Offset surface both sides

Does anyone know how to offset surface both side on Mac? There is no option in the offset tool to choose both sides.

If this question is Grasshopper related (you did not specify a category) You can do two offsets, use a negative value and a positive value, then loft the connection. Or you can use Plug-ins like Pufferfish which have that option on the offset surface. Take your pick.


Offset Both Sides.gh (26.9 KB)

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If you are wanting to offset surface in Rhino, it is the offset surface command options.

Take a look at the two screen shots. One is for the ring which doesn’t display the both side box and the other for a rectangle which does. Both are offset curves.
Can anyone tell me why it’s not showing up on the ring??