[vtkusers] Offscreen and onscreen rendering outputs don't match

[Kevin H. Hobbs]

On Thu, 2006-05-18 at 22:40 -0400, Viksit Gaur wrote:
> Hi all
> 
> a) I'm using a vtkWindowToImageFilter object to write the current 
> rendered output from a render window of type vtkTkRenderWidget. I seem 
> to get all the code right, except that when rendering an animation, only 
> the first frame gets written. 

This is specifically mentioned in the documentation.

http://www.vtk.org/doc/nightly/html/classvtkWindowToImageFilter.html

The short answer is: "To force an update of the output image, call
vtkWindowToImageFilter's Modified method after rendering to the window."
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