Page corner curl

Hello

I’m trying to curl the corner of a surface, keeping the four sides of the plane same throughout.

I’ve tried lofting a surface through lines that are rotated, lines from a series of vectors, and other ways but I’ve not been able to maintain the lengths of the four sides of the plane.

Thanks!

Curl.gh (27.8 KB)
Curl2.gh (13.1 KB)
Curl3.gh (19.5 KB)