Video Feedback in PD/Gem

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I’ve had fun for a while playing with video feedback by pointing webcams back at the screen… more recently I’ve being applying this in a pure computer graphics context in PD with Gem. I’ve found that with a few elements of simple geometry like cubes and spheres, also using opacity and coloured lighting, a lot of rich chaotic stuff can happen, and it animates really smoothly too. Here are some screenshots from my experiments: