If you want to dig into VTK, try out ParaView (https://www.paraview.org/) or VisIt (https://wci.llnl.gov/simulation/computer-codes/visit), both open source and scriptable with Python.

VTK is a mature industry standard for 3D data serialization and visualization. That's much more heavy then mplot3d (matplotlib 3d) or gnuplot 3d.