实现一个opengl程序，要求画一个茶壶，放置在位置（100，50，200）处，对其设置一个合适的透视三维观察空间，并设置一个裁减面裁去其一部分。

-To achieve a opengl procedure that requires painting a teapot, placed in the position (100,50,200), Office set up a proper perspective of its three-dimensional observation space, and set a cut to his face as part of the Conference.