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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 lies to the left of the oriented
line defined by and , returns RIGHT_TURN if
lies to the right of , and returns COLLINEAR if lies
on .
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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 lies on the positive side of the oriented
plane defined by , , and , returns NEGATIVE if
lies on the negative side of , and returns COPLANAR if lies
on .
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