Thank you for the explanations Michael !

I'll try them out. I have a slight glimmer of understanding :-)

With two curves, there are 4 possible Blends, so if there is a "Toggle" button, maybe the user could toggle the 4 choices,
until the correct one comes up. (?)

Or there could be one checkbox for each curve... fliporient curve1, and fliporient curve2.


Or I'll just use the line segment between the two central points, which I have already tried out.

- Brian

So Input 0 is for the curves, (or edges)
Input 1 is for orientation, and ... etc.

I do not understand how the orientations get in there from picking curves in certain areas, but Flow is doing it too. It must be the Magic of Moi programing.