[vtkusers] How can i save single renderer as a picture ?

[谢 谢]

I want to save a  single render as a picture,when there are several 
renderer in a renderWindow .How can i do?Though  i
know the following code can save renderwindow as a
picture,i couldnt write right code.

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



Thank you very much!

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