A CPU of a control system controls a signal processor to effect various calculations to move a player's spaceship on a projection display screen, orient the player's spaceship toward a shooting direction, move a camera position at a rear viewpoint toward the player's spaceship, and orient the shooting...http://www.google.com.hk/patents/US6196919?utm_source=gb-gplus-share專利 US6196919 - Shooting game apparatus, method of performing shooting game, and computer-readable recording medium storing shooting game program
