It is able to do it with complex surfaces too, it allows the mesh to strech and compress in these regions. The good thing about that is that I could use it to create the flat pattern of the parasolid file I have attached in my other thread (NX10 sheet metal puzzle) since the sheet metal application in SW was unable to produce such outcome. I was hoping I could at least use the same approach with NX. But I will have to take a look a the file you have attached there before that. Thank you.