A 3-D (three-dimensional) film or S3D (stereoscopic 3D) film is a motion picture that enhances the illusion of depth perception. Derived from stereoscopic photography, a regular motion picture camera system is used to record the images as seen from two perspectives (or computer-generated imagery generates the two perspectives in post-production), and special projection hardware and/or eyewear are used to provide the illusion of depth when viewing the film. 3-D films are not limited to feature film theatrical releases; television broadcasts and direct-to-video films have also incorporated similar methods, primarily for marketing purposes.
Anaglyph (red and cyan glasses)
Anaglyph images were the earliest method of presenting theatrical 3-D, and the one most commonly associated with stereoscopy by the public at large, mostly because of non theatrical 3D media such as comic books and 3D TV broadcasts, where polarization is not practical. They were made popular because of the ease of their production and exhibition.
In an anaglyph, the two images are superimposed in an additive light setting through two filters, one red and one cyan. In a subtractive light setting, the two images are printed in the same complementary colors on white paper. Glasses with colored filters in each eye separate the appropriate images by canceling the filter color out and rendering the complementary color black.
The new era of 3D
In a stereoscopic motion picture, two images are projected superimposed onto the same screen through different polarizing filters. The viewer wears low-cost eyeglasses which also contain a pair of polarizing filters oriented differently (clockwise/counterclockwise with circular polarization or at 90 degree angles, usually 45 and 135 degrees, with linear polarization). As each filter passes only that light which is similarly polarized and blocks the light polarized differently, each eye sees a different image. This is used to produce a three-dimensional effect by projecting the same scene into both eyes, but depicted from slightly different perspectives.
Since no head tracking is involved, the entire audience can view the stereoscopic images at the same time. Additionally, since both lenses have the same color, people with one dominant eye (amblyopia), where one eye is used more, are able to see the 3D effect, previously negated by the separation of the two colors.
Christopher Nolan criticised the comparison of apparent '2D films' with emerging '3D films': "I think it's a misnomer to call it 3D versus 2D. The whole point of cinematic imagery is it's three dimensional... You know 95% of our depth cues come from occlusion, resolution, color and so forth, so the idea of calling a 2D movie a '2D movie' is a little misleading."
Why I think 3D films are good
In my opinion, 3D films immerse you even moreso into the film and despite the gimmicky and cliche tactics used by film makers (such as a hand 'coming out of the screen') the effect is usually subtle but engaging. As the 3D glasses reduce the brightness slightly, it may work better with some movies than others therefore it changes with whatever 3D movie you see.
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