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 Polyhedron_3 indicates whether these member functions are supported, see Section . Figure  depicts the relationship between a halfedge and its incident halfedges, vertices, and facets.

Types

Facet defines the same types as 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).