17-06-2021, 08:24 AM
(This post was last modified: 17-06-2021, 08:48 AM by josemendez.)
(16-06-2021, 04:48 PM)josemendez Wrote: In case they are (rigidbodies), the only possible way for them to change their position is by rotating around the rope's medial axis (since ropes do not model torsion).
This is completely normal, and documented in the manual:
http://obi.virtualmethodstudio.com/manua...setup.html
Quote:Ropes: Since regular particles have no orientation (only a position), torsion effects cannot be simulated.
Rods: Rods are built by chaining oriented particles using stretch/shear and bend/twist constraints. They are much more sophisticated than ropes, can simulate torsion effects and retain their rest shape.
See: https://en.wikipedia.org/wiki/Torsion_(mechanics)
One of the main differences between ropes and rods is that ropes do not simulate torsion, rods do. Ropes are free to rotate around their medial axis (along their "length"), so are any objects attached to it. The cubes attached to your snake will rotate to either side of it as it rolls around the table. If you want to simulate torsion, use rods.