Help Obi Rope Lenght Problem

[josemendez]

I tried to increase it, but no effect at all. Btw, I increase the lenght of the rope to some object's position, then pin the last particle to some object. It works but when the object is pinned to the rope, the rope strectches like rubber. How can I prevent that? 

And my other question is; under what conditions should I change the mass of the rope(or should I change?)?

Hi,

It should have an effect. Are you using your own script to change the length of the rope? how does it look like?

Stretching is due to slow convergence, can be caused by insufficient constraint iterations and/or too large timestep (like in most physics engines). This is specially noticeable if the mass of the object attached to the rope is very large compared to the rope's mass.

So increase the amount of distance constraint iterations, and/or the amount of updater substeps. For more into on iterations/substeps and convergence, see:
http://obi.virtualmethodstudio.com/tutor...gence.html

You should change the mass if you feel like you need a heavier/lighter rope. It's up to you. Keep in mind that large mass ratios (very light/very heavy objects interacting together) slow down convergence, requiring to spend more resources to keep high quality results (iterations/substeps).