RegularTriangulationCellBase_3 Concept Reference

Definition

The regular triangulation of a set of weighted points does not necessarily have one vertex for each of the input points. Some of the input weighted points have no cell in the dual power diagrams and therefore do not correspond to a vertex of the regular triangulation. Those weighted points are said to be hidden points. A point which is hidden at a given time may appear later as a vertex of the regular triangulation upon removal on some other weighted point. Therefore, hidden points have to be stored somewhere. The regular triangulation stores those hidden points in its cells.

A hidden point can appear as vertex of the triangulation only when the three dimensional cell where its point component is located (the cell which hides it) is removed. Therefore we decided to store in each cell of a regular triangulation the list of hidden points that are located in the face. Thus points hidden by a face are easily reinserted in the triangulation when the face is removed.

The base cell of a regular triangulation has to be a model of the concept RegularTriangulationCellBase_3, which refines the concept TriangulationCellBase_3 by adding in the cell a container to store hidden points and an operator to compute its weighted circumcenter.

Refines:

TriangulationCellBase_3

Has Models:

CGAL::Regular_triangulation_cell_base_3

See also

RegularTriangulationTraits_3

Types
typedef unspecified_type	Point
	Must be the same as the point type Weighted_point_3 defined by the geometric traits class of the triangulation.
typedef unspecified_type	Point_iterator
	Iterator of value type Point

Access Functions
Point_iterator	hidden_points_begin ()
	Returns an iterator pointing to the first hidden point.
Point_iterator	hidden_points_end ()
	Returns a past-the-end iterator.
const RegularTriangulationTraits_3::Point_3 &	weighted_circumcenter (const RegularTriangulationTraits_3 &gt=RegularTriangulationTraits_3()) const
	Returns the weighted circumcenter of the cell, with no weight. More...

Setting
void	hide_point (const Point &p)
	Adds p to the set of hidden points of the cell.

Member Function Documentation

weighted_circumcenter()

const RegularTriangulationTraits_3::Point_3& RegularTriangulationCellBase_3::weighted_circumcenter

(

const RegularTriangulationTraits_3 &

gt = RegularTriangulationTraits_3()

)

const

Returns the weighted circumcenter of the cell, with no weight.

RegularTriangulationTraits_3 is the geometric traits class of the triangulation. This operator is required only when the dual functions are called.