G4VtkOffscreenViewer.cc

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#include "G4VtkOffscreenViewer.hh"
#include "G4VtkSceneHandler.hh"
#include "G4VSceneHandler.hh"
 
#include <vtkWindowToImageFilter.h>
#include <vtkPNGWriter.h>
 
G4VtkOffscreenViewer::G4VtkOffscreenViewer(G4VSceneHandler& sceneHandler, const G4String& name)
  : G4VtkViewer(sceneHandler, name)
{
}
 
G4VtkOffscreenViewer::~G4VtkOffscreenViewer()
{
}
 
void G4VtkOffscreenViewer::Initialise()
{
  G4VtkViewer::Initialise();
  _renderWindow->SetOffScreenRendering(1);
}
 
void G4VtkOffscreenViewer::FinishView()
{
  auto& fVtkSceneHandler = dynamic_cast<G4VtkSceneHandler&>(fSceneHandler);
  fVtkSceneHandler.Modified();
 
  _renderWindow->Render();
 
  vtkNew<vtkWindowToImageFilter> windowToImageFilter;
  windowToImageFilter->SetInput(_renderWindow);
  windowToImageFilter->Update();
 
  vtkNew<vtkPNGWriter> writer;
  writer->SetFileName("offscreen.png");
  writer->SetInputConnection(windowToImageFilter->GetOutputPort());
  writer->Write();
}