[vtkusers] [vtk-users] urgent! range image as double

[Bruno Oliveira]

Hello,

I need to get the zbuffer in double or single precision float. This is what
I'm doing



    renderWindow->Render();

    vtkSmartPointer<vtkWindowToImageFilter> filter =
             vtkSmartPointer<vtkWindowToImageFilter>::New();
    vtkSmartPointer<vtkImageShiftScale> scale =
            vtkSmartPointer<vtkImageShiftScale>::New();

    // Filter Object Setup
    filter->SetInput(renderWindow);
    filter->SetMagnification(1);
    filter->SetInputBufferTypeToZBuffer();    //Extract z buffer value
    filter->ReadFrontBufferOff(); // read from the back buffer
    filter->Update();

    // Scale Object Setup
    scale->SetOutputScalarTypeToDouble();
    scale->SetInputConnection(filter->GetOutputPort());
    scale->SetShift(0);


    auto rawData = filter->GetOutput();
    rawData->Register(nullptr); // !!! Increase reference counter, make
returned Image struct
                                // responsible for freeing the memory
afterwards

    int dims[3];
    // Returns coords in (x, y) instead of (row, col)
    rawData->GetDimensions(dims);

    assert(rawData->GetNumberOfScalarComponents() == 1);


double *rawData = rawData->GetScalarPointer();





However, this is causing a segmentation fault. What am I doing wrong?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20160506/bf6cadfa/attachment.html>