本程序主要通过不断改变视口位置来模仿动画效果，同时介绍了在进行opengl绘图时所做的一些不可或缺的准备工作-This procedure primarily by changing location, as I imitate animation effects, while the introduction during the opengl drawing done some essential preparatory work

OpenGL计算机图形学编程源码，实现动画效果，可配合OPENGL编程基础（第三版）一书使用-Computer Graphics OpenGL programming source, achieve animation effects, and with basic programming OPENGL (Third Edition) to use one book