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## CGAL::orientation

Orientation |
orientation ( | Point_2<Kernel> p, Point_2<Kernel> q, Point_2<Kernel> r)
|  | returns LEFT_TURN, if r lies to the left of the oriented line l defined by p and q, returns RIGHT_TURN if r lies to the right of l, and returns COLLINEAR if r lies on l.
Orientation |
orientation ( | Point_3<Kernel> p, Point_3<Kernel> q, Point_3<Kernel> r, Point_3<Kernel> s)
|  | returns POSITIVE, if s lies on the positive side of the oriented plane h defined by p, q, and r, returns NEGATIVE if s lies on the negative side of h, and returns COPLANAR if s lies on h.

### See Also

CGAL::collinear CGAL::left_turn CGAL::right_turn

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The CGAL Project . Tue, December 21, 2004 .