CGAL 6.1.1 - 2D and 3D Linear Geometry Kernel

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Functions
CGAL::approximate_dihedral_angle()
Reference Manual » Global Kernel Functions

##

## Functions
template<typename Kernel >
Kernel::FT | CGAL::approximate_dihedral_angle (const CGAL::Point_3< Kernel > &p, const CGAL::Point_3< Kernel > &q, const CGAL::Point_3< Kernel > &r, const CGAL::Point_3< Kernel > &s)
| returns an approximation of the signed dihedral angle in the tetrahedron `pqrs` of edge `pq`.

## Function Documentation

## ◆ approximate_dihedral_angle()

template<typename Kernel >

Kernel::FT CGAL::approximate_dihedral_angle | ( | const CGAL::Point_3< Kernel > & | p,
|  | const CGAL::Point_3< Kernel > & | q,
|  | const CGAL::Point_3< Kernel > & | r,
|  | const CGAL::Point_3< Kernel > & | s
| ) |  |

`#include <CGAL/Kernel/global_functions.h>`

returns an approximation of the signed dihedral angle in the tetrahedron `pqrs` of edge `pq`.

The sign is negative if `orientation(p,q,r,s)` is `CGAL::NEGATIVE` and positive otherwise. The angle is given in degrees.

Precondition
  `p,q,r` and `p,q,s` are not collinear.