[vtkusers] vtkHardwareSelector blacking out window with QVTKOpenGLWidget

[King, Franklin]

I've attached the small example. It's identical to the working ExtractVisibleCells example except for the small addition of the QVTKOpenGLWidget and using its render window rather than having one standalone.


I'm actually using this version of VTK 9 (https://github.com/Slicer/VTK/tree/slicer-v9.0.0-2018-04-17-10e8cdc) which seems to date back to April 2018.


Thanks,


Franklin

________________________________
From: Ken Martin <ken.martin at kitware.com>
Sent: Wednesday, July 18, 2018 2:48:44 PM
To: King, Franklin
Cc: vtkusers at public.kitware.com
Subject: Re: [vtkusers] vtkHardwareSelector blacking out window with QVTKOpenGLWidget


        External Email - Use Caution

How recent is the VTK you tried with, there were significant changes made to this code in the past week?  Can you zip up a small example I could build and try?

On Wed, Jul 18, 2018 at 1:31 PM, King, Franklin <fking1 at bwh.harvard.edu<mailto:fking1 at bwh.harvard.edu>> wrote:

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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