Then, 1- cos is 0,sin is 0. The velocity is 0.

1-cos=0，sin=0，速度也是。

youdao

The cube is centered at Position (0, 0, 0), just like the ground plane.

跟地平面一样，这个立方体居中在(0,0,0)位置。

youdao

The cube is centered at Position (0, 0, 0), just like the ground plane.

跟地平面一样，这个立方体居中在(0,0,0)位置。

youdao