[vtkusers] Question on using vtkMFCWindow, vtkWindowToImageFilter, and vtkTIFFWriter

[James Weng]

Dear All,
   
  I am using vtkMFCWindow, vtkVolume16Reader, vtkContourFilter, for a 3D GUI rendering of a raw image volume data. It works fine (the rendered object¡¯s center is in the GUI window¡¯s center). However, after I add the code using vtkWindowToImageFilter, vtkTIFFWriter to save the render window content, there is a problem. In the GUI window, the position of the rendered object is shifted and the object is enlarged (object is scaled larger by several times, and its lower-left corner is in the GUI window center). So is the saved image file.
   
  The added code is as the following,
   
  ////////////////// 
  this->pvtkWindowToImageFilter->SetInput(this->pvtkMFCWindow->GetRenderWindow());
   
  
  this->pvtkTIFFWriter->SetInput(this->pvtkWindowToImageFilter->GetOutput());
   
  this->pvtkTIFFWriter->SetFileName(¡°screen_image.tif¡±);      
   
  this->pvtkTIFFWriter->Write();
  //////////////
   
  I do not know what causes the problem, and how to correct it. 
  Thanks a lot for any suggestion.
   
  James

 
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