[Dune] do intersections need to match?

[Aleksejs Fomins]

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Dear Dune,

When a geometry of a face is requested as an intersection from two neighbouring elements, does the orientation of this face have to match? If yes, how is this orientation usually established in present grids.

So far I was naively using ReferenceElement.subEntity(...) to find the indices of a face from the containing element, but, naturally, there is nothing to enforce that the faces generated this way would have the same orientation...

Regards,
Aleksejs
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