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Bernard, Jürgen; Vögele, Anna; Klein, Reinhard; Fellner, Dieter W.

Approaches and Challenges in the Visual-interactive Comparison of Human Motion Data

2017

Linsen, Lars (Ed.) et al.: IVAPP 2017. Proceedings : 8th International Conference on Information Visualization Theory and Applications (VISIGRAPP 2017 Volume 3). SciTePress, 2017, pp. 217-224

International Conference on Information Visualization Theory and Applications (IVAPP) <8, 2017, Porto, Portugal>

Many analysis goals involving human motion capture (MoCap) data require the comparison of motion patterns. Pioneer works in visual analytics recently recognized visual comparison as substantial for visual-interactive analysis. This work reflects the design space for visual-interactive systems facilitating the visual comparison of human MoCap data, and presents a taxonomy comprising three primary factors, following the general visual analytics process: algorithmic models, visualizations for motion comparison, and back propagation of user feedback. Based on a literature review, relevant visual comparison approaches are discussed. We outline remaining challenges and inspiring works on MoCap data, information visualization, and visual analytics.

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Weinmann, Michael; Langguth, Fabian; Goesele, Michael; Klein, Reinhard

Advances in Geometry and Reflectance Acquisition

2016

Sousa, Augusto (Ed.) et al.: Eurographics 2016. Tutorials. The Eurographics Association, 2016, 71 p.

Annual Conference of the European Association for Computer Graphics (Eurographics) <37, 2016, Lisbon, Portugal>

This tutorial is focused on acquisition methods for geometry and reflectance as well as strategies towards an efficient acquisition pipeline to fulfill the demands of industry with respect to mass digitization of 3D contents. We provide a thorough overview of the standard methods for the acquisition of both geometry and reflectance of surfaces with different types of reflectance behavior ranging from diffuse over opaque to specular surfaces or even translucent and transparent surfaces as well as the necessary preliminaries of material appearance and setup calibration. As standard acquisition techniques are only well-suited for a limited range of surface materials, we will also discuss strategies on how an efficient, fully automatic acquisition can still be achieved when no prior information with respect to the surface reflectance behavior is available. In addition, a discussion of strategies regarding an acquisition in the wild, i.e. under uncontrolled conditions, is provided.

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Boubekeur, Tamy; Cignoni, Paolo; Eisemann, Elmar; Goesele, Michael; Klein, Reinhard; Roth, Stefan; Weinmann, Michael; Wimmer, Michael

Harvesting Dynamic 3D Worlds from Commodity Sensor Clouds

2016

Catalano, Chiara Eva (Ed.) et al.: GCH 2016 : Eurographics Workshop on Graphics and Cultural Heritage. Goslar: Eurographics Association, 2016, pp. 19-22

Eurographics Symposium on Graphics and Cultural Heritage (GCH) <14, 2016, Genova, Italy>

The EU FP7 FET-Open project "Harvest4D: Harvesting Dynamic 3D Worlds from Commodity Sensor Clouds" deals with the acquisition, processing, and display of dynamic 3D data. Technological progress is offering us a wide-spread availability of sensing devices that deliver different data streams, which can be easily deployed in the real world and produce streams of sampled data with increased density and easier iteration of the sampling process. These data need to be processed and displayed in a new way. The Harvest4D project proposes a radical change in acquisition and processing technology: instead of a goaldriven acquisition that determines the devices and sensors, its methods let the sensors and resulting available data determine the acquisition process. A variety of challenging problems need to be solved: huge data amounts, different modalities, varying scales, dynamic, noisy and colorful data. This short contribution presents a selection of the many scientific results produced by Harvest4D. We will focus on those results that could bring a major impact to the Cultural Heritage domain, namely facilitating the acquisition of the sampled data or providing advanced visual analysis capabilities.

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Klein, Reinhard; Santos, Pedro; Fellner, Dieter W.; Scopigno, Roberto

GCH 2014. Short Papers - Posters: Eurographics Workshop on Graphics and Cultural Heritage

2014

Goslar : Eurographics Association, 2014

Eurographics Symposium on Graphics and Cultural Heritage (GCH) <12, 2014, Darmstadt, Germany>

Focus of this year's forum is to present and showcase new developments within the overall process chain, from data acquisition, 3D documentation, analysis and synthesis, semantical modelling, data management, to the point of virtual museums or new forms of interactive presentations and 3D printing solutions. GCH 2014 therefore provides scientists, engineers and CH managers a possibility to discuss new ICT technologies applied to data modelling, reconstruction and processing, digital libraries, virtual museums, interactive environments and applications for CH, ontologies and semantic processing, management and archiving, standards and documentation, as well as its transfer into practice. Short papers present preliminary results and work-in-progress or focusing on on-going projects, the description of project organization, use of technology, and lesson learned.

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Klein, Reinhard; Santos, Pedro; Fellner, Dieter W.; Scopigno, Roberto

GCH 2014: Eurographics Workshop on Graphics and Cultural Heritage

2014

Goslar : Eurographics Association, 2014

Eurographics Symposium on Graphics and Cultural Heritage (GCH) <12, 2014, Darmstadt, Germany>

Focus of this year's forum is to present and showcase new developments within the overall process chain, from data acquisition, 3D documentation, analysis and synthesis, semantical modelling, data management, to the point of virtual museums or new forms of interactive presentations and 3D printing solutions. GCH 2014 therefore provides scientists, engineers and CH managers a possibility to discuss new ICT technologies applied to data modelling, reconstruction and processing, digital libraries, virtual museums, interactive environments and applications for CH, ontologies and semantic processing, management and archiving, standards and documentation, as well as its transfer into practice.

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Ackermann, Jens; Goesele, Michael (Betreuer); Klein, Reinhard (Betreuer)

Photometric Reconstruction from Images: New Scenarios and Approaches for Uncontrolled Input Data

2014

Darmstadt, TU, Diss., 2014

The changes in surface shading caused by varying illumination constitute an important cue to discern fine details and recognize the shape of texture less objects. Humans perform this task subconsciously, but it is challenging for a computer because several variables are unknown and intermix in the light distribution that actually reaches the eye or camera. In this work, we study algorithms and techniques to automatically recover the surface orientation and reflectance properties from multiple images of a scene. Photometric reconstruction techniques have been investigated for decades but are still restricted to industrial applications and research laboratories. Making these techniques work on more general, uncontrolled input without specialized capture setups has to be the next step but is not yet solved. We explore the current limits of photometric shape recovery in terms of input data and propose ways to overcome some of its restrictions. Many approaches, especially for non-Lambertian surfaces, rely on the illumination and the radiometric response function of the camera to be known. The accuracy such algorithms are able to achieve depends a lot on the quality of an a priori calibration of these parameters. We propose two techniques to estimate the position of a point light source, experimentally compare their performance with the commonly employed method, and draw conclusions which one to use in practice. We also discuss how well an absolute radiometric calibration can be performed on uncontrolled consumer images and show the application of a simple radiometric model to re-create night-time impressions from color images. A focus of this thesis is on Internet images which are an increasingly important source of data for computer vision and graphics applications. Concerning reconstructions in this setting we present novel approaches that are able to recover surface orientation from Internet webcam images. We explore two different strategies to overcome the challenges posed by this kind of input data. One technique exploits orientation consistency and matches appearance profiles on the target with a partial reconstruction of the scene. This avoids an explicit light calibration and works for any reflectance that is observed on the partial reference geometry. The other technique employs an outdoor lighting model and reflectance properties represented as parametric basis materials. It yields a richer scene representation consisting of shape and reflectance. This is very useful for the simulation of new impressions or editing operations, e.g. relighting. The proposed approach is the first that achieves such a reconstruction on webcam data. Both presentations are accompanied by evaluations on synthetic and real-world data showing qualitative and quantitative results. We also present a reconstruction approach for more controlled data in terms of the target scene. It relies on a reference object to relax a constraint common to many photometric stereo approaches: the fixed camera assumption. The proposed technique allows the camera and light source to vary freely in each image. It again avoids a light calibration step and can be applied to non-Lambertian surfaces. In summary, this thesis contributes to the calibration and to the reconstruction aspects of photometric techniques. We overcome challenges in both controlled and uncontrolled settings, with a focus on the latter. All proposed approaches are shown to operate also on non-Lambertian objects.

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Berndt, Rene; Blümel, Ina; Sens, Irina; Clausen, Michael; Damm, David; Klein, Reinhard; Thomas, Verena; Wessel, Raoul; Diet, Jürgen; Fellner, Dieter W.; Scherer, Maximilian

PROBADO - A Digital Library System for Heterogeneous Non-textual Documents

2012

Eleed Journal, (2012), 8, 5 p.

The goal for Probado was to develop and implement a service for providing contentbased access to non-textual documents, and put this service into production-use in scientific libraries. In particular, a semi-automatic indexing process was focused on, to deal with the ever-increasing amount of available documents. Within the scope of Probado we reached these goals. Particularly we deployed such service-capabilities with our collaboration partner Technische Informationsbibliothek, Hannover for digital, 3D architectural models. For digitized, classical music, content-based query-services were developed with the Bayerische Staatsbibliothek in Munich.

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Ullrich, Torsten; Fellner, Dieter W. (Betreuer); Klein, Reinhard (Betreuer)

Reconstructive Geometry

2011

Graz, TU, Diss., 2011

This thesis "Reconstructive Geometry" presents a new collision detection algorithm, a novel approach to generative modeling, and an innovative shape recognition technique. All these contributions are centred around the questions "how to combine acquisition data with generative model descriptions" and "how to perform this combination efficiently". Acquisition data - such as point clouds and triangle meshes - are created e.g. by a 3D scanner or a photogrammetric process. They can describe a shape's geometry very well, but do not contain any semantic information. With generative descriptions it's the other way round: a procedure describes a rather ideal object and its construction process. This thesis builds a bridge between both types of geometry descriptions and combines them to a semantic unit. An innovative shape recognition technique, presented in this thesis, determines whether a digitized real-world object might have been created by a given generative description, and if so, it identifies the high-level parameters that have been passed to the generative script. Such a generative script is a simple JavaScript function. Using the generative modeling compiler "Euclides" the function can be understood in a mathematical sense; i.e. it can be differentiated with respect to its input parameters, it can be embedded into an objective function, and it can be optimized using standard numerical analysis. This approach offers a wide range of applications for generative modeling techniques; parameters do not have to be set manually - they can be set automatically according to a reasonable objective function. In case of shape recognition, the objective function is distance-based and measures the similarity of two objects. The techniques that are used to efficiently perform this task (space partitioning, hierarchical structures, etc.) are the same in collision detection where the question, whether two objects have distance zero, is answered. To sum up, distance functions and distance calculations are a main part of this thesis along with their application in geometric object descriptions, semantic enrichment, numerical analysis and many more.

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Berndt, Rene; Blümel, Ina; Clausen, Michael; Damm, David; Diet, Jürgen; Fellner, Dieter W.; Fremerey, Christian; Klein, Reinhard; Scherer, Maximilian; Schreck, Tobias; Sens, Irina; Thomas, Verena; Wessel, Raoul

Aufbau einer verteilten digitalen Bibliothek für nichttextuelle Dokumente - Ansatz und Erfahrungen des PROBADO Projekts

2010

Mittermaier, Bernhard (Ed.): eLibrary - den Wandel gestalten. Jülich: Forschungszentrum Jülich, 2010. (Schriften des Forschungszentrums Jülich, Reihe Bibliothek / Library 20), pp. 219-233

Konferenz der Zentralbibliothek im Forschungszentrum Jülich (Wisskomm) <5, 2010, Jülich>

Das PROBADO Projekt ist ein von der DFG gefördertes Leistungszentrum für Forschungsinformation mit dem Ziel des prototypischen Aufbaus und Betriebs einer verteilten digitalen Bibliothek für heterogene, nicht-textuelle Dokumente. Betrachtet werden in diesem Projekt alle Schritte der bibliothekarischen Verwertungskette vom Bestandsaufbau über semi-automatische Inhaltserschließung, bis hin zu visuellinteraktiver Suche und Präsentation sowie Betriebsaspekten. In diesem Beitrag werden der gewählte Ansatz beschrieben und die bislang im Projekt gemachten praktischen und konzeptionellen Erfahrungen systematisiert und eingeordnet.

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Berndt, Rene; Blümel, Ina; Clausen, Michael; Damm, David; Diet, Jürgen; Fellner, Dieter W.; Fremerey, Christian; Klein, Reinhard; Krahl, Frank; Scherer, Maximilian; Schreck, Tobias; Sens, Irina; Thomas, Verena; Wessel, Raoul

The PROBADO Project - Approach and Lessons Learned in Building a Digital Library System for Heterogeneous Non-textual Documents

2010

Lalmas, Mounia (Ed.) et al.: Research and Advanced Technology for Digital Libraries : 14th European Conference ECDL. Proceedings. Berlin, Heidelberg, New York: Springer, 2010. (Lecture Notes in Computer Science (LNCS) 6273), pp. 376-383

European Conference on Research and Advanced Technology for Digital Libraries (ECDL) <14, 2010, Glasgow, UK>

The PROBADO project is a research effort to develop and operate advanced Digital Library support for non-textual documents. The main goal is to contribute to all parts of the Digital Library work flow from content acquisition over indexing to search and presentation. While not limited in terms of supported document types, reference support is developed for classical digital music and 3D architectural models. In this paper, we review the overall goals, approaches taken, and lessons learned so far in a highly integrated effort of university researchers and library experts. We address the problem of technology transfer, aspects of repository compilation, and the problem of inter-domain retrieval. The experiences are relevant for other project efforts in the non-textual Digital Library domain.

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Schneider, Sascha; Encarnação, José L. (Betreuer); Klein, Reinhard (Betreuer)

Interaktive massiv parallele Visualisierung großer Datenmengen aus Strömungssimulationen

2006

Darmstadt, TU, Diss., 2006

Heutzutage sind rechnergestützte Simulationen von physikalischen Strömungsprozessen zu einem sehr wichtigen Thema geworden. Die Einsatzgebiete der Strömungssimulation sind weit gefächert und reichen vom Gebiet der Produktentwicklung bis hin zur Sicherheitsanalyse oder auch Optimierung. Während die Simulation in der Vergangenheit mehr und mehr von der fortwährenden Parallelisierung der zur Verfügung stehenden Hardware profitieren konnte, hat die zugehörige Strömungsdatenvisualisierung in diesem Bereich noch deutliche Defizite. Das Resultat dieses Ungleichgewichtes in der Leistungsfähigkeit endet darin, dass eine Strömungs-Simulation wesentlich mehr Daten pro Zeit zu produzieren in der Lage ist, wie die zugehörige Visualisierung verarbeiten kann. Um dieses Kernproblem der Strömungsdatenvisualisierung zu bewältigen, entwickelt diese Doktorarbeit mehrere strategische Lösungskonzepte. Hierbei wird das Prinzip der Parallelisierung auf die Berechnung der Visualisierung übertragen. Dafür wird ein Konzept für ein Visualisierungssystem entwickelt, dass dazu in der Lage ist, mehrere gleichzeitig aktive Visualisierungsmethoden, seien sie technisch wissenschaftlich oder auch realitätsnah, massiv-parallel zu berechnen und darzustellen. Die Parameter der dabei verwendeten Visualisierungsmethoden sind interaktiv steuerbar, ihre Anwendung auf dedizierte Teile des Datenraumes kontrollierbar. Abgeleitet von einem abstrakten Modell einer Visualisierungsmethode und deren parallelen Repräsentation als Objekt im System, besteht ein wichtiger Kern des entwickelten Ansatzes in der Kapselung der einzelnen Visualisierungsmethoden in so genannte "Proben": Virtuellen Einheiten, deren Position, Transparenz und Größe im Strömungsdatenraum von Nutzer frei steuerbar ist. Einzelne Module des Gesamtsystems sind durch abstrakte Schnittstellen voneinander abgekoppelt. Sie erlauben eine asynchrone und ereignisgesteuerte Berechnung der Visualisierungsalgorithmen bzw. der von ihnen generierten Darstellungsgeometrien wie beispielsweise Partikel, Volumen-Rendering oder Strömungslinien. Losgelöst von den speziellen Datenformaten der Simulationsseite, wird ein für die Visualisierung optimiertes progressives Strömungsdatenformat entwickelt. Mit seiner Hilfe wird die Kompression der Strömungsdaten und damit eine Optimierung des Datenzugriffs für die Visualisierung erreicht. Durch das massiv-parallelisierte System und das progressive Datenformat wird eine Skalierbarkeit der Visualisierung möglich. Sie erlaubt es auf unterschiedlichsten Hardwareplattformen, vom einfachen Laptop bis hin zum Multi-Core CPU/GPU Rechner zu funktionieren - jeweils angepasst an die zur Verfügung stehende Rechenleistung. So wird es möglich, große Strömungsdatenmengen auch auf verhältnismäßig leistungsschwachen Endgeräten darzustellen und zu untersuchen, um dem Ungleichgewicht in der Leistungsfähigkeit zwischen Strömungssimulation und zugehöriger Visualisierung entgegenzuwirken.

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Wacker, Markus; Keckeisen, Michael; Kimmerle, Stefan; Straßer, Wolfgang; Luckas, Volker; Groß, Clemens; Fuhrmann, Arnulph; Sattler, Mirko; Sarlette, Ralf; Klein, Reinhard

Simulation and Visualisation of Virtual Textiles for Virtual Try-On

2005

Research Journal of Textile and Apparel. Special Issue: Virtual Clothing Technology, Vol.9 (2005), 1, 11 p.

In this article we present the whole process chain from the choice of clothes up to the final visualisation and the individual evaluation of fit. First, the automatic prepositioning, providing a good initial simulation state for the cloth-patterns with according seam information. Second, the physical simulation calculating the drape of the garment, where measured material data are integrated. Finally the realistic and interactive visualisation using measured reflection properties and natural illuminations provides the Look & Feel of the materials.

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Sahm, Jörg; Encarnação, José L. (Betreuer); Klein, Reinhard (Betreuer)

Kollaborative Visualisierung großer, interaktiver und dynamischer 3D Szenen auf verteilten Endgeräten

2004

Darmstadt, TU, Diss., 2004

Mit dem Aufkommen des Mobile Computing hat sich in den letzten Jahren ein neues Medium etabliert, welches sehr flexible Formen der Kommunikation ermöglicht. Da der Standard PC sich im mobilen Kontext oftmals als zu unhandlich erwies, wurde eine neue Generation von Geräten wie etwa Laptops, Pocket PCs und mobilen Telefonen entwickelt. Gleichzeitig stieg die Bandbreite der mobilen Netzwerke deutlich an. Heutzutage sehen wird das Versenden verschiedener Medien wie Bilder, Filme, Tonsequenzen oder Texten von und zu beliebigen Standorte in der Welt als selbstverständlich an. Obwohl wir eine 3D Wahrnehmung haben und mit einer 3D Welt interagieren, existieren auch heute noch keine befriedigenden Techniken, um 3D Grafikinformationen an mobile Endgeräte zu übertragen. Das Problem komplexer 3D Szenen liegt in ihrem enormen Daten- und Berechnungsaufwand. Noch schwieriger wird es, wenn wir durch dynamische 3D Szenen in Echtzeit navigieren möchten. Diese Arbeit stellt einen neuen Ansatz vor, um große, interaktive und dynamische 3D Szene zu repräsentieren und an entfernte Endgeräte zu versenden. Der Schlüssel liegt dabei in der Verarbeitung nur derjenigen Objekte, welche auch im Interesse eines Benutzers liegen, sowie in der genauen Anpassung der Komplexität der selektierten Objekte an die Leistungsmerkmale des Endgerätes des Benutzers.

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Wacker, Markus; Keckeisen, Michael; Kimmerle, Stefan; Straßer, Wolfgang; Luckas, Volker; Groß, Clemens; Fuhrmann, Arnulph; Sattler, Mirko; Sarlette, Ralf; Klein, Reinhard

Virtual Try-On: Virtuelle Textilien in der Graphischen Datenverarbeitung

2004

Informatik Spektrum, Vol.27 (2004), 6, pp. 504-511

Durch die beschriebenen Verfahren und die Verwendung realer Eingabedaten, von CAD-Schnittteilen über physikalische Materialparameter bis hin zu gemessenen BTFs, gelingt eine realistische Darstellung von Textilien. Die im Virtual-Try-On Projekt entwickelten Techniken sollen es in naher Zukunft ermöglichen, "Maßkonfektion on demand" herzustellen, die dem jeweiligen Kunden exakt passt.

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Elcacho, Colette; Encarnação, José L. (Betreuer); Klein, Reinhard (Betreuer)

3D Hypermedia Applications: A Hierarchical Component Based Concept for Animation, Interaction and Functionality for 3D Hypermedia Applications in the Internet

2002

Aachen : Shaker, 2002

Berichte aus der Informatik

Darmstadt, TU, Diss., 2001

Today the Internet is a global communication and business platform. Its breakthrough began with the hypertext transfer protocol (HTTP), which sits on top of the Internet protocol TCP/IP and allows the hypertext based interconnection of documents through links in conjunction with a corresponding markup language (HTML). It provides features for the inline visualization of various media types such as image, video and sound. But despite this rich hypermedia functionality, state of the art applications do not exploit the benefits of interactive 3D graphics. It is well known, that: »An image tells more than a thousand words.« (Chinese saying). In many applications, replacing a static image by an interactive 3D application could significantly raise the value to the users by allowing them to actively experience the natural qualities of a model by performing actions and interacting with the model. The advantages of active experience are cherished for long: »I hear and I forget. I see and I remember. I do and I understand.« (Konfuzius). Hypermedia applications could benefit from interactive dynamic 3D visualization. This work shows how. It analyzes the state of the art technologies, unveils major problems in the production process, introduces a component based concept and a respective example implementation. Dynamic, i.e. animated 3D models are the heart of a 3D application. Therefore, first the traditional ways of creating 3D models and animations - the modeling and animation pipelines - are reviewed. It is specified, which requirements must be met by an animated 3D model such that it can be used in an interactive hypermedia application. These requirements must be reflected in the 3D hypermedia application description format. The state of the art technologies are analyzed and the current application description format which comes closest to what would be needed is determined. Based on this, a component based concept for the description of 3D hypermedia applications has been developed, which is independent of the file format. The 3D model component and the animation, i.e. the functional component, which are the heart of the component based concept are introduced first. Second this work analyzes 3D navigation. Intuitive navigation is a key feature required in 3D worlds. The most frequently quoted reason why people are reluctant to use 3D applications is a loss of orientation in the virtual world, caused by bad navigation support. Object-centered navigation is a concept of intuitive motion within a virtual world. Its key aspect is to specify motion steps relative to the object(s) that is (are) in focus. Objectcentered viewpoints provide a discrete motion space and allow for an easy navigation. Tests have shown that the method is preferred by nonexpert users when compared to standard navigation interfaces. Third, the state of the art hypermedia technology with focus on its limited 3D integration capacities is reviewed. Based on the previously specified requirements, a model for fully integrating component based 3D applications into a hypermedia environment is suggested and validated in an implementation. Application examples are presented. The first one shows an interactive three dimensional product catalogue, where each part of the animated 3D product model is interconnected with textual and visual media and vice versa. The product parts can be »touched« and moved. Actions in the model are reflected in the related hypertext document and vice versa. The second example is based on the 3D model of a large building, a construction plant. Both illustrate fully fledged 3d hypermedia applications. The key results of this work show: first of all a concept for effectively integrating 3d models into a hypermedia application context, second that the suggested concepts allows for significant improvement of application development efficiency in terms of time savings, cost reduction and reusability, third that object-centered navigation is a preferred concept for navigating virtual worlds in an intuitive fashion, fourth that these concepts can be exploited in »real world« applications and fifth an exemplary reference implementation. Future work would be e.g. advancements of the object-centered navigation by extending the here presented simple method to a generic path finding algorithm.

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Encarnação, José L.; Klein, Reinhard

Jahresbericht 2000

2001

Darmstadt, 2001

Forschungs- und Arbeitsberichte des Fachgebietes "Graphisch-Interaktive Systeme" GRIS-00-12

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Klein, Reinhard; Elcacho, Colette; Dingel, Thomas

Object-Centered Navigation in Virtual Construction Applications

2001

Skala, Vaclav: WSCG 2001. Conference Proceedings Vol. 1. Plzen: University of West Bohemia, 2001, pp. 33-40

International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG) <9, 2001, Plzen, Czech Republic>

In this paper we present a novel concept for navigation in virtual environments. While a variety of navigation metaphors have been proposed for immersive VR, desktop scenarios are typically based on mouse navigation, using a flying, walking or driving metaphor. Steering all six degrees of freedom in this 39 way is a complicated task even for a trained user. We propose an innovative object-centered concept for navigation, which allows exploring an unknown environment by directly going to the objects one desires looking at closely. The user specifies the object by its name, e.g. table , an aspect, e.g. front and a distance level, e.g. near in an intuitive fashion and is immediately transferred to the desired look-at point. This is done by pointing to an object with the mouse or using a simple speech recognition approach. The object-centered viewpoints are computed dynamically and need not be predefined. Our new navigation concept has been approved by different users and has been tested in an interactive construction environment.

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Klein, Reinhard; May, Thorsten; Schneider, Sascha; Weber, Andreas

Real-Time Fluid Animation by Parallel and Stable Solution Techniques

2001

Schilling, Andreas (Ed.): Festschrift zum 60. Geburtstag von Wolfgang Straßer : WSI / Wilhelm Schickard-Institut für Informatik: Sonderheft. Tübingen: Wilhelm-Schickard-Institut für Informatik, 2001, pp. 91-107

We describe new techniques for the parallelization of an unconditional stable solution scheme of the Navier-Stokes equation that has recently been introduced for animation purposes. The parallel improvement over existing schemes eleminates the sequential bottleneck. Aditionally our solution method makes use of time steps which are bigger than the framerate for interpolation between them. We achieve real-time animation rates foe several examples on current multi-processor workstations and PC's.

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Bryborn, Matthias; Klein, Reinhard; May, Thorsten; Schneider, Sascha; Weber, Andreas

A Portable, Parallel, Real-Time Animation-System for Turbulent Fluids

2000

Guizani, M. (Ed.) et al.: Parallel and Distributed Computing and Systems. Proceedings of the IASTED International Conference. Anaheim: IASTED/ACTA Press, 2000, pp. 394-400

IASTED International Conference on Parallel and Distributed Computing Systems <2000, Las Vegas, NV, USA>

We describe our parallelization of an unconditionally stable solution scheme of the Navier-Stokes equation that has recentlybeen used for animation purposes. Our parallelization gives good speed-ups on current multi-processor workstations. These speed-ups close the gap that existed towards real time animation for several 3D-examples. In addition to parallelizing the solver software the integration of a fast 3D-volume renderer into the parallel framework has been an important step to achieve this goal. Our parallelization is portable on workstations and PC s running under the UNIX or the WIN32 operating systems.

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Encarnação, José L.; Straßer, Wolfgang; Klein, Reinhard

Graphische Datenverarbeitung II. Modellierung komplexer Objekte und photorealistische Bilderzeugung

1997

München; Wien : Oldenbourg, 1997

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Encarnação, José L.; Straßer, Wolfgang; Klein, Reinhard

Graphische Datenverarbeitung I. Gerätetechnik, Programmierung und Anwendung graphischer Systeme

1996

München; Wien : Oldenbourg, 1996