go to the amapi forum, and download the free full functioning amapi 4.15. the interface is confusing, but, it lit the lightbulb for me. then, try some of the demo versions. i use rhino, i love it. it's easy to get the hang of. also, the rhino forum is very helpful. the download is fully functional and gives you 25 saves. try the others, as well...i like rhino because it is easy, and there is alot of support for it here, and at poserpros and rdna.