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Merge pull request #2688 from lrineau/Convex_hull_3-fix_quickhull_in_coplanar_case-GF 

Fix Convex_hull_3 quickhull, with coplanar point
This commit is contained in:
Laurent Rineau 2017-12-19 16:17:29 +01:00
parent 0ad70e2dd4 22d5a5b884
commit c4a7adcd5b
2 changed files with 33 additions and 2 deletions
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17
Convex_hull_3/include/CGAL/convex_hull_3.h
View File

@ -315,13 +315,26 @@ void coplanar_3_hull(InputIterator first, InputIterator beyond,
typename boost::property_map<Polyhedron_3, CGAL::vertex_point_t>::type vpm
= get(CGAL::vertex_point, P);
std::vector<typename boost::graph_traits<Polyhedron_3>::vertex_descriptor> vertices;
typedef boost::graph_traits<Polyhedron_3> Graph_traits;
typedef typename Graph_traits::vertex_descriptor vertex_descriptor;
typedef typename Graph_traits::halfedge_descriptor halfedge_descriptor;
typedef typename Graph_traits::face_descriptor face_descriptor;
std::vector<vertex_descriptor> vertices;
vertices.reserve(CH_2.size());
BOOST_FOREACH(const Point_3& p, CH_2){
vertices.push_back(add_vertex(P));
put(vpm, vertices.back(),p);
}
Euler::add_face(vertices, P);
face_descriptor f = Euler::add_face(vertices, P);
// Then triangulate that face
const halfedge_descriptor he = halfedge(f, P);
halfedge_descriptor other_he = next(next(he, P), P);
for(std::size_t i = 3, end = vertices.size(); i < end; ++i) {
const halfedge_descriptor next_he = next(other_he, P);
Euler::split_face(other_he, he, P);
other_he = next_he;
}
}

18
Convex_hull_3/test/Convex_hull_3/quickhull_test_3.cpp
View File

@ -106,6 +106,22 @@ void test_small_hull()
polyhedron2.size_of_facets() == 6 );
}
void test_coplanar_hull()
{
std::vector<Point_3> points;
points.push_back(Point_3(0,0,0));
points.push_back(Point_3(1,0,0));
points.push_back(Point_3(0,1,0));
points.push_back(Point_3(1,1,0));
points.push_back(Point_3(1.5,0.5,0));
points.push_back(Point_3(0.5,1.1,0));
Polyhedron_3 polyhedron;
CGAL::convex_hull_3(points.begin(), points.end(), polyhedron, Traits());
assert( polyhedron.is_valid() );
assert( polyhedron.size_of_facets() == 4 );
assert( polyhedron.is_pure_triangle() );
}
int main()
{
@ -115,6 +131,8 @@ int main()
test_tetrahedron_convexity();
std::cerr << "Testing small hull" << std::endl;
test_small_hull();
std::cerr << "Testing coplanar hull" << std::endl;
test_coplanar_hull();
std::cerr << "Testing 500 random points" << std::endl;
std::vector<Point_3> points;