[vtkusers] update confusion

Sven sven.prevrhal at oarg.ucsf.edu
Mon Oct 30 19:35:20 EST 2000

I am totally confused by how update works.
It seems when I display a slice of an image volume in a TkImageViewerWidget
every time I go to a different slice the imaging chain executes again!
Sometimes, it doesn't execute at all and I receive a "Pixel .. not in memory
error! How can I have the chain execute one for the whole volume independent
on what's on the screen?


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