CGAL 5.6.3 - 2D and 3D Linear Geometry Kernel

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Kernel::Orientation_3 Concept Reference
2D and 3D Linear Geometry Kernel Reference » Concepts » Kernel Function Object Concepts

## Definition

Refines
  `AdaptableQuaternaryFunction`

See also
  `CGAL::orientation()`

## Operations
A model of this concept must provide:
Orientation | operator() (const Kernel::Point_3 &p, const Kernel::Point_3 &q, const Kernel::Point_3 &r, const Kernel::Point_3 &s)
| returns CGAL::POSITIVE, if `s` lies on the positive side of the oriented plane `h` defined by `p`, `q`, and `r`, returns CGAL::NEGATIVE if `s` lies on the negative side of `h`, and returns CGAL::COPLANAR if `s` lies on `h`.
Orientation | operator() (const Kernel::Vector_3 &u, const Kernel::Vector_3 &v, const Kernel::Vector_3 &w)
| returns CGAL::POSITIVE if `u`, `v` and `w` are positively oriented, returns CGAL::NEGATIVE if `u`, `v` and `w` are negatively oriented, and returns CGAL::COPLANAR if `u`, `v` and `w` are coplanar.
Orientation | operator() (const Kernel::Sphere_3 &s)
| returns the orientation of the sphere `s`.