[Dune] boundaryIndex on coarse grid

[Andreas Dedner]

 From the view of the GridFactories I thoght that a boundary segment
can only have one element? Or in other words to each boundary segment
there is a unique interior level 0 codimension 0 entity which returns
this boundary segment as intersection. At least in ALU or Alberta 
calling insertBoundarySegment with something that spans more than one
Entity<0> would lead to an error.
Andreas

Christian Engwer wrote:
> 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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