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Until the late 1980s, it was very difficult
and expensive to generate complex images fast enough –
twenty or thirty images a second – for the user to
have the impression of real immersion in a virtual environment,
with instantaneous changes in what he saw corresponding
to movements of his head and eyes. Today this technology
has made considerable progress and there are now high
performance computer cards that can create detailed stereoscopic
images at very high frame rates. Similar devices are also
becoming available for use with ordinary personal computers.
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