本程序实习了openGL的茶壶(Teapot)；键盘C键控制其颜色；R键实现了旋转，同时X，Y，Z键可改变其旋转轴；方向键可控制光源位置；按着鼠标左键移动鼠标可以人工旋转，像Google Earth；按着鼠标右键移动向上移动鼠标壳缩小其尺寸，向下可放大-This program internship in openGL teapot (Teapot) keyboard C keys to control their color R key to achieving the rotation,

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