Mon Aug 02, 2010 2:54 pm by watusimoto
First, you download the 013 beta, then you hit Ctrl-A until you enter nav mesh zone editing mode.
Actually using them is much more complex, as it involves bot navigation, but basically you want to look in the wiki bot docs under navigation. Basically, you pick an object or point you want to navigate to, and then do a series of getWaypoint() calls, fly to those points, and soon enough you'll arrive at your destination via a relatively efficient path through the level.