Help 7.1 Obi bone spasm

[Jawsarn]

After updating to 7.1 every time I do a domain reload one part of a rope hierarchy chain spasms (one of two symmetrical ears) out by aerodynamic forces.
Interestingly, once I reduce drag for that Obi Bone component from 10 to 0, another Obi Bone component on the same Solver starts spasming out. If I restart, it doesn't seem to spasm out.

[josemendez]

After updating to 7.1 every time I do a domain reload one part of a rope hierarchy chain spasms (one of two symmetrical ears) out by aerodynamic forces.
Interestingly, once I reduce drag for that Obi Bone component from 10 to 0, another Obi Bone component on the same Solver starts spasming out. If I restart, it doesn't seem to spasm out.

Hi,

I'm unable to reproduce this. Would it be possible for you to send a repro project to support(at)virtualmethodstudio.com so that I can take a closer look? thanks!

[Jawsarn]

Hi,

I'm unable to reproduce this. Would it be possible for you to send a repro project to support(at)virtualmethodstudio.com so that I can take a closer look? thanks!

I think this was because my character was spawning inside an object which caused it to do an initial transform that cause big spike in velocity. Now it doesn't initially get stuck and spasm, but I can get it to get stuck similarly by doing large impulses from movement with these settings. Is the drag coefficient here just too big for the system? The goal is to have very drag affected big ears, I can get the spasm to dissapear to limit max velocities. But would be nice with some clearity if there's something I'm doing wrong.
       

[chenji]

I think this was because my character was spawning inside an object which caused it to do an initial transform that cause big spike in velocity. Now it doesn't initially get stuck and spasm, but I can get it to get stuck similarly by doing large impulses from movement with these settings. Is the drag coefficient here just too big for the system? The goal is to have very drag affected big ears, I can get the spasm to dissapear to limit max velocities. But would be nice with some clearity if there's something I'm doing wrong.

Could you post a video to show what does the "spasm" look like? From the configuration you post I would suggest you try to disable bone stretch as it may be related to what I understand the "spasm" mean. And the collision may be related to the "stuck" you mentioned. Try to set Obi collider to collide with nothing to see what happens.
I would test Obi Bone related settings in this way though: connect your "ear" to a cube with a unity configurable joint (xyz rotation free, xyz move locked). Then you can quickly move the cube in the editor in play, to see whether it behaves as you expect. If it goes well in this way, it can be confirmed your initial problem is related to something else such as collider settings.