haha... then you'd better give them their own mock-up to play with early... (thats what our team did this year... and we didn't have to spend the bus ride to pittsburgh programming, made for better coding, less stress, life is good. Programmers are people too!

)
you'll kill 2 birds with one stone... they'll be able to tweak it better, and they'll also be able to play with the camera, and get the robot moving in the right direction.
Optical encoders --> mecanum wheels scuff. Thats what they're designed to do, so be careful how you approach that.
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