在本源码中, 实现一个简单的3D格网显示。所编写的程序除了显示物体的模型外，还要能让用户改变光的位置和物体的颜色，大小变化以及旋转功能-In the source code, the realization of a simple 3 d grid display. Written procedures in addition to show the object model, also can let the user to change the position of the light