系统的数据结构

实体造型是ＣＡＤ系统的核心模块，而二次曲面在工程中常用来描述轴，孔及圆角等形状特征。讨论了在微机上实现的一个基于边界表示的实体模型的数据结构，并针对二次曲面的特点，实现了对自封闭曲面的无二义性拓扩定义，为顺利进行曲面的拼合运算打下了基础。

The Data Structure of a Curved-surface Solid Modeller Based on Boundary Representation

Solid modeller is the core of the CAD system,and quadric surfaces are often used to describe form features of shaft,hole and round etc..The data structure of a solid modeler based on boundary representation which has been inplemented on micro-computer is discussed,and the topology of self-enclosed curved-surfaces is unambiguously defined considering the characteristic of quadric surfaces,and so the boolean computing of curved-surfaces is successfully implemented.