[vtkusers] vtkWindowToImageFilter ignores vtkBillboardTextActor3D actors from renderer

[M. Jordan]

Hi,

I use the following lines of code to save the screen to a .png file.


    // set up screenshot
    vtkSmartPointer<vtkWindowToImageFilter> windowToImageFilter =
    vtkSmartPointer<vtkWindowToImageFilter>::New();
    windowToImageFilter->SetInput(renderer->GetRenderWindow());
    //set the resolution of the output image
    windowToImageFilter->SetMagnification(Quality);
    //also record the alpha (transparency) channel
    windowToImageFilter->SetInputBufferTypeToRGBA();
    // read from the back buffer
    windowToImageFilter->ReadFrontBufferOff();
    windowToImageFilter->Update();
    // write image
    vtkSmartPointer<vtkPNGWriter> writer =
    vtkSmartPointer<vtkPNGWriter>::New();
    QString full_path = Path + "/Screenshot_" + QTime::currentTime().toString().remove(":") + ".png";
    writer->SetFileName(full_path.toStdString().c_str());
    writer->SetInputConnection(windowToImageFilter->GetOutputPort());
    writer->Write();

Everything works great but the vtkBillboardTextActor3D actors are not part of the resulting image.
(Of course I added them to the renderer and I can see the text on the screen!)

What could be the problem?

Thank you!



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