['< sod > [ [ virtual reality ] ] and [ [ augmented reality ] ] allow users to interact with digital graphical content in near real - time. this can frequently be useful for training simulations, visual vision perception tests, or performing a virtual walk - throughs in a 3d environment. motion capture technology is frequently used in [ [ digital puppetry ] ] systems to drive computer generated characters in real - world time. < eod > < sod > [ [ virtual reality ] ] and [ [ augmented reality ] ] providers, such as [ [ usens ] ] and [ [ gestigon ] ], allow users to interact with digital content presented in real time by capturing hand motions. this can be useful for training simulations, visual perception tests, or performing a virtual walk - throughs in a 3d environment. animation motion capture technology is frequently used widely in [ [ digital puppetry ] ] systems to digitally drive computer generated characters in real - time. < tu eod >']