虚拟现实中虚拟场景的建模技术

Virtual scene modeling technology in virtual reality

虚拟场景建模是虚拟现实技术中的关键技术之一 ,举例介绍分析了三种建模技术及其局限性 :基于图形渲染的建模技术充分利用计算机图形学技术进行虚拟环境的建模和渲染 ,交互性强 ,但计算量大 ,对硬件要求高 ;基于图像的建模技术计算简单 ,真实感强 ,但交互性差 ;基于图形与图像的混合建模技术结合以上两种建模技术的优点 ,既有真实感 ,又有交互性 ,但许多技术问题还待解决 .随着相关技术的发展 ,基于图形与图像的混合建模技术在构造复杂场景中必将得到广泛的应用 .

Virtual scene modeling is one of the key technologies in Virtual Reality. This paper illustrates three kinds of modeling technologies and analyzes their limitations. The graphics-based rendering modeling technology makes the best of computer graphics' modeling and rendering technology to build virtual environment,which is characterized by great interactivity yet large amount of calculations requiring high capability of hardware; the image-based modeling technology needs simple calculations and strong feeling of reality, but the interactivity is poor. The hybrid modeling technology based on graphics and image combines the advantages of the two methods. It has not only great interactivity but also third dimension, but there are many problems needing future solutions. Along with the development of relational technologies, the modeling technology based on graphics and image will be used widely in complex scene.