Balls chain with constraints, colision, mouse follow and the math needed

[alejandroquarto]

Hi!

I made my first tutorial about ball colisions, and a couple of things that (i think) may be good to learn.
If you want to approve it will be cool, if not maybe you can tell me how to improve it.
Thanks in advance

[alejandroquarto]

Thanks for the approval! i hope this tutorial can help to someone.