I inherited a sketchup model that I have to convert to rhino for 3d printing purposes. One piece of geometry, after creating a dupfaceborder, the linework on the arcs is fragmented, so the arc itself is made up of many tiny straight lines. I want to efficiently convert these lines into a smooth continuous curve in rhino without having to redraw the profile manually. Is there a way to do this with a command? It doesn’t have to follow the profile exactly but close enough would be ok. Including the rhino 5 file of the lines in question. sketchup fragmented lines.3dm (88.3 KB) Thank you. 
Hello - here are a couple of script that might help - one attempts to get an arc from an arc-shaped polyline and the other from an arc-shaped set of points. I’d turn on the points for the curve you have if it is all one polyline and then window select sets of points per arc and run the second script.
ArcFitToPolyline.py (1.4 KB)
ArcFitToPoints.py (1.8 KB)
To use the Python script use RunPythonScript, or a macro:
_-RunPythonScript "Full path to py file inside double-quotes"
Hm - actually it looks like I made a plug-in version of these, combined with some other tools, that might be handier -
Arc3Pt.rhp (19.5 KB)
It has a couple of other arc related commands. You’ll need to unblock the plug in in Windows before drag and drop onto Rhino.
-Pascal
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Thank you Pascal. Ill give it a try now and report back soon!
Hi Pascal. Arc3pt works like a charm. Thank you sir! :)
Now I have to figure out how to make a button that stays on my toolbar so I don’t forget it.
Hi Peter - keep in mind that the boring old macro can do that bit:
! _Arc _StartPoint
-Pascal
New problem. Now I have a heart shape…so its more than just a arc… Ideas?
Nevermind…I just did curve and followed along…