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检索条件"任意字段=12th International Conference on 3D Web Technology 2007, Web3D 2007"

共 44 条记录，以下是21-30 订阅

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On-the-Fly Appearance Quantization on the GPU for 3d Broadcasting 07

On-The-Fly Appearance Quantization on the GPU for 3D Broadca...

引用

12th international conference on 3d web technology

作者： Hadim, Julien Boubekeur, Tamy Raynaud, Mickael Granier, Xavier Schlick, Christophe Univ Bordeaux CNRS UMR 5800 Bordeaux France

ISBN: (纸本)9781595936523

this paper presents an improved client-server system that increases the availability of remote 3d data. In order to reduce the required bandwidth, the data related to the appearance (color and normal) involved in the rendering of meshes and point clouds is quantized on-the-fly during the transmission to the final client, without reducing the geometric complexity. Our new quantization technique for the appearance that can be implemented on the GPU, strongly reduces the CPU load on the server-side and the transmission time is largerly decreased.

关键词： Quantization appearance huge models streaming GPU

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sTeam3d: Bringing Together Virtual Communities and CSCW 07

sTeam3D: Bringing Together Virtual Communities and CSCW

引用

12th international conference on 3d web technology

作者： Mischke, Stefan Goetz, Frank Hinn, Robert Hampel, thorsten Univ Paderborn Paderborn Germany

ISBN: (纸本)9781595936523

Today CSCW systems are used in various scientific, economic, and industrial areas. the logical next step is that collaborators not only want to work together by sharing documents or by communicating via mail or chat. Rather it would be more interesting to meet colleagues, business partners, and customers in a virtual world, e.g. to discuss design and look of various products or concepts in 3d space and in real-time. thereby, it is important that the whole cooperative functionality remains available. Most developments that bring a virtual community to the computer desktop are proprietary solutions that only partially contain CSCW features. In order to solve this problem and to provide a satisfying and functional virtual environment our aim was the development of an X3d-based web3d client for a sophisticated CSCW system. As a server system we chose sTeam, a free CSCW system that is part of the debian Linux distribution. Hence, virtual communities are able to use sTeam and our 3d client sTeam3d to get a fully featured CSCW environment.

关键词： computer supported cooperative work computer supported cooperative learning virtual community virtual environment virtual world

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Semantic-based Rules for 3d Scene Adaptation 07

Semantic-based Rules for 3D Scene Adaptation

引用

12th international conference on 3d web technology

作者： Bilasco, Ioan Marius Villanova-Oliver, Marlene Gensel, Jerome Martin, Herve LIG F-38402 St Martin Dheres France

ISBN: (纸本)9781595936523

3d data is democratizing on the web as its becomes available to everybody on almost all access devices. Still, 3d data is a heavy medium, as it contains a lot of geometric and texture information. this Complexity raises a lot of problems, especially when data initially designed for great capacity access devices, is to be deployed on small devices. due to the great heterogeneity of access devices and of their users and usage, the adaptation of already designed data is an important issue. In this paper, we present a rule-based adaptation framework that deals with the adaptation of X3d scenes. An adaptation rule indicates a type of adaptation to be applied to a set of objects which fit with the role criterion. A basic set of adaptation techniques are registered within the framework. the framework is flexible and additional adaptation engines can be registered in order to support large sets of adaptation techniques.

关键词： 3d data rule-based adaptations adaptation framework geometric degradation semantic filtering

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From Coarse-Grained Components to dVE Applications: A Service- and Component-Based Framework 07

From Coarse-Grained Components to DVE Applications: A Servic...

引用

12th international conference on 3d web technology

作者： Zhang, Xiaoyu Gracanin, denis Virginia Tech Dept Comp Sci Blacksburg VA 24061 USA

ISBN: (纸本)9781595936523

distributed Virtual Environments (dVEs) are distributed, similarly virtual worlds where users gather and interact within a shared space. web-based dVE applications are attracting more and more attention. However, building dVE applications requires a significant effort, even with the modern development tools. In this paper we propose a component-based and service-oriented architecture provides a great flexibility for building complex dVE applications. Based on the developed terminology and profile, the framework provides a high level description language for specifying user interaction tasks. the dVE developers can concentrate on the application design rather than worrying about the programming details. the framework also provides a runtime platform for coarse-grained components integration and a shared scene graph for coordinating the presentation for individual users.

关键词： framework coarse-grained component interaction tasks web 3d distributed Virtual Environment web services

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Optimized MPEG-4 animation encoder for motion capture data 07

Optimized MPEG-4 animation encoder for motion capture data

引用

12th international conference on 3d web technology

作者： Preda, Marius Jovanova, Blagica Arsov, Ivica Preteux, Francoise Inst Natl Telecommun F-91011 Evry France

ISBN: (纸本)9781595936523

this paper presents first compression results on using the MPEG-4 BBA standard for encoding motion capture data. We first introduce a detailed description of the main compression mechanisms used in recently BBA standard: prediction, frequency transform, quantization and entropy encoder and discuss the theoretical range of encoding performances. then we introduce an optimized BBA encoder including also a key-frame reduction mechanism and show the compression results on animation files from typical motion capture data-base. We compare the results with the ones reported in literature showing the advantages of the MPEG-4 BBA in terms of bit-rate, complexity and range control.

关键词： 3d graphics animation compression motion capture data MPEG-4 3d Graphics Standard

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Interactive Walkthrough of Large 3d Models of Buildings on Mobile devices 07

Interactive Walkthrough of Large 3D Models of Buildings on M...

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12th international conference on 3d web technology

作者： Mulloni, Alesandro Nadalutti, daniele Chittaro, Luca Univ Udine HCI Lab Dept Math & Comp Sci I-33100 Udine Italy

ISBN: (纸本)9781595936523

Interactive visualization of large 3d architectural models on mobile devices such as PdAs would significantly benefit applications such as indoor navigations and mobile tourist guides, on-site monitoring and annotation of architectural designs at construction sites, evacuation training and evacuation guidance. Although PdAs are becoming more powerful and a few are even equipped with 3d hardware accelerations, their performance does not yet allow to handle a large architectural model at an acceptable frame rate. To face this problem, we propose and experiment a system that exploits hierarchical view frustum culling and portal culling for interactively visualizing 3d architectural models on mobile devices. We also discuss the performance of the system and its integration with our mobile X3d player (MobiX3d). the performance of the system has been evaluated on a large three-floor building with 39 rooms, 42 stairs and 42 doors.

关键词： mobile devices architectural models X3d rendering culling

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3d SPACE: Using depth and Movement for Selection Tasks 07

3D SPACE: Using Depth and Movement for Selection Tasks

引用

12th international conference on 3d web technology

作者： Patterson, dale Griffith Univ Queensland Coll Art Nathan Qld 4111 Australia

ISBN: (纸本)9781595936523

this paper describes two new three dimensional interface components (the Flow and Circulatory system). these components utilize the depth provided by 3d computer graphics to present complex information in a natural three dimensional form for user interaction. Part of a larger research project with the objective of applying 3d computer graphics to the field of human computer interfaces, this research focuses mainly on the content of the 3d space and how users utilize and interact with that content, rather than physical device related issues. Each of the new 3d interface components is designed for a particular mainstream real world interaction task (eg. web search/browsing activities). In addition to the specific components it introduces the concept of "active 3d interfaces", a new style of interface that presents its data to the user rather than statically waiting for the user to interact with it. Each interface is described in terms of its design, function and performance for active 3d interfaces in a range of common interaction tasks.

关键词： 3d User Interface Human Computer Interface Active Interface

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Mobile, hardware-accelerated urban 3d maps in 3G networks 07

Mobile, hardware-accelerated urban 3D maps in 3G networks

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12th international conference on 3d web technology

作者： Nurminen, Antti Aalto Univ FIN-02150 Espoo Finland

ISBN: (纸本)9781595936523

3d maps can visualize static and dynamic features of renal environments, and act as 3d gateways to location-based information. Insufficient network speed has been a major bottleneck for dynamic download of 3d content for mobile devices. 3G network technologies promise to solve this issue, allowing faster response times and higher data rates. Similarly, mobile 3d graphics hardware should provide a dramatic increase in rendering speed. We examine wireless IP network properties, and develop an optimized network scheme suited for navigation purposes. the presented system allows free roaming in the 3d scene, while progressively downloading 3d data. For case platforms, we use two 3G Symbian smart phones, one with 3d hardware improves the rendering performance by over an order of magnitude. By using a compressed network protocol and efficiently formatted 3d data, a textured but lightweight 3d city can be progressively downloaded in 3G network works fast and without degrading application responsiveness.

关键词： mobile computing 3d maps wireless networks VRML

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Generation and Manipulation of H-Anim CAESAR Scan Bodies 07

Generation and Manipulation of H-Anim CAESAR Scan Bodies

引用

12th international conference on 3d web technology

作者： Wang, Qiming Ressler, Sandy National Institute of Standards and Technology

ISBN: (纸本)9781595936523

In this paper we present a procedure to create animated human models, compliant with the H-Anim standard, from 3d CAESAR scan bodies, which were captured using a whole body scan device. We also present a VRML prototype of an "Animated CAESAR Viewer" to view and manipulate the generated CAESAR body animations interactively on the web. the animated body model follows the H-Anim skinned body geometry specification. the vertex blending method has been used for smoother skin deformations. the model can be integrated with motion capture data. Although the process to generate an H-Anim body involves several different techniques, the discussion is focused on the methods of creating segments and assigning vertex weights. the Viewer provides the functions for a user to explore the components of the digital human model, to adjust the joint locations, to make body postures with a direct kinematics method, and control the animation using VCR-like controls. the aim of the Viewer is to help digital human modelers create more realistic postures and motion sequences intuitively.

关键词： H-Anim VRML 3d scan CAESAR 3d animation

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IRVE-Serve: A Visualization Framework for Spatially-Registered Time Series data 07

IRVE-Serve: A Visualization Framework for Spatially-Register...

引用

12th international conference on 3d web technology

作者： Polys, Nicholas F. Shapiro, Michael duca, Karen Virginia Polytech Inst & State Univ Blacksburg VA 24061 USA

ISBN: (纸本)9781595936523

Scientists regularly confront situations where they are trying to understand large quantities of information, that vary over time and space. Analyzing such systems where structure and function are related is still a challenge despite the continued improvement of visualization tools and techniques. Given the spatial basis of many simulations. Information Rich Virtual Environments (IRVEs) can be successful way of presenting heterogeneous information in an intuitively comprehensible form. In this paper we describe the evolution of a web-based IRVE delivery system for simulation data. Our framework decouples geometry, the underlying data set, and the expressive repertory for information display. this allows us to incorporate domain-specific information while providing for easy retargeting of the information displayed in that domain. As a result of these abstractions, we are able to continually expand and improve our visual mappings and components and finally apply our framework in a completely unrelated domain.

关键词： 3d Interaction Visual design Information-Rich Virtual Environments

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