Hi Mat, so yes there are some differences between that script and the Rhino CreateUVCrv command.

#1 - the Rhino CreateUVCrv command appears to scale its output so it is somewhat close to the control polygon length of the surface. The MoI script does not modify the UV curves and just gives them exactly as they are.

#2 - the Rhino CreateUVCrv command also outputs the outer boundary of the UV space while the MoI script only outputs the trim curves and not an additional outer boundary of UV space.

Currently there isn't any way set up in MoI for scripts to access the additional information that would be needed to do those things.

- Michael