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# Chapter 12
Planar Nef Polyhedra

Michael Seel

Planar Nef Polyhedra are whatever one can construct with a finite number of Boolean operations on halfspaces. See the user manual pages for a detailed introduction.

### Concepts

ExtendedKernelTraits_2

### Classes

CGAL::Extended_cartesian<FT>
CGAL::Extended_homogeneous<RT>
CGAL::Filtered_extended_homogeneous<RT>
CGAL::Nef_polyhedron_2<T>
CGAL::Explorer
CGAL::Topological_explorer

### Alphabetical List of Reference Pages

- Nef_polyhedron_2<T>

- Topological_explorer

- Explorer

- ExtendedKernelTraits_2

- Extended_cartesian<FT>

- Extended_homogeneous<RT>

- Filtered_extended_homogeneous<RT>

Next chapter: Nef Polyhedra embedded on the Sphere

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The CGAL Project . Tue, December 21, 2004 .