[Dune] problems with subsampling in vtk writer

[Arya Fallahi]

Dear Duners,

I got to have problems with subsampling version of vtk writer in dune since
one week, I searched a lot in the website and tutorials but I could not
solve it on my own. I will be more than thankful if someone shares with me
a code that works with subsampling.

The problem is that although I increase the subsampling level the returned
vtk files are all the same. I am using tetrahedral meshes with high order
expansions, that's why I definitely need the subsampling functions.

The code very briefly is as follows:

std::string vtkreturnstring("");
Dune::SubsamplingVTKWriter<GridView>
vtkWriterSubsampling(grid_.leafView(),subsamplinglevel,true);
vtkWriterSubsampling.addCellData(new VTKFunctionDGTD<Grid>  (grid_, en_,
"electric-field") );
vtkreturnstring = vtkWriterSubsampling.pwrite(filename.c_str(),
path.c_str(), "", Dune::VTK::appendedraw);

Do you think there is anything stupid I am doing here. I will really
appreciate if someone shares with me a sample code that works with
subsampling.

Best regards,
Arya
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