[vtkusers] QVTKOpenGLWidget and vtkImageViewer

[Utkarsh Ayachit]

I can see one thing missing, right of the bat. You need to do the following
before QApplication in instantiated.

*QSurfaceFormat::setDefaultFormat*(format);

Utkarsh

On Tue, Aug 1, 2017 at 1:49 PM, Olivier Commowick <
olivier.commowick at inria.fr> wrote:

> Hi everyone,
>
> I have been struggling with using QVTKOpenGLWidget to display an image
> with the vtkImageViewer. My problem is basically that the image is loaded
> and everything created but it seems the rendering is never triggered and
> thus the display is black.
>
> To summarize what I’ve done, I’ve created a vtkImageViewer3 which is the
> same as vtkImageViewer from VTK, only changing the vtkRenderWindow to be a
> vtkGenericOpenGLRenderWindow (required by the QVTKOpenGLWidget). I have
> then modified the ImageViewer example from VTK to match these new classes
> which gives the following code (see at the end). Oh, and I am using Qt5.7,
> and VTK 8.0 release.
>
> Would anyone have any clue on what could make this work (i.e. actually
> render something and display it) ?
>
> Thanks in advance
> Olivier
>
> ——
>
> Main.cxx code:
>
> #include <QApplication>
>
>
> #include "vtkImageViewer3.h"
>
> #include "vtkRenderWindowInteractor.h"
>
> #include "vtkRenderer.h"
>
> #include "vtkPNGReader.h"
>
>
> #include "QVTKOpenGLWidget.h"
>
> #include <QSurfaceFormat>
>
>
> int main(int argc, char** argv)
>
> {
>
>     QSurfaceFormat format = QVTKOpenGLWidget::defaultFormat();
>
>     format.setSamples(0);
>
>
>     QApplication app(argc, argv);
>
>
>     QVTKOpenGLWidget widget;
>
>     widget.setFormat(format);
>
>     widget.setEnableHiDPI(true);
>
>     widget.resize(256,256);
>
>
>     vtkPNGReader* reader = vtkPNGReader::New();
>
>     std::string fname = argv[1];
>
>     reader->SetFileName(fname.c_str());
>
>
>     vtkImageViewer3* image_view = vtkImageViewer3::New();
>
>     image_view->SetInputConnection(reader->GetOutputPort());
>
>
>     widget.SetRenderWindow(image_view->GetRenderWindow());
>
>     image_view->SetupInteractor(widget.GetRenderWindow()->GetInteractor());
>
>
>     image_view->SetColorLevel(138.5);
>
>     image_view->SetColorWindow(233);
>
>
>     widget.show();
>
>
>     app.exec();
>
>
>     image_view->Delete();
>
>     reader->Delete();
>
>
>     return 0;
>
> }
>
>
>
>
>
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/
> opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
> Search the list archives at: http://markmail.org/search/?q=vtkusers
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/vtkusers
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20170801/f0dc4410/attachment.html>