I've used this a lot in the past few weeks. It's really amazing. It has some trouble with triangles. But having a physics engine completely written in Javascrip

I've used this a lot in the past few weeks. It's really amazing. It has some trouble with triangles. But having a physics engine completely written in Javascript from the ground up using good JS principles is refreshing. One of the coolest features is mobile demo. Buttery smooth on my iPhone.