How to flow along Multiple Joined and trimmed surfaces?

Well, that example you’ve posted is still probably tidier than my obliteration. @vikthor 's solution is the cleanest albeit not following the double curvature.

Jim’s question is still important. Or are you only interested in which will do the job quickest pure and simple, with no needs for quality?

The plugin is over at Some V7 wishes - #16 by jim , and is called ProjectObjects.rhp

Edit: In fact now I can’t even reproduce what I had earlier :sweat_smile: