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3-D film
From Wikipedia,the free encyclopedia
In film,the term 3-D (or 3D) is used to describe any visual presentation system that attempts to maintain or recreate moving images of the third dimension,the illusion of depth as seen by the viewer.
The technique usually involves filming two images simultaneously,with two cameras positioned side by side,generally facing each other and filming at a 90 degree angle via mirrors,in perfect synchronization and with identical technical characteristics.When viewed in such a way that each eye sees its photographed counterpart,the viewer's visual cortex will interpret the pair of images as a single three-dimensional image.Modern computer technology also allows for the production of 3D films without dual cameras.
Techniques
There are several methods of projecting natural,stereoscopic images.They can be categorized into mainly two categories.
With glasses
Anaglyphic
Polarization
Alternate-frame sequencing (or shutter glasses)
Without glasses
Autostereoscopic displays
Furthermore,alternative systems,such as Pulfrich effect exist,but fall under the realm of "pseudo-stereoscopic" in that two,separate records are not recorded or projected.
In the context of many computer games,3D computer graphics refer to being composed of objects in a virtual 3-D world,not that they can be viewed in 3-D.For a stereoscopic 3-D games,as for everything else stereoscopic,two pictures (one for each eye),are needed.