[vtkusers] QVTKOpenGLWidget and QWidgets

[Shawn Waldon]

Hi Sam,

I know there are still some issues with the QVTKOpenGLWidget, but I've
never heard of this one before.  There is ongoing work [1] to improve the
QVTKOpenGLWidget.  You might try building with that branch and see if it
improves things.

Shawn

[1]: https://gitlab.kitware.com/vtk/vtk/merge_requests/3745

On Sun, May 6, 2018 at 10:15 AM, Sam Raby <rabysam28 at gmail.com> wrote:

> *The solution I found was to disable multisampling on the QSurfaceFormat
> before setting the default surface format, meaning to replace the
> following:*
>
> QSurfaceFormat::setDefaultFormat(QVTKOpenGLWidget::defaultFormat());
>
> *with the following:*
>
> QSurfaceFormat fmt = QVTKOpenGLWidget::defaultFormat();
> fmt.setSamples(0);
> QSurfaceFormat::setDefaultFormat(fmt);
>
> *This was a solution to another problem that I found on this link:*
> http://vtk.1045678.n5.nabble.com/Issues-using-QVTKOpenGLWidget-td5745401.
> html
>
> *Would anyone explain why this fixes the issue and if there is any
> consequence to this?*
>
> *Thanks*
>
>
>
>
> On Sat, May 5, 2018 at 5:20 PM, Todd <nztoddler at yahoo.com> wrote:
>
>> Is the checkbox widget placed within the render window boundary?
>>
>> It sounds like the vtk render window is capturing the mouse events. I'm
>> not familiar with Qt but it seems that the solution would be to grab the
>> mouse event position in your vtk render widow event handler and reroute the
>> event to the widget that bounds that location.
>>
>> On 5 May 2018 9:01 a.m., Sam Raby <rabysam28 at gmail.com> wrote:
>>
>> Let me rephrase the issue that I am observing. I run the following vtk
>> example that uses QVTKOpenGLWidget in Qt Creator. I can successfully run
>> the example. Then I added one simple QCheckBox to UI. I can compile the
>> code but the checkbox does not respond to mouse clicking, meaning that If I
>> click on the checkbox it does not get checked, but if I interact with the QVTKOpenGLWidget
>> it causes the checkbox to be updated. Is that a bug? because what I am
>> doing seems pretty basic.
>>
>> https://www.vtk.org/Wiki/VTK/Examples/Cxx/Qt/SideBySideRenderWindowsQt
>>
>> Thanks
>>
>>
>> On Friday, May 4, 2018, Sam Raby <rabysam28 at gmail.com> wrote:
>>
>>
>>
>> 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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