3D Rendering for GNS

Hello,

I am interested in learning 3D simulations, and then to render them. I have managed so far on larger hardware to perform 3D learning and simulation, but I am unable to find good (and more specifically "easy") resources to render 3D point clouds as done in the paper.

How did you render both "ball-like" renders, but more specifically renderings with a pseudo-surface from these point clouds?

Thanks in advance,
Sacha Lewin