[vtkusers] R: Re: QVTKWidget in QT GUI freezes other QWidgets

[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 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/GLUTbut 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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