From patch to untrimmed surface

Hi everyone,
how can I transform a patch into an untrimmed surface?
I need it in order to create a spatial truss structure with lunchbox.
Thank you for your help!

If the patch has more than 4 edges then you cannot. If it has 4 edges then you can.

It has just 4 edges! S, how can I do that?
Thank you for your answer!

Dunno, I’m not seeing any file attached here :grinning:. In that case just look at the surface tab in Grasshopper and surface commands in Rhino. Try them out.

from patch to untrimmed (15.1 KB)

here is the file