[Paraview] Getting original node's id's

[David E DeMarle]

In your filter, you can add an array in which each point is given its
own unique index and mark it as the Active GlobalId array.
vtkDataSetAttributes::SetGlobalIds(the new array).

Paraview is careful about preserving this array and at extracting
cells/points based on it's contents. So at any point downstream (after
the threshold for example) you can look at its contents to figure out
exactly where each cell/point originally came from.

On Mon, Sep 15, 2008 at 9:59 AM, Rafael March <rafaelmarch3 at yahoo.com> wrote:
> Hey Paraview Community,
>
> I have a filter that receives an UnstructuredGrid as input, and associates
> an integer number (according to some rule, of course) to each Point of the
> mesh. So, I can use the Threshold filter to separate a piece of my model
> from the rest (for instance, I can filter my model in order to show only the
> nodes whose integer number is 6). The problem is, when I use this filter,
> Paraview atributtes new id's to the nodes. I would like to maintain the
> original numbers !
>
> Does anybody know how to solve this problem ? I thought that I might store
> the point's memory address so that I can walk through the pipeline later and
> recover the id, but I don't think Paraview maintain these addresses either.
>
> Thanks in advance.
>
> Rafael March.
>
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