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Kernel::Plane_3
        
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    fo.operator() (  Kernel::RT a,  Kernel::RT b,  Kernel::RT c,  Kernel::RT d)
        
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 |  | 
    creates a plane defined by the equation
 a  x +b  y +c  z + d = 0.
Notice that it is degenerate if a = b = c = 0.
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Kernel::Plane_3
        
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    fo.operator() (  Kernel::Point_3 p,  Kernel::Point_3 q,  Kernel::Point_3 r)
        
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 |  | 
    creates a plane passing through the points p,
 q and r. The plane is oriented such that p, 
 q and r are oriented in a positive sense 
 (that is counterclockwise) when seen from the positive side of the plane.
Notice that it is degenerate if the points are collinear.
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Kernel::Plane_3
        
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    fo.operator() (  Kernel::Point_3 p,  Kernel::Direction_3 d)
        
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 |  | 
    introduces a plane that passes through point p and
 that has as an orthogonal direction equal to d.
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Kernel::Plane_3
        
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    fo.operator() (  Kernel::Point_3 p,  Kernel::Vector_3 v)
        
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 |  | 
    introduces a plane that passes through point p and
 that is orthogonal to v.
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Kernel::Plane_3
        
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    fo.operator() (  Kernel::Line_3 l,  Kernel::Point_3 p)
        
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 |  | 
    introduces a plane that is defined through the three points 
 l.point(0), l.point(1) and p.
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Kernel::Plane_3
        
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    fo.operator() (  Kernel::Ray_3 r,  Kernel::Point_3 p)
        
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 |  | 
    introduces a plane that is defined through the three points 
 r.point(0), r.point(1) and p.
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Kernel::Plane_3
        
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    fo.operator() (  Kernel::Segment_3 s,  Kernel::Point_3 p)
        
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 |  | 
    introduces a plane that is defined through the three points 
 s.source(), s.target() and p.
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Kernel::Plane_3
        
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    fo.operator() (  Kernel::Circle_3 c)
        
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    introduces a plane that is defined as the plane containing the circle.
         |