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Digitally assisted billiards

Gizmodo found this 12/10/2008 on hackaday.com

[Justin] sent in his Digitally Assisted Billiards project. Using a web cam, a computer and a projector, these guys have set up a system that shows you the trajectories of your current shot. It detects the angle of the cue and displays a glowing blue line showing where each ball would go and ...