### Refresh rates and stereoscopic imaging

When the hardware is running in free running stereoscopic mode and an image or 3D scene is being viewed through LC shutter glasses, the user will see the resulting image at half the original refresh rate through the shutter glasses. Hence a normally acceptable display running at 60Hz becomes a hard to view display running at 30Hz stereoscopic. For this reason when running in stereoscopic modes it is desirable to significantly increase the refresh rate of the graphics mode to values as high as 120Hz to 150Hz (depending on the monitors capabilities), which provides for 60Hz or 75Hz refresh per eye in stereoscopic modes.

The graphics device driver has full support for refresh rate control when setting a display mode via the SetVideoMode function. Stereoscopic applications can use this functionality in combination with the VESA GTF standard to increase the refresh rate of the stereoscopic application to acceptable levels (see the above section on refresh rate control for more information).

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