This textbook explains how to create freeform surface and modify them to create freeform face of a solid body using Siemens NX 12. NX is a three dimensional CAD/CAM/CAE software developed by Siemens PLM Software Inc., Germany. Users of NX 9, 10 and 11 can use this book with minor modifications. We provide files for exercises via our website. Most of all files are in NX 6.0 so readers can open the files using NX 6.0 and later releases.It is assumed...