Hey everyone. I am new to instructables but you guys have really inspired me to see what I can come up with. By taking a few ideas I have come across on the net, around here, and a quick epiphany after watching a 3d movie, I have an idea. (sorry for post formatting, still trying to figure this out) I am trying to pull the parts together right now but if someone could build it first they could have the instructable. Well, to the idea then. Basically, using 2 ideas from Johnny Chung Lee(a grad from Carnegie Mellon University) that he has released to the public with software(found at johnnylee.net), any 2 digital projectors, and several polarized glasses received from movie theaters you can build your own 3d projection system with eye tracking to add perspective. The two projects of johnny Lee's we are using are Wii-mote eye tracking and Projector Stitching. Projector stitching will be used to automatically calibrate the projectors to perfectly overlap so the offset images are accurate(absolutely critical for 3d images) so we don't have to and the eye tracking would be used by software to add perspective to any live 3d environment/game(not necessary). The polarized glasses are used both by the projectors and the user so atleast 2 pairs would have to be acquired. Lenses are placed in front of the projector to filter out all but the correct pole of light. This will dim the projector slightly as light is being lossed but what you get is cheap polarized image. I have tested this and it does work if you project light through the back of the lens(the eye side). The only thing that presents a problem is the projection surface. Most surfaces scatter and remove polarization from light. The screens at movie theaters are specially made to not do this. I am still researching a cheap material that has this property so I can use it but if any of you find it first have at it. I just want the instructable up so we can see what we can do with it. What you get with this setup is two overlapping images that can be filtered effectively between the two eyes. This is what enables a 3d image to be sent. Add in the eye tracking and you have a 3d image that adjusts based on the position of the users head. This adds an amazing degree of interactivity to a 1 player game as now you have depth added to the experience and moving actually does something for the game.