It's been done for the world. It's kind of an automatic thing for the camera, I think. I haven't used that much.
No, I think it's set up for the camera, too. You set up ellipsoid collision even after you do the settings above. It should be there, just check it out really close. Basically, you give it a size with the simplevector object and then test it once every game loop. It should be in the move function. You get a z direction from the object, add a little to it with a vector, and then test it with collision. It either stops or moves forward.