I don’t know if this is oF or not. But I thought it was very cool and wanted to share.
http://www.break.com/index/cool-laser-pattern-sound-test.html
It’s called “Sticky Light”:
http://www.k2.t.u-tokyo.ac.jp/perception/StickyLight/
Pretty awesome that it’s done without a camera.
I was fortunate enough to come across this at Ars Electronica last year and have a play, and it indeed is really awesome. One thing you can’t really see in that documentation is the fact that it can do 3D tracking of multiple fingertips (you can see a bit in the bottom left blurry pic) - so you can paint in 3D in the air with your fingers, very nice.
I posted this over at the NUIGroup forums also http://nuigroup.com/forums/viewthread/6589/ because it seems like it could be a great tech. for multi-touch UIs. I wonder how difficult something like this would be for a homebrew project…