三维绘图系统构造模式

Structural Model of a Three-Dimensional Graphic System

该文论述了计算机辅助设计(CAD)中,三维图形的处理过程和它的基本原理。重点讨论了三维图形处理的各种交换过程,为此建立了各个坐标系统。针对透视投影和轴测投影讨论了如何建立窗口及对空间立体实现裁剪的方法,从而使得三维图形的生成有一正确的构造过程。

This paper deals with the processing of three-dimensional graphics in thecomputer aided design(CAD)and its basic principle.Because the discussionfocuses on the various transformations of three-dimensional graphics,differentcoordinate systems are established.Furthermore,from the View-point of per-spective and axonometric projection,this paper also discusses the methods ofhow to establish a window and how to realize clipping in a stereopicture soas to obtain the valid structural process in the formasion of three-dimensio-nal graphics.