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Proceedings of the 2025 Symposium on Eye Tracking Research and Applications

作者： Beryl Gnanaraj Swetha Manivasagam Jaya Sreevalsan-Nair Graphics-Visualization-Computing Lab International Institute of Information Technology Bangalore Bangalore Karnataka India Department of Computer Science and Engineering PSG College of Technology Coimbatore Tamil Nadu India

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The role of saturated thermal conduction in shaping electric current dynamics in jet-launching disks

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Journal of High Energy Astrophysics 2025年 47卷

作者： Rezgui, Ghassen Preiner, Reinhold Department of Physics Faculty of Sciences of Tunis University of Tunis El Manar Campus Universitaire Tunis El Manar 2092 Tunisia Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Inffeldgasse 16c Graz A-8010 Austria

This study investigates the dynamics of jet formation from a viscous, resistive accretion disk around a young stellar object using MHD simulations with the PLUTO code. We conducted an in-depth analysis of electric currents from various perspectives to elucidate how their dynamics, influenced by saturated thermal conduction, impact jet acceleration and collimation processes. Our simulations confirm the butterfly topology of electric current lines, as predicted by earlier analytic models. Crucially, increasing the saturation parameter ϕ_s alters the current line topology: higher saturation enhances collimation in the inner disk regions while inducing decollimation in the outer regions. By the end of our simulations (t=700, ∼112 rotational periods), higher ϕ_s results in a faster and more collimated jet compared to its lower ϕ_s counterpart, whereas at earlier times (t=200, ∼32 rotational periods), the jet exhibits lower acceleration despite enhanced collimation. In our reference case, we find that the electric current lines connect the launching region to the Alfvén and fast magnetosonic surfaces from early times, confirming the effectiveness of the acceleration mechanism at the onset of jet formation. Our study reveals that the upper jet regions are transitioning toward Kelvin–Helmholtz instability (KHI), while the jet base continues to exhibit wave activity. At t=700, doubling the saturation parameter reduces these oscillations and suppresses KHI, indicating faster plasma propagation. Analysis of the vertical profile of the current density, J_z, shows a clear correlation between increased saturation and both enhanced jet acceleration and current density. Furthermore, the ratio of electric currents at the Alfvén point, I_A, and sub-magnetosonic point, I_sm, indicates that higher saturation significantly improves the efficiency of matter propulsion and energy transfer within the jet. © 2025 Elsevier B.V.

关键词： Electric current Jet dynamics Magnetohydrodynamics simulations Saturated thermal conduction Young stellar objects

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Compressed progressive meshes (vol 6, pg 79, 2000)

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IEEE TRANSACTIONS ON visualization AND computer graphics 2000年第2期6卷 190-192页

作者： Pajarola, R Rossignac, J Information and Computer Science Department University of California Irvine Graphics Visualization and Usablity Center Georgia Institute of Technology

Most systems that support visual interaction with 3D models use shape representations based on triangle meshes. The size of these representations imposes limits on applications for which complex 3D models must be accessed remotely. Techniques for simplifying and compressing 3D models reduce the transmission time. Multiresolution formats provide quick access to a crude model and then refine it progressively. Unfortunately, compared to the best nonprogressive compression methods, previously proposed progressive refinement techniques impose a significant overhead when the full resolution model must be downloaded. The CPM (Compressed Progressive Meshes) approach proposed here eliminates this overhead. It uses a new technique, which refines the topology of the mesh in batches, which each increase the number of vertices by up to 50 percent. Less than an amortized total of 4 bits per triangle encode where and how the topological refinements should be applied. We estimate the position of new vertices from the positions of their topological neighbors in the less refined mesh using a new estimator that leads to representations of vertex coordinates that are 50 percent more compact than previously reported progressive geometry compression techniques.

关键词： Triangle mesh compression Progressive Meshes Multiresolution Modeling Geometry Compression

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VIRTUAL-REALITY ARTHROSCOPY TRAINING SIMULATOR

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computerS IN BIOLOGY AND MEDICINE 1995年第2期25卷 193-+页

作者： ZIEGLER, R FISCHER, G MULLER, W GOBEL, M Fraunhofer Institute for Computer Graphics Department of Visualization and Simulation Wilhelminenstr. 7 D-64283 Darmstadt Germany

This paper describes the result of the interdisciplinary cooperation of traumatologists of the Berufsgenossenschaftliche Unfallklinik (BGU) in Frankfurt am Main and a team of computer graphics scientists of the Fraunhofer institute for computer graphics in Darmstadt. We have developed a highly interactive training simulator system by means of computer graphics and virtual reality techniques.

关键词： VIRTUAL REALITY (VR) IN MEDICINE VR TRAINING SIMULATOR computer graphics IN MEDICINE ARTHROSCOPY TRAINING SIMULATOR

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VR techniques for the investigation of molecule data

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computerS & graphics 1996年第2期20卷 207-217页

作者： Haase, H Strassner, J Dai, F Department of Visualization and Simulation Fraunhofer Institute for Computer Graphics (Fraunhofer IGD) Wilhelminenstr. 7 D-64283 Darmstadt Germany

This paper describes a system for investigating molecule data. By means of combined Virtual Environment and Scientific visualization techniques it allows for immersive exploration of individual molecules as well as for investigation of docking behaviour between two molecules. Special emphasis is put on good interaction (simultaneous operation of two input devices with 6 degrees of freedom each, virtual menus), on fast rendering of large molecules in high quality (level of detail, fast rendering of spheres, utilization of multiple rendering pipelines, sorted triangle strips for transparent surfaces), and on other perceptual issues (e.g. judgement of position and size of molecules by shadows). The techniques which were realized for this system may also be used in other applications like assembly tasks, virtual material testing, etc. (C) 1996 Elsevier Science Ltd

关键词： Virtual reality

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End-to-end Color 3D reproduction of cultural heritage artifacts: Roseninsel replicas

End-to-end Color 3D reproduction of cultural heritage artifa...

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2019 Eurographics Workshop on graphics and Cultural Heritage, GCH 2019

作者： Domajnko, M. Tanksale, T. Tausch, R. Ritz, M. Knuth, M. Santos, P. Fellner, D.W. TU Darmstadt and Fraunhofer Institute for Computer Graphics Research Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038680826

Planning exhibitions of cultural artifacts is always challenging. Artifacts can be very sensitive to the environment and therefore their display can be risky. One way to circumvent this is to build replicas of these artifacts. Here, 3D digitization and reproduction, either physical via 3D printing or virtual, using computer graphics, can be the method of choice. For this use case we present a workflow, from photogrammetric acquisition in challenging environments to representation of the acquired 3D models in different ways, such as online visualization and color 3D printed replicas. This work can also be seen as a first step towards establishing a workflow for full color end-to-end reproduction of artifacts. Our workflow was applied on cultural artifacts found around the "Roseninsel" (Rose Island), an island in Lake Starnberg (Bavaria), in collaboration with the Bavarian State Archaeological Collection in Munich. We demonstrate the results of the end-to-end reproduction workflow leading to virtual replicas (online 3D visualization, virtual and augmented reality) and physical replicas (3D printed objects). In addition, we discuss potential optimizations and briefly present an improved state-of-the-art 3D digitization system for fully autonomous acquisition of geometry and colors of cultural heritage objects. © 2019 Eurographics Association.

关键词： Color

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Automated 3D mass digitization for the GLAM sector

Automated 3D mass digitization for the GLAM sector

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Archiving 2020 Online: Digitization, Preservation, and Access

作者： Santos, Pedro Tausch, Reimar Domajnko, Matevz Ritz, Martin Knuth, Martin Fellner, Dieter Fraunhofer Institute for Computer Graphics Research TU-Darmstadt Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

The European Cultural Heritage Strategy for the 21st century has led to an increased demand for fast, efficient and faithful 3D digitization technologies for cultural heritage artefacts. Yet, unlike the digital acquisition of cultural goods in 2D which is widely used and automated today, 3D digitization often still requires significant manual intervention, time and money. To overcome this, the authors have developed CultLab3D, the world's first fully automatic 3D mass digitization technology for collections of three-dimensional objects. 3D scanning robots such as the CultArm3D-P are specifically designed to automate the entire 3D digitization process thus allowing to capture and archive objects on a large-scale and produce highly accurate photo-realistic representations. © 2020 Society for Imaging Science and Technology

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Efficient finite element methods for deformable bodies in medical applications

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Critical Reviews in Biomedical Engineering 2012年第2期40卷 155-172页

作者： Georgii, Joachim Dick, Christian Fraunhofer MEVIS Institute for Medical Image Computing Bremen Germany Computer Graphics and Visualization Group Technische Universität München Germany

Simulation techniques for deformable bodies are of major relevance for a broad range of medical applications. In recent decades, a lot of work has been performed to improve simulation methods, allowing interactivity or even real time. However, this work often focused on applications such as computer games or virtual environments, where physical accuracy is not a primary goal. The goal of this report is to give an overview of efficient physics-based techniques for deformable objects, focusing on finite element methods, and to discuss the applicability of these techniques in medical scenarios. As a result, we focus on techniques that are amenable to simulating highly resolved meshes, which for instance can be generated from computed tomography (CT) or magnetic resonance (MR) images, and we review the so-called corotated finite element method that has shown a high potential in recent years. Specifically, we will capture in detail the related work in this field and demonstrate the current state of the art in efficient deformable bodies simulations. © 2012 Begell House, Inc.

关键词： Medical applications

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A repository for 3D model production and interpretation in culture and beyond 11

A repository for 3D model production and interpretation in c...

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11th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage, VAST 2010

作者： Doerr, M. Tzompanaki, K. Theodoridou, M. Georgis, Ch. Axaridou, A. Havemann, S. Institute of Computer Science FORTH Crete Greece Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria

ISBN: (纸本)9783905674293

In order to support the work of researchers in the production, processing and interpretation of complex digital objects and the dissemination of valuable and diverse information to a broad spectrum of audience there is need for an integrated high performance environment that will combine knowledge base features with content management and information retrieval (IR) technologies. In this paper we describe the design and implementation of an integrated repository to ingest, store, manipulate, and export 3D Models, their related digital objects and metadata and to enable efficient access, use, reuse and preservation of the information, ensuring referential and semantic integrity. The repository design is based on an integrated coherent conceptual schema that models complex metadata regarding provenance information, structured models, formats, compatibility of 3D models, historical events and real world objects. This repository is not implemented just to be a storage location for digital objects;it is meant to be a working integrated platform for distant users who participate in a process chain consisting of several steps. A first prototype, in the field of Cultural Heritage, has already been implemented in the context of 3D-COFORM project, an integrated research project funded by the European Community's Seventh Framework Programme (FP7/2007-2013, no 231809) and the results are satisfactory, proving the feasibility of the design decisions which are absolutely new, ambitious, and extraordinarily generic for e-science. © The Eurographics Association 2010.

关键词： Metadata

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Bridging the Distance in Education: Design and Implementation of a Synchronous, Browser-Based VR Remote Teaching Tool

Bridging the Distance in Education: Design and Implementatio...

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45th Annual Conference on European Association for computer graphics, EUROgraphics 2024

作者： Pehlić, Abdulmelik Augsdörfer, Ursula Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038682387

The rapid shift to remote education has presented numerous challenges for educators and students alike. Virtual Reality (VR) has emerged as a promising solution, offering immersive and interactive learning experiences. We design and implement a synchronous, browser-based VR teaching tool. The tool is compatible with budget VR equipment and enables meaningful engagement between teachers and students in a virtual setting, as well as active participation and interaction across a range of platforms, thus solving a range of disadvantages of current approaches. © 2024 The Authors.

关键词： Virtual environments

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