This is a post by Emma Rudeck on the Tri Star Site.
You probably already know that PTC Creo includes an extension for direct modeling. It’s especially useful for anyone who wants to modify a model without worrying about constraints or maintaining design intent. Often, that’s someone who’s generating concept designs, making last-minute design changes, or working with someone else’s model. PTC Creo 3.0 introduces several new options for the PTC Creo Flexible Modeling Extension (FMX). In the newest release, the software is smarter and more, well, flexible, when it comes to rounds, patterns, and chamfers. I’ll tell you all about those in a minute, but first, let’s look at what’s happened with tangencies. Maintaining Tangencies Let’s say you select some geometry and move it. What becomes of the neighboring surfaces? In most cases, you’ll want them to preserve their tangent connection. So, by default, in PTC Creo FMX, the system will adjust those surfaces and maintain their tangency. If you don’t like the default action, you can apply your own conditions that define how the tangency should be adjusted. For example, you can specify that certain surfaces or radii don’t change. The following demo shows you how it works: