I tend to agree with UNCgold here - Na'vi River Journey isn't perfect, of course, but it distinctly lacks moments like these from Shanghai Pirates where you're "parked" in front of a poorly-masked screen and essentially asked to pretend something exciting is happening:
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Honorable mention goes to this moment where you're meant to feel like you're, like, descening backwards down an underwater waterfall (??), but you're actually just moving slowly backward in front of a confusing and strangely-integrated projection:
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These examples are much like the Ratatouille problem, where the screens meet the floor plainly in the guest's line of sight, and there's no motion-base in the vehicle to really suggest you're
part of the action instead of just seeing it. Of course, Pirates has many more fully-realized dimensional show sets, special effects, and a few nice Animatronics that all help to make up for the Imax Screens, which is much less the case with Ratatouille.
The idea behind these projection dome moments tends to be that "there's no way you could do
THAT practically", but if using projections doesn't
also let you do that thing
convincingly then there's a good chance you'd be better off trying to do something else. What's the point of seeing the Kraken swim overhead and off into the distance if it doesn't impact the audience as if it actually happened?
That, for me, is drawn clearly into focus on something like Na'vi River Journey, where the Hexapedes barely register as meaningful and a minute later the Na'vi Shaman offers an overwhelming wow factor. The hexapedes don't
need to impress the way the Shaman does, but the gulf between how those two elements register with guests is huge and partly the result of the methods by which they're accomplished. Even a simpler Hexapede Animatronic would make a stronger impression. But at least in Na'vi River Journey the physical environment is overwhelmingly realized by physical means, and merely augmented by projections.
If you're trying to give guests the convinving experience of moving through a dynamic and exciting themed environment, projections work best as sprinkles on the cake rather than as a subsitute for the cake itself.