trevanian
Rear Admiral
Well...that's because they are real.
Ok, examine this:
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The top shot is DEFINITELY a CGI person. I am convinced of that one. The bottom one I'm not sure either way. I couldn't say.
But answer this: Why would humans be CGI sometimes and real other times? If one is fake (and I'm certain on a few shots) then why not the others?
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Same reason there is a CG Eastwood in SPACE COWBOYS and a real one, for facilitating realization of different environments. SC was mostly minatures, but there was really good cg as well.
The CG characters are all just the aliens, the stuff I've read backs that up. Check a few vfx sites like vfxblog to find a link to vfxplanet (dif URL) that'll give you a few solid info sources.