[vtkusers] a question about save vtkRenderWindow as JPEG file...

[steelblue]

hi everyone:

   i have problem about save vtkRenderWindow as JPEG file,
   this is my code:

                 vtkRenderWindow
renWin=vtkpanel.getRenderWindow();//vtkpanel is a vtkPanel
                 vtkWindowToImageFilter w2i =new vtkWindowToImageFilter();		   
		 w2i.SetInput(renWin);
		 w2i.Modified();
		 vtkJPEGWriter writer =new  vtkJPEGWriter();
		 writer.SetInput(w2i.GetOutput());
		 writer.SetFileName("f://vtk.jpg");
		 writer.Write();

  but the result only a JPEG file that is black,total black ,,..

  the problem bothered me so much,,who can give me a solution......
  thanks so so much!!

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