Don't know if this would work out for you, but you can have a simple
image that you check the color of pixels to tell where you are. I used
that method in this thing I did:
http://staff.funnygarbage.com/colin/track/track.mov
The stack is here:
http://staff.funnygarbage.com/colin/track.rev.zip
Once we did a golf game, where you had to hit the ball onto various
greens (using perspective 3D), and by checking the color of the pixel
you landed on it was possible to know whether you were on a green, and
on which one, even if the areas were broken up into multiple strange
shaped blobs.
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