自动化英语资料省公开课一等奖全国示范课微课金奖PPT课件.pptx

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Chapter 14 Virtual Reality
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Key points:  useful terms and definitions of Virtual RealityDifficult points:  applications and features of VRML
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计算机专业英语
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Requirements:
Concept of virtual reality
2. Applications of VRML
3. Describe the features of VRML
4. 了解广告文体特点
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计算机专业英语
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New Words & Expressions:
presentation 陈说，表示 multisensory adj. 多感官
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
stereo 立体，立体感觉 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
visual adj. 视觉 simulation n. 模拟
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
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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— in perspective—of the user.
虚拟现实定义之一：虚拟现实是对由计算机生成、能够实时追踪用户多感官信息一个笼统表述。芝加哥电子可视化试验室（EVL）采取就是这种定义。换句话说，虚拟现实意味着用户被计算机生成图景所包围，这些图景要依据用户运动（如视角转换）而产生改变。
An Introduction to and History of Virtual Reality
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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 difficult.
虚拟现实首次尝试使用了头盔式显示器（HMD）。在HMD中，投影机把实时图景投影到附着于用户所带头盔内小屏幕上。最初，HMD显示平面图片，追踪用户头部运动。但在当代HMD中，因为这项技术变得愈加廉价，立体图片则成为了标准。通常说来，HMD或者分辨率过低或者过于粗笨。因为一个HMD一次只能由一个人使用，所以对图景讨论就愈加困难。
An Introduction to and History of Virtual Reality
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计算机专业英语
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To increase image quality, Fakespace[4] invented the BOOM (Binocular Omni-Orientation Monitor).Very small monitors are mounted on a mechanical arm, and users look into the monitors like they would look into a pair of binoculars. Tracking occurs when the user moves the arm, which changes the perspective. When a user releases the BOOM, another person can look at the same thing from the same perspective, which is an advantage over HMDs. Since real monitors are used, the resolution is good.
为了提升图景质量，Fakespace创造了BOOM（双目全方位监视器）。机械臂上固定着非常小监视器，就象使用双目望远镜一样，用户使用监视器观察。用户移动机械臂时改变了视角，所以实现了追踪。当一个用户不用这个BOOM后，另一个用户能够从相同视角观察到相同事物，这一点BOOM要优于HMD。因为使用了真正监视器，所以分辨率很好。
An Introduction to and History of Virtual Reality
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计算机专业英语
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The concept of a room with graphics projected from behind the walls was invented at EVL in 1992. The images on the walls are usually in stereo to give a depth cue. The main advantage over ordinary graphics systems is that the users are surrounded by the projected images, which means that the images are the users’main field of vision. This is usually called a “CAVE”,CAVE Automatic Virtual Environment. The first CAVE(as well as the concept) was created by the faculty, staff, and students at EVL.
含有墙后投影生成图像房间概念是1992年在EVL创造。墙上图景通常是立体方便能表现出深度。与普通图形系统相比，它主要优势在于用户被投影图像所包围，这意味着这些图景是用户主要视野。它通常被称为CAVE，即洞穴式自动虚拟环境。第一台CAVE（与其概念）是由EVL全体教职员和同学共同创造
An Introduction to and History of Virtual Reality
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计算机专业英语
第8页
New Words & Expressions:
interactive 交互 intranet n. 企业内部互联网
integrate 使成整体，结合 visualization n. 可视化
presentation n. 演示 virtual adj. 虚拟
criteria 准则 authorability n, 创作性
compose 组成，写作，排字 re-usability n. 可重用性
extensibility 可扩展性 explicitly 明白地，明确地
platform 平台 arbitrarily 武断地，任意地
static 静态 animated 动画，活生生
dynamic 动态 hyperlink 超级联接
author v. 制作 available 可利用
registration 注册，登记 community 团体，公用
interoperable 能共同使用 extension n. 延长，范围
scope 范围 specification 规范，说明书
About VRML
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计算机专业英语
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New Words & Expressions:
conceptually 概念地 aural 听觉
modify 更改，修改 mechanisms 机制
primary 原始 composition 合成法，排版
encapsulation 封装 semantic 语义
resolution 分辨率 latitude 纬度，范围，地域
interpretation 解释，说明 mouse 鼠标
implicitly 含蓄地，暗中地 coordinate 坐标
recursively 递归地，回归地 sphere 球体
reference 提及，参考书目 enclose 放入，封闭，包装
hierarchical 分层，层次 spatial adj. 空间
accumulation 积聚，积累 dissipate v. 使消失，失去
intractable 难处理 compact 紧凑，简练
syntax n. 语法
About VRML
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计算机专业英语
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