Definition

The concept AABBPrimitive describes the requirements for the primitives stored in the AABB tree data structure. The concept encapsulates a type for the input datum (a geometric object) and an identifier (id) type through which those primitives are referred to. The concept AABBPrimitive also refines the concepts DefaultConstructible and Assignable.

See also: CGAL::AABB_tree<AABBTraits>; AABBPrimitiveWithSharedData

Example

The Primitive type can be, e.g., a wrapper around a Handle. Assume for instance that the input objects are the triangle faces of a mesh stored as a CGAL::Polyhedron_3. The Datum would be a Triangle_3 and the Id would be a polyhedron Face_handle. Method datum() can return either a Triangle_3 constructed on the fly from the face handle or a Triangle_3 stored internally. This provides a way for the user to trade memory for efficiency.

Has Models:

CGAL::AABB_primitive<Id,ObjectPropertyMap,PointPropertyMap,Tag_false,CacheDatum>

CGAL::AABB_segment_primitive<Iterator,CacheDatum>

CGAL::AABB_triangle_primitive<Iterator,CacheDatum>

CGAL::AABB_halfedge_graph_segment_primitive<HalfedgeGraph,VertexPointPMap,Tag_false,CacheDatum>

CGAL::AABB_face_graph_triangle_primitive<FaceGraph,VertexPointPMap,Tag_false,CacheDatum>

Types
typedef unspecified_type	Point
	3D point type.

typedef unspecified_type	Datum
	Type of input datum.

typedef unspecified_type	Point_reference
	Point reference type returned by the function `point()`.

typedef unspecified_type	Datum_reference
	Datum reference type returned by the function `datum()`.

typedef unspecified_type	Id
	Type of identifiers through which the input objects are referred to.

Operations
Datum_reference	datum ()
	returns the datum (geometric object) represented by the primitive.

Id	id ()
	returns the corresponding identifier.

Point_reference	reference_point ()
	returns a 3D point located on the geometric object represented by the primitive.

Member Typedef Documentation

◆ Datum_reference

typedef unspecified_type AABBPrimitive::Datum_reference

Datum reference type returned by the function datum().

It is convertible to the type Datum.

◆ Id

typedef unspecified_type AABBPrimitive::Id

Type of identifiers through which the input objects are referred to.

It must be a model of the concepts DefaultConstructible and Assignable.

◆ Point_reference

typedef unspecified_type AABBPrimitive::Point_reference

Point reference type returned by the function point().

It is convertible to the type Point.

Member Function Documentation

◆ id()

Id AABBPrimitive::id ( )

returns the corresponding identifier.

This identifier is only used as a reference for the objects in the output of the AABB_tree methods.

◆ reference_point()

Point_reference AABBPrimitive::reference_point ( )

returns a 3D point located on the geometric object represented by the primitive.

This function is used to sort the primitives during the AABB tree construction as well as to construct the search KD-tree internal to the AABB tree used to accelerate distance queries.