Hexagon pattern not working on surface

[HS_Kim]

This could be one way and check the linked topic to understand the trimmed surface subdivision problem.

Subsurface subdivision problem

This is one of the most recurrent question regarding subdivision with trimmed or untrimmed surface. See the link bellow to understand the underlying theory. And I can show you one workaround way on this using Copy Trim and Surface Morph. http://docs.mcneel.com/rhino/5/help/en-us/seealso/sak_splittrim.htm http://docs.mcneel.com/rhino/5/help/en-us/index.htm#commands/untrim.htm [Canvas%20at%2014%3B01%3B24] SubdivisionTrimmedSurface_re.gh (33.0 KB)

Form2_re.gh (24.3 KB)