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add function to close boundary cycle of size 2 

use it after the general stitching function
This commit is contained in:
Sébastien Loriot 2017-10-12 14:38:41 +02:00
parent a2cc276ccb
commit 01bda3f852
1 changed files with 40 additions and 0 deletions
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40
Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/stitch_borders.h
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@ -413,6 +413,45 @@ void stitch_borders_impl(PM& pmesh,
run_stitch_borders(pmesh, to_stitch, uf_vertices, uf_handles); run_stitch_borders(pmesh, to_stitch, uf_vertices, uf_handles);
} }
template <class PM>
void stitch_boundary_cycle_2(PM& pmesh)
{
typedef typename boost::graph_traits<PM>::halfedge_descriptor halfedge_descriptor;
std::vector<halfedge_descriptor> cycles;
BOOST_FOREACH(halfedge_descriptor hd, halfedges(pmesh))
{
if ( is_border(hd, pmesh) )
{
if ( hd < next(hd, pmesh) && next(next(hd, pmesh), pmesh) == hd )
{
cycles.push_back(hd);
}
}
}
BOOST_FOREACH(halfedge_descriptor hd, cycles)
{
halfedge_descriptor nhd = next(hd, pmesh);
//nhd and its opposite will be removed
//update face pointer
set_face(hd, face(opposite(nhd, pmesh), pmesh), pmesh);
set_halfedge(face(hd, pmesh), hd, pmesh);
//update next/prev pointers
halfedge_descriptor tmp = prev(opposite(nhd, pmesh), pmesh);
set_next(tmp, hd, pmesh);
tmp = next(opposite(nhd, pmesh), pmesh);
set_next(hd, tmp, pmesh);
//update vertex pointers
set_halfedge(source(hd, pmesh), opposite(hd, pmesh), pmesh);
set_halfedge(target(hd, pmesh), hd, pmesh);
// remove the extra halfedges
remove_edge(edge(nhd, pmesh), pmesh);
}
}
} //end of namespace internal } //end of namespace internal
@ -484,6 +523,7 @@ void stitch_borders(PolygonMesh& pmesh, const CGAL_PMP_NP_CLASS& np)
internal::Less_for_halfedge<PolygonMesh, VPMap>(pmesh, vpm), vpm); internal::Less_for_halfedge<PolygonMesh, VPMap>(pmesh, vpm), vpm);
stitch_borders(pmesh, hedge_pairs_to_stitch); stitch_borders(pmesh, hedge_pairs_to_stitch);
internal::stitch_boundary_cycle_2(pmesh);
} }