Physics in Javascript Using Box2D (opens in new tab)

I'm using box2d (there are at least three box2d javascript implementations; the most impressive is the emscripten port from the actual C++ code: https://github.com/kripken/box2d.js but I'm using an older one for this). I wanted to prototype a simple balancing robot controller, and I hacked this up on the bus to work earlier this week in fact: http://www.a1k0n.net/code/balance.html Click to drop junk.

(Sorry, this is totally off-topic, but...) It's surprisingly easy to make a segway-like balancing robot with perfect sensors. My plan is to add noise in the sensors and limited motor torque, etc. Ideally it would estimate its own kinematic parameters and do an A* search for approximate optimal control.

ah, it might be that we only tested on chrome. the project only allowed for 48 hours of development, so we can't really say that we made the best effort to keep it cross browser compatible. once the voting period is done and the code freeze is over, we're thinking of implementing a lot of bug fixes and changes that hopefully would address that.