Why some many Bounce and Friction settings?

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Ok, so newbie question.
I have a bunch of stuff falling down (rocks copied via copy to points). Using RBDBullet solver. Before the bullet solver I have RBDConfig. Bullet has ground plane enabled for collision.

Problem - rocks just keep spinning the sliding down the ground.


I’ve tried playing around with friction, but it doesn’t really slow them down. In fact in some cases makes them bounce even higher.

So question… why are there so many friction/bounce settings?
1) Physical attributes under RBD Config
2) Under Properties>Pieces in Bullet solver
3) Under Collision > Collision Geometry in Bullet solver
4) Under Collision > Ground Collision > Physical in Bullet solver?

Any help appreciated.
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https://www.sidefx.com/forum/topic/86890/#post-375276 [www.sidefx.com]
Tomas Slancik
CG Supervisor
Framestore, NY
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