虚拟现实技术将计算机采集到的各类信息以全新的方式组织起来,提供给用户一个趋于人性化的虚拟信息空间,如今通常以全景图象的方式来表示的虚拟场景主要有球面全景图、柱面全景图和立方体全景图3种模式.为了给用户浏览虚拟场景提供一种方便、自然的交互方式,提出了一种对立方体全景图进行实时交互浏览的基本重投影算法及其加速算法,并实现了一个立方体全景图浏览器,实验结果表明,该方法具有最大的观察自由度.

Virtual reality technique organizes all kinds of information with a new mode in computer, and give a virtual information space of human nature. Usually, the virtual scene is denoted by panoramas, it has three kinds: spherical panorama, cylinder panorama and cubic panorama. Firstly this paper discusses the environment map briefly. From our point of view, the theory of environment map is a footstone to building virtual environment. Then it presents the basic and speedup arithmetic of browsing the cubic panorama , and introduces an anti-aliased arithmetic of the environment image to eliminate the distortion of the image. At last, the paper implements a cubic panorama browser. The browser has functions as follow: roaming in any direction in the virtual environment and the display speed is in direct ratio to the speed of the mouse; cruising the virtual environment with zooming in or zooming out. The browser also provides anti-aliased functions in following situation: real-time anti-aliased function, actionless anti-aliased function and no anti-aliased function. The browser can make user get the biggest freedom and give a kind of convenient and natural interactive mode.