Helix
The angle in degrees through which the Helix turns over its length
            
The direction of the axis of the Helix
            
The base point of the Helix axis
            
Pitch will return the linear distance along the axis direction that a helix spans in one complete turn (360 degrees)
            
The radius of the arc
            
public static Helix ByAxis(Point axisPoint, Vector axisDirection, Point startPoint, double pitch = 1, double angleTurns = 360)
Create a Helix. The helix always rotates clockwise about the supplied  axis direction. If viewing along the axis direction, the viewer will see  the point turning clockwise around the axis as it moves along the curve  in the direction of increasing parameter. Pitch is Distance the helix  moves in the axis direction per turn. This can be positive or negative.
            
            