Thanks David.
I’ve always shied away from the trimmed surface option because it becomes such a nuisance with orca having to redo the trim every time you want to check the hydros and it also breaks (or at least it did last time I tried but years ago) the real-time hydros in Orca. I might revisit this now that I’m dabbling in grasshopper.
I find it too hard to fair the topsides where it really matters with the 3-sided option.
Which leaves us with the tangent UVs. At least the ugly part is usually underwater this way.