Can't test at the moment, but I'll finally be getting a Mac shortly for another project...

I looked at the link and apparently the order is important, Initialize needs to be called after show().

In blockbuilder, I created a showEvent() function that calls Initialize after the event is accepted (not tested on mac).

Another solution would be to create a show_signal connected to the Initialize() of the interactor.

If we can get away with not calling Initialize at all and let VTK figure out the right time to do it (?), then that seems safest. I'll check to see if this fixes things for me on my macOS laptop...

Quoting David Gobbi: "QVTKRenderWindowInteractor.py does not call Start() or Initialize() itself, there’s nothing that can be done there."

Reference: https://discourse.vtk.org/t/vtk-9-pyqt-macos-no-rendering/3358/22

If it's working for everyone without Initialize(), it's fine by me.

I get a segfault on this branch with the MNE example I usually test with. We could connect to the show signal, but at least at the MNE end this will not fix the problem because we still risk creating a bunch of objects before show actually gets called.

For now (for us at least) it might be best just to not use VTK9 until they release new wheels with the fix / backport they're doing.

For now (for us at least) it might be best just to not use VTK9 until they release new wheels with the fix / backport they're doing.

I'm also having trouble with VTK9 on Linux with the render window refusing to close.
https://gitlab.kitware.com/vtk/vtk/-/issues/17917

Might be best to wait for the next set of wheels.

Might be best to wait for the next set of wheels.

Honestly, I have no idea when that could be though...

@larsoner and @akaszynski, what if we hardset pyvistaqt to have vtk<'9.0.0' in its setup.py until we can fix these things and/or the next set of wheels come out?

It would be good if platform selectors could be used like in pip (see for example this commit), but I've never tried to do this in setup.py so I'm not sure how feasible it is.

FYI VTK 9.0.1 is now available on PyPi, but it still renders some garbage for me :(

FYI VTK 9.0.1 is now available on PyPi, but it still renders some garbage for me :(

Also still having issues with render windows closing on Linux.

FYI VTK 9.0.1 is now available on PyPi, but it still renders some garbage for me

VTK 9.0.1 is working all fine for me on mac with BackgroundPlotter. It seems to have fixed all of my issues.. @larsoner, can you share what exactly is going awry for you over in #15