[vtkusers] vtkHardwareSelector blacking out window with QVTKOpenGLWidget

[King, Franklin]

Hi,


I've been attempting to run what is essentially this example of extracting visible cells using vtkHardwareSelector (https://www.vtk.org/Wiki/VTK/Examples/Cxx/Filtering/ExtractVisibleCells) but with the render window displayed within a QVTKOpenGLWidge instead.


Doing so, however, results in the entire window failing to render and appearing black upon this line:

vtkSelection* selection = selector->Select();

I've tried disabling multisampling with both QSurfaceFormat and vtkRenderWindow to no avail.


The window does, however, briefly render correctly (and the selection appearing successful) upon resizing events. Curiously, with a debug build it also renders correctly upon calling Select() again.


I am using VTK 9 with Qt 5.10.1, and I've confirmed that there is no issue when implementing with just a vtkRenderWindow or using QVTKWidget in VTK 7. Any idea as to what is going wrong?


Thanks,


Franklin


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