if you are needing motion simulation i always thought Aero was cool. i've not been able to get it running on a recent distribution though. i think the source for it is available. check the site, there is a link from SAL. > It's a weird mix of things from what it says there. Some is open source > in Smalltalk but the bit about "a private motion simulation program" > would worry me. Maybe there's a better explanation somewhere. > > Guy -- Oh i've slipped the surly bonds of DOS and danced the skies on Linux silvered wings. http://pfrostie.freeservers.com/cad-tastrafy/ //www.freelists.org/webpage/cad-linux/