mirror of https://github.com/CGAL/cgal
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
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#include <CGAL/point_generators_3.h>
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#include <CGAL/algorithm.h>
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#include <CGAL/Polyhedron_3.h>
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#include <CGAL/convex_hull_3.h>
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#include <vector>
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typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
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typedef CGAL::Polyhedron_3<K> Polyhedron_3;
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typedef K::Segment_3 Segment_3;
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// define point creator
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typedef K::Point_3 Point_3;
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typedef CGAL::Creator_uniform_3<double, Point_3> PointCreator;
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//a functor computing the plane containing a triangular facet
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struct Plane_from_facet {
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Polyhedron_3::Plane_3 operator()(Polyhedron_3::Facet& f) {
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Polyhedron_3::Halfedge_handle h = f.halfedge();
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return Polyhedron_3::Plane_3( h->vertex()->point(),
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h->next()->vertex()->point(),
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h->opposite()->vertex()->point());
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}
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};
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int main()
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{
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CGAL::Random_points_in_sphere_3<Point_3, PointCreator> gen(100.0);
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// generate 250 points randomly on a sphere of radius 100.0
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// and copy them to a vector
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std::vector<Point_3> points;
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CGAL::cpp0x::copy_n( gen, 250, std::back_inserter(points) );
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// define polyhedron to hold convex hull
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Polyhedron_3 poly;
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// compute convex hull of non-collinear points
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CGAL::convex_hull_3(points.begin(), points.end(), poly);
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std::cout << "The convex hull contains " << poly.size_of_vertices() << " vertices" << std::endl;
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// assign a plane equation to each polyhedron facet using functor Plane_from_facet
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std::transform( poly.facets_begin(), poly.facets_end(), poly.planes_begin(),Plane_from_facet());
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return 0;
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}
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