I would like to draw a figure in 3D where I have a large cylinder inside which there are:
a) smaller cylinders parallel to the larger cylinder that contains them, like in the image below (taken from: How to draw cylinders inside a cylinder)
b) randomly distributed spheres that "break" the small cylinders. Occasionally these sphere may appear also on the surface of the main cylinder. I am also ok to place the sphere manually (rather than randomly)
I am looking for suggestion on how to proceed.