Camera is working great, I can export models from Maya to my app, gravity is programmed (but not tested), and I need to decide between PhysX and Gamebryo collisions.

Gamebryo will probably be easier to control for my own stuff, but PhysX will be better for objects that need to bounce around. I wonder how hard it would be to do some of each, and still have them interact? Probably harder then I want to deal with, but it's something to look into.