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Now showing 1 - 10 of 16
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    Introduction to VRML 97
    (Eurographics Association, 1997) Nadeau, David
    VRML (the Virtual Reality Modeling Language) has emerged as the de facto standard for describing 3-D shapes and scenery on the World Wide Web. VRML’s technology has very broad applicability, including web-based entertainment, distributed visualization, 3-D user interfaces to remote web resources, 3-D collaborative environments, interactive simulations for education, virtual museums, virtual retail spaces, and more. VRML is a key technology shaping the future of the web. Participants in this tutorial will learn how to use VRML 97 (a.k.a. ISO VRML, VRML 2.0, and Moving Worlds) to author their own 3-D virtual worlds on the World Wide Web. Participants will learn VRML concepts and terminology, and be introduced to VRML’s text format syntax. Participants also will learn tips and techniques for increasing performance and realism. The tutorial includes numerous VRML examples and information on where to find out more about VRML features and use.
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    On the Computational Requirements of Virtual Reality Systems
    (Eurographics Association, 1997) Dévai, Frank
    The computational requirements of high-quality, real-time rendering exceeds the limits of generally available computing power. However illumination effects, except shadows, are less noticeable on moving pictures. Shadows can be produced with the same techniques used for visibility computations, therefore the basic requirements of real-time rendering are transformations, pre-selection of the part of the scene to be displayed and visibility computations. Transformations scale well, ie, their time requirement grows linearly with the input size. Pre-selection, if implemented by the traditional way of polygon clipping, has a growing rate of N logN in the worst case, where N is the total number of edges in the scene. Visibility computations, exhibiting a quadratic growing rate, are the bottleneck from a theoretical point of view. Three approaches are discussed to speed up visibility computations: (i) reducing the expected running time to O(NlogN) (ii) using approximation algorithms with O(NK) worst-case time, where K is the linear resolution of the image, and (iii) applying parallel techniques leading to logarithmic time in the worst-case. Though the growing rate of the time requirement of pre-selection is significantly slower than that of visibility, it is demonstrated that pre-selection has to deal with a significantly higher amount of data than visibility computations, as the average clipping volume is 1/27 of the volume of the model.
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    Non-manifold and special purpose modelling
    (Eurographics Association, 1997) Stroud, Ian
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    A Million Polygons, a Million Pixels:Which is Heavier?
    (Eurographics Association, 1997) Sillion, F.
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    Building Telepresence Systems: TranslatingScience Fiction into Reality
    (Eurographics Association, 1997) Fuchs, H.
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    Digital Publishing
    (Eurographics Association, 1997) Fellner, Dieter W.
    This presentation covers the general topic of ‘Digital Publishing’ in the context of - the German MEDOC Project and - the German Strategic Digital Library Initiative V3D2 and, more specifically, - in the context of organizing EUROGRAPHICS’97 from the publication point of view. MEDOC is an effort by the German Computer Society (GI) to identify and to address the implications and challenges of digital libraries and electronic publishing on a wide scale. Starting in September 1995 the MEDOC project, partly funded by the German Ministry of Technology, has not only tried to implement a novel architecture for bringing relevant documents to the researcher’s desktop it has also raised the awareness on this important subject within the scientific community as well as within the group of publishers. The scientific counterpart to the application oriented MEDOC project is the strategic initiative V3D2 which is the (German) acronym for ‘Distributed Processing and Delivery of Digital Documents’. This initiative, funded by the German Research Foundation (DFG) over a period of six years and starting in 1997 provides a solid base for researchers from different disciplines (Computer Science, Library Sciences,Applied Sciences, . . . ) to tackle basic research and application issues focusing on ‘generalized electronic documents’. EUROGRAPHICS’97 is the first conference in its series to fully exploit the power of electronic documents and computer networks. This year, the submission of papers, the delivery of papers and attached multimedia material to the IPC members and to the reviewers as well as their online access, the feedback to the authors, and the delivery of the final documents (with the accompanying multimedia data) has been (almost) exclusively carried out electronically. This report briefly describes the architecture behind the work of the program committee from the first call for papers to the production of the printed proceedings and the CD-ROM holding the technical papers, STAR’s and tutorials. The experiences and lessons learned might be valuable to a general audience and not only to those organizing a scientific event in the near future.
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    Java APIs
    (Eurographics Association, 1997) Chaumette, Serge; Miniussi, Alain
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    Finally Everyone Can Work with Highly Complex3D models
    (Eurographics Association, 1997) Rossignac, J.
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    Advanced Applications of Volume Visualization Methods in Medicine
    (Eurographics Association, 1997) Sakas, Georgios; Pommert, Andreas
    Tomographicmedical imaging techniques have become more popular in recent years. The wide availability of CT,MRI and Ultrasound inmost large hospitals results in a rapidly increasing number of examinations with these devices. The State of The Art Report summarises the application of techniques developed over the recent years for visualising volumetric medical data common in modern medical imaging modalities such as CT, MRA, MRI, Nuclear Medicine, 3D-Ultrasound, Laser Confocal Microscopy etc. Although all of the modalities listed above provide ”slices of the body”, significant differences exist between the image content of each modality. The focus of the Report is be less in explaining algorithms and rendering techniques, but rather to point out their applicability, benefits, and potential in the medical environment. In the first part, methods for all steps of the volume visualization pipeline from data preprocessing to object display are reviewed, with special emphasis on data structures, segmentation, and surface- and volume-based rendering. Furthermore,multimodalitymatching, interventionrehearsal, and aspects of image quality are discussed. In the second part applications are illustrated fromthe areas of craniofacial surgery, traumatology, neurosurgery, radiotherapy, and medical education. Furtherly, some new applications of volumetricmethods are presented: 3D ultrasound, laser confocal datasets, and 3D-reconstruction of cardiological datasets, i.e. vessels as well as ventricles. These new volumetric methods are currently under development but due to their enormeous application potential they are expected to be clinically accepted within the next years.
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    Web Design - New design for web sites in a commercial context
    (Eurographics Association, 1997) Barfield, Lon
    The web is a completely new medium and is rapidly taking its place alongside existing media such as television, telephone, CD-ROMS, etc. Any new media requires a new approach to design. How do the advances in the web compare to the historical advances in other media, and what are the factors that play a key role in the design of web sites? It is not just the medium that is developing rapidly, the market is also changing. This is leading to new approaches to the role that the web plays in communication with the public and within organisations.