[vtk-developers] Extracting cells based on type

[David E DeMarle]

I've used this python programmable filter in paraview before which simply copies
each cell's type to a new cell associated integer array.

od = self.GetOutput()
od.ShallowCopy(self.GetInput())
cta = vtk.vtkIntArray()
cta.SetName("cell types")
cta.SetNumberOfComponents(1)
cta.SetNumberOfTuples(od.GetNumberOfCells())
od.GetCellData().AddArray(cta)
for x in xrange(0,od.GetNumberOfCells()):
  cta.SetValue(x,od.GetCell(x).GetCellType())

After that use either threshold to extract one contiguous range of
cell types, or selection by thresholds to extract any number of
ranges.

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


On Tue, Oct 2, 2012 at 10:05 AM, Andy Bauer <andy.bauer at kitware.com> wrote:
> When I've tried to do this in ParaView I've used the Mesh Quality filter
> along with the Threshold filter. I've had somewhat limited success with that
> though.
>
>
> On Tue, Oct 2, 2012 at 10:03 AM, Robert Michael O'Bara
> <bob.obara at kitware.com> wrote:
>>
>> Hi All,
>>
>> Does anyone know if there is a filter that can extract cells based on cell
>> type?  I have an unstructured grid that is composed of both surface and
>> volumetric cells and I have a writer that assumes that the mesh consists of
>> only volumetric cells.
>>
>> Thanks in advance for your time and help!
>>
>> Bob
>>
>> Robert M. O'Bara, MEng.
>> Technical Leader
>>
>> Kitware Inc.
>> 28 Corporate Drive
>> Suite 101
>> Clifton Park, NY 12065
>>
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