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[johnzjq <>]

Hi all,

I am trying to invert the normals of facets in a polyhedron_3. 

A fast way is to modify the connections of halfedges inside each facet.
However, I found functions such as set_next() and set_prev() are private
members of class I_Polyhedron_halfedge. How to use these functions? or are
there exist some alternate operations?

Another way is to reconstruct a new polyhedron, which is clumsy solution I
think.

Your help would be appreciated!

John.Z

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