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Facet of a Polyhedral Surface

Definition

A facet optionally stores a normal vector, a plane, and a reference to an incident halfedge that points to the facet. If a plane is supported the normal is taken from the plane equation. The type tags as defined in CGAL_Polyhedron_3 indicates whether these member functions are supported, see Section reference arrow. Figure  reference arrow depicts the relationship between a halfedge and its incident halfedges, vertices, and facets.

Types

Facet defines the same types as CGAL_Polyhedron_3 except the traits class.

Access Functions

Halfedge_handle f.halfedge () an incident halfedge pointing to f.
Normal& f.normal () the normal vector. If a plane equation is supported, only a value of the normal vector is returned (no reference).
Plane& f.plane () the supporting plane of the facet.
Halfedge_around_facet_circulator
f.facet_begin () circulator of halfedges around the facet (counterclockwise).

Next: Class declaration of Polyhedron_traits
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The CGAL Project. 22 January, 1999.