[vtkusers] QVTKWidget in QT GUI freezes other QWidgets

[Elvis Stansvik]

2017-10-17 9:22 GMT+02:00 bartolomei-luca at virgilio.it
<bartolomei-luca at virgilio.it>:
> Hello Elvis,
>
> thanks for your reply.
> I don't have the gui avaiable right now; I will send a picture as soon as I
> can.
>
> To answer your question: yes, if I remove the QVTKWidget and replace it with
> QWidget everything works. The problems occur only when the QVTKWidget is
> present.
>
> The GUI is built to work in this way:
> 1) start showing stuff on the QWidget;
> 2) After a while, the QVTKWidget shows some other stuff.
>
> The QWidget is showing some interactive scene and it uses a library
> ("librviz" - for ROS users) based on Ogre and OpenGL. Could the problem
> happen because the QVTKWidget interfere with the already existing OpenGL
> context?

I don't know, but it sounds like it's possible. I think there are
other people on this list who knows much more about OpenGL and how VTK
uses it than I do, so I'll let those answer that.

Elvis

> I don't know if this is the cause, because it is sufficient to have the
> QVTKWidget on the Gui to make the QWidget freeze.
>
> Anyway, I have looked at this example:
> https://www.vtk.org/Wiki/VTK/Examples/Cxx/GLUT
> but no luck so far. Maybe is a problem of drivers (I have an Nvidia GeForce
> GTX 950M on Ubuntu 14.04 LTS).
>
> Best,
> Luca
>
>
> ----Messaggio originale----
> Da: "Elvis Stansvik" <elvis.stansvik at orexplore.com>
> Data: 17-ott-2017 8.36
> A: <bartolomei-luca at virgilio.it>
> Cc: "VTK Users"<vtkusers at vtk.org>
> Ogg: Re: [vtkusers] QVTKWidget in QT GUI freezes other QWidgets
>
>
> Den 13 okt. 2017 12:08 em skrev "bartolomei-luca at virgilio.it"
> <bartolomei-luca at virgilio.it>:
>
> Hello everyone!
>
> I have a problem with the QT GUI I am creating. Basically, I have an
> interactive QWidget, a QVTKWidget and a "Quit" button.
>
> When I launch my app, I can interact with the QWidget without any problem (I
> have a 3D interactive scene, where I can zoom and rotate).
> However, as soon as the QVTKWidget becomes "active" (i.e. some function in
> my code start using it or if I click on it), both the QWidget and the
> QVTKWidget freeze. The app keeps on working, since the "Quit" button works
> as it should.
>
> If I have a GUI with either the QWidget or the QVTKWidget (only one of them)
> everything works fine. The problem is if I try to include both of them at
> the same time.
>
> Do you have any idea why this happens?
>
>
> I don't have any immediate ideas. It would really help to see a small
> example where the problem occurs.
>
> Does it work if you put two of your QWidgets in the application. I mean, if
> you remove the QVTKWidget and put another one of your QWidget where it was?
>
> Elvis
>
>
> Thanks a lot for you help.
>
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