[Dune] Projection direction in dune-grid-glue with psurface

[Miguel de Benito Delgado]

Hi,

  during traversal of the glued intersections I'd like to have access to
the direction field along which the domain grid was projected onto the
target grid. From the paper I understood libpsurface should use the outer
normal by default, so in my case what I want is unitOuterNormal(), but this
is not implemented for the glued intersections.

 I've been looking for it but I cannot find the method I need in the docs.
Does anybody know?

Thanks,
--
Miguel de  Benito.
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