[Dune] Vector Data to VTK format?

[Christian Engwer]

Hi Andreas,

> in the VTKFunction interface the method ncomp returns the number of
> components. As far as I have understood it, this value is either
> 1: scalar
> 3: vector
> I think all values in between are not valid?

You are wrong, VTK can only handle scalar or dim=3 data, but the
VTKWriter does the padding. If some data is stored without padding,
this is a bug in the VTKWriter.

Christian

> So for 2d one still has to return 3 and the evaluate method with
> comp=2 should return 0.
> Andreas
> 
> Christian Engwer wrote:
> > Dear Arne,
> > 
> >> I am wondering if there is a possibility to export Vector data to  
> >> VTK-format in DUNE. I want to visualize the velocity field in  
> >> Paraview. Currently I take the norm of the velocity vector and saves  
> >> this to VTK-format, but I am not satisfied with this.
> > 
> > It depends a little bit on how you store your data. The VTKWriter can
> > write vertor valued data, but not necessarily all types of storage
> > containers. The VTKWriter stores either a simple container, which is
> > assumed to be scalar, or a VTKFunction, which can handle both scalar
> > and vector valued data. In all higherlevel modules suitable
> > VTKFunction exist to export the data, if you are using a different
> > container you have to write your own VTKFunction. THe interface is
> > very simple, have a look at 
> > http://www.dune-project.org/doc/doxygen/dune-grid-html/classDune_1_1VTKWriter_1_1VTKFunction.html
> > 
> > Hope that helps
> >   Christian
> > 
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