<div dir="ltr"><div dir="ltr"><div dir="ltr">Hi Frank,<div>I am not entirely sure but looking at the code looks like you have to do</div><div>ren->AddViewProp(volume); instead of ren->AddVolume(volume);</div><div>have a look at <a href="https://lorensen.github.io/VTKExamples/site/Cxx/Medical/MedicalDemo4/">https://lorensen.github.io/VTKExamples/site/Cxx/Medical/MedicalDemo4/</a></div><div><br></div><div>Cheers,</div><div>Abhishek</div></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Nov 14, 2018 at 12:09 PM Franks <<a href="mailto:masterwangzx@gmail.com">masterwangzx@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
I want to test the volume mapper. I read the data from .vtk file and change<br>
its points attributes(vtkUnsignedCharArray with one component) to the<br>
vtkFloatArray with two components. Then I volume render it. But I get the<br>
"Segmentation fault". <br>
<br>
 auto reader = vtkSmartPointer<vtkStructuredPointsReader>::New();<br>
    reader->SetFileName("../mummy.128.vtk");<br>
    reader->Update();<br>
<br>
    auto tuples = vtkSmartPointer<vtkFloatArray>::New();<br>
    tuples->DeepCopy(reader->GetOutput()->GetPointData()->GetScalars());<br>
    tuples->SetNumberOfComponents(2);<br>
    for (int i = 0; i < tuples->GetNumberOfTuples(); ++i) {<br>
        tuples->SetTuple2(i,80,80);<br>
    }<br>
<br>
    reader->GetOutput()->GetPointData()->RemoveArray(0);<br>
    reader->GetOutput()->GetPointData()->SetScalars(tuples);<br>
<br>
    auto volumeMapper = vtkSmartPointer<vtkSmartVolumeMapper>::New();<br>
    volumeMapper->SetInputConnection(reader->GetOutputPort());<br>
<br>
    auto volumeProperty = vtkSmartPointer<vtkVolumeProperty>::New();<br>
<br>
    auto compositeOpacity = vtkSmartPointer<vtkPiecewiseFunction>::New();<br>
    compositeOpacity->AddPoint(40, 0.00);<br>
    compositeOpacity->AddPoint(60, 0.40);<br>
    volumeProperty->SetScalarOpacity(compositeOpacity);<br>
<br>
    auto color = vtkSmartPointer<vtkColorTransferFunction>::New();<br>
    color->AddRGBPoint(0.000, 0.00, 0.00, 0.00);<br>
    color->AddRGBPoint(64.00, 1.00, 0.52, 0.30);<br>
    volumeProperty->SetColor(color);<br>
<br>
    auto volume = vtkSmartPointer<vtkVolume>::New();<br>
    volume->SetMapper(volumeMapper);<br>
    volume->SetProperty(volumeProperty);<br>
<br>
    auto ren = vtkSmartPointer<vtkRenderer>::New();<br>
    ren->AddVolume(volume);<br>
    ren->SetBackground(1, 1, 1);<br>
<br>
    auto renWin = vtkSmartPointer<vtkRenderWindow>::New();<br>
    renWin->AddRenderer(ren);<br>
<br>
    auto style = vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();<br>
    auto iren = vtkSmartPointer<vtkRenderWindowInteractor>::New();<br>
    iren->SetRenderWindow(renWin);<br>
    iren->SetInteractorStyle(style);<br>
<br>
    iren->Initialize();<br>
    iren->Start();<br>
<br>
Best regards<br>
Frank<br>
<br>
<br>
<br>
--<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Abhishek<br><a href="http://zeroth.me" target="_blank">http://zeroth.me</a><br><br></div></div></div>