Resulting in a single untrimmed surface

[kev.r (Kevin)]

Here’s a solution using your meshes as input that produces untrimmed surfaces in GH:

Note: this uses the Pufferfish plug-in.

If you bake these surfaces into Rhino they will become split at kinks (polysurfaces) - unless you turning off CreaseSplitting before the bake in Rhino which is not recommended.

Straight Loft by uneven number of segments of curves

If interested here is a little secret using loft in c#, you can get always a single untrimmed surface no matter the curves (even with sharp angles) if we just output it as its surface form without splitting at kinks as Gh+Rhino do native. Then you can use this surface as you would a single surface in gh, divide it, evaluate it ect. (but if you bake that surface into Rhino it will become split at kinks - unless you turning off CreaseSplitting before the bake in Rhino which is not recommended). …

Surface_re.gh (33.9 KB)

-Kevin