[Insight-developers] itk::Mesh questions.

[Mark Foskey]

I'm sorry, I shouldn't have used the term "neighbors of a vertex". 
Given a cell C (not necessarily a vertex), I want a list of the cells 
for which C is a boundary element.  Shouldn't there be a way to get 
that?  If you can express C as a particular boundary element of some 
other cell D, then you can call GetCellBoundaryFeatureNeighbors().  But 
that seems awkward.

Luis Ibanez wrote:
> Hi Mark,
> 
> I'm affraid there is not a notion of neigborhood vertices (points) in
> the Mesh. Since this relationship implicitly commes from the fact of
> two vertices being the nodes of a LineCell.
> 
> In practical cases in the past I have added (as you mention) VertexCells
> to the nodes in order for these VertexCells to hold the connectivity
> information. It is not much of an overhead and results in a consistent
> topology.
> 
> You may want to take a look at the Morphogenesis example. Where
> biological cells are simulated in every mesh node, and VertexCells
> are used to hold the topology.
> 
> 
> Luis
> 
> 
> ------------------------------------
> 
> 
> Mark Foskey wrote:
> 
>> In a mesh, what is the idiom for finding the neighbors of a Vertex?  I 
>> see GetCellBoundaryFeatureNeighbors(), which one might think would 
>> work if Vertex cells had a single degenerate boundary feature, but 
>> they don't.
>>
>> Also, if you have indicate the connectively manually using 
>> SetBoundaryAssignment(), do you still need to call BuildCellLinks() 
>> for the neighbors to be determined?  It's not obvious from the docs 
>> either way.
>>
> 
> 
> 


-- 
Mark Foskey    (919) 843-5436  Computer-Aided Diagnosis and Display Lab
mark_foskey@unc.edu            Department of Radiology, CB 7515, UNC
http://www.cs.unc.edu/~foskey  Chapel Hill, NC  27599-7515