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3D Stereoscopy is the use of duplicate images generated from slightly different angles in order to create a 3D effect. This usually requires the use of 3D glasses to separate the left/right image for each eye.
Stereoscopy and PC Gaming
In actuality, most 3D PC games rendered using DirectX 9 and up can support stereoscopic gaming. To do this, users need to download an additional 3D stereoscopic driver provided by most popular Graphics Processing Unit manufacturers (eg, Nvidia, ATI), then activate this feature in-game usually using a hot-key determined by the 3D stereoscopy driver setup. The driver will then process the scene and render 2 or more images each frame for a 3D effect; since the GPU is processing more information per frame, the frame-rate while having stereoscopic features turned on, is likely to take a dive.
Health Related Issues
Some people can have a difficult time perceiving 3D stereoscopic effects. These commonly happen to people with depth-perception problems, or sometimes is simply viewing the image too close or too far away; please refer to your 3D Stereoscopic driver user manual for the latter case. Some can also feel uncomfortable, or even ill while attempting to view stereoscopic images; in this case one should either take off the viewing glasses and close his/her eyes for a brief moment, or take off his/her eyes off of the screen and let it rest. In more extreme cases, one is advised to stop viewing immediately. For those who have no problems viewing stereoscopic imagery, it is still strongly recommended that one shall take a brief rest for your eyes at least every 30 minutes.
Different Glasses Technologies
For home use there are several types of glasses available, each of which performs the function of delivering a separate picture to each eye:
- Color separation - these work by sending each eye a portion (spectrally) of the light coming from your screen, they are cheap to make and require no special screen.
- Polarization based - these can be linear or circular polarized, in each case some of the pixels on the screen emit light that is polarized in 'opposite' ways, the glasses pass through only the matching polarization. You need a screen that supports this polarization, these are usually in an interleaved alternating line arrangement - they can look aliased if the images are not correctly filtered to account for the missing lines.
- Temporal shutters - these glasses are active and need a source of power, to switch on/off each eye in synchronization with the display of the appropriate frame. They give full resolution display to each eye typically at half the normal frame rate. They can cause issues with other forms of lighting in the environment e.g. florescent lights, that 'beat' due to the lights running at a different frequency.
Within each type of technology there are several variations, but essentially they are much the same within a grouping.