The brush itself is very easy to make. The thing you will not be able to see from the video is that I use a shrink tube to attach the Fiber Optic cable to the IR LED before I stuck it into the shell of a ballpoint pen. Excluding the color picker the openframeworks app is a mix of 2 app's fboTrailsExample and opencvExample. I would like to project on the glass in the future.

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