unusual rigid body physics issue

Unity Engine
1

Hi,

I have a box collider floor of 3 units thickness and 8 balls of 3 units thickness.

When I stack the balls (just drop them on top of each other), they will eventually force the lowest ball in contact with the floor, through the floor.

Just using box and sphere colliders. I use Addforce each frame on the balls if that makes any difference, instead of gravity because later, each ball must fall downwards at different rates. For now the addforce is about -50.

This happens when they have a low amount of bounciness. Any solutions?

2

Whenever I’ve had trouble with collisions, I try to set the simulation on the rigid bodies to Continuous Dynamic. If it works there, then atleast we have a starting point.

3

Continous and ContinousDynamic didn’t fix the issue. They are already colliding: they just “sink” together over time.

4

Have you tried tweaking skin depth any? I actually can’t seem to replicate the issue, but I just tested it with gravity.

5

Yep tried everything, I am not using gravity though. Every object has to fall at different rates using addforce.