[vtkusers] question about vtkImageFlip

[francesco caruso]

Hello

I'd like to know why I can get a pointer to the scalar in a vtkImageData 
with method imageData->GetScalarPointer(0,0,0), but I can't get it after 
I flip that with vtkImageFlip->GetOutput()->GetScalarPointer(0,0,0)

Thanks in advance