Jason Harmon shows a handy feature of the UV Layout SOP in Houdini to create flat and straight islands.
Check out this new tutorial from Jason Harmon that shows how you can get straight UV islands in Side FX Houdini using the UV Layout SOP.
Harmon uses a handy feature of the UV Layout SOP to arrange quad groups to perfectly straight islands quickly. The tutorial also covers a few elements of the Curve SOP that are new to Houdini 19.5.