[Dune] vtkwriter for cell data on mixed grids

[Nicolas Schwenck]

Dear Dune,

Using a mixed grid in 2d (triangles and quadrilaterals) I try to use the 
vtkwriter to write cell data as output. I am struggling with the 
ordering of the vector I give to the vtkwriter.

The vtkwriter documentation says: "The value of the grid function for an 
arbitrary element will be accessed by calling operator[] with the index 
(corresponding with the grid view) of the element." I do not understand 
what that means for a mixed grid, where the index is not unique for 
every element on the gridview (but only for every element of the same 
geometry type).

When I look into the implementation it seems to me that a standard 
gridview iterator is used, but unfortunately also if I fill my data 
vector with such an ordering the output is somehow mixed up.

Has anyone used the vtkwriter for mixed grids and cell data and can give 
me a hint where to look at? I use dune trunk.
Any help is appreciated,
Nicolas

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!!!! CMWR 2014: 9th - 13th June 2014 in Stuttgart !!!!
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Dipl.-Ing. Nicolas Schwenck
                
University of Stuttgart
Department of Hydromechanics and Modelling of Hydrosystems

Pfaffenwaldring 61                           phone: +49 711 685 64736
GER-70569 Stuttgart                          fax:   +49 711 685 60430

             email: nicolas.schwenck at iws.uni-stuttgart.de
                 url: www.hydrosys.uni-stuttgart.de

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