mirror of https://github.com/CGAL/cgal
41 lines
1.7 KiB
C++
41 lines
1.7 KiB
C++
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#include <CGAL/Simple_cartesian.h>
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#include <CGAL/Polyhedron_3.h>
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#include <iostream>
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template <class Poly>
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typename Poly::Halfedge_handle make_cube_3( Poly& P) {
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// appends a cube of size [0,1]^3 to the polyhedron P.
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CGAL_precondition( P.is_valid());
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typedef typename Poly::Point_3 Point;
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typedef typename Poly::Halfedge_handle Halfedge_handle;
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Halfedge_handle h = P.make_tetrahedron( Point( 1, 0, 0),
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Point( 0, 0, 1),
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Point( 0, 0, 0),
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Point( 0, 1, 0));
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Halfedge_handle g = h->next()->opposite()->next(); // Fig. (a)
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P.split_edge( h->next());
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P.split_edge( g->next());
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P.split_edge( g); // Fig. (b)
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h->next()->vertex()->point() = Point( 1, 0, 1);
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g->next()->vertex()->point() = Point( 0, 1, 1);
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g->opposite()->vertex()->point() = Point( 1, 1, 0); // Fig. (c)
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Halfedge_handle f = P.split_facet( g->next(),
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g->next()->next()->next()); // Fig. (d)
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Halfedge_handle e = P.split_edge( f);
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e->vertex()->point() = Point( 1, 1, 1); // Fig. (e)
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P.split_facet( e, f->next()->next()); // Fig. (f)
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CGAL_postcondition( P.is_valid());
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return h;
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}
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typedef CGAL::Simple_cartesian<double> Kernel;
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typedef CGAL::Polyhedron_3<Kernel> Polyhedron;
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typedef Polyhedron::Halfedge_handle Halfedge_handle;
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int main() {
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Polyhedron P;
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Halfedge_handle h = make_cube_3( P);
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return (P.is_tetrahedron(h) ? 1 : 0);
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}
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