[vtkusers] Opacity problems with vtkOSPRayPass

[Martina Litterio]

Hi all!

I have a problem using vtkOSPRayPass. I'm reading a DICOM series with
vtkDICOMImageReader.

My code is :

..bla bla bla

vtkNew<vtkGPUVolumeRayCastMapper> volumeMapper;

    volumeMapper->SetAutoAdjustSampleDistances(0);

    volumeMapper->SetSampleDistance(0.5);



    vtkDICOMImageReader* reader = vtkDICOMImageReader::New();

    reader->SetDirectoryName("Path/to/my/DICOM");

    reader->Update();

    volumeMapper->SetInputConnection(reader->GetOutputPort());



    volumeMapper->AddObserver(vtkCommand::ErrorEvent, errorObserver);

   vtkNew<vtkPiecewiseFunction> pwf;

    pwf->AddPoint(-3024, 0.0);

    pwf->AddPoint(-16, 0.0);

    pwf->AddPoint(641, 0.05);

    pwf->AddPoint(3071, 0.1);



    ctf->AddRGBPoint( -3024, 0, 0, 0, 0.5, 0.0 );

    ctf->AddRGBPoint( -16, 0.73, 0.25, 0.30, 0.49, .61 );

    ctf->AddRGBPoint( 641, .90, .82, .56, .5, 0.0 );

    ctf->AddRGBPoint( 3071, 1, 1, 1, .5, 0.0 );



    volumeProperty->SetColor(ctf);

    volumeProperty->SetScalarOpacity(pwf);

    volumeProperty->SetShade(0);

    volumeProperty->SetScalarOpacityUnitDistance(1.732);



    vtkNew<vtkVolume> volume;

    volume->SetMapper(volumeMapper);

    volume->SetProperty(volumeProperty);



    // Create the renderwindow, interactor and renderer

    vtkNew<vtkRenderWindow> renderWindow;

    renderWindow->SetMultiSamples(0);

    renderWindow->SetSize(401, 399); // NPOT size



    vtkNew<vtkRenderer> renderer;

    renderer->SetBackground(0.3, 0.3, 0.4);

    renderWindow->AddRenderer(renderer);



    renderer->AddVolume(volume);

    renderer->ResetCamera();

    renderWindow->Render();



    // Attach OSPRay render pass

    vtkNew<vtkOSPRayPass> osprayPass;

    if (useOSP)

    {

        renderer->SetPass(osprayPass);

    }

   vtkNew<vtkRenderWindowInteractor> iren;

    iren->SetRenderWindow(renderWindow);

    vtkNew<vtkInteractorStyleTrackballCamera> style;

    iren->SetInteractorStyle(style);

    iren->Start();

... bla bla bla


Now, the problem is the following. If "useOSP"==FALSE, I have a certain
opacity (the which one I would like to have in my results); if
"useOSP"==TRUE, I have a different opacity and I'm not able to manage it as
I want.

Can you please tell me what's wrong in my code?


​Thanks to everyone!​


*Martina Li**tterio*
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