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Vectorize plugin for Rhino 7 Windows and Mac.
Trace plugin for Rhino 6 Windows and Mac.
In Rhino 7, Trace is replaced with Vectorize
The Link: Vectorize for Rhino 7
The Link: Trace plug-in. Download and Dbl-click
The Video: Trace Video (video will demonstrate the steps listed below):
1 cmd: Trace. (as you 'play' with the settings remember the 'Default Value' button... don't worry)
2 cmd: SelOpenCrv. Used to find open curves.
3 cmd: 'ShowEnds' will help you locate the openings. A new command with CrvStart, CrvEnd, etc to help you locate the openings in your curves.
4 Use an appropriate command(s) to 'close' up the open curve(s) with the goal of 'closed' geometry.
For v5 users, Inkscape is a useful tool to create curves from an image. Scroll down Projects/Tutorials/Tab.