A combination of interacting virtual reality (VR) and augmented reality (AR) system is provided where the system automatically switches from VR to AR when the user selected viewpoint coincides, within tolerance, with the observable AR viewpoint. The invention discloses an apparatus adapted to provide...http://www.google.com.au/patents/US6917370?utm_source=gb-gplus-sharePatent US6917370 - Interacting augmented reality and virtual reality
