计算机专业英语电子教案－孙建忠 第14章.pptVIP

Computer English Chapter 14 Virtual Reality *计算机专业英语 Chapter 14 Virtual Reality * Key points:  useful terms and definitions of Virtual RealityDifficult points:  applications and features of VRML Requirements: Concept of virtual reality 2. Applications of VRML 3. Describe the features of VRML 4. 了解广告文体的特点 New Words Expressions: presentation 陈述，表达 multisensory adj. 多感官的 perspective 透视图，观点 illusion n. 幻想 image 影像，图像 inherently 天性地，固有地 six-surface Cube 六面体 real-time 实时的 stereo 立体的，立体感觉的 resolution n.. 分辨率 mount v. 装配，安装 release v. 释放，放弃 depth cue 深度暗示 projected adj. 投影的 visual adj. 视觉的 simulation n. 模拟 14.1 An Introduction to and History of Virtual Reality Abbreviations: VR (Virtual Reality) 虚拟现实 BOOM(Binocular Omni-Orientation Monitor) 双目全方位监视器 HMD (head-mounted display) 头盔显示器 One definition of virtual reality is a wide-field presentation of computer-generated, multisensory information that tracks a user in real time. This definition is used at the Electronic Visualization Laboratory in Chicago (EVL[1]). In other words, virtual reality[2] means that the user is surrounded by a computer-generated image that changes depending on the movements—i.e.shifts in perspective—of the user. 虚拟现实的定义之一：虚拟现实是对由计算机生成的、能够实时追踪用户的多感官信息的一种笼统表述。芝加哥电子可视化实验室（EVL）采用的就是这种定义。换句话说，虚拟现实意味着用户被计算机生成的图景所包围，这些图景要依据用户的运动（如视角的转换）而产生变化。 14.1 An Introduction to and History of Virtual Reality The first attempt at virtual reality used head-mounted displays (HMDs). In HMDs, projectors feed real-time images to small screens attached inside a kind of helmet that the user wears. In the beginning, HMDs often showed mono pictures, and the user’s head movements were tracked. In modern HMDs, stereo pictures are standard, since the technique has become cheaper. Typically, HMDs either have poor resolution or are too heavy. Because only one person at a time can use an HMD, discussion of images is much more d