Thanks for the replies
Another question. If I were to shoot, say a helicopter shot for real, and then track the shot in 3D, is it possible to feed this tracking information to a motion control camera, that will repeat the move on a miniature set, in order to blend the two?
It's a long ways off, but if it happens, believe it or not, I may in fact have peter Jackson levels of resources at my disposal. (Hows that for teasing!)
Possible, yes. Sensible? That depends on what it is you're shooting, and the resources you have at your disposal.