Whereas the other main 3D engines out there focus on bitmap rendering, FIVe3D does things a little differently. It’s a vector 3D engine, which means it uses the Flash drawing API to render shapes in 3D space. That means lines and curves are exceptionally smooth, and file sizes are exceptionally low. It’s also very strong in 3D text rendering.
While FIVe3D does 3D bitmap and video rendering as well, we recommend you take a look at one of the other engines listed here if you’re going to be doing a lot of that stuff.