[vtkusers] How to save renWin output in vtk format?

[shahrooz Roohi]

Dear all 
  I want to save my output of visualization (Volume rendering or surface rendering)
  to vtk format. but I don't know which class I should use and the input of class.
  I test vtkDataObjectWriter class with inputs renWin, ren1 and volume, but it didn't work. How can I solve this problem? 
   
  vtkRenderer *ren1 = vtkRenderer::New();
  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->AddRenderer(ren1);
  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);
   
  ren1->AddActor(outline);
  ren1->AddVolume(volume);
  ren1->SetActiveCamera(aCamera);
  ren1->ResetCamera ();
  aCamera->Dolly(1.5);
  ren1->SetBackground(1,1,1);
  renWin->SetSize(640, 480);
   
  vtkDataObjectWriter *writer=vtkDataObjectWriter::New();
  writer->SetInput(renWin->GetOutput());
   

 		
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