[vtk-developers] is vtkSelectionSource::SetInverse broken?

[Jeff Baumes]

I was able to reproduce this. It was a bug in that filter (actually, the bug
is in vtkConvertSelection). Threshold selections were being double-negated.
The fix is now committed to VTK master.

Jeff

On Thu, Feb 3, 2011 at 11:20 AM, David E DeMarle
<dave.demarle at kitware.com>wrote:

> I am guessing that vtkExtractSelectedRows() has a bug and does not
> respect the inverse flag.
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109
>
>
>
> On Thu, Feb 3, 2011 at 11:13 AM, William McLendon <wcmclen at sandia.gov>
> wrote:
> > Anyone else seeing this?  I'm trying to filter out edges in a table that
> are
> > really close or equal to zero using code like this:
> >>
> >>    # filter out rows that have 0 area.
> >>    areaRowSelection = vtkSelectionSource()
> >>    areaRowSelection.SetContentType(vtkSelectionNode.THRESHOLDS)
> >>    areaRowSelection.SetFieldType(vtkSelectionNode.ROW)
> >>    areaRowSelection.SetInverse(1)   # selection should exclude these
> rows
> >>    areaRowSelection.SetArrayName('area')
> >>    areaRowSelection.AddThreshold(-1E-15, 1E-15)  # non-matches=0,
> >> matches=1
> >>
> >>    filteredTable = vtkExtractSelectedRows()
> >>    filteredTable.SetInputConnection(0, vert_source_csv.GetOutputPort() )
> >>    filteredTable.SetInputConnection(1, areaRowSelection.GetOutputPort()
> )
> >>    filteredTable.Update()
> >
> > If I understand the selectionsource filter properly, then adding
> > SetInverse(1) should have the threshold filter select rows that are not
> in
> > the threshold range, right?  But this is the result I'm getting:
> >>
> >> +-------------+-------------+-------------+-------------+
> >> | area        | boundary are| centroid x  | centroid y  |
> >> +-------------+-------------+-------------+-------------+
> >> | 0           | 0           | -72.8572    | 41.2743     |
> >> | 0           | 0           | -73.8846    | 33.2743     |
> >> | 0           | 0           | -71.8381    | 36.2743     |
> >> | 0           | 0           | -72.8288    | 31.2743     |
> >
> > Am I missing something?  I'm going from the doxygen api at:
> >
> >
> http://www.vtk.org/doc/nightly/html/classvtkSelectionSource.html#accd91cdb84f1c13c020a736d521f2686
> >
> > Thanks!
> >  -William
> >
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-- 
Jeff Baumes, Ph.D.
Technical Lead, Kitware Inc.
(518) 881-4932
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