基于边界表示的曲面实体造型系统的数据结构

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

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扑定义，为顺利进行曲面的拼合运算打下了基础．

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.