CGAL 6.2 - 3D Boolean Operations on Nef Polyhedra: CGAL::Nef_nary_union_3< NefPolyhedron_3 > Class Template Reference

CGAL 6.2 - 3D Boolean Operations on Nef Polyhedra

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CGAL::Nef_nary_union_3< NefPolyhedron_3 > Class Template Reference
Reference Manual

`#include <CGAL/Nef_nary_union_3.h>`

## Definition

template<typename NefPolyhedron_3>
class CGAL::Nef_nary_union_3< NefPolyhedron_3 >

This class helps to perform the union of a set of 3D Nef polyhedra efficiently.

It succesively applies the binary union operation of `Nef_polyhedron_3`, but schedules these union operations in an opportune way. The class is most efficient, if the polyhedra are added in sorted order. Any order that reflects proximity in the three-dimensional space is helpful. To allow saving memory space, the sorting is left to the user. This way the user can generate the polyhedra in a sorted way and add them one by one to `Nef_nary_union_3`.

Template Parameters

  NefPolyhedron_3 | must be an instantiation of the class template `Nef_polyhedron_3`.

## Creation
| Nef_nary_union_3 ()
| initialization only.

## Member Functions
NefPolyhedron_3 | get_union () const
| returns the union of the polyhedra previously added to the class.
void | add_polyhedron (const NefPolyhedron_3 &N)
| adds a polyhedron.

## Member Function Documentation

## ◆ get_union()

template<typename NefPolyhedron_3 >

NefPolyhedron_3 CGAL::Nef_nary_union_3< NefPolyhedron_3 >::get_union | ( |  | ) | const

returns the union of the polyhedra previously added to the class.

The union does not get removed so that further Nef polyhedra can be added later.