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

Tue Oct 17 09:24:15 EDT 2017

Hello Sankhesh,
thanks a lot for the reply.
Let's say the GUI "pipeline" is as I explained to Elvis. Then:
At the moment the two widgets are under the central widget (a QWidget). They are in two different tabs of a QTabWidget. I tried to move the QVTKWidget out of its tab but no luck. I have also noted another thing. If I show at the same time the QWidget and the QVTKWidget, the QVTKWidget works fine, but the QWidget freeze. That's why I thought that it could be an OpenGL context issue.
What do you mean by "replacing ROS widget with a simple button"? In any case, I can make QVTKWidget work, but no success with the QWidget. It just freeze on the last view.Unfortunately, QVTKOpenGLWidget is available only for VTK 8.0 and higher. I am using VTK 7.1 and I cannot upgrade to 8.0 because of the cmake that is installed on my laptop. I cannot upgrade the cmake version due to some compatibility issues with ROS. I will get in a lot of trouble if I try to do that. Is there a way to use glut or vtkOpenGLRenderer (available in vtk 7.1)?Thanks a lot again for the help.
Best,
Luca

----Messaggio originale----

Da: "Sankhesh Jhaveri" <sankhesh.jhaveri at kitware.com>

Data: 17-ott-2017 14.21

A: "Elvis Stansvik"<elvis.stansvik at orexplore.com>, "bartolomei-luca at virgilio.it"<bartolomei-luca at virgilio.it>

Cc: "VTK Users"<vtkusers at vtk.org>

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

Hi Luca,

Do the QWidget and QVTKWidget overlap at all or are they separated by some QFrame border, etc. ? If they are not overlapping, it means they are not sharing the OpenGL context.

Have you tried replacing the ROS widget with a simple button to see if the QVTKWidget works properly?

Lastly, the QVTKWidget is known to have rendering issues with Qt5. Try using the QVTKOpenGLWidget to see if anything changes.

Best,
Sankhesh

On Tue, Oct 17, 2017 at 3:29 AM Elvis Stansvik <elvis.stansvik at orexplore.com> wrote:
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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-- 
Sankhesh Jhaveri
Sr. Research & Development Engineer | Kitware | (518) 881-4417

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