[vtkusers] ExtractSelectedThresholds

[David E DeMarle]

Try thresh->SetName("SelectedPoints")

David E DeMarle
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x109



On Tue, Apr 27, 2010 at 8:15 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Tue, Apr 27, 2010 at 7:45 PM, David E DeMarle
> <dave.demarle at kitware.com> wrote:
>> Yep, you need to tell the SelectionNode that its contents describe a
>> set of thresholds, since otherwise they might represent a set of ids,
>> locations etc.
>>
>> That flag is used as a sanity check in the Extraction filters and more
>> to the point by the vtkExtractSelection filter, which uses it to
>> decide which of the real ExtractionFilters it needs to call into for
>> any given SelectionNode. That is why you don't see
>> vtkExtractSelectedThresholds instantiated by name in that test.
>
>
> Almost there...
>
> I did what you said:
> selectionNode->SetContentType(vtkSelectionNode::THRESHOLDS);
>
> I also added:
> selectionNode->SetSelectionData(selectEnclosedPoints->GetOutput()->GetPointData());
>
> But now the error is:
> vtkExtractSelectedThresholds (0x8de7b88): Could not figure out what
> array to threshold in.
>
> I think we really need an updated version of a tutorial on "How
> selections work", these things seem quite confusing.
>
> Thanks,
>
> David
>