['< sod > [ [ virtual reality ] ] products and [ [ augmented reality ] ] allow users to interact with digital content in real - time. this can be useful for training simulations, visual perception performance tests, presenting or performing a virtual walk - throughs demonstration in a 3d environment. motion capture technology is frequently used in [ [ digital puppetry ] ] imaging systems to drive computer generated characters in real - time. < eod > < sod > [ [ the virtual reality ] ] products and [ [ augmented reality ] ] providers, such as [ [ usens ] ] and [ [ gestigon ] ], allow users to interact with 3d digital content in real time by capturing hand motions. this can be useful for training training simulations, visual 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 anime characters in real - time. < eod >']