ok, so another newbie question… I’m just throwing some rocks on a ground in bullet solver… and they… especially the small pieces, just keep rotating and sliding on the ground as if its ice…

I have set density to 100000, friction to 100, and bounciness to 0 on all the 4 (frankly seemingly redundant?) tabs:
1) in rbdconfig under physical attributes (user friction)
2) in bulletsolver properties under pieces > physical
3) in bulletsolver under collision > physical
4) in bulletsolver under collision > ground collision physical

Makes no sense from physics perspective, does it?

Seems like the same question

The behavior of small pieces is usually related to scene scale, since there is quite a few settings of a fixed scale on bullet solver that can influence the behavior like Collision padding/shrinking or contact breaking threshold, penetration threshold, etc

You can potentially just adjust Bullet World Scale which however may bring its own set of issues

Also the physical properties are on so many places since they refer to different objects which in DOP setup you would have on separate nodes, but in SOP wrapper they need to be accessible, namely
1. Per point overrides for any packed rbd whether it will be used in proxy or collision inputs
2. Default physical properties for pieces in proxy input
3. Default physical properties for pieces in collision input
4. Ground plane physical properties

Thank you.

Hi,

I have reviewed your query and i have tested it, It seems to be the Bullet World scale in the RBD Bullet Solver.

If Bullet World is larger than you might have to Push to a larger friction values.
If Bullet World is smaller like 0.05 It will work well with smaller friction values as well.

I have attached a image of my test work, it might help you for reference.