[vtkusers] Repost-Please Help!: ShallowCopy vtkImageData

[gcope at engin.umich.edu]

Sorry for the re-post, but I'm really stuck and I know there are people that
have done this before!

>All-
>
>This should be an easy question for someone. I need an example of how to use
>ShallowCopy to break a pipeline and let the second half use the copy as input
>rather than having to re-compute the first half.
>
>I have successfully done this by doing the following:
>
>vtkPolyData *SavedData;
>FilterA->Update();
>SavedData->ShallowCopy(FilterA->GetOutput());
>FilterB->SetInput(SavedData);
>
>This works great when dealing with polydata, but when the type (and filter
>types) are changed to vtkImageData, nothing works. It has caused infinite loops
>and various runtime errors. What am I doing wrong?
>
>Thanks in advance,
>Jamie