Problem

I couldn't make fill between to work for my 3D plot of a unit circle with a spectrogram sitting on top.

I went through the example on the website (https://matplotlib.org/stable/gallery/mplot3d/polys3d.html) but couldn't adapt it to my plot.

Proposed solution

Finally I found a repo that implements a fill_between_3d function and I could easily make it work.

Please consider adding it to matplotlib.