Java 3D在数控仿真中的运用

文章对网络图形建模语言(Java 3D)进行了研究,通过Java 3D构建三维世界,并在网页上显示三维图像,用Java 3D的图形技术,把转换形成的图形格式直接用于仿真之中,不需要利用编程方式进行建模。使得数控加工仿真技术达到缩短加工编程的周期、提高生产效率、降低生产成本的意义。     

Java3D API与Java3D编程技术

Ｊａｖａ３Ｄ ＡＰＩ是应用于３Ｄ图形编程的Ｊａｖａ类包,本文具体介绍Ｊａｖａ３Ｄ ＡＰＩ中主要类的使用,Ｊａｖａ３Ｄ编程模式和显示模式,阐明了Ｊａｖａ３Ｄ编程的思路和方法。     

基于Java3D的Web3D交互式系统的建构

针对Web上对电子商务三维场景漫游的新需要,设计了一种基于Java3D的B／S结构的跨平台交互式三维家具虚拟现实系统。该系统解决了漫游导航、感兴趣区域浏览、视点平滑移动等三维浏览的关键技术,并实现了交互式的三维图形浏览器。该浏览器嵌入Web浏览器之中。系统采用MVC的设计模式;除提拱场景漫游等基本操作外,系统还实现了局部感兴趣区域的浏览和实现家具的任意位置摆放。     

基于Java3D技术的虚拟车辆仿真系统

虚拟车辆仿真是智能交通研究中的重要课题,而运用Java3D技术构建该系统则是一个崭新的研究方向。该文详细地阐述了Java3D技术在虚拟车辆仿真系统中的运用,就具体的设计和所涉及的技术问题进行了系统、深入的分析,并提出新的解决办法。最后,对该领域的技术前景进行了展望。     

基于Java 3D技术的三维地层仿真系统

三维地层仿真是在资源勘探、地震研究等方面重要的课题,而应用Java 3D技术构架该系统则是一个崭新的研究方向。该文阐述了Java 3D技术在地层仿真中的应用,就具体系统的设计和所遇到的问题进行了分析,并提供了解决方法。最后对该领域的发展前景进行了展望。     

基于Java3D的虚拟现实建模方法

当前的虚拟现实建模主要用OpenGL,VRML等语言,分别存在着难以掌握学习、不易 控制等缺点。给出了一种基于Java3D构建方法,即用Java3D描述虚拟物体的几何和物理 特征,充分利用Java语言的面向对象的特征和初学者易学易用的特点来构造虚拟现实场 景。     

分布式虚拟环境在立体合成战役演习仿真中的应用

本文论述了分布式虚拟现实环境的基本概念和体系结构，讨论了涉及的核心技术和解决方案，论述了ＤＶＥ在立体合成战役演习中的应用。     

3D显示技术走向桌面

我们桌面上的显示器,曾从黑白到彩色,又从球面到纯平面,还从CRT到LCD,未来甚至会从LCD过渡到OLED。桌面显示技术就这样走过了一代又一代,让世人领略了一次次的惊喜。那么,下一个惊喜又将是什么呢? 应该是非3D(3 Dimension,三维)桌面显示技术莫属了。过去的显示技术无论多么精良,也只不过是将人们的视觉停留在平面的二维世界中。而3D显示技术则会呈现出一个更加逼真和更具现场感的立体数字虚拟世界,让人们与数字世界的距离更加模糊,它所代表的未来趋势是毋容置疑的。     

基于X3D和Java的虚拟人体运动仿真的研究

人体运动仿真是虚拟现实领域新的研究热点,对X3D的相关知识进行了介绍,研究了利用Java平台和X3D技术实现人体运动的仿真。     

基于VRML与Java3D的虚拟地理环境开发模式探讨

从系统结构、用户开发界面、可扩展性和开发难度、大规模虚拟地形实现、大众性和专业性几个方面对Java3D和VRML两种开发方式特点进行了比较研究。Java3D比VRML更适合于开发大型专业性的虚拟地理环境,而VRML世界拥有大量的资源,且X3D的发展将使VRML的资源更为丰富,更适合于地理教育、地理培训、地理娱乐等大众化领域,若能将Java3D和VRML 结合开发虚拟地理环境则更好。探讨了网格技术在虚拟环境中的应用,并对基于网格技术的网络虚拟地理环境结构框架进行了初步设计。     

三维虚拟仿真产品展示平台的应用与研究

随着网络的迅速发展,网上购物越来越受到人们的青睐。顾客希望能从网站上更详细地了解商品外观和体验功能,因此如何更好地向消费者展示商品是电子商务中吸引用户需要解决的问题。本文所讨论的三维虚拟仿真产品展示平台会给使用者提供一个虚拟仿真的环境,使用户“足不出户”就能有真实的体验,满足用户的浏览需求。     

基于Creator的无人飞行器三维建模和优化技术研究

随着计算机技术、信息技术的快速发展,三维可视化技术已广泛应用于无人飞行器可视化仿真领域.Creator软件是视景仿真业界普遍使用的实时可视化三维建模软件,软件提供了强大的建模功能,能够实现动态系统建模和仿真.本文着重讨论了应用三维建模软件Multigen Creator建立如无人飞行器、发射车、场景地形等三维模型的具体应用,并对三维模型进行了优化和仿真.实践表明,通过使用减少冗余面、实例化、贴图映射技术能够很好地优化模型,使三维模型逼真性和实时性俱佳.     

基于Cult3D与Ajax的三维网络商品组件的设计

介绍了常用的三维显示技术,针对网上购物的特点,采用Cult3D实现了网络商品的3D展现,并就如何实时安装、卸载自选商品配件、实时更换商品材质颜色以及实时变更观察角度等方面给出了相应的解决方案.同时,在网站交互上通过采用Ajax技术,提高了网站的响应速度,给客户提供良好的购物体验.     

Sharpness and noise characteristics of a half‐mirror stereoscopic display

Stereoscopic displays are becoming popular in entertainment and industrial applications. We characterize the spatial resolution and noise properties of a stereoscopic display with a half‐mirror and passive polarizing glasses. The upper display images reflected off the mirror have slightly degraded sharpness and reduced high spatial‐frequency noise resulting in modulation transfer functions (MTFs) of 0.59 and 0.50 at the Nyquist frequency with corresponding noise power spectra (NPS) values of 4.79 × 10^?6 and 5.17 × 10^?6 mm² at 10 mm^?1 in the horizontal and vertical directions. These results are compared to the characteristics of the individual displays with MTF values of 0.64 and 0.53 and NPS values of 6.24 × 10^?6 and 5.87 × 10^?6 mm². The polarizing glasses cause minimal reduction in sharpness and high‐frequency noise. The MTFs in the upper images observed with glasses are decreased to 0.54 and 0.47, while the NPS are decreased to 2.86 × 10^?6 and 2.01 × 10^?6 mm². When both displays are turned on and using the mirror and glasses, the observed luminance for each eye is increased from the luminance of the individual displays owing to crosstalk. We find that sharpness and noise are not affected by the interaction between the displays at the particular geometry tested in this study.     

User experience while viewing stereoscopic 3D television

3D display technologies have been linked to visual discomfort and fatigue. In a lab-based study with a between-subjects design, 433 viewers aged from 4 to 82 years watched the same movie in either 2D or stereo 3D (S3D), and subjectively reported on a range of aspects of their viewing experience. Our results suggest that a minority of viewers, around 14%, experience adverse effects due to viewing S3D, mainly headache and eyestrain. A control experiment where participants viewed 2D content through 3D glasses suggests that around 8% may report adverse effects which are not due directly to viewing S3D, but instead are due to the glasses or to negative preconceptions about S3D (the ‘nocebo effect’). Women were slightly more likely than men to report adverse effects with S3D. We could not detect any link between pre-existing eye conditions or low stereoacuity and the likelihood of experiencing adverse effects with S3D.     

Curved OLED display to effectively enhance natural3D

We studied the stereoscopic effect obtained from a two‐dimensional image without using binocular parallax, which we call “natural3D” (n3D). Unlike a parallax‐based three‐dimensional (3D) display system, n3D causes less tiredness and is free from a decrease of the resolution by half because of image division and viewing position dependence. To make the display with these effects comfortable to use, we conducted statistical tests with sensory evaluation experiments and a quantitative evaluation based on physiological responses. These examinations revealed that the n3D effect can be effectively obtained by using, for example, the characteristics of an organic light‐emitting diode display, such as high contrast and easy bendability. This study discusses optimal display curvatures for displays of different sizes that enhance n3D and reduce tiredness, which are revealed through statistical tests. In addition, we performed an experiment with a frame called an n3D window (n3Dw) that is placed before the display such that a subject views the display through the opening of the frame. We found that the combination of a curve and the n3Dw causes n3D more effectively.     

OpenGL技术在虚拟现实三维重建中的应用

目前,利用专业三维建模软件很难实现虚拟现实所需要的交互性,同时,在OpenGL建立的虚拟现实环境中,也很难通过编程进行复杂的三维建模.因此通过研究比较现在常用的利用OpenGL创建3D模型的方法,提出了一种新方法,即利用3DSMax进行复杂建模,并将模型导出为3DS格式,然后通过在OpenGL下编程控制模型来达到对虚拟现实环境的仿真.最后,利用该方法成功模拟了一个交通事故现场的虚拟环境,并可以对环境中的车辆等事物进行编程控制.     

Viewer experience with stereoscopic 3D television in the home

Stereoscopic 3D television (S3D TV) is now available in the home. However, little published information is available on viewer use or experience. In this study, 120 people from 29 households were given a new TV (active or passive stereoscopic 3D, or conventional 2D) and reported on their television viewing and other screen use on a near-daily basis over 8 weeks. People reported enjoying S3D TV and cinema more than TV and cinema in general, but enjoying S3D video games less than video games in general. S3D TV and video games were both associated with an increased, though still low (∼10%) level of adverse effects, such as headache and eyestrain. I speculate that this may be because video games present a particularly strong conflict between vergence and accommodative demand.     

Web3D技术及新一代标准X3D

阐述了实现Web3D的关键技术及应用前景,VRML97失败的原因,新一代标准X3D的特点和关键技术。