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Orientation
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fo.operator() ( Kernel::Point_3 p, Kernel::Point_3 q, Kernel::Point_3 r, Kernel::Point_3 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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fo.operator() ( Kernel::Vector_3 u, Kernel::Vector_3 v, Kernel::Vector_3 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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Orientation
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fo.operator() ( Kernel::Sphere_3 s)
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returns the orientation of the sphere s.
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