This is a pretty clever commercial.

I was trying to figure out how they were determining your body-position from two controllers. From the videos I’ve seen, they do a pretty good job of it.

I can understand how they could figure out the controller’s position in 3d space, based on a 2d-camera image and the size of each of those balls from the camera’s perspective (which gives them a distance to the camera). I can also understand that they can use inverse kinematics to figure out a person’s arm position. But, as far as I can tell, if you hold the controller to your chest and take a step forward, the computer should perceive that your body is in it’s original location and you have your arms outstretched. Unless I’m missing something, they aren’t tracking the location of your body. Interesting stuff nevertheless. Also, I’m glad the system doesn’t suffer from the same cheats that you can do with the Wii motion controller.