[vtkusers] Problem with volume rendering inside of Qt application

[Aashish Chaudhary]

On Tue, Feb 17, 2015 at 11:12 AM, Ernesto Guevara <elguevara at uci.cu> wrote:

> Hi, I'm afraid cannot use OpenGL2 backend since I'm using VTK 5.10, is
> there any other way to do this???
> I tried Andrea’s solution but I’m getting the message that the application
> couldn’t load the GL_ARB_compatibility extension. I checked with glxinfo
> and that extension is supported in my system, I can render the volume quite
> well without QT. I’m using VTK 5.10 with Ubuntu 14.10. do to this I cannot
> use QVTKWidget2.
> I can’t use vtkOpenGLRenderWindow because it is an abstract class I used
> vtkGenericOpenGLRenderWindow.
> I’ll keep trying.
>

You shouldn't use the vtkOpenGLRenderWindow class, just use the
vtkRenderWindow::New() which will create the concrete class for you. You
may want to debug why its loading the compatability profile.


>
> Thanks
> Ernesto
>
> PS: I just sent this message to Andrea, sorry about duplicates.
>
> De: Andrea Brambilla [mailto:andrea.bram at gmail.com]
> Enviado el: Tuesday, February 17, 2015 9:11 AM
> Para: Aashish Chaudhary
> CC: Ernesto; vtkusers at public.kitware.com
> Asunto: Re: [vtkusers] Problem with volume rendering inside of Qt
> application
>
> I had a similar issue with QVTKWidget some time ago, which was due to
> OpenGL
> I solved the issue by checking for the available extensions when creating
> the QVTKWidget:
>
> QVTKWidget* createQVTKWidget(QWidget *parent)
> {
>     // create a RenderWindow and loads the compatibility profile on it
>     auto extManager= vtkSmartPointer<vtkOpenGLExtensionManager>::New();
>     auto renWin = vtkOpenGLRenderWindow::New();
>     extManager->SetRenderWindow(renWin);
>     if(extManager->ExtensionSupported("GL_ARB_compatibility" ) != 0)
>         extManager->LoadExtension("GL_ARB_compatibility");
>     else
>         ep::log << "Warning: GL_ARB_compatibility extension cannot be
> loaded" << endl;
>
>     // Create and add a renderer to the managed render window
>     auto ren = vtkOpenGLRenderer::New();
>     ren->SetBackground(1, 1, 1);
>     renWin->AddRenderer(ren);
>     /// Create the QVTKWidget and adds the managed render window to it
>     auto outWidget = new QVTKWidget(parent);
>     outWidget->SetRenderWindow(renWin);
>
>     assert(renWin->GetInteractor());
>     renWin->Delete();
>     ren->Delete();
>     return outWidget;
> }
>
> On Tue, Feb 17, 2015 at 2:57 PM, Aashish Chaudhary <
> aashish.chaudhary at kitware.com> wrote:
> If you are using older version of volume mapper (OpenGL backend) then it
> is possible that when using QT window, it's not finding the extensions its
> needed. Is it possible for you to try the OpenGL2 backend?
>
> Also, Do you see any error message on the console?
>
> Thanks,
>
>
> On Mon, Feb 16, 2015 at 4:59 PM, Ernesto <elguevara at uci.cu> wrote:
> Jakub Łągwa <kubalagwa <at> gmail.com> writes:
>
> >
> > Hello,
> > I have a strange problem with showing VTK volume in QVTKWidget. I can
> compile example such as as:
> >
> http://vtk.org/gitweb?p=VTK.git;a=blob;f=Examples/Medical/Cxx/Medical4.cxxand
>
>
> >  it work fine. But when I want to use exactly the same code in my sample
> >  Qt application (let's say - render only after user press a button)
> > nothing is shown in QVTKWidget (I tried also with QVTKInteractor instead
> >  of the one from example). I have this problem only when I want to use
> > vtkVolume and than add the volume to renderer with AddVolume. If I make
> > other 3D visualisation for example with vtkContourFilter and than I add
> > it to renderer with AddActor method - everything works fine.
> > I was trying to solve this problem for a couple of days but I found
> > some things that I can't understand in any way. If I take, for example,
> > Medical4.cxx file and add there
> > #include <QApplication>
> > and than
>
>
> Hello Jakub I have the same problem with QVTKWidget and can't find a
> solution I've been stopped for 4 days. I need to know whether you managed
> to
> solve this problem and how did you solved it.
>
> Thanks in advance.
> Ernesto
>
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>
> --
> | Aashish Chaudhary
> | Technical Leader
> | Kitware Inc.
> | http://www.kitware.com/company/team/chaudhary.html
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
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>
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-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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