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Curve Ellipse > <Options> 
The Ellipse command draws a closed elliptical curve.
Commandline options  

Default 
Creates the ellipse from the center, first axis, and second axis. Default steps

Deformable 
A NURBS approximation of the curve will be created with the degree and number of points you specify. PointCountSets the number of control points in the curve. 
Vertical 
Draws the ellipse center point and axes perpendicular to the construction plane. Vertical steps

Corner 
Draws the ellipse from the corners of an enclosing rectangle. Corner steps

Diameter 
Draws the ellipse from points on its axes. Diameter steps

FromFoci 
Draws the ellipse from focus points and a point on the curve. FromFoci steps
MarkFociPlaces a point object at the focus locations. 
AroundCurve 
Draws the ellipse around a curve. Steps

Rhinoceros 7 © 20102023 Robert McNeel & Associates. 09Mar2023