Description of functions operating on 3D circles.

   Circles are represented by a center, a radius and a 3D angle
   representing the normal of the plane containing the circle. 
   C = [xc yc zc R theta phi psi].
   THETA is the colatitude of the normal, in degrees, between 0 and 180
   PHI is the azimut of the normal, in degrees, between 0 and 360
   PSI is the proper rotation of the circle around the normal, between 0
       and 360 degrees
   The parameter PSI is used to locate a point on the 3D circle.

   See also
   circle3dOrigin, circle3dPosition, circle3dPoint, intersectPlaneSphere
   drawCircle3d, drawCircleArc3d, drawEllipse3d

Package: matgeom