[vtkusers] How can i save single viewport ?

[孟玮 谢]

i want to save single viewport .How can i do,though  i
know the following code can save renderwindow as a
picture.

vtkWindowToImageFilter
*w2i=vtkWindowToImageFilter::New();
  w2i->SetInput(ren1);
  
  vtkJPEGWriter *writer=vtkJPEGWriter::New();
  writer->SetInput(w2i->GetOutput());
  writer->SetFileName( "/root/document/n.jpg");
  writer->Write();





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