实现3D图像的平移和绕定轴旋转，增加了光照模型，键盘的控制，和观察者视点的按键移动。PS：我觉得对初学者能够更好地理解函数有很大帮助。-3D images to achieve the translation and rotation around a fixed axis, increasing the illumination model, keyboard control, and observers point of view of the key moves. PS: I think beginners are better able to understand the function of great help.