一个明亮的光点，例如金星，常常看上去像在移动。
A bright light, such as the planet Venus, often appears to move.
通过投射在房间中的网格状红外光点，追踪光点如何反弹并与两个摄像头获得的信息相关联来计算物体移动轨迹。
The movements are calculated by projecting a grid of infrared light spots into a room, tracking how light bounces back, and correlating this with information from the stereo cameras.
我做着这种旋涡式的手势，模仿着屏幕上这些光点的移动方式。
My hand made swirling motions, mimicking the action onthe monitors.
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