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Orientation
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orientation ( Point_2<Kernel> p, Point_2<Kernel> q, Point_2<Kernel> r)
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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.
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Orientation
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orientation ( Vector_2<Kernel> u, Vector_2<Kernel> v)
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returns LEFT_TURN if u and v form a left turn,
returns RIGHT_TURN if u and v form a right turn,
and returns COLLINEAR if u and v are collinear.
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Orientation
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orientation ( Point_3<Kernel> p, Point_3<Kernel> q, Point_3<Kernel> r, Point_3<Kernel> s)
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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.
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Orientation
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orientation ( Vector_3<Kernel> u, Vector_3<Kernel> v, Vector_3<Kernel> w)
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returns POSITIVE if u, v and w are positively oriented,
returns NEGATIVE if u, v and w are negatively oriented,
and returns COPLANAR if u, v and w are coplanar.
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