"Wax" plugin for Vegas is coming out in great shape (currently in beta) and pretty close to being released. Features include full support for 3d objects, lights, camera movement, 3D text, use external 3D model files like .3ds .md2, Particles and a few other plugins... pretty soon would include rotoscoping as well.
Additional beta testers are needed to test the plugin and help improve stability (still having a few stability issues...). Interested Vegas users please send a mail to webmaster-at-debugmode-dot-com to get started.
Thanks
Satish