the work Johnny did was right off the PC as even he noted. He just hooked up the wii-mote to his pc and use it as a camera just like pretty much any PC camera with a IR lens. He could have easily used a third light and copied right off from Track IR.
The reason why it's better to have a camcorder/camera on a stand is because any tiny movement of your hand equals a lot of movement in the distance. ( try to record something while you are running) A good camera like TrackIR can see any little movement with the IR points yet have a greater range and precision than moving the camera itself. Again this is why Johnny had the IR lights attached to his glasses and not the camera (wii-mote).
Correct me if I'm wrong but from what I've read Ps wand doesn't use IR lights but tracks four different color lights. (all the IR lights I've seen are directional as with lazers) Since the PS eye will be program to track a certain color sphere it would be more accurate to track than someone's face which comes in many different shapes,colors and sizes. Plus if you use a IR camera lens, it filters out all light but IR light. (It also tries filters out other IR sources like a stove or sunlight) So if PS wand use IR to track then it would seem to me the PS eye would have to have this filter which in turn couldn't track your face.
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