[vtkusers] save screenshot as png image

[Wang Q]

Hi guys,

I have found a simple yet executable example. In case anyone also wants it, here is the link: https://gist.github.com/certik/5687727



________________________________
From: Wang Q <wangq1979 at outlook.com>
Sent: 06 May 2016 21:15
To: VTK Users
Subject: save screenshot as png image


Hi guys,


I want to save screenshot as png image following the example. Unfortunately, the code went into windowToImageFilter->Update() method and never came back. Below is the snippet:


// Screenshot
    vtkSmartPointer<vtkWindowToImageFilter> windowToImageFilter =
        vtkSmartPointer<vtkWindowToImageFilter>::New();
    windowToImageFilter->SetInput(renderWindow);
    //windowToImageFilter->SetMagnification(3); //set the resolution of the output image (3 times the current resolution of vtk render window)
    //windowToImageFilter->SetInputBufferTypeToRGBA(); //also record the alpha (transparency) channel
    //windowToImageFilter->ReadFrontBufferOff(); // read from the back buffer
    windowToImageFilter->Update();

    vtkSmartPointer<vtkPNGWriter> writer =
        vtkSmartPointer<vtkPNGWriter>::New();
    writer->SetFileName("e:/screenshot2.png");
    writer->SetInputConnection(windowToImageFilter->GetOutputPort());
    writer->Write();

renderWindow->Render();
    timerLog->MarkEvent("finish rendering");
renderWindowInteractor->Start();


I am using win10, vtk6.3 on vc2013.


Any tips would be appreciated.


Cheers,


Chiang
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