EG1999

Permanent URI for this community

https://diglib.eg.org/handle/10.2312/213

Browse

Now showing 1 - 20 of 84

Emotion-based, Multi-person Interactive Theatre - Romeo and Juliet in Hades
(Eurographics Association, 1999) Tosa, Naoko; Nakatsu, Ryohei
Now a days many Interactive Theater research is appeared[1][2][3][4]. We have developed an emotion- based interactive theater system. The characteristic is the use of Interactive Computer Graphics technology and the generation of three-dimensional imagery to create autonomous actors and a cyberspace in which all participants obtain a feeling of immersion. We have developed a system that includes multi person participation, emotion recognition and gesture recognition through. In this system, participants can feel they are actually contributing to the development of the story in cyberspace. This is done a system that shows avatars on thescreen as the alter ego of the participants. We have also produced an interactive story based on this system.
Better Pasting Via Quasi-Interpolation
(Eurographics Association, 1999) Mann, Stephen; Conrad, Blair
In this poster, we show our latest work on surface pasting, a hierarchical modeling technique. In surface pasting, we attach a feature surface to a base surface using an approximation technique. While we can use knot insertion on the feature to get the approximation to any level of tolerance, knot insertion increases the size of the representation of the feature. The work we present in this poster shows how we use quasi-interpolation to improve the approximation, allowing us to use smaller representations of our features.
Virtual lights: a method for expressive visualization
(Eurographics Association, 1999) Martin, Domingo; Torres, Juan Carlos
There has been great interest in expressive visualization over the last few years. This kind of visualization is used in 2D animation, illustration, and schematic drawing. The flat shading and shape lines, which we call external and internal sketches, are all visual charasteristics of this type of visualization. We present an algorithm for obtaining the sketches from a polygonal model. The algorithm is based on the concept of virtual lights, which allows us to control the visualization of internal sketches in a flexible way.
On the Opera Theatre Simulation
(Eurographics Association, 1999) Alberti, Maria A.; Trapani, Paola
In this paper we develop some considerations on multimedia applications, starting from the experience gained by implementing a multimedia representation of an opera theatre: namely the Teatro alla Scala di Milano. After a hyper-realistic approach influenced by current trends in multimedia applications we are now considering a more abstract approach, in order to stimulate the aesthetic experience of a virtual spectator.
Tutorial 7 - 3D Graphics Programming with Java 3D
(Eurographics Association, 1999) Nadeau, David R.; Sowizral, Henry A.
Java 3D is a new cross-platform API for developing 3D graphics applications in Java. Its feature set is designed to enable quick development of complex 3D applications and, at the same time, enable fast and efficient implementation on a variety of platforms, from PCs to workstations. Using Java 3D, software developers can build cross-platform applications that build 3D scenes programmatically, or via loading 3D content from VRML, OBJ, and/or other external files. The Java 3D API includes a rich feature set for building shapes, composing behaviors, interacting with the user, and controlling rendering details. In this tutorial, participants learn the concepts behind Java 3D, the Java 3D class hierarchy, typical usage patterns, ways of avoiding common mistakes, animation and scene design techniques, and tricks for increasing performance and realism.
A Pyramidal Hemisphere Subdivision Method for Monte Carlo Radiosity
(Eurographics Association, 1999) Jolivet, Vincent; Plemenos, Dimitri; Sbert, Mateu
In this paper we present a new method to improve Monte Carlo radiosity by sending more rays towards selected directions. More precisely, we determine regions of the scene where the distribution of the power must be done more accurately. The number of rays sent in a direction is a function of the number of patches contained in a region, a region being a pyramid defined by the centre of the shooting patch and a spherical triangle on the surface of a hemisphere surrounding the patch. Thus, the rays shot from a patch do not have all the same power. The new method allows us not only to obtain fine details much sooner and with lower cost, but also the overall efficiency is considerably increased.
Multiresolution Modeling: Survey and Future Opportunities
(Eurographics Association, 1999) Garland, Michael
For twenty years, it has been clear that many datasets are excessively complex for applications such as real-time display, and that techniques for controlling the level of detail of models are crucial.More recently, there has been considerable interest in techniques for the automatic simplification of highly detailed polygonalmodels into faithful approximations using fewer polygons. Several effective techniques for the automatic simplification of polygonal models have been developed in recent years. This report begins with a survey of the most notable available algorithms. Iterative edge contraction algorithms are of particular interest because they induce a certain hierarchical structure on the surface. An overview of this hierarchical structure is presented,including a formulation relating it to minimum spanning tree construction algorithms. Finally, we will consider the most significant directions in which existing simplification methods can be improved, and a summary of other potential applications for the hierarchies resulting from simplification.
3-D Spatial Skills--A Key to the Effective Use of Computer Graphics Software?
(Eurographics Association, 1999) Sorby, S.A.
Development and evaluation of 3-D spatial visualization skills is discussed. Correlations between measured spatial skills and ability to effectively use computer graphics software are analyzed and strategies to improve 3-D spatial skills are presented.
Adaptive Scattered Data Interpolation with Multilevel Nonuniform B-Splines
(Eurographics Association, 1999) Lin, J.; Huang, Z.
We present an adaptive method for scattered data interpolation. The method is based on multilevel nonuniform Bsplines. It makes use of a coarse-to-fine hierarchy of control lattices to generate a sequence of bicubic nonuniform B-spline functions whose sum approaches the desired interpolation function. Experimental results demonstrate that the method performs better than the method using uniform B-splines.
Virtual Sculpture
(Eurographics Association, 1999) Ferley, E.; Cani, Marie-Paule; Gascuel, Jean-Dominique
We propose here a sculpture metaphor for rapid shape prototyping. This metaphor makes the underlying surface description transparent for the user, enabling him to focus only on the shape being modeled. Our approach is based on implicit surfaces defined as iso-surfaces over a discrete field.
Radiosity for Large Vegetation Scenes
(Eurographics Association, 1999) Mastal, Helmut; Tobler, Robert F.; Purgathofer, Werner
Calculating radiosity solutions for large scenes containing multiple plants is all but impossible using the radiosity method in its original form. With the introduction of sophisticated hierarchical and clustering algorithms radiosity for vegetation scenes becomes a solvable challenge. The precomputation of the diffuse light distribution in leaf canopies of forests and other plants can be used to calculate realistic images, but also for agricultural planning purposes. This state of the art report gives an overview of the methods that can, and have been, used to calculate global illumination in vegetation scenes, including hierarchical methods, statistical methods based on simplifications, and specialized methods that have been optimized to handle scenes with a dense, non-isotropic distribution of objects such as canopies.
Multidimensional Shape Modeling for Animation
(Eurographics Association, 1999) Pasko, Alexander; Adzhiev, Valery; Fausett, Eric
An approach is proposed for generating animation sequences from functionally defined multidimensional shapes. An animation sequence can be considered as a particular case of a multimedia object and can be described using 2D/3D world coordinates, time, color, texture, audio, or other "multimedia coordinates". We introduce a space mapping between geometric coordinates and multimedia coordinates. An example is provided for modeling a multidimensional shape, mapping it onto multimedia space, and subsequently generating the animation sequence Homotopic Fun in 5D space.
Books and Devices from the Old -Their Renaissance in Computer Graphics
(Eurographics Association, 1999) Eberhardt, Bernd; Gürcay, Hasmet; Hanisch, Frank; Hüttner, Tobias; Licht, Oliver; Nill, Benjamin
In the following we present three of our institute’s activities concerning cultural heritage. First we present a reconstruction of the Antikythera Mechanism, which is the world’s oldest calculator of astronomical purpose. The implementation extensively uses engines and sensors from the OpenInventor Graphics Library. This is a particularly interesting example of a delicate object which cannot be exhibited (without the use of a virtual Computer Graphics model) since it is too valuable and delicate. Secondly we illustrate the use of Computer Graphics to make valuable medieval books available to the public. A new texture mapping approach, allows the bilinear interpolation of texture coordinates on an arbitrary triangle mesh. This approach uses projective texture mapping and can therefore utilize the hardware of modern graphic workstations. Lastly we present an application of modern 3D Computer Graphics in the field of reconstructing ancient scientific instruments. The first-four-species calculator of Wilhelm Schickard is made accessible to the public in the World Wide Web using Java3D. All three examples illustrate the use of latest technology to model ancient books or devices.
3D virtual facial reconstruction and visualization of ancient Egyptian mummies using spiral CT data
(Eurographics Association, 1999) Attardi, Giuseppe; Betro, Marilina; Forte, Maurizio; Gori, Roberto; Guidazzoli, Antonella; Imboden, Silvano; Mallegni, Francesco
The problem of rebuilding a face from human remains has been, until now, especially relevant in the ambit of forensic sciences, where it is obviously oriented toward the identification of otherwise unrecognizable corpses; but its potential interest to archaeologists and anthropologists is not negligible. We present here the preliminary results of a joint research among the University of Pisa, the Visualisation Laboratory of CINECA and the CNR-ITABC (Institute of Technologies Applied to Cultural Heritage, National Research Council, Rome) whose aim is reconstructing, through Spiral Computed Tomography data and virtual modelling techniques (in our case with VTK software), 3-D models of the possible physiognomy of ancient egyptian mummies. This work is carried out through a multidisciplinary approach, involving different competences: image processing, anthropology, egyptology, computing archaeology. Main project tasks are: 1. anthropological and egyptological analysis of the head; 2. spiral CT of the head; 3. reconstruction of a 3-D model of the skull generated from CT data processing; 4. reconstruction of soft tissues; 5. application of textures fitting the somatic features.
Towards Spatial Specification of Interactive System
(Eurographics Association, 1999) Rodriguez, M. L.; Gea, M.; Gutiérrez, F. L.
Modern interactive systems are oriented towards information management in a graphical environment. Formal specification techniques [1] help designers to describe systems, focusing on the relevant aspects of the interaction model. We analyse here a new way of describing the specifications of a directmanipulation system and we propose an extension of this concept to cover the specifications of a system based on spatial relationships.
Interfacing Cultural Heritage
(Eurographics Association, 1999) Fleischmann, Monika; Strauss, Wolfgang; Yelistratov, Vladimir
In this paper we describe briefly intuitive physical interface called “Virtual Balance”, present recent modifications and give the most impressive example of its use for navigation in and exploration of reconstructed models of ancient cities. One can imagine that example as a fly on a magic carpet in the ancient cities.
Psychologically-based Walking in a Cluttered Environment
(Eurographics Association, 1999) Gillies, M.F.P.; Dodgson, N.A.
We present a method by which a virtual actor (a computer agent representing a character in an animation) can walk around an environment, automatically stepping over or walking around obstacles in its way. Our algorithms based on theories from visual psychology. The theories used are models of high level visual tasks which can be expressed as simple arithmetic relationships. They can therefore produce realistic behaviour with a low computational overhead.
Improving 3-D Spatial Visualization Skills with Multimedia Software
(Eurographics Association, 1999) Sorby, S. A.; Baartmans, B. J.; Wysocki, A. F.
Development and evaluation of 3-D spatial visualization skills is discussed. Strategies for improving spatial skills are presented and multimedia software being developed by the authors is described. Initial assessment data from beta-testing the software is presented.
Interference Detection in Architectural Databases
(Eurographics Association, 1999) Dias, José Miguel Salles; Gamito, Manuel Noronha; Silva, Jorge; Fonseca, José; Vilar, Miguel; Luo, Yuhua
In this paper we address the problem of geometric interference in architectural databases, that arises when different architecture and structural engineering teams integrate their designs into a common 3D scene. By analysing in detail the current work practices, we have modelled a design verification matrix for interference cheking, between architectural (wall, window and door openning, etc) and structural design elements (column, beam, roof slab, etc). In our novel algorithm, we’ve implemented a Binary Space Partitioning (BSP) scheme for all the scene elements, along with several boolean operators that apply to the BSP tree. Every interference can be expressed as a boolean equation that must hold true. Each pair of architectural and structural elements, from the verification matrix, is substituted into the relevant equations and, if a false result is obtained, an inconsistency is visualy signalled and can be discussed at a distance, using our own multi-user 3D virtual environment.
Virtual Environments as Multimedia Contents Integrators
(Eurographics Association, 1999) Biancardi, A.; Moccia, V.
Broadband networks, the digital nature of current multimedia contents and the increasing crossover between Internet and television are marking the beginning of a cultural revolution. As a tool for the integration of multiple media technologies in three-dimensional virtual spaces, Siru is the ideal environment for the convergence of different sources of information in a unified context. Streaming video and audio, 3D objects, and hypertexts can all be integrated with Siru to build homogeneous compelling digital experiences

Browse

Browsing EG1999 by Issue Date

Results Per Page

Sort Options