The thing to remember is that they are probably mixing actual footage(w/ 
pyrotechnics and whatnot) with CG.  An example would be in Dinosaurs 
with the background bieng actual and the dinosaur and other objects 
being digital.

If you were to recreate the world(with tree include files that have many 
branches, radiosity, media, plus any isosurface) it would take a 
tremendous amount of time to parse and render.  I'm talking about scenes 
that would probably require a better computer (at least better that my 
worthless Compaq).  Such computers as those nice $20,000 SGI's (a little 
out of my price range)





            Brendan Orr

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