A lot of answers here deal with big, bold CGI models, such as the dinosaurs from “Jurassic Park” or the space catastrophes in “Gravity”; however, those effects only seem real because no audience member has ever seen an actual dinosaur or an actual catastrophe in space. Our human brains simply aren’t trained to know what real looks like, in those cases.
But, when you start applying CGI to something quite familiar, such as human faces and human bodies, that’s when we notice the CGI doesn’t look real at all. To this day, even the best CGI can’t do 100% authentic human anatomy (especially faces).
The fact is, those effects sequences that only sparingly use CGI are the most believable. For example, in Marvel’s “Iron Man” and “Avengers” movies, everybody recognizes the difference between the CGI Iron Man and Robert Downey Jr wearing a real Iron Man costume, right?
Well… No. There’s a good chance you don’t recognize the difference.
After the first Iron Man film, RDJ almost never wore a full Iron Man costume (because the suit was so bulky, uncomfortable and downright painful). In those realistic shots where RDJ’s face and gestures are plainly visible and he appears to be wearing the full suit, he’s only wearing the upper torso armor, maybe partial arms and a partial helmet. Two-thirds or more of his body were not costumed at all.
The effects technicians figured out that, as long as RDJ’s actual face and upper body gestures were filmed naturally (as the center of attention), they could computer-generate the rest of his body and the audience would accept it as real.
So, the film effects that use CGI on the perimeter of your vision — rather than as the focal point — are the effects that seem most real to the audience.
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