http://www.zwsoft.com/forum/viewthread.php?tid=861 Pretty decent user interface and a good start: http://www.youtube.com/watch?v=QTL4ZZipyGA These tools allow you to manipulate solid geometry using edges and points. You can create complex geometry that would be very difficult to do with Inventor's existing / current surfacing tool set. As can be seen these tools give you G1 and G2 continuity control. This would be yet another example / result of the consolidation that has been happening in the CADCAM industry. Looks to me like Autodesk has finally found a way to get serious about surfacing in Inventor. I doubt this could of happened without their purchase of Alias. Jon Banquer San Diego, CA JonBanquer 2010-04-06 18:52:48 http://www.zwsoft.com/forum/viewthread.php?tid=861&pid=4670 It ain't surfacing Jon<img src="i/expressions/face-icon-small-confused.gif" border="0"> mudcrab 2010-04-06 18:57:19