Box2D https://github.com/erincatto/box2d https://github.com/erincatto/box2d I went over every file of this writing a Unity plugin for it in work once. I was rea

Box2D https://github.com/erincatto/box2d https://github.com/erincatto/box2d I went over every file of this writing a Unity plugin for it in work once. I was really impressed, learned a lot.