bullet physics strange movement

Hi everybody,
I try to make a animation with some coins falling from the sky. So I modelled a low resolution coin and set it up for physics.
But when the coins hit the ground, they begin with a strange movement and kind of float up and down.
Any idea what could be the problem?

I attached the blend file, so you can take a look at it.

Thank you very mutch!

Günter
rain of coins.blend (4.77 MB)

That’s simple: You just need to apply the scale to everything. In Object mode: [CTRL A] --> Scale.

Of course, it won’t work because your coins are linked copies. So…

Select all the coins. [U] --> Object & Data

[CTRL A] --> Scale

[SHIFT RMB] on one of the coins without physics to make it “active”. It should now be highlighted in brighter orange.

[CTRL L] --> Object Data.

Don’t forget to apply the scale to the floor too.

Now, it will work.

After playing around with it a bit, it also seems to help a little if they aren’t all capped with n-gons. Before you make them all single-user (Kaluura’s first step), fix that.

Or after. I totally skipped the explanations but, after all I do, the coins are linked copies again. Editing one modifies all of them.

Oh yeah, I didn’t pay attention to your last step.