:? hi guys , im new in houdini, i need to instace (or replicate) object flying , on colling , is like more than 80 objects, and i want that this dont penetrate ech other and have to collide with some things and self collide too base in the
instance shape, PLS how i can work this ????

RBDPointObject is what you need my friend,

http://www.sidefx.com/docs/houdini12.5/nodes/dop/rbdpointobject [sidefx.com]

does basically that.. instances your geometry into the given points and treat them as a rbds. The examples at the end of the help page are pretty good to understand how to use it

Yes ,the best way is to use RBDPointObject.

But if you wanna make a very big project with too many instance or pieces (for example with 1000 pieces !) like Flocking Systems ,so you can use particles system !

Becasue you are new in the Houdini , I made a simple project about that for you and Of course I put good explanation of it's workflow in this poject.

I hope that you will enjoy it