algorithmic modeling for Rhino
I'm waiting for the same answer as well...
With regard to the original question. If there is a Line-like curve it will align to this if there are more than one then the longest wins.
If that is consistently the case, then a work around for the original question would be
seems painful. Still wishing for a Plane input to Planar Surface (or has that already been done? I can barely keep up with David's constant interface improvements).
That's a great solution for most similar cases, Danny, thank you.
Unfortunately in the situation when this arose (more than a year ago), the centroid would have often not fallen within the boundaries of the trimming curves.
Retrim takes the 3D trimming curves of one surface and projects them onto another surface. This will only work of the two surfaces are very close together and quite similar.
Copy Trim takes the trimming curves from the source surface UV space and moves them into the target surface UV space, this works on surfaces that are very different, but it's a UV mapping, not a 3D projection.
So retrim actually projects the 3d curves, and is not a UV-based remapping? How does it determine the projection?
"How does it determine the projection?"
Closest point. Retrim is not UV dependant. But it is very fragile, if the two surfaces are not close enough then it will fail.
Then retrim sounds like it should be the most appropriate solution for the original question. One could create a new planar surface oriented as desired, coplanar with the original, and large enough to encompass the original, and then use retrim to map the trim lines onto the new surface.