I played with this for a while and here’s what I’ve tried:
- linear damping to 0
- physical material with the following settings:
The low friction allows the coins to slip and slide a little as they fall. Not sure about restitution but the default felt a wee bit too bouncy.
Now, the coins still lose a lot of momentum here. This is due to the collider not having enough faces. It’s not as bad trying to roll a hex bolt but it adds up very quickly. A more complex collider is needed, 72 sides might be OK, but for something really good I’d roll, ehm, with 144 sides + bevelled edges:
This behaves differently than the standard 36 face. Better but at this point I think we’re hitting limitations of what PhysX can do.