基于VRML的虚拟现实技术在世博会场馆模型中的应用

虚拟现实是指用立体眼镜、传感手套等一系列传感辅助设施来实现的一种三维现实。桌面型的虚拟现实技术是利用个人计算机，通过鼠标等输入设备实现与虚拟现实世界的充分交互，成本相对较低。VRML是在Internet上营造虚拟环境的桌面型虚拟现实技术。基于VRML建立的世博会场馆模型，不仅是一个可以在网络上浏览的三维可视化系统，而且可以通过单击场景中的三维模型，将请求传输给服务器端的ASP，访问数据库服务器，并将查询结果以一个新的Web页面显示，具有了初步的信息查询功能，能够实现场景的交互式漫游。介绍如何通过VRML、ASP、数据库、HTML等技术相结合，实现建筑物信息的查询技术，并介绍了如何通过传感器节点和路由节点，实现场景动画和自动漫游的方法．

Application in the World Expo Model Based on the Virtual Reality Technology of VRML

Virtual reality means a kind of threedimensional reality that is realized of sense auxiliary equipment, such as threedimensional glasses, sensing glove, etc.. Desk top virtual reality technology of type to utilize personal computer, realize abundant mutuality with fictitious real world through mouse input equipment, the cost is relatively low. VRML is the tabletop type virtual reality technology of building the fictitious environment on Internet. The World Expo model of generation set up because of VRML is not merely a visual system of threedimension that can be browsed on network, but can pass and click the threedimensional model in the scene, ask to transmit to ASP of an end of server, visit the database server, and will inquire that the result shows in a new web page. It also has preliminary information inquiry functions, can realize the roaming interactively of the scene. This text introduces how to combine together through the technology, such as VRML, ASP, database, HTML, etc., realize the inquiry technology of the information of the buildings, how to realize the scene cartoon and method of roaming automatically through node of the sensor and route node.