[vtkusers] Get number of cells

[Amy Squillacote]

Because that sort of information about the structure of the dataset is 
not available until the filter/source/reader executes, and this happens 
when Update() is called (either manually by you or when Render or some 
other method calls Update on the pipeline).

- Amy

Isidro Moreno wrote:
> Thanks! It worked! I'm a newbe, so..
>
> Is there any criterion to use Update()? If I can draw the line without 
> using it, why must I call Update to know the dataset structure, like 
> num of cells?
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-- 
Amy Squillacote
Kitware, Inc.
28 Corporate Drive
Clifton Park, NY 12065
Phone: (518) 371-3971 x106