It's radians now.

EDIT: lol

How about saving and loading its own format?

I am wondering if anything has changed since I posted this.

Anyone look into it at all?

http://luajit.org/luajit.html

setSpin(10) sets spin to 10 radians
getSpin() returns 573 degrees
setSpin(getSpin()+10) sets spin to 583 radians

I'd vote for dealing only with radians here, and maybe
rename the functions get/setAngularVelocity so the API
maintains the convention of primarily mirroring box2d.

Same thing goes for getDensity.

It might be ok to fail in horrible ways after an explicit destroy().

Can you simply assign the symbol a nil value after the explicit destroy()?

Something like that, or possibly your example (not sure), would be ok too.

A nil joint remains active in box2d until the garbage collector runs.

Is there a way to destroy joints explicitly without calling collectgarbage?

Wow, thanks for the feedback guys. I wasn't even really planning on releasing it.

qubodup: If we make this into a game with levels the story will involve zealous treehugging.
Polaris: I cleaned up the code for r3 and just uploaded. It should be easier to understand now.

My 9 year old designed this on paper and created the vehicle graphics.
I did the rest. Game ends at 200 kills and gives you a skill rating.

Download here or attached.

This function signature is documented but not available, while setSpread is available and working but not documented.