1. A system for displaying an image of a graphical object on a display device, the position at which the object is displayed being a function of the position from which a viewer views the display device so as to simulate an interactive, three-dimensional viewing environment, comprising: an autoscopic display device; a microprocessor for producing graphics instructions representing a current view of an object based on viewer position; a graphics engine, connected to the microprocessor, for converting the graphics instructions into data capable of driving the display device; a buffer, connected to the graphics engine and the display device, for storing the data; means for determining the position of a viewer relative to the display device of a type wherein the viewer carries no required apparatus to enable the determining of viewer position; means, connected to the means for determining viewer position, for determining the display position of the object based on the determined position of a viewer; means, connected to the means for determining display position and to the buffer, for determining read-out order of the data such that the data may be used to generate a display of that part of the object, in the proper position, viewable from the viewer's position; and means, connected to the buffer, for controlling reading out of the data from the buffer in the order determined by the means for determining read-out order, so as to drive the display device to display only that part of the object, in the proper position, viewable from the viewer's position.