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