I have been thinking of a solution for this for too long and wanted to see if any of you had any better ideas.
Basically, i have lofted two circular curves and now would like to find (in gh) the line that goes along the most outer edge of the loft. I have made several attempts at this (shown in blue and yellow) but none of them seem to be very exact. For example, one of the approaches is to find the closest points to the centre of each curve and then making a line with those two.

Please let me know if you can think of a better way to do it, thanks in davance!

Hey there!
As you know the loft command produces a surface which is made of the linear connection of the points of both curves(closest points)
so if you evaluate both curves with a single parameter, you can have access to the loft surface lines.
Good Luck.

let’s say you can import a point from rhino, which is completely on one of the curves, then you can use the “Curve Closest Point” component to find the parameter of the location of the point on the curve, and you can use this t parameter as an evaluator for the next steps. It is important to remember to reparametrize your curve

but what i want is that this curve (and therefore point) is automatically selected, as i have to do this for a very large number of components and choosing the right point for every one of them would be almost impossible.

each of these lofts is different to the next, as the circles are in different angles and orientations. precision is quite important, so I don’t think that would fit my purpose very well

i have included another loft to show that they are not all the same.

i am trying to take that loft and split it in two parts, using the surface that i have created from the lines as a cutting tool. however, the split is not working at the moment