Softbody Collision Issue

[josemendez]

Hi,

I'm having an issue with collisions on my softbody.  See my video:
https://www.youtube.com/watch?v=xQY2KtbF...e=youtu.be

Basically, I'm seeing collisions go inside each other and sometimes when they touch they slide too.

Any ideas on how to make them not do that?

Thanks!
Jeff.

Your particle sampling seems quite sparse, there's lots of empty space between particles. This can cause soft bodies to become "interlocked" with each other, like jigsaw pieces. In this situation, particles become entangled with each other and simultaneously try to get out of collisions, while shape matching constraints put them in a colliding-state again.

This can cause the "sliding", as particles are trying to simultaneously reach two mutually exclusive states at once: be collision-free, and strive to keep the undeformed softbody shape. This will cause them to try to "escape" the situation by moving to whatever direction the last constraint tries to project them.

Simply make your particle size larger, or use more particles. It's usually also good to let them overlap a bit.

Also, are you planning on making the solver at some point use the jobs system?

Yes we are, but not for performance reasons but for portability. Under the hood we use our own job system, coupled with extensive SIMD use. Performance wise we are on par with Jobs+Burst, often even faster. You can read a bit more here:
http://obi.virtualmethodstudio.com/forum...p?tid=1619
https://forum.unity.com/threads/schedule...st-5368893