Many people think that 3D movies such as IMAX films require special 3D animation in a modeling and animation program, and that there's some trick to it: a technique used, a special button you push, a process you run. In truth, that's not how it works at all.
Answer : 3D movies are created by a combination of cinematography and optics; in effect, they're optical illusions. The majority of 3D films are actually two films playing at the same time; each one has been designed so it's meant to be viewed by either your left eye or your right eye. The 3D glasses you wear filter those images, making sure they're interpreted correctly by your optical sensors (in other words, your eyes). Your eyes and brain naturally combine two images into one; it's the basic principle of sight. When this happens with the two images from a 3D film, you get a layered optical illusion that creates three-dimensional depth (and in my case, a ripping case of eyestrain; Avatar had me walking into things for days).
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