Javadoc
The Cone
class represents (according to GML-3.1 spec ) a gridded surface given as a family of
conic sections whose control points vary linearly.
A 5-point ellipse with all defining positions identical is a point. Thus, a truncated elliptical cone can be
given as a 2x5 set of control points <, >. P1 is the apex of the
cone. P2, P3, P4, P5 and P6 are any five distinct points around the base ellipse of the cone. If the horizontal
curves are circles as opposed to ellipses, the circular cone can be constructed using <, >.