Split with isocurve can flip direction of surface, both with Shrink on or off.
Se example file if needed.
Split with isocurve flip error.3dm (66.2 KB)
Please fix this for both V5 and V6 if it isn’t fixed.
Yeah, this happens to me all the time… Hasn’t been fixed in V6 either… --Mitch
Yep, got that - looks like Rhino clears the Flip-flag, if there is one.
http://mcneel.myjetbrains.com/youtrack/issue/RH-32419
thanks,
-Pascal
Just now fixed in v6.