[vtkusers] QVTKOpenGLWidget and QWidgets

[Sam Raby]

I am running the following example of using QVTKOpenGLWidget to display a
sphere.

https://www.vtk.org/Wiki/VTK/Examples/Cxx/Qt/SideBySideRenderWindowsQt

It works fine. Then I added one QT Checkbox. but the checkbox is not
checkable. After debugging I realized that when I remove the following line
of code, the checkbox starts working but QVTKOpenGLWidget does not display
the sphere anymore. Is that something that I am missing here. QSlicer and
other qwidgets also do not work if I keep the following like of code:

    QSurfaceFormat::setDefaultFormat(QVTKOpenGLWidget::defaultFormat());


Thanks

S
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