[Dune] [#834] Edge orientation in reference element/cell

[Dune]

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The following task has a new comment added:

FS#834 - Edge orientation in reference element/cell
User who did this - Andreas Dedner (dedner)

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This is not a requirement of the interface. In fact it is not possible
to guarantee this if you require the same property for the geometryInOutside.
This is a problem of twists and not yet directly covered by the interface
(their has been some discussion but no conclusion...)

If you use AluGrid then the intersection has two non interface methods
twistInInside and twistInOutside which return 0 or 1.
0 means that the geometry has the same orientation and 1 means that it is
flipped. 
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http://www.dune-project.org/flyspray/index.php?do=details&task_id=834#comment2243

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