Grasshopper

algorithmic modeling for Rhino

Subsurface is invalid because the trimming V-domain is singular

Hi everyone, I'm having a problem with my understanding of domains:
I'm trying to divide a square surface into 9 subsurfaces (3x3), and keeping only the subsurfaces that are in the corners (see image attached). I got it working in a separate definition, but when I add this to an existing definition, I get the error: "Subsurface is invalid because the trimming V-domain is singular."


Q: How can I fix this?
And how come the U-domain doesn't result in a "singular domain"-error? It's the same as the V-domain.
Can someone please explain?

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Okay, now I see, good to learn that the selfintersecting loft was unintentional:)
I bet Hannes already enlighted you. Ill send the reply I made anyway. Read up on paths.

Again in trying to be helpfull may I say: I would advise you to start over from scratch, make a version 4, and try to avoid recreating geometry that is already there (and stuff you're not using further on).

Happy Grasshoppering!

thank you both for all your help

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