[vtkusers] vtkHardwareSelector blacking out window with QVTKOpenGLWidget

Ken Martin ken.martin at kitware.com
Wed Jul 18 14:48:44 EDT 2018

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>

> 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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Ken Martin PhD
Distinguished Engineer
Kitware Inc.
101 East Weaver Street
Carrboro, North Carolina
27510 USA

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