Glasses-Free 3D Display Using Front-Facing Camera and Head Tracking

"The clever folks over at the Engineering Human-Computer Interaction Research group have managed to combine a feed from the front-facing camera, with a bit of software wizardry, to track the position of a person's head in 3D in real-time."

http://www.tuaw.com/2011/04/11/ipad-2-gets-glasses-free-3d-display-using...