CGAL 6.1.1 - 2D and 3D Linear Geometry Kernel

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Kernel::ComputeApproximateDihedralAngle_3 Concept Reference
Reference Manual » Concepts » Kernel Function Object Concepts

## Definition

Refines
  `AdaptableFunctor`

## Operations
A model of this concept must provide:
Kernel::FT | operator() (const Kernel::Point_3 &p, const Kernel::Point_3 &q, const Kernel::Point_3 &r, const Kernel::Point_3 &s) const
| returns an approximation of the signed dihedral angle in the tetrahedron `pqrs` of edge `pq`.

## Member Function Documentation

## ◆ operator()()

Kernel::FT Kernel::ComputeApproximateDihedralAngle_3::operator() | ( | const Kernel::Point_3 & | p,
|  | const Kernel::Point_3 & | q,
|  | const Kernel::Point_3 & | r,
|  | const Kernel::Point_3 & | s
| ) |  | const

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.