Help obi fluid vibrate problem

[josemendez]

cause rolling friction looks better than the others. but it is not very important, it can change.

Rolling friction has no effect on fluids at all. It affects the particle's angular velocity on contact, but fluid particles have no angular velocity. Only granulars do. This is explained in the manual:
http://obi.virtualmethodstudio.com/manua...rials.html

Using rolling contacts only makes sense for actors that make use of particle orientations: ObiEmitter (when emitting granulars) and ObiRod. They are incompatible with ObiSoftbody, and will have no visible effect when used with ObiCloth and ObiRope.

You can leave rolling friction on, but it will just burn performance for no good reason. Also note that you don't have to use one of the sample collision material assets included, you can create your own and change any of its parameters. I mention this because you say "it looks better than the others", which makes me suspect you choose a material among the included ones only.

the thickness value of object has box collider was 0.1, I changed it to 0.03 and the jitter problem solved.

Yes, that makes sense. A thickness of 0.1 (which is quite large!) means particles will collide with the collider when they're at a distance of 0.1 units or less from its surface. This can "sandwhich" particles in between colliders, leading to jitter.

Glad you found the cause! let me know if I can be of any help. cheers,