thanks again for your suggestion. I implemented the "locking the middle hinges" and right now, it gives funny results. But I guess it can be tuned. (I have not implemented the hack with passing the impulse to the opposite ball) yet.
Alternatively, I made an option that for every collision
* the hitting sphere is A
* the hit sphere is B
– passes on the velocity of A to B
– places A at its resting position
– sets A’s velocity to zero.
This looks a bit jumpy but it is rather realistic. Is there a way to naturally move the sphere to its resting position rather than just ‘teleporting’ it there?
Both options are in the updated patch, in case someone’s curious….