Default constructor for objects of the OdGeEllipArc3d class. Constructs an elliptical arc in the XY plane (normal vector (0.0, 0.0, 1.0)) with center (0.0, 0.0, 0.0), major and minor radii set to 1.0, major axis set to (1.0, 0.0, 0.0) and minor axis set to (0.0, 1.0, 0.0).