[Paraview] selected points change when clip plane changes

[David E DeMarle]

On Fri, Sep 14, 2012 at 8:36 AM, Zenker, Dr. Matthias
<Matthias.Zenker at erbe-med.com> wrote:
...
> Well, for me it doesn't work this way. When I move the clip plane and hit Apply, the selected points have changed positions also in the Extract Selection view.

I see that here too. All the way back to 3.8. I may be thinking about
3.4. A workaround is to save the output of the extract selection
filter and load it back in as a new dataset.

...
>> Yes every vtk filter creates a new object when the filter's parameters
>> change. Especially when the topology changes (consider the extreme
>> case of clipping away everything), there is no guarantee of
>> correspondence between indexes in the old and new result. That is why
>> the active surface selection, which picks out individual cells/points
>> by index, will change.
>
> Hmmm, IMHO this is counter-intuitive for the user, and would be worth improving...

Yes, but is a very deep change.

The global ids filter is meant to help with this sort of thing, as
those ids do not change arbitrarily across filters. But I can't seem
to get that to help this situation though.

>
> Matthias
>
>
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