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Hi everyone, I now have a problem as follows:
I have two rings of vertices (halfedges) with different degrees (number of
edges), each ring can be seen as a hole, which means the halfedges on each 
ring
are border edges. Now i want to merge the two rings with some algorithm, how 
to
use the functions in  Polyhedron_3, for example split_edge,join_facet..., to
connect the vertices on the two rings one by one, in order to finish this task
please?

Actually, this problem can be explained as: how to do the "join_loop" 
operation
in Polyhedron_3 when the degrees of the two facets are different? I know the
rule of how to connect the vertices on the two rings gradually, and just don't
know how to do it through the functions provided in Polyhedron_3, since the 
two
rings are diconnected to each other at first.

Meanwhile, I just want to use the operations in Polyhedron_3 without 
rebuilding
the whole mesh using the "delegate " method or Nef_polyhedron.

Could you please help me? Thanks!