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X-rooms: A PC-based immersive visualization environment

X-rooms: A PC-based immersive visualization environment

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7th international conference on 3d web technology, web3d '02

作者： Isakovic, Karsten dudziak, thomas Köchy, Kai Fraunhofer First Kekulestrasse 7 D-12489 Berlin Germany IT Service Omikron GmbH Mohrenstrasse 63 D-10587 Berlin Germany Technical University Berlin FR 3-3 Franklinstrasse 28/29 D-10587 Berlin Germany

this paper describes X-Rooms™, a PC-based immersive visualization environment with integrated spatial audio, video and graphics. the concept is similar to the original CAVE74; [1], but it uses a novel web-based vis... 详细信息

ISBN: (纸本)1581134681

this paper describes X-Rooms™, a PC-based immersive visualization environment with integrated spatial audio, video and graphics. the concept is similar to the original CAVE® [1], but it uses a novel web-based visualization system running on top of a PC-cluster with Windows XP installed. Compared to other common installations based on expensive high-end unix graphics systems, costs are reduced by up to one magnitude (depending on the installation setup) using of the shelf PC and projector equipment. Using the developed external API X-Rooms systems can be deployed in the same application domain as conventional CAVE systems;in addition several new areas are open for less expensive systems. Processing VRML the X-Rooms system is a high end visualization platform for interaction with online 3d web content. Furthermore, the X-Rooms content can be driven by the web. Copyright 2002 ACM.

关键词： Virtual reality

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web3d in ocean science learning environments: Virtual big beef creek 02

Web3D in ocean science learning environments: Virtual big be...

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7th international conference on 3d web technology, web3d '02

作者： Campbell, Bruce Collins, Paul Hadaway, Hunter Hedley, Nick Stoermer, Mark University of Washington Mail Stop 352142 Seattle WA 98195 United States

ISBN: (纸本)1581134681

the Virtual Reality Modeling Language (VRML), Java 3d software development packages, and World Wide web (the web) offer great potential for delivering three-dimensional, collaborative virtual environments to broad, on-line audiences. these capabilities have significant potential in ocean sciences, so a visualization environment was developed to explore these possibilities. the University of Washington's Virtual Big Beef Creek (VBBC) project has been continuously refined since its initial implementation in April 1999. VBBC affords users the ability to navigate through a data-rich representation of a physical world estuary on Washington State's Olympic Peninsula. One important project goal is to give users a better sense of the overall watershed before they venture out to experience it in person. A second significant goal is to provide a single on-line repository for geo-referenced data obtained through fieldwork (both quantitative and qualitative). the research team has gained insight into application improvements through the participation of Ocean Sciences graduate students, video game enthusiasts, and the general public. In this paper, research challenges, project successes, and project shortcomings are discussed that may inform the larger web3d community. Copyright 2002 ACM.

关键词： Virtual reality

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Facial Animation Framework for the web and mobile platforms 02

Facial Animation Framework for the web and mobile platforms

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7th international conference on 3d web technology, web3d '02

作者： Pandzic, Igor S. Department of Electrical Engineering Linköping University SE-581 83 Linköping Sweden

ISBN: (纸本)1581134681

Talking virtual characters are graphical simulations of real or imaginary persons capable of human-like behavior, most importantly talking and gesturing. they may find applications on the Internet and mobile platforms as newscasters, customer service representatives, sales representatives, guides etc. After briefly discussing the possible applications and the technical requirements for bringing such applications to life, we describe our approach to enable these applications: the Facial Animation Framework. this framework consists of (1) a lightweitht, portable, MPEG-4 compatible Facial Animation Player, (2) a system for fast production of ready-to-animate, MPEG-4 compatible face models and (3) a plethora of MPEG-4 compatible tools for Facial Animation content production. We believe that this kind of approach offers enough flexibility to rapidly adapt to a broad range of applications involving facial animation on various platforms. Copyright 2002 ACM.

关键词： Animation

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Teaching 3d modeling and simulation: Virtual kelp forest case study 02

Teaching 3D modeling and simulation: Virtual kelp forest cas...

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7th international conference on 3d web technology, web3d '02

作者： Brutzman, don Code UW/Br Naval Postgraduate School Monterey CA 93943-5000 United States

ISBN: (纸本)1581134681

Two classes of graduate students learning 3d graphics and analytic simulation at the Naval Postgraduate School modeled the three-dimensional (3d) shape, structure, imagery and motion behaviors of plants and animals in the kelp forest exhibit at the Monterey Bay Aquarium. Our intended audience includes educators and students of all ages, scientific users interested in composing models in a 3d web environment, and the general public. the Virtual Reality Modeling Language (VRML) proved to be an excellent medium for capturing diverse models, composing multiple student efforts, and publishing dynamic results publicly on the web. By focusing on thoroughly modeling a controlled environment, we produced an exemplar 3d graphics site for modeling larger and more sophisticated underwater domains. this project was successfully demonstrated to numerous new users, including 1000 people during the 1998 National Ocean Fair in Monterey. Recent results include scene translation to the Extensible 3d (X3d) Graphics specification, using the Extensible Markup Language (XML) for scene-graph encoding. Overall, this project serves as an interesting case study on teaching contemporary computer graphics to university students with a wide range of backgrounds. Copyright 2002 ACM.

关键词： XML

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Multiresolution streaming mesh with shape preserving and QoS-like controlling 02

Multiresolution streaming mesh with shape preserving and QoS...

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7th international conference on 3d web technology, web3d '02

作者： Chen, Bing-Yu Nishita, Tomoyuki Department of Information Science University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan

ISBN: (纸本)1581134681

How to transmit 3d meshes efficiently has become an important topic on web3d platform, since there are more and more people need to use 3d models on the Internet. the data size of a geometric 3d model is usually large for being able to represent more details of the model, although we do not need to use such a detail model in most cases. Hence, to offer 3d model which shape and features could still be recognized easily with less data size is necessary. Additionally, the network bandwidth of the Internet is not stable actually, how much data is suitable for Internet is also a question. therefore, we propose a new multiresolution streaming mesh for Internet transmission with QoS-like (Quality of Service) controlling in this *** transmitting the streaming mesh with our system, the server first delivers a simplified mesh model with the data size according to the current network bandwidth. If the user at the client side needs to use a more detail model, the server then sends some necessary patches to the client, so that the client program could show the detail model progressively. Our approach is different from previous works, for web3d utilization, the size of the patch data which is used for reconstructing the original 3d model is less, and the shape and features of the simplified model could still be recognized easily. Moreover, our method needs no complex computations, to generate this streaming mesh on demand is possible. With the QoS-like controlling, the transmission rate between the server and the client has been controlled automatically and the users could get the 3d models with proper qualities as their network situations. Copyright 2002 ACM.

关键词： Quality of service

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A scalable force propagation approach for web-based deformable simulation of soft tissues 02

A scalable force propagation approach for web-based deformab...

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7th international conference on 3d web technology, web3d '02

作者： Choi, K.S. Sun, H. Heng, P.A. Cheng, J.C.Y. Department of Computer Science and Engineering Chinese University of Hong Kong Shatin Hong Kong Department of Orthopaedics and Traumatology Chinese University of Hong Kong Shatin Hong Kong

ISBN: (纸本)1581134681

Physically based models and simulation are usually computationally intensive and not suitable for real-time interactive virtual reality applications including on-line medical training and surgical simulation. In this paper, we propose and develop a web-based scalable deformable model by simulating deformation of soft tissues as a successive force propagation process. this approach avoids laborious formulation of stiffness matrices in conventional mass-spring models. Computational speed is optimized by taking into account only the nodes confined in localized deformation regions. Scalability is achieved by controlling the degree of localization. the model is applicable for simulating both hollow and volumetric objects. the proposed technique provides a scalable solution for web-based interactive applications involving soft tissues deformation. Copyright 2002 ACM.

关键词： Stiffness matrix

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VRML data sharing in the spin-3d CVE 02

VRML data sharing in the spin-3D CVE

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7th international conference on 3d web technology, web3d '02

作者： dit Picard, Stéphane Louis degrande, Samuel Gransart, Christophe Chaillou, Christophe Saugis, Grégory Université des Sciences et Technologies de Lille LIFL CNRS UMR 8022 59655 Villeneuve d'Ascq Cedex France France Télécom R and D DIH/HDM/NEW 2 avenue Pierre-Marzin 22307 Lannion Cedex France

ISBN: (纸本)1581134681

In this paper, we present the design and implementation of a VRML97 multi-user layer introduced in SPIN-3d, our distributed Collaborative Virtual Environment. the main consideration of our multi-user extension is the ease of design of multi-user objects from single-user standard VRML97 objects. Any standard VRML97 browser must at least display the single-user content without taking account of the multi-user description. Whereas other approaches use a VRML node insertion mechanism, such as in Living Worlds, our approach uses a substitution mechanism. And beneath our multi-user extension, we use the Common Object Request Broker Architecture to provide a network communication layer for supporting the virtual meetings. Copyright 2002 ACM.

关键词： Middleware

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Implementation of a scripting language for VRML/X3d-based embodied agents

Implementation of a scripting language for VRML/X3D-based em...

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proceedings web3d 2002 symposium: 7th international conference on 3d web technology

作者： Huang, Zhisheng Eliëns, Anton Visser, Cees Intelligent Multimedia Group Div. of Mathematics and Comp. Sci. Vrije University Amsterdam Amsterdam Netherlands

Embodied agents or humanoid avatars may effectively be used to communicate with human users. Currently there is a wide range of specification formalisms and scripting languages for embodied agents, many of which are of a somewhat ad hoc nature lacking clear semantics. In this paper, we discuss the implementation of a scripting language for humanoid avatars in VRML/X3d-based environments. the scripting language STEP is based on dynamic logic, which provides a clear semantics for complex behavioral patterns. Moreover, the implementation of STEP is realized in a platform that extends VRML/X3d with distributed logic programming (dLP), which provides the computational support necessary to realize such complex behavioral patterns as well as the interaction with a (rich media) 3d environment. As an application example, we will discuss the development of an instructional VR for Tai Chi (the Chinese art of movement), illustrating how our approach allows for the creation of reusable libraries of behavioral patterns. We will discuss some implementation issues, in particular how to realize parallel actions and synchronization within an environment.

关键词： Virtual reality

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Building database applications of virtual reality with X-VRML 02

Building database applications of virtual reality with X-VRM...

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7th international conference on 3d web technology, web3d '02

作者： Walczak, Krzysztof Cellary, Wojciech Department of Information Technology Poznan University of Economics Mansfelda 4 60-854 Poznan Poland

ISBN: (纸本)1581134681

A new method of building active database-driven virtual reality applications is presented. the term "active" is used to describe applications that allow server-side user interaction, dynamic composition of virtual scenes, access to on-line data, continuous visualization, and implementation of *** use the X-VRML language for building active applications of virtual reality is proposed. X-VRML is a high-level XML-based language that overcomes the main limitations of the current virtual reality systems by providing convenient access to databases, object-orientation, parameterization, and imperative programming techniques. Applications of X-VRML include on-line data visualization, geographical information systems, scientific visualization, virtual games, and e-commerce applications such as virtual shops. In this paper, methods of accessing databases from X-VRML are described, architectures of X-VRML systems for different application domains are discussed, and examples of database applications of virtual reality implemented in X-VRML are presented. Copyright 2002 ACM.

关键词： Virtual reality

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Early experiences with a 3d model search engine 03

Early experiences with a 3D model search engine

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proceedings web3d 2002 symposium: 7th international conference on 3d web technology

作者： Min, Patrick Halderman, John A. Kazhdan, Michael Funkhouser, thomas A. Princeton University Princeton NJ United States

ISBN: (纸本)9781581136449

New acquisition and modeling tools make it easier to create 3d models, and affordable and powerful graphics hardware makes it easier to use them. As a result, the number of 3d models available on the web is increasing rapidly. How-ever, it is still not as easy to find 3d models as it is to find, for example, text documents and images. What is needed is a "3d model search engine," a specialized search engine that targets 3d models. We created a prototype 3d model search engine to investigate the design and implementation issues. Our search engine can be partitioned into three main components: (1) acquisition: 3d models have to be collected from the web, (2) analysis: they have to be analyzed for later matching, and (3) query processing and matching: an online system has to match user queries to the collected 3d models. Our site currently indexes over 36,000 models, of which about 31,000 are freely available. In addition to a text search interface, it offers several 3d and 2d shape-based query interfaces. Since it went online one year ago (in November 2001), it has processed over 148,000 searches from 37,800 hosts in 103 different countries. Currently 20-25% of the about 1,000 visitors per week are returning users. this paper reports on our initial experiences designing, building, and running the 3d model search engine.

关键词： Search engines

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