[dune-pdelab] Very large .vtu files

[conf86 at web.de]

Thank you for your fast answer.

> Are you using ascii-mode to write the files (the default)?  Use appendedraw
> instead, see
> https://www.dune-project.org/doc/doxygen/html/dune-grid_2dune_2grid_2io_2file_2vtk_2common_8hh.html

I use a modification of the course examples and it seems they already use appendedraw:

 Dune::SubsamplingVTKWriter<GV> vtkwriter(gv,3);
 Dune::PDELab::addSolutionToVTKWriter(vtkwriter,gfs,unew);
 vtkwriter.write(fn.getName(),Dune::VTK::appendedraw);
 fn.increment();

Best regards