(18-11-2018, 04:31 PM)ibbybn Wrote: Hey, I'm using obirope to tether a spear to a harpoon which you can reel back after shooting it.

If I'm using very low iteration/substep numbers the rope already looks like it's underwater but becomes way too stretchy.

If I use higher numbers the simulation is too fast to look realistic underwater.

Is there a way to get this slow motion underwater look without sacrificing stiffness of the rope?
Is this something I might be able to do with the new release or is it already doable?

(18-11-2018, 04:42 PM)josemendez Wrote: Increase the damping parameter on the ObiSolver. This has the effect of making the environment around the rope(s) a lot denser, making it lose kinetic energy faster (which is what happens underwater). The parameter is defined as the % of kinetic energy lost per second. So, the higher the parameter, the "thicker" the water around the rope, so to speak.

(18-11-2018, 04:55 PM)ibbybn Wrote: Very high values indeed get me there but I don't want any of the rope particles to completely stop moving. Especially if other parts of the rope are still moving this looks unrealistic. I guess I'll have to exclude all the particles under a certain velocity from the dampening?

(18-11-2018, 07:56 PM)josemendez Wrote: Nope, as the velocity itself is part of the calculation for kinematic energy, that would require using per-particle dampening values which isn't supported.

However you can use Oni.AddParticleExternalForces to add some random disturbance to each particle, if that's what you're after.

(18-11-2018, 08:55 PM)ibbybn Wrote: Thx for getting me on the right way!
Seems instead of faking the looks I should think more about the forces involved in real life when it comes to Obi. Got something realistic looking with aambient forces and lowering sleep threshold even more.