[vtkusers] vtkDataSetSurfaceFilter does not work properly on quadratic tet meshes

[Bryn Lloyd]

You can always "preserve" the cell/point ids as in 
vtkDataSetSurfaceFilter by first passing the data through the vtkIdFilter.

/Bryn


Dominik Szczerba wrote:
> Many thanks for a quick reply!
> Is there a way to preserve the original point and cell Ids like in the 
> vtkDataSetSurfaceFilter?
> Dominik
> 
> Francois Bertel pisze:
>> Hello,
>>
>> The output of a vtkDataSetSurfaceFilter is a vtkPolyData. vtkPolyData
>> can only have linear 0-D,1-D,2-D linear cells.
>>
>> The only kind of dataset that can host a quadratic cells is a
>> vtkUnstructuredGrid.
>>
>> Use vtkUnstructuredGridGeometryFilter to extract the surface of a
>> vtkUnstructuredGrid will preserving the quadratic property of the
>> cell. The output of this filter is a  vtkUnstructuredGrid.
>>
>> Regards.
>>
>> On Sun, Oct 11, 2009 at 8:18 PM, Dominik Szczerba 
>> <dominik at itis.ethz.ch> wrote:
>>> Hi,
>>>
>>> Is there any reason vtkDataSetSurfaceFilter returns a linear triangle 
>>> mesh
>>> from a quadratic tet mesh (by just breaking each quadratic element into
>>> several linear ones)? Is there a way in VTK to make the surface also
>>> quadratic?
>>>
>>> thanks,
>>> Dominik
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> 
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-- 
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Bryn Lloyd
Computer Vision Laboratory
ETH Zürich, Sternwartstrasse 7, ETF C110
CH - 8092 Zürich, Switzerland
Tel: +41 44 63 26668
Fax: +41 44 63 21199
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