[Dune] boundaryIndex on coarse grid

[Christian Engwer]

On Mon, Jan 18, 2010 at 09:59:24AM +0100, Andreas Dedner wrote:
> Hi,
> I thought that each level 0 boundary segment should have a unique
> index.
> Andreas

Yes, the segments should have a unique index, but it is not stated,
that you can only have one element per segment.

Christian

> 
> Christian Engwer wrote:
> > While updating the strcutured grids, I was wondering about a small
> > detail in the boundaryIndex interface.
> > 
> > The meeting minutes state:
> > 
> > The user must be able to attach boundary information to the level-0
> > boundaries.
> >    1. Up to now the boundaryIDs allowed to associate an int with a
> > 	  boundary segament.
> >    2. The new proposal is to have an index with a boundary index. This
> > 	  is (more) consistent with the other indicies and allows to
> > 	  associate more or less any data with boundaries. The number
> > 	  would be inherited from the coarse grid.
> > 
> > It does not say anything about the number of indices on the coarse
> > grid. I also thought, that that was the purpose of the
> > numBoundarySegments method.
> > 
> > These descriptions especillay allow to have a boundary segment that
> > covers several coarse grid element, like the whole left side on a
> > strcutures grid. The gridcheck on the other hand complains.
> > 
> > So my question now is.
> > 
> > * What is the desired feature. Do we allow "multielement"-segments?
> > 
> > Christian
> > 
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> 
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