这是一个从文件中读入顶点和三角形信息，做出三维图形，并且同时用鼠标和键盘实现了缩放，旋转，平移等基本操作，是用opengl进行三维作图，实现键盘鼠标交互的一个不错例子-This is a read from a file vertex and triangle information, making three-dimensional graphics, and also with the mouse and keyboard to achieve the zoom, rotation, tra