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Constellation gives particpants the ability to create, move and destroy stars, and be part of a network of constellations. It operates interactively in real time, from a live video feed.
Constellation is one application of the Bokchoi interactive video manipulation system. Visual effects can be easily constructed by writing programs in the Lua scripting language.
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I presented Bokchoi/Constellation at DorkbotSF. Here are my slides [pdf].
Mail Jeremy for more details.