Light Tracking is small program that is writen in Processing (a Java framework) which uses a video camera and a projector.
The video camera and the projector are calibrate, so it gives a sense that you are drawing on the wall (they are not calibrated in this video, due to cable problems :P ).
The script job is to look at the video signal, and find the brightes spot in that signal ( like pixels from 240 to 255) and then send through the projector.
The colors are random picks by the script.

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