Possible to do mushroom-shaped-ish scattering of mini-spheres?

[uqlcai1]

I am trying to scatter small spheres in a similar fashion to this diagram: 

Where the teal/blue regions will be made of individual spheres, instead of being a continuous structure.

I have, comically unsuccessfully, tried to "approximate" this through successive layers of scattering on geosphere vertices, then exploding and deleting swathes of spheres, yielding this:

 

And through some bad photoshop to composite it with the inner layers, separately modelled and rendered:

 

Well... this is not very close to the envisioned outcome at all.

Would anyone know of any smarter/proper ways to try and achieve this kind of object scattering?

If it helps at all, I've attached my extremely novice attempt that generated the above renders.

[strdr]

Have you tried to use this script?

https://www.scriptspot.com/3ds-max/scripts/voxelizer

[MartinBeh]

You could also create a dense 3D grid of spheres and then use Vol. Select > Mesh to use a helper geometry to select only a subset of those spheres in a grid and then delete those (or the remaining ones).

Other ideas:

- use PFlow to place spheres inside a volume

- use Array modifier to place copies of one mesh on the vertices of another; that other mesh would need to be a box, for example, with lots of Slice modifiers to create a dense 3D vertex grid structure. Then user Array on surface with the option "Cull Object".

[MartinBeh]

It just occurred to me: Use Array modifier in Grid mode to generate a 20 x 20 x 20 array, for example, then use its "Remove" rollout to set a "Cull Object". This will only keep array clones that are inside of the picked mesh (use the "Invert" option to delete the copies inside the mesh).

This, in addition with a Vol. Select should go a long way...?