opengl程序，实现三维物体的旋转,通常的做法是使场景绕 X,Y ,Z轴旋转,其不能达到图形可以随着鼠标的拖动绕任意方向旋转的预期效果,旋转有停滞、逆转和卡动现象。-Achieve the rotation of the three-dimensional objects, common practice is to make the scene around the X, Y, Z axis rotation, it can t achieve graphics can be as the mouse drag around an arbitrary direction of the desired effect, rotation is stagnant, reversal and the dynamic phenomena.