Help Issue with Rope Consistency!

[josemendez]

I have an issue with the ropes collision, sometimes when one rope collide with another one (or when another object) and stretched, it just slide through the other one, the solution I found is to increase the resolution and the pooled particles, but that make the rope so stretchy and its length increase!

This is what I want to achieve: when the rope collide with something (or with another rope), it should not pass through it, and at the same time, its length should not increase (maybe it can increase at the collision moment, but after it should return to its initial length).


Is there any way to do this?

Thanks,

Short answer: Just use more substeps. You can find this setting in the ObiFixedUpdater component.

Long answer: What you're experiencing is a mix of tunneling (the typical issue where small objects moving at high speeds pass trough each other, see this video if you're not already familiar with this: https://www.youtube.com/watch?v=ms0Z35GY6pk) and lack of convergence. Both can be addressed at the same time by advancing the simulation using smaller timesteps, which is best done by using more than 1 substep.

For a detailed description of how the underlying physics engine works and how substeps/iterations affect its quality, see:
http://obi.virtualmethodstudio.com/tutor...gence.html