Is there an easy way to use particle instances as rigid body with Houdini 13?

I'm testing with a grid emitting particles over time. They interact with the ground without any problems but the shape used is point and not, in this case, cube.

I would like to keep them as particles so I could use POP VOP to control them but use cube as shape for interaction with the ground and each others.

Here is the test scene I'm working on.

You can do it with a packed primitive rbd object, they do react like a particle system to all kind of pop forces, but with bullet collisions

see attached file

Thanks a lot! That put me on the right track; never used the multisolver before.

And if I need a continuous emission rate, I can always use a Copy SOP with a Scatter SOP pluggued into it with $F as seed.