[vtkusers] RenderWindow->SaveImageAsPPM Functionality, and 3.x->4.0 hints

[Will Schroeder]

Hi John-

At 08:15 AM 12/20/2001 -0600, John Washbourne wrote:

>Are there any 3.x->4.0 migration hints and I just didnt look
>hard enough? A couple quick pointers (like changing vtkScalars
>and vtkNormals to vtkDataArray) would be timesavers.

Look at the VTK FAQ section 6.7. Changes in VTK since 3.2. There is a link to
http://public.kitware.com/VTK/files/misc/Upgrading.zip
which describes the data attribute related changes. There is also a Perl 
script that can do the conversion for you.


>On to my question: I recompiled some code under 4.0 and
>discovered that the save image functionality in RenderWindow is
>gone. I tried a search on the archive, and the question has been
>asked before, but mostly gets 3.x answers
>(vtkRenderWindow->SaveImageAsPPM()). I see a method of several
>steps involving vtkWindowToImageFilter and vtkImageWriter. Is
>this the preferred method? Could someone please post a snippet
>of the new way to accomplish this?

Yes, grab the image from the render window, and then use something like the 
vtkTIFFWriter to save the image.

Will
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