The Dog in I Am Legend
Yep, they also used a green screen to work on the smaller details. Not many people give CGI animals a lot of thought, but they are important in certain films. Real animals can be dangerous, after all.
The Dog in I Am Legend
The guy was wearing a green suit so that they can add the rest of the dog during post-production.
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The Map in The Hunger Games
When you make universes with futuristic technology, filmmakers need to use our current technology to bring these things to life.
The Map in The Hunger Games
Here, you can see that the actors were only manipulating a regular table. After post-production, it turned into this amazing map.