[vtkusers] Polydata to Image - vtkWindowToImageFilter

[Bernhard Mayrhofer]

Hi!

I use now vtkWindowToImageFilter to get an image of a polydata object. It 
works fine. I want to speed up it. I found that this->Input->Render(); in 
vtkWindowToImageFilter.cpp costs most time. The data is rendered and is 
displayed. Could it be faster if this is not displayed (if it is an option 
the skip this part)? If yes, how can this be done?

Thanks
Bernhard