viewer 3D problem
I'm using SageMath 8.1 on Windows 10 Native with Jupyter Notebook.
The only 3D viewer that works is tachyon.
Both threejs and jmol leave an empty space without plot but no error is issued, all this for the same 3D plot tachyon was able to plot.
FWIW this is basically a duplicate of https://ask.sagemath.org/question/406...
It is related: at that time I didn't know it is a general issue, I thought the problem was related to vector fields only.