Programs for generating simulated visual and far-infrared imagery of Soviet combatant ships were implemented on a computer system at the Naval Training Equipment Center. These programs were used in a system definition study to determine the characteristics that a real-time computer image generation system must have in order to satisfy trainer performance requirements for processing capacity and resolution. The implemented system consists of data bases at various levels of detail, visual and far-infrared sensor models, and image generation capabilities that include a flexible set of options for various viewing conditions and special features.