运行vrplanets.mdl文件可以看到太阳系运动模型，在窗口中可以调节运动的速度，不同的视角去观察三球体之间的运动，可以改变球体的大小。-The run vrplanets.mdl file you can see the motion model of the solar system can adjust the speed of movement in the window, a different perspective to observe the movement between the three spheres, you can change the size of the sphere.