
 
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.  

 
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.  

 
introduces a plane that passes through point p and that has as an orthogonal direction equal to d.  

 
introduces a plane that passes through point p and that is orthogonal to v.  

 
introduces a plane that is defined through the three points l.point(0), l.point(1) and p.  

 
introduces a plane that is defined through the three points r.point(0), r.point(1) and p.  

 
introduces a plane that is defined through the three points s.source(), s.target() and p.  

 
introduces a plane that is defined as the plane containing the circle. 