CoEdge
The adjacent Edge associated with the CoEdge
            
The Vertex at which this Edge ends
            
The containing Loop to which the CoEdge belongs
            
The next CoEdge in the containing Loop
            
Curve in parametric space of the owner surface. The curve is in 2D form, thus Z coordinates of this curve are 0.
            
The neighbouring CoEdge in the reverse direction
            
The previous CoEdge in the containing Loop
            
The sense of the CoEdge with respect to its Edge
            
The Vertex at which this Edge starts
            
            