sQuidball : siggraph electronic theater preshow

Squidball is a large-scale, real-time interactive video gaming experiment that uses motion capture technology to create a unique, energetic and exciting gaming experience, with aims of collective collaboration. The audience plays to eliminate the virtual targets, visualized in 3D on a 40-foot screen, also displaying scoring, timers and level advancement and results. Advancement is achieved when all virtual targets are eliminated, and thusly the audience is motivated to collaborate for each level and arrive at successful game completion.
The game debuted on August 12th, 2004, with an audience of 4,000 people, at the Los Angeles Convention Center, as pre-show entertainment for the SIGGRAPH Electronic Theater. It was also the world's largest calibrated motion capture volume to date, approximately 3,200,000 cubic feet (90,000 cubic meters)
The technologies involved were developed at the NYU Media Research Lab with a fantastic team of collaborators, using Max/Jitter as the realTime graphics and audio generator, with data provided by the Vicon motion capture system and most importantly... helium-filled weather balloons in retroreflective jackets as the driving components / input devices for the game.