#include <CGAL/Nef_polyhedron_3.h>
Definition
class CGAL::Nef_polyhedron_3< NefPolyhedronTraits_3 >::SHalfloop
A shalfloop is a great circle on a sphere map.
Figure figureNef3HalfloopIncidences depicts the relationship between a shalfloop and its incident shalfloops, and sfaces on a sphere map. A shalfloop is an oriented sloop. It is always paired with a shalfloop whose supporting Sphere_circle is pointing in the opposite direction. The twin() member function returns this shalfloop of opposite orientation.
A sphere map having a shalfloop models the neighborhood of a vertex which is isolated on a facet. That facet is returned by the member function facet.
Creation
There is no need for a user to create a SHalfloop explicitly. The class Nef_polyhedron_3<Traits> manages the needed shalfloops internally.
Types | |
The following types are the same as in Nef_polyhedron_3<Traits>. | |
| typedef unspecified_type | Mark |
| type of mark. | |
| typedef unspecified_type | Sphere_circle |
| sphere circle type stored in SHalfloop. | |
| typedef unspecified_type | Halffacet_const_handle |
| const handle to Halffacet. | |
| typedef unspecified_type | SHalfloop_const_handle |
| const handle to SHalfloop. | |
| typedef unspecified_type | SFace_const_handle |
| const handle to SFace. | |
Operations | |
| const Mark & | mark () const |
| the mark of se . | |
| const Sphere_circle & | circle () const |
| the sphere circle of se . | |
| SHalfloop_const_handle | twin () const |
| the twin of se . | |
| Halffacet_const_handle | facet () const |
| the facet that corresponds to se in the 3D incidence structure. | |
| SFace_const_handle | incident_sface () const |
| the incident sface of se . | |
