2D Physics Engine

[justsomeguy]

Hello all,

I did a little gear train demo with the physics engine. Its a little slow and a bit janky, but it helped identify several bugs in the engine, which helps make it better.

It highlights a workaround for one of the weakness of the engine, and that is no concave objects, but nothing prevents attaching multiple objects together, also highlighted in the cutting board demo. The gears are made of a circle object and a bunch of triangles (gear teeth) attached to it. That's why if you look closely you can see the teeth twist a bit.

Before anyone asks, no you probably wont be able to simulate a whole clock. The escapement would be very tricky and it would be extremely slow.

Of course I've posted this to my github as well.