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Objects in front of the screen are said to be in negative parallax, and background imagery behind the screen is in positive parallax. If an object in stereo pair is in exactly the same spot for both eyes, then it will appear on the screen surface and it will be in zero parallax.
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For example, the simplest way to film a scene set on the side of a building might be to use a camera rig from across the street on a neighboring building, using a zoom lens.
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