This script will quickly select all of the edges in your 3d Studio Max model that boarder smoothing group changes. For example, if you have a character who’s smoothing groups change between flesh and clothing, this helps you quickly see where those changes are, and refine your smoothing groups accordingly. You can also use it to create UWV clusters based on your smoothing groups. Finally, it allows you to select all of your smoothing group boarders, or the boarders of only a particular smoothing group.
Select Face Smoothing Group Boundaries Script
Click this link to download the Face Smoothing Group Boundaries Script. Just unzip it to your desktop or somewhere on your hard drive and run it via the Maxscript command menu in 3dsMax.