Hello - in plain Rhino, if you use the surrounding edges directly (for tangency) and the inner curves, there is a chance that Patchmight get you something. I’d use maybe 30 by 30 spans.
i was trying to make a single surface but that doesn’t really necessary. but even if i split it into pieces, the breaking lines between pieces should be as smooth as possible.
what is the best way to split it into pieces? or any other advice?
oh, i didn’t know i can use patch command with inner curves. it works. not exactly what i want now but i believe i will get it if i play some with curves.