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[mparusinski <>]

Hi, 

I am writing some code to perform finite element analysis and I need to
extract the orientations of each facet after performing a 3d triangulation.
To check if the code performs correctly I am performing a 3d triangulation
on a very simple 3d image which consists of 1 only. Overall I get really
good results. However a few cell seems to be inconsistently oriented, some
are due to slivers. However I manage to deal with them seperately. But I
still get cells inconsistently oriented for non-slivery cells. They seem to
mostly occur on the edges. Is it possible to get cells which corresponds to
no material (or corresponding to void) i.e. with no subdomain index?

Michal Parusinski
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