[vtk-developers] What is cell list size in vtk file?

[David E DeMarle]

" (i.e., sum of numPoints and connectivity indices over each cell)." means:
Size = Add up the entries for the numcells cells, where each cell has
1+numpoints entries.

For a polydata with one triangle then:
POLYGONS 1 4
3 0 1 2

For a polydata with one quad then:
POLYGONS 1 5
4 0 1 2 3

For a polydata with one triangle and one quad:
POLYGONS 2 9
3 0 1 2
4 0 1 2 3

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Tue, Aug 14, 2012 at 11:05 AM, r_karim <rashed.karim at gmail.com> wrote:
> I have examined the contents of a VTK polydata file and I dont understand
> this entry:
>
> POLYGONS n size
> ...
> ...
> ...
>
> What is size? In documentation it says it is "the cell list size and thus
> total number of integer values required to represent the list (i.e. sum of
> numpoints and connectivity indices over each cell)".
>
> How can I derive this number from number of points and cells. What is the
> mathematical relationship?
>
> Best
> RK
>
>
>
> --
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