If you’re using the PS3 Eye (our camera of choice), a gentleman who goes by the name Peau Productions has worked out a handy calculator for determining the relationship of the distance from the surface to the viewable surface area. I’m taking this with me to IKEA to see if I can find a solution for a housing that gets roughly the right proportions.
And his super, super-handy blog:
Of course, what’d be really nice is a lens that allows you to shorten this distance. One trick you’ll notice in the Trackmate project – in the “hardwood curio” project, they put the camera at the top of the box, and use a mirror to halve the distance. That’s the reason that project uses the big border.