This rig lets people paint light on the side of buildings. Its creators wrote some software that requires a video capture rig and a projector, detecting a 60mW green laser and instantly “painting” the shined-upon surface with light from the projector. It’s brilliant.
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I wonder why it bleeds?
I think that’s a feature — one of the options available to enhance whatever’s drawn. In that case, I think it’s supposed to run like some spray paint does.