Inspiration / Reference
So I came by this interesting example of ping pong balls from Alvaro Navarro, where the amount of spheres are growing inside an invisible box.
So I think he is using some kind of particles to generate new PingPong balls at a point down the bottom of the invisible box, where the new generated particle balls will be pushing the already generated balls to the top using some kind of collision.
To make a simplified version for the first step, I did the following:
So I created a box. Deleted the top face and add Rigid Body Passive (so the box doesn't fall down). For simpelicity, I added one sphere with also the Rigid Body, but now type Active. Unfortunately it seems like it will set this type for all objectes with Rigid Body.
Something that is made in C4d, but don't know if this is possible in Blender, because there is no collision for each particle I've read? https://www.youtube.com/watch?v=HoxBLXKZ7gw