| Toolbar | Menu | 
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                             | Curve Curve From Objects > Silhouette | 
The Silhouette command creates outline curves from a selected surface, extrusion, or polysurface object.
To create two-dimensional curves from the silhouettes, use the ProjectToCPlane command.
             
        
Create curves from other objects
Rhino for Mac © 2010-2017 Robert McNeel & Associates. 24-Oct-2017