Creating wave surface in grasshopper

[Joseph_Oster]

@kadabi.aditya

what if i want to keep my boundaries straight rather that undulating

Like this?

Undulating surface keeping edges straight

Fillet the perimeter curve and ignore points outside of it? [undulating_surface_2020Feb25b] undulating_surface_2020Feb25b.gh (23.7 KB)

WavySurface_2021Feb9a.gh (26.6 KB)

Or if you prefer the wavy surface to go below and above the base surface (yellow group):

WavySurface_2021Feb9b.gh (28.0 KB)