Hello, all While learning this beast of a software, I bet everyone has accumulated a bunch of more or less interesting tests and stupid tricks on their hard drives. Here's some of what has been accumulating on mine, before bit rot takes them, hopefully some might inspire others on this same road.. First, one from the mailing list a couple of days ago >>Tom Nixon wrote: >> Is there a quick and dirty way to calculate the center of mass of geometry? >> > Louis Dunlev