虚拟社区漫游系统的设计与实现

虚拟社区漫游系统的设计与实现(场景建模)

摘要

虚拟现实技术是由计算机产生，通过视、听、触觉等作用，使用户产生身临其境感觉的交互式视景仿真，具有多感知性、存在感、交互性和自主性等特征。虚拟现实建模语言VRML被用来描述三维物体及其行为，可以构建虚拟世界。VRML的基本目标是建立互联网上的交互式三维多媒体。VRML的出现使得虚拟现实像多媒体和互联网一样逐渐走进我们的生活。

本文主要研究基于VRML的虚拟场景建模、交互、漫游技术，根据虚拟设计及其主要特点，结合3D MAX和Cosmo Worlds，对基于VRML的虚拟现实技术在人们生活领域的应用进行了研究，着重阐述了如何利用VRML语言以生动的模型来模拟和显示现实三维空间，最终以人机交互方式来实现社区三维景观的实时漫游。对建筑楼群的建模采用3D MAX三维造型工具和VRML相结合的方式，对这些模型进行优化。同时为了增加真实性，在虚拟社区中加入树木、游人、汽车等模型。这些模型共同构建整个虚拟三维场景，为市政规划建设提供一个科学简便、形象直观的可视化人机交互平台。

关键词：虚拟现实，VRML，场景建模，虚拟漫游

DESIGN AND IMPLEMENTATION FOR THE VIRTUAL COMMUNITY ROAMING SYSTEM(SCENARIO

MODELING)

ABSTRACT

Virtual reality is a result of computer development, it may create some scenery that includes senses of sight, hearing and touch. Its characteristics are multi-sensation, existent sense, interaction and independence. VRML can descript three dimensional objects and their behaviors, thus can build virtual world. Because of the appearance of VRML，Virtual Reality comes to our life such as multimedia and Internet.

The researches of this paper focus on the modeling, the interacting and the browsing of the VRML-based virtual scene. According to the virtual designing and the main features, unifying the 3D MAX and Cosmo Worlds, based on the VRML virtual reality technology , we have researched the application in the field of people's life. The paper focuses on how to use VRML language to construct in the model vividly to simulate and display realistic three-dimensional space. Finally, we achieved the real-time roaming in the Three-dimensional landscape of the community by human-computer interaction. We have modeled these buildings by the combination of 3D MAX three—dimensional modeling tool and VRML. At the same time, we put other models such as trees，humans and cars into the 3d scene to intensify the sense of the facticity. We use these models to build a virtual three-dimensional scene together, to provide a scientific and simple, intuitive image visualization platform for construction of municipal.

KEY WORDS：virtual reality，VRML，scenario modeling，virtual tour