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

[Elvis Stansvik]

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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>