In fairness, Clash of the Titans was not originally filmed in 3D and the technology was added after the fact.That and it was just a shitty movie.
Anyway as it stands there are supposedly different levels of quality in both the 3D cameras themselves and the associated processes ,Cameron's being the best.
The Alamo theater in Texas even went as far as to advertise that their screens were set up but Cameron's crew themselves for optimum effect/minimal darkness/poor viewing angles.
Point being even beyond the movie itself ,just like with sound quality, the 3D experience varies greatly from place to place ( and to a lesser degree seat to seat).
but darkness is still definitely a factor( supposedly presently being overcome).
I bet Harry Potter will get it right.
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