Grasshopper Surface creation with multiple curves

Grasshopper
,
1

Hi,

As part of my academic study, trying to create a surface similar to the Al Wasl tower, Dubai. I have a set of curves. When I try to sweep, I get a surface which bends along the rail, but I want the to be straight toward the outside and follow the inner curve for the ends. Kindly help me resolve it. I have attached my GH file for reference. Thanks in advance!

image
image786×743 44.8 KB

20260112_Al WASL TOWER.gh (34.6 KB)

2

49K units from the origin!

Looks reasonably good to me but perhaps I don’t understand the problem?

missing
missing207×769 18.3 KB

BTW, renaming components is ill-advised in my experience. Better to rename inputs and outputs instead.

3

This started with a “simple” idea, then got heavily bogged down in data trees. Not very interesting but crucial to getting the job done. This is my version ‘b’, I discarded version ‘a’.

Al WASL TOWER_2026Jan13bb
Al WASL TOWER_2026Jan13bb1404×791 216 KB

Al WASL TOWER_2026Jan13bb.gh (27.2 KB)

4

This version ‘c’ shows a different method that I reconstructed in the white group with most of the purple group at the bottom disabled.

Al WASL TOWER_2026Jan13c
Al WASL TOWER_2026Jan13c1567×798 185 KB

Al WASL TOWER_2026Jan13c.gh (39.1 KB)

Because the extrusion is a single surface, SrfSplit can be used. However, a seam at the corner produces five surface fragments (text panel) instead of the expected four, so I used a different method (SDiff) instead on my previous post.

5

Thanks a lot!