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Originally Posted by Inglewood Jack
The unnatural motion is what gives it away in all these cases, almost like the effect is sped up compared to everything else in the shot. maybe they can't slow it down because then other CG problems like simulated textures start popping out.
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It's more like the part where the dwarves all fall down, it looks sped up but it isn't, you're just seeing the actual speed and clear frames of someone falling down rather than a few frames of blur. CG would in some cases be the same, it's actually done "right" in that the correct amount of natural motion given the amount of time, mass of what's moving, all that stuff that goes into what our brains think is normal, but it's bashing up against what we expect in movies so it triggers the "this isn't right" feeling.
That exact same CG could probably be in a video game trailer and no one would think it bad.
In other cases it probably is just bad animation and unnatural motions, and in those cases looks even worse because you get twice as many frames of unnatural motion and you can't hide poor CG or animation with blur.