I suspect infrared time-of-flight. http://en.wikipedia.org/wiki/Time-of-flight_camera http://en.wikipedia.org/wiki/Time-of-flight_camera You can get pretty imp

I suspect infrared time-of-flight. http://en.wikipedia.org/wiki/Time-of-flight_camera http://en.wikipedia.org/wiki/Time-of-flight_camera You can get pretty impressive accuracy and precision at short distances, and the plane of depth points matches what their demo video shows: http://www.youtube.com/watch?v=_d6KuiuteIA&feature=player_embedded#t=53s http://www.youtube.com/watch?v=_d6KuiuteIA&feature=playe...