[Dune] intersection twist

[Marco Cisternino]

Hi Duners,
I need to compute the local parametrization of an element using 
transfinite interpolation.
In order to do that I need to retrieve the vertices of the neighbours on 
the face opposite to every intersection.
For structured grid this is not a big deal, but for unstructured grid I 
need to know not only the indexInOutside of the intersection but also if 
the intersection is rotated.
I know that the methods twistInSelf and twistInNeighbor for 
Alu3dGridIntersectionIterator can help, but I cannot understand how they 
work.
Could anyone explain how to figure out what the results of these methods 
mean, please?

Thanks a lot for any help.
Bests,
Marco

-- 
Marco Cisternino
Optimad Engineering s.r.l.
www.optimad.it
marco.cisternino at optimad.it
+3901119719782