[vtkusers] Progress and reader->Update()

[TJ Wilkinson]

Sometimes I call the Update() method on a vtkImageReader, and it takes a
while to load.  This is expected, since the datasets are sometimes over
400 MB, but is there a good way that I can obtain the progress of the
reader while it's updating so the users has an idea as to how long it will
take?

Thank you.

Sincerely,

Todd