[vtk-developers] Strange renderering with mixed polydata/volume with QVTKOpenGLWidget

Utkarsh Ayachit utkarsh.ayachit at kitware.com
Thu May 18 10:16:59 EDT 2017


Okay. In that case, it may be best if you can put together a small example
to reproduce the issue so we can debug it here.

Utkarsh

On Thu, May 18, 2017 at 10:14 AM, Elvis Stansvik <
elvis.stansvik at orexplore.com> wrote:

> 2017-05-18 15:59 GMT+02:00 Utkarsh Ayachit <utkarsh.ayachit at kitware.com>:
> > For now, try doing this:
> >   auto surfaceFormat = QVTKOpenGLWidget::defaultFormat()
> >   surfaceFormat.setSamples(0);
> >   surfaceFormat.setAlphaBufferSIze(0);
> >   QSurfaceFormat::setDefaultFormat(surfaceFormat);
>
> Thanks for the suggestion. I tried it out on the Mac, but it looks
> like it made no difference :/
>
> Elvis
>
> >
> >
> > Utkarsh
> >
> > On Thu, May 18, 2017 at 8:57 AM, Elvis Stansvik
> > <elvis.stansvik at orexplore.com> wrote:
> >>
> >> I'm porting our program to the new QVTKOpenGLWidget.
> >>
> >> In one place, we're using a semi-transparent polygonal cube to show
> >> the selection of an area. We're doing volume rendering using
> >> vtkGPUVolumeRayCastMapper in the same renderer, and the polygonal
> >> selection marker is enclosing the volume in the X/Y dimensions.
> >>
> >> See the attached linux_selection_correct.png for how this is supposed
> >> to look, and you'll understand what I mean. The light blue area is the
> >> selection marker.
> >>
> >> This has always worked fine, but after porting from QVTKWidget to
> >> QVTKOpenGLWidget, the rendering looks strange on Windows (nvidia) and
> >> macOS (2013 MBP, intel iris). See the attached
> >> windows_nvidia_selection.png and macos_selection.png.
> >>
> >> The selection is visualized using
> >>
> >>   vtkCubeSource -> vtkPolyDataMapper
> >>
> >> and a vtkActor configured like this:
> >>
> >>     auto selectionColor = palette().color(QPalette::Highlight);
> >>
> >>     m_selectionMarkerActor->SetMapper(selectionMarkerMapper);
> >>     m_selectionMarkerActor->GetProperty()->SetColor(
> selectionColor.redF(),
> >>
> >> selectionColor.greenF(),
> >>
> >> selectionColor.blueF());
> >>     m_selectionMarkerActor->GetProperty()->SetOpacity(0.1);
> >>     m_selectionMarkerActor->GetProperty()->SetAmbient(1.0);
> >>     m_selectionMarkerActor->GetProperty()->SetDiffuse(0.0);
> >>     m_selectionMarkerActor->GetProperty()->SetSpecular(0.0);
> >>
> >> Any idea why the rendering looks so strange on Windows/nvidia and
> >> macOS/iris, respectively, when using the new widget class?
> >>
> >> We're using a recent VTK from Git master.
> >>
> >> We're doing the recommended
> >>
> >>     QSurfaceFormat::setDefaultFormat(QVTKOpenGLWidget::
> defaultFormat());
> >>
> >> to set the default surface format before QApplication construction.
> >>
> >> In the particular QVTKOpenGLWidget used here, we modify the format with
> >>
> >>     auto surfaceFormat = format();
> >>     surfaceFormat.setSamples(0);
> >>     setFormat(surfaceFormat);
> >>
> >> to disable multisampling.
> >>
> >> Very grateful for any advise on how to solve this.
> >>
> >> Cheers,
> >> Elvis
> >>
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