The key to making a 3D photo or video appear to have depth is parallax. We all know that when we cover one eye or the other we see slightly different views from each eye. That makes filming a 3D movie deceptively simple — just place two cameras the same distance apart as our eyes, and let them rip.
In reality it is much more complex than that, but at least the director has both views to start with. Converting a 2D movie to 3D requires synthesizing those two views for each of the well over , frames of a feature-length film.
When creating depth using parallax, the director can use either negative parallax, which makes objects appear closer than the viewing screen, or positive parallax, which makes them appear further away. The artificial horizon is rendered simply by having objects on the screen appear as far apart as our eyes, about 2.
The film itself didn't look too dark, and the action scenes were impressive, with no gimmicky poking-out-of-the-screen bits. Of particular note were the scenes of the underwater wreck, which is pushed subtly to the background, while the bubbles and tiny bits of detritus in the water are brought to the foreground. It gave a great sense of moving through the water, even if it was highly reminiscent of this classic screensaver. There were a couple of moments in the three-and-a-half-hour long epic where some on-screen objects looked slightly out of whack with their surroundings, but for the most part I was able to forget about the 3D completely, and focus on wondering how Jack and Rose have ended up below decks again.
I'm still sceptical when it comes to 3D. But if you're looking for an example of the technique handled well and don't mind enduring over three hours of emotional exhaustion , Titanic 3D is worth a look. Have you seen a shockingly poor 3D conversion? Or an example of 3D tech used correctly? Kesha ditched her clothes on Thursday as she communed with nature while on vacation in Hawaii.
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