PeterPyPan

Thank you for the discussion and clarification on the issues with the MeshFix license. My first thought was indeed to make pyvista an extras_require option. But I understand that for...

> Also, PyVista is already a soft dependency here... it's listed in the `requirements.txt` for the development install when testing and building documentation. As a consumer of this package, you...

If that would be helpful, I can create a PR with the changes in the setup file and changes in the readme.