OptionalcenterThe point the ellipse is centered on.
OptionaldirectionThe normal of the plane the ellipse lies in; the default lays it flat on the ground.
OptionalradiusThe half-width across the ellipse's short axis, in model units; must not exceed
radiusMajor.
OptionalradiusThe half-width along the ellipse's long axis, in model units.
A center, a plane normal and two radii for the ellipse edge, wire and face methods of
shapesandgeom.curves.geomEllipseCurve.