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

[Francois Bertel]

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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