常用光线下立体落影的画法研究

Research on Making Shadow of Solids under Common Used Light

指出了传统的求立体,尤其是曲面立体的落影方法的困难,提出了一种新的求立体落影的方法。充分利用AutoCAD的二维图形编辑功能以及与AutoLISP语言的接口功能,并在数学分析的基础上与程序设计有机地结合起来,将简单平面立体落影的拉伸画法引伸到圆的落影画法,从而实现了对复杂回转曲面体落影的作图。该方法简单,易于掌握。

The difficulties of making shadows of solids, especially for revolved objects by using traditional method, are pointed out and a new method is put forward. The new method uses powerful edit function of AutoCAD and AutoLISP functions, combines with programming on the basis of mathematical analyze, and applies the stretching method of making simple planar object shadow to the complex revolved object. This method is simple and easy to master.