Corel Dream 3d is an older version of Raydream, which I always found difficult use. It's got a great extruding tool, though. If you try Amapi, there's a good forum at Yahoo,which is frequented by Phillip Steiger,a one man support powerhouse. The interface is not standart,but,once you get used to it, you'll whish your other apps were as well thought out. Good luck.