[Paraview] Generate Ids filter gives Ids greater than number of points

[Evan Kao]

Sorry, nevermind.  It turns out I already had an 'Ids' array on my surface
and Generate Ids by default doesn't overwrite it.  When specifying a
different name, it works as expected.

On Mon, Oct 30, 2017 at 7:17 PM, Evan Kao <tossin at gmail.com> wrote:

> Hello all,
>
> I'm not sure if this is a bug, but the Generate Ids filter in Paraview is
> acting in an unexpected manner (currently using Paraview 5.4.0 installed
> from Windows binaries).  For some reason, it generates point IDs higher
> than the number of points on the surface.  The surface was extracted from a
> larger surface using the threshold filter.  So the pipeline is:
>
>    - Original Surface (19315 points) => Threshold Filter => Thresholded
>    Surface (13383 points)
>    - Thresholded Surface => Generate Ids Filter => Ids array has max Id
>    of 19049
>
> I also tested this in the Programmable Filter using vtkIdFilter.  This
> gave me a different result, the one I expected, where the max Id is 13382.
> Since the underlying VTK class to Generate Ids seems to be vtkIdFilter,
> this seems really strange.
>
> Should this be the case and if yes, why?  Is there a way to force Generate
> Ids to act like vtkIdFilter?
>
> Thanks for your time,
> Evan Kao
>
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