A GRAPHICAL DISPLAY SYSTEM

摘要

A graphical display system which renders images on surfaces encapsulating a user using a prioritised rendering method. The rendered images for the viewport are accessed using an address recalculation pipeline. The image data is accessed by determining a rotational orientation for the image to be displayed and addressing the stored image data on the basis of the determined rotational orientation. The pixel data is displayed by computing a first vector indicative of a pixel location on the display with respect to a viewpoint for the display, computing a second vector indicative of a spatial orientation of the display, combining said first and second vectors into a resultant vector, determining an intersection point of the resultant vector with a substantially closed notional surface when projected from a fixed interior projection point, and mapping said intersection point onto stored image data so as to address image data for display at said pixel location. The system includes at least one graphic renderer for generating image data corresponding to stored object display information for objects to be displayed by the system, a plurality of display memories for storing image data generated by the at least one renderer, and a selection stage for determining which of the plurality of display memories to store image data for a particular object on the basis of a relative position of that object to the user. The display memories are periodically updated with image data from the renderer, and the period between updates is different between different display memories.