The builder fails with:

CGAL::Polyhedron_incremental_builder_3<HDS>::

add_vertex_to_facet(): input error: disconnected facet complexes at vertex

15:

involved facets are: 14 2 9 6 5 8 1 10 3 11 12 7 13 (closed

cycle) and.

I ran the test_facet, and it fails on the check:

//Test if all halfedges of the new face

//are possibly consecutive border halfedges in the HDS.

//Possibly because it may be not directly encoded in the HDS

//(using next() function ). This situation can occur when one or

//more facets share only a vertex: For example, the new facet we try to

add

//would make the vertex indices[i] a manifold but this should be

forbidden

//if a facet only incident to that vertex has already been inserted.

//We check this for each vertex of the sequence.

Can you explain please what this means or maybe provide a small example?

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