[Paraview] ExtractSelection loses selection order

[David Doria]

On Wed, Jan 20, 2010 at 9:58 AM, David E DeMarle
<dave.demarle at kitware.com>wrote:

> It was not meant to be preserved. For performance reasons the
> extraction filter (vtkExtractSelectedIds specifically) sorts both the
> selection list and the element id array so that it can do a quick
> lookup of the usually numerous entries in the selection list.
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109
>
>
>
> On Tue, Jan 19, 2010 at 1:37 PM, David Doria <daviddoria at gmail.com> wrote:
> > On Mon, Jan 18, 2010 at 12:31 PM, David Doria <daviddoria at gmail.com>
> wrote:
> >>
> >> If I select 3 points and then use the ExtractSelection filter, I would
> >> expect the IDs of the points to be 0,1,2, in the order selected.
> >> Instead, they are 2, 0, 1.
> >>
> >> Is there any way to prevent this? I am trying to set corresponding
> >> landmarks, so the order is important, and it is being lost.
> >>
> >> Thanks,
> >>
> >> David
> >
> > Here is a demo of the problem:
> >
> > http://www.rpi.edu/~doriad/Paraview_List/ExtractSelection/
> >
> > points.vtp contains 10 points, (0-9). I selected points 9, 8, 7, in that
> > order and extracted the selection. The result (extracted.vtp) has the 3
> > extracted points (corresponding to 9,8,7) ordered 2, 1, 0, rather than 0,
> 1,
> > 2, which was the selection order.
> >
> > Is this a bug or was the ordered never intended to be preserved?
> >
> > Thanks,
> >
> > David
> >
>
>
I see. Is there any other way in Paraview I can get a list of points in the
order I click/select them?

Thanks,

David
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