Surfaces by patch without islands

[Drbohlav]

Hi,
is there any simple solution how to create Surface.ByPatch from polylines where are not islands included? I need to create surface 1 to 6 where surfaces 5 and 6 are not included in surface 4, see picture.
I made it bad way from my point of view.

D4C3D_surfaceIslands.dyn (38.3 KB)
SurfaceIslands.dwg (466.3 KB)

[EdsonMatt]

The output could be PolySurfaces or Solids?

[Nick_Boyts]

My first thought is to create all the surfaces and then look for overlap. Once you have the overlaps grouped you can just get the difference in Surface 4 with Surfaces 5 and 6.

[KirkWM]

How about something like this, I haven’t tested it a ton but got it to work.

[Drbohlav]

Hi @KirkWM, thank you, you helped me. Here is solution.

[Drbohlav]

Maybe there could be a slight modification to remove the warning. Any ideas?