[vtkusers] Update() vs. UpdateWholeExtent()

[chrisyeshi]

So, in my understanding, extent is a bounding box.

SetUpdateExtent() / SetOutputExtent() will set a bounding box which is
smaller than the whole extent.
As a result, Update() will only update the smaller bounding box.

Am I correct?

When I use Update() instead of UpdateWholeExtent(),
I am getting "ERROR: ****: Updateextent does not lie within whole extent"
"Update extent is: 0, 255, 0, 127, 0, 0"
"Whole extent is: 0, 63, 0, 63, 0, 0"
It was somebody else's codes, so I am trying to figure out what's wrong.
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