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[johnzjq <>]

Dear all,

I am using Nef_polyhedron with Exact_predicates_exact_constructions_kernel.
The following assertion was triggered when I was trying to convert a closed
polyhedron to Nef_polyhedron:

Error !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Error !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
CGAL error: assertion violation!
Expression : pre_prev->is_border() ||
!pe_prev->facet()->plane().is_degenerate()
File           : c:\program files
(x86)\cgal-3.7\include\cgal\nef_3\polyhedron_3_to_nef_3.h
Line          :219

The polyhedron is a model produced by MinkowskiSum and was regularized.

Any ideas? 

With kind regards,

John
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