I have not explored the PSTricks'
pst-solides3d, TikZ's equivalent packages, Asymptote as a tool, etc, yet.
I have a task to make some simple 3D diagrams that are related to 3D geometry subject we learnt in senior high school. For example, we need to find the cross section of a cube cut by any plane, or a point at which a line penetrate a plane, etc.
Which packages or tools do you recommend?