Here's an example of basic 3D compositing in Vegas Pro. Of course, I still have some tweaking to do, but this is taking an animated 3D character and compositing him into a video using Vegas Pro alone. I can use a combination of Track Motion and Pan Crop to place him in the scene, then so far, use this chain to blend him in:

Layer Dimensionality, Chroma Blur, Color Corrector, Color Curves, and Defocus.