How to swing the rope correct?

[josemendez]

I mean I have rope and I have chain from metal what is heavy, but the rope not moving correctly. Correct means that the all particle stay in 1 line only. So not flexible at all.

Hi!

That's not correct at all, in the sense that no rope/chain in the real world moves keeping a straight line. That's only the case for rigidbodies (eg. steel bars).

1, how can move all the particle?

You can iterate trough all particles in the rope and move them all if you wish, by using the particles API:
http://obi.virtualmethodstudio.com/manua...icles.html

However I don't recommend doing that at all if you're looking for something that resembles a pendulum, only one particle (the one at the top of the pendulum) should be explicitly moved around.

2, how can remove the flexibility of the rope, so I want a hard rope

Just use more substeps/iterations. The manual contains an in-depth explanation of how the simulation works internally and how iterations/substeps affect convergence speed and simulation quality: http://obi.virtualmethodstudio.com/manua...gence.html

I'd start by using 10-12 substeps (you can find this setting in the ObiFixedUpdater component) and a couple distance constraint iterations (all constraint iterations are found in the ObiSolver component).

kind regards