Hi @nmwardhana, i could imagine to create a nurbs surface from 3 points too so it has 3 edges and one singularity using:
Rhino.Geometry.NurbsSurface. NurbsSurface.CreateFromCorners
no idea if it’s technically still rectangular under the hood. For adding your own loops and building the brep from scratch, you might take a look at the links from this post. Note the last words too.
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c.