Catenary curves

Not sure if this has been raised and answered before - how can I make catenary curves with Rhino? (these are curves of e.g. hanging ropes)

thanks a lot!
Cyana

Grasshopper has a catenary component. And it’s free.
http://www.rhino3d.com/download/grasshopper/1.0/wip

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Thanks David for your reply. I’ve d/ld and installed Grasshopper, took me some time to find out how it works. Very nice tool.

thanks a lot
Cyana