The report describes the results of a system design study for applying digital image generation techniques to visual simulation for pilot training. The computer generated images are to provide out-the-window scenes for a flight simulator which is to be used for training Air Force pilots. No existing visual system can provide all of the capabilities which are desired in a flight simulator. Digitally generated scenes do overcome many of the shortcomings associated with more conventional approaches but have had limited application because of the difficulty of computing enough image detail. The ability to generate images of more complex and realistic environments is closely tied to advances in digital device technology. The study assesses the impact of recent developments in this area on the design of an image generating system. The conceptual design of an image generator is described. The principles of operation, the system configuration and operational characteristics are discussed. Several key problem areas are explored in depth. Feasible methods of implementation with presently available hardware are examined and an estimate of the hardware complexity is given.