So I have a need to extract the 2d manifold surface from a 3d mesh for 
postprocessing...  BoundaryInfo will do that just fine.

However, for efficiency it would be nice for these 2d surface elements to know 
the 3d element that created them.  To make that happen, I have been considering 
abusing the notion of parent - basically using the -parent pointer to store the 
(dim+1)-dimensional parent, and then making the parent() member return NULL if 
(a) the ptr is NULL as is done now, or (b) the parent and child are of 
different dimensions.

All that is needed is some other method to get access to the 
not-so-conventional parent. Elem::super_dimensional_parent()?

Thoughts?

-Ben




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