[vtkusers] vtkPolyData to a vtkUnstructuredGrid

[David E DeMarle]

Cool, glad you got it sorted out.


David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Tue, Jul 15, 2014 at 7:47 PM, Allen Sanderson <allen at sci.utah.edu> wrote:

> Hi Dave,
>
> Thanks for the reply. I dug into the issue a bit more and found the
> conversion was working fine but a later operation seemed to not return any
> cell points thus I was thinking the conversion was not working. I just did
> some more digging and found the issue. In a nut shell an assumption was
> made that the unstructured grid would contain only polygonal cells (tris,
> hex, tets, etc) thus a max of eight vertices. A polyline does not fit that
> assumption. Thus memory got stomped on but did not cause a seg fault.  Thus
> the classic chasing ones tail was the issue. So no bug but some bad code on
> our part.
>
>  Cheers,
>
>
> Allen
>
>
>
> Allen Sanderson
>
> SCI Institute
>
> University of Utah
>
> www.sci.utah.edu
>
>
>
> On Jul 15, 2014, at 8:20 AM, David E DeMarle <dave.demarle at kitware.com>
> wrote:
>
> Hey Allen!
>
> Probably a bug in the append filter, it must not be converting with
> polylines type cells correctly for some reason.
>
> As Burlen said it would help if you could post a small example data set.
> That will make it trivial to replicate the problem and fix it.
>
> Otherwise, try using a different filter to do the conversion (as a side
> effect, like append does). Threshold is my habitual choice for * to
> unstructured conversion.
>
>
>
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
>
> On Fri, Jul 11, 2014 at 6:08 PM, Burlen Loring <burlen.loring at gmail.com>
> wrote:
>
>>  It would help if you post an example with some data so that we can see
>> exactly what you're doing.
>>
>>
>> On 07/11/2014 01:29 PM, Allen Sanderson wrote:
>>
>>
>>  Hello,
>>
>>  I have a vtkPolyData structure that contains vtkPolyLines or vertex(s).
>> In the course of the coding the vtkPolyData needs to be converted to a
>> vtkUnstructuredGrid. I have used the example here using the append filter:
>>
>>
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/PolyDataToUnstructuredGrid
>>
>>  However, no lines come across only points. I have also iterated through
>> each cell and moved the point id list over with the same results, no lines
>>
>>  As such, I am wondering why lines might not be moved over.
>>
>>  Cheers,
>>
>>  Allen
>>
>>
>>  Allen Sanderson
>> SCI Institute
>> University of Utah
>> www.sci.utah.edu
>>
>>
>>
>>
>>
>>
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> Visit other Kitware open-source projects at
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> _______________________________________________
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>
> Visit other Kitware open-source projects at
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>
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