Re: How can I do this..?

Hi Leonardo,

You may want to try "Shatter":

-Set the Radius of Force1 to (0).
-Create a Custom Map in a new comp using CC Ball Action or even the Grid effect applied to a solid.
-Import this comp to the main one and us it as a map in your Shape menu.
-Animate the Extrusion Depth as you like.

Here is an old example:
http://www.nyc-visual.com/nails.mov

If it's what you are after and need more help, let me know and I will grab the aep for you.
Salut.
Serge