making the rope stiff ?

[Mickle]

Hi!

Increase the amount of substeps in your ObiFixedUpdater, and/or reduce the rope's blueprint resolution.

This, assuming you can't or don't want to just increase the mass of the rope too. Convergence in most physics engines decreases with large mass ratios (objects of very different mass interacting with each other). In some engines, this causes instability/jittering. In Obi -and all position-based engines- this causes spurious compliance.

The manual contains a very in-depth explanation of the engine works internally and how substeps and iterations affect convergence speed and overall quality:
http://obi.virtualmethodstudio.com/manua...gence.html

kind regards,

ty !