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Proceedings. Computer Graphics International (Cat. No.98EX149)最新文献

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Automatic creation of flexible antropomorphic models for 3D videoconferencing 为3D视频会议自动创建灵活的拟态模型
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694305
S. Weik, J. Wingbermühle, W. Niem
{"title":"Automatic creation of flexible antropomorphic models for 3D videoconferencing","authors":"S. Weik, J. Wingbermühle, W. Niem","doi":"10.1109/CGI.1998.694305","DOIUrl":"https://doi.org/10.1109/CGI.1998.694305","url":null,"abstract":"The contribution describes the automatic creation of highly realistic flexible 3D models of participants for distributed 3D videoconferencing systems. The proposed technique uses a flexible mesh template surrounding an interior skeleton structure, which is based on a simplified human skeleton. The vertices of this template are arranged in rigid rings along the bones of the skeleton. Using 3D data obtained by a shape from silhouette approach the size and shape of the mesh template is adapted to the real person. Texture mapping of the adapted mesh using real camera images leads to a natural impression. The mesh organization in rigid rings allows an efficient surface deformation according to the skeleton movements. Once the resulting model is transmitted, it can be animated subsequently using the simple parameter set of the interior skeleton structure. Results obtained with real image data confirm the eligibility of the animated person models in terms of realism and efficiency for 3D videoconferencing applications.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126818576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Multiresolution triangular B-spline surfaces 多分辨率三角形b样条曲面
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694264
A. Dreger, M. Gross, J. Schlegel
{"title":"Multiresolution triangular B-spline surfaces","authors":"A. Dreger, M. Gross, J. Schlegel","doi":"10.1109/CGI.1998.694264","DOIUrl":"https://doi.org/10.1109/CGI.1998.694264","url":null,"abstract":"We present multiresolution B-spline surfaces of arbitrary order defined over triangular domains. Unlike existing methods, the basic idea of our approach is to construct the triangular basis functions from their tensor product relatives in the spirit of box splines by projecting them into the barycentric plane. The scheme works for splines of any order where the fundamental building blocks of the surface are hierarchies of triangular B-spline scaling functions and wavelets spanning the complement spaces between levels of different resolution. Although our decomposition and reconstruction schemes operate in principle on a tensor product grid in 3D, the sparsity of the arrangement enables us to design efficient linear time algorithms. The resulting basis functions are used to approximate triangular surfaces and provide many useful properties, such as multiresolution editing, local level of detail, continuity control, surface compression and much more. The performance of our approach is illustrated by various examples including parametric and nonparametric surface editing and compression.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"81 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124781648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Scaling VR in VRML: integrating different VR methodologies in a VRML browsing system 在VRML中扩展VR:在VRML浏览系统中集成不同的VR方法
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694311
R. Dörner, Volker Luckas, Arno Schäfer, F. Seibert, H. Ziegler
{"title":"Scaling VR in VRML: integrating different VR methodologies in a VRML browsing system","authors":"R. Dörner, Volker Luckas, Arno Schäfer, F. Seibert, H. Ziegler","doi":"10.1109/CGI.1998.694311","DOIUrl":"https://doi.org/10.1109/CGI.1998.694311","url":null,"abstract":"In this paper we examine the potential of the virtual reality modeling language (VRML) to support different methodologies used in virtual reality (VR), like head tracking or special VR input and output devices. A realization concept is presented and its implementation in the VRML browser CASUS Presenter is described.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125521485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Interactive, animated 3D widgets 交互式的、动画的3D小部件
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694279
J. Döllner, K. Hinrichs
{"title":"Interactive, animated 3D widgets","authors":"J. Döllner, K. Hinrichs","doi":"10.1109/CGI.1998.694279","DOIUrl":"https://doi.org/10.1109/CGI.1998.694279","url":null,"abstract":"If 3D applications become large, hierarchical networks of geometric objects lead to messy specifications. Furthermore, if time- and event-dependencies are merged with geometric modeling, complex animations and interactions cannot be modeled independently and hierarchically since their specifications are dispersed throughout the static scene description. The authors present an object-oriented architecture for interactive, animated 3D widgets which reduces the complexity of building 3D applications. 3D widgets encapsulate geometry and behavior into high-level building blocks based on two types of directed acyclic graphs, geometry graphs and behavior graphs. 3D widgets construct internal geometry graphs and behavior graphs, and perform operations on these graphs through high-level interfaces which hide details and raise the level of abstraction. 3D widgets define object ports which are used to link together different 3D widgets. A visual language for 3D widgets allows the developer the interactive construction of 3D applications.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116479214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 26
Integration of basic CAD functions into a VR environment 将基本CAD功能集成到VR环境中
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694271
R. Rabatje
{"title":"Integration of basic CAD functions into a VR environment","authors":"R. Rabatje","doi":"10.1109/CGI.1998.694271","DOIUrl":"https://doi.org/10.1109/CGI.1998.694271","url":null,"abstract":"This paper gives a survey of the integration of basic computer aided design functions in a virtual reality environment. Motivated by the limited input and output devices of present CAD systems, we try to improve the human interaction by using VR for operation in a three dimensional space. This paper presents the underlying data structures and operations, through which the user can transpose his ideas. Some applications are also presented.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"250 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129788392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Sculpting and animating in a desktop VR environment 雕刻和动画在桌面虚拟现实环境
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694266
R. Noble, G. Clapworthy
{"title":"Sculpting and animating in a desktop VR environment","authors":"R. Noble, G. Clapworthy","doi":"10.1109/CGI.1998.694266","DOIUrl":"https://doi.org/10.1109/CGI.1998.694266","url":null,"abstract":"Precise control of the shape of a flexible object during animation is a time-consuming task for the animator, for which there is, as yet, no universally-applicable method. This paper describes a system which provides improved support in this area. In the system, objects are modelled within a stereoscopic environment, and the user interfaces with the system via two hand-held devices, a SpaceBall and a mouse. The object is positioned and oriented by \"holding\" it in one hand, while the other hand employs the mouse to sculpt the object as if it were made of clay, using a \"point and click\" paradigm, rather than the conventional \"pick and drag\" approach. The object is sculpted at several pre-defined key positions before animation begins-these are defined parametrically, allowing animation of the object by interpolation in a straightforward way. To support this process and to ensure that the shape of the object remains sensible between the key positions, an extension to NURBS, called CISSes, has been developed. As a result of rests of a prototype system, the Basic CISS was further developed into the Cuboid CISS. The coherence of the object under animation can be mathematically demonstrated for the Cuboid CISS. This paper describes the Virtual Sculpting environment, the mathematical background of the CISS, and the results obtained using this approach for the animation of a limb. The final section identifies outstanding problems and future areas of work.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114953362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Stability conditions for free form surfaces 自由曲面的稳定性条件
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694248
Hans Hagen, S. Hahmann
{"title":"Stability conditions for free form surfaces","authors":"Hans Hagen, S. Hahmann","doi":"10.1109/CGI.1998.694248","DOIUrl":"https://doi.org/10.1109/CGI.1998.694248","url":null,"abstract":"In CAD/CAM technology, the design of free form surfaces is the beginning of a chain of operations, which ends with the numerically controlled (NC) production of the designed object. An important part of this chain is shape analysis. We present a stability concept for surfaces based on infinitesimal bendings. The infinitesimal rigidity is enforced by certain boundary conditions.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123446860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Using GIS to visualise environmental information a case study based on digital terrain models 利用地理信息系统可视化环境信息——基于数字地形模型的案例研究
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694260
A. Clematis, M. D. Martino
{"title":"Using GIS to visualise environmental information a case study based on digital terrain models","authors":"A. Clematis, M. D. Martino","doi":"10.1109/CGI.1998.694260","DOIUrl":"https://doi.org/10.1109/CGI.1998.694260","url":null,"abstract":"We present an experience of use of geographic information system (GIS) to visualise environmental information. Our experience suggests that digital terrain models may represent a common base to provide consistent information derived combining different data. Some considerations about the use of realistic visualisation (rendering) versus semantic representation based on geometric reasoning are provided.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123585304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Modelling by a rational spline with interval shape control 用区间形状控制的有理样条建模
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694333
M. Sarfraz, M. Al-Mulhem, Jarallah AlGhamdi, M. Raheem
{"title":"Modelling by a rational spline with interval shape control","authors":"M. Sarfraz, M. Al-Mulhem, Jarallah AlGhamdi, M. Raheem","doi":"10.1109/CGI.1998.694333","DOIUrl":"https://doi.org/10.1109/CGI.1998.694333","url":null,"abstract":"Various models have been developed for the design of distinct objects and for applications such as font design, computer aided design (CAD), computer aided engineering (CAE), etc. Some methods are better suited for controlling the shape of the curve on an interval, while others are better suited for controlling the shape at individual control points. The work reviews C/sup 2/ rational splines with interval tension and extends this work for the modelling of interpolatory curves and surfaces through B-spline formulation.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121708022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interactive navigation through glial cells 通过神经胶质细胞进行交互导航
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694252
Jörg Meyer, H. Hagen, C. Lohr, J. Deitmer
{"title":"Interactive navigation through glial cells","authors":"Jörg Meyer, H. Hagen, C. Lohr, J. Deitmer","doi":"10.1109/CGI.1998.694252","DOIUrl":"https://doi.org/10.1109/CGI.1998.694252","url":null,"abstract":"Glial cells express a large variety of bio-electric and bio-chemical phenomena. A quantitative analysis shows that the brain consists of about 10 to 50 times more glial cells than neurons. Similar to neurons, glial cells implement voltage-dependent and ligand-gated membrane channels. Neurotransmitter receptors associated with ion-selective membrane channels have been described in several types of macroglial cells. Leech giant glial cells provide a good example for studying structural and physiological properties of this cell type. Confocal laser-scanning microscopy generates images from cutting (i.e. focus) planes of the object, in a way that, by varying the focus plane, the object can be resolved and scanned serially at several levels. Artifacts, such as transparent, low contrast, and blurred or fuzzy structures from neighboring slices must be filtered in order to reveal the capillary structure of the cell. With the microscope, the object cannot be rotated by ninety degrees, perpendicular to the viewing direction. Once scanned, the viewing direction cannot be altered any more. Computer graphics allows projections from any perspective angle, so that the cell can be studied in full detail. A visualization system should provide a flexible environment for interactively exploring the cell. Therefore, we have extended our InVIS (Interactive Visualization) system, which has been originally designed for medical applications (CT and MRI), to confocal microscopy. We describe the structure of our system and the addition of new features.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124159796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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