[vtkusers] volume mapper error

[Abhishek]

Hi Frank,
I am not entirely sure but looking at the code looks like you have to do
ren->AddViewProp(volume); instead of ren->AddVolume(volume);
have a look at
https://lorensen.github.io/VTKExamples/site/Cxx/Medical/MedicalDemo4/

Cheers,
Abhishek

On Wed, Nov 14, 2018 at 12:09 PM Franks <masterwangzx at gmail.com> wrote:

> Hi,
> I want to test the volume mapper. I read the data from .vtk file and change
> its points attributes(vtkUnsignedCharArray with one component) to the
> vtkFloatArray with two components. Then I volume render it. But I get the
> "Segmentation fault".
>
>  auto reader = vtkSmartPointer<vtkStructuredPointsReader>::New();
>     reader->SetFileName("../mummy.128.vtk");
>     reader->Update();
>
>     auto tuples = vtkSmartPointer<vtkFloatArray>::New();
>     tuples->DeepCopy(reader->GetOutput()->GetPointData()->GetScalars());
>     tuples->SetNumberOfComponents(2);
>     for (int i = 0; i < tuples->GetNumberOfTuples(); ++i) {
>         tuples->SetTuple2(i,80,80);
>     }
>
>     reader->GetOutput()->GetPointData()->RemoveArray(0);
>     reader->GetOutput()->GetPointData()->SetScalars(tuples);
>
>     auto volumeMapper = vtkSmartPointer<vtkSmartVolumeMapper>::New();
>     volumeMapper->SetInputConnection(reader->GetOutputPort());
>
>     auto volumeProperty = vtkSmartPointer<vtkVolumeProperty>::New();
>
>     auto compositeOpacity = vtkSmartPointer<vtkPiecewiseFunction>::New();
>     compositeOpacity->AddPoint(40, 0.00);
>     compositeOpacity->AddPoint(60, 0.40);
>     volumeProperty->SetScalarOpacity(compositeOpacity);
>
>     auto color = vtkSmartPointer<vtkColorTransferFunction>::New();
>     color->AddRGBPoint(0.000, 0.00, 0.00, 0.00);
>     color->AddRGBPoint(64.00, 1.00, 0.52, 0.30);
>     volumeProperty->SetColor(color);
>
>     auto volume = vtkSmartPointer<vtkVolume>::New();
>     volume->SetMapper(volumeMapper);
>     volume->SetProperty(volumeProperty);
>
>     auto ren = vtkSmartPointer<vtkRenderer>::New();
>     ren->AddVolume(volume);
>     ren->SetBackground(1, 1, 1);
>
>     auto renWin = vtkSmartPointer<vtkRenderWindow>::New();
>     renWin->AddRenderer(ren);
>
>     auto style = vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();
>     auto iren = vtkSmartPointer<vtkRenderWindowInteractor>::New();
>     iren->SetRenderWindow(renWin);
>     iren->SetInteractorStyle(style);
>
>     iren->Initialize();
>     iren->Start();
>
> Best regards
> Frank
>
>
>
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-- 
Abhishek
http://zeroth.me
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