i need the uv structure on this surface ，this is my surface and grasshopper ，why i can’t dispaly the uv on this surface，please help me!!!
Hi,
That’s because your surface is trimmed. You can only get UV isocurves / subdomains for untrimmmed surfaces.
You could split the surface bu the isotrims borders. Or the other way around.
thank you !! teddy!! I figure it out !!