Balls moving in a sack?

[GreenDK]

Hi all.

I have been trying to make a "sack" with moving balls in it, but with limited luck.
How should I make that?

Using tyParticle skin looked bad. Just tore the round "sack"

Basically I am trying to to make an animation where you can see the sack contains moving balls.
Imagine a bag of marbles, with the marbles moving around.

Scene file attached

   


  Balls in a sack.max (Size: 720 KB / Downloads: 8)