Testing a method for creating tank tracks in Box2D. A fake relative velocity is added between the contacts to give a conveyor belt type effect, as suggested by mayobutter.
Update: a tutorial for how to get this effect is now up:
http://www.iforce2d.net/b2dtut/conveyor-belts
...
https://www.youtube.com/watch?v=yGU1E6wQFqE
A series of tutorials on using the R.U.B.E Box2D editor.
Full playlist: https://www.youtube.com/playlist?list=PLzidsatoEzejt4smjfpeOd-XDjtE6PFr9
...
https://www.youtube.com/watch?v=670GEtkOUwY
https://www.iforce2d.net/mixercalc/
Amazingly nothing went wrong, not even a broken prop. I was surprised at how well the all-coaxial layout performed. Was expecting the regular circle to perform better.
...
https://www.youtube.com/watch?v=c6aCwSHr_is
(Try 720p) Just a little test to check the speed of Box2D raycasting in a complex scene. The second part of the video shows 10,000 rays, which is so many that drawing a single pixel width line for all of them appears as a solid block of color. The maximum time for a raycast during the test can be seen in the top left: 0.004ms (average time is 0.0029ms).
Measurements taken on Core 2 Duo 3GHz.
Source code available here: http://www.iforce2d.net/b2djson/
...
https://www.youtube.com/watch?v=C-ScURIRTGA