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Taxonomy and Implementation of Redirection Techniques for Ubiquitous Passive Haptic Feedback

Taxonomy and Implementation of Redirection Techniques for Ub...

引用

International Conference on Cyberworlds

作者： Frank Steinicke Gerd Bruder Luv Kohli Jason Jerald Klaus Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science Westfälische Wilhelms-Universität Münster Germany Effective Virtual Environments (EVE) Group Department of Computer Science University of North Carolina Chapel Hill USA

Traveling through immersive virtual environments (IVEs) by means of real walking is an important activity to increase naturalness of VR-based interaction. However, the size of the virtual world often exceeds the size of the tracked space so that a straightforward implementation of omni-directional and unlimited walking is not possible. Redirected walking is one concept to solve this problem of walking in IVEs by inconspicuously guiding the user on a physical path that may differ from the path the user visually perceives. When the user approaches a virtual object she can be redirected to a real proxy object that is registered to the virtual counterpart and provides passive haptic feedback. In such passive haptic environments, any number of virtual objects can be mapped to proxy objects having similar haptic properties, e.g., size, shape and texture. The user can sense a virtual object by touching its real world counterpart. Redirecting a user to a registered proxy object makes it necessary to predict the user's intended position in the IVE. Based on this target position we determine a path through the physical space such that the user is guided to the registered proxy object. We present a taxonomy of possible redirection techniques that enable user guidance such that inconsistencies between visual and proprioceptive stimuli are imperceptible. We describe how a user's target in the virtual world can be predicted reliably and how a corresponding real-world path to the registered proxy object can be derived.

关键词： Taxonomy Haptic interfaces Feedback Legged locomotion Virtual environment Space exploration computer science Navigation Large-scale systems graphics

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Interactive Visual Exploration of Unsteady 3D Flows

Interactive Visual Exploration of Unsteady 3D Flows

引用

9th Joint Eurographics/IEEE VGTC Symposium on visualization, EuroVis 2007

作者： Bürger, K. Schneider, J. Kondratieva, P. Krüger, J. Westermann, R. Computer Graphics and Visualization Group Technische Universität München Germany

ISBN: (纸本)9783905673456

In this paper we present GPU-based techniques for the interactive visualization of large unsteady 3D flow fields on uniform grids. We propose a novel dual-core approach to asynchronously stream such fields from the CPU, thus enabling the efficient exploration of large time-resolved sequences. This approach decouples visualization from data handling, resulting in interactive frame rates. Built upon a previously published GPU particle engine for flow visualization we have developed new strategies to compute and to visualize path lines and streak lines on the GPU. To provide additional visual cues, focus+context techniques for polygonal meshes have been integrated. The proposed techniques are used in the visual analysis of the Terashake 2.1 earthquake simulation data, and they have been shown to be very effective in revealing the relevant information in this data. © The Eurographics Association 2007.

关键词： Engines

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Interactive GPU-based collision detection

Interactive GPU-based collision detection

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2007 IADIS International Conference on computer graphics and visualization, CGV 2007, part of the 1st IADIS Multi Conference on computer Science and Information Systems, MCCSIS 2007

作者： Georgii, Joachim Krüger, Jens Westermann, Rüdiger Computer Graphics & Visualization Group Technische Universität München Boltzmannstr. 3 Garching85748 Germany

ISBN: (纸本)9789728924393

If two closed polygonal objects with outfacing normals intersect each other there exist one or more lines that intersect these objects at at least two consecutive front or back facing object points. In this work we present a method to efficiently detect these lines using depth-peeling and simple fragment operations. Of all polygons only those having an intersection with any of these lines are potentially colliding. Polygons not intersected by the same line do not intersect each other. We describe how to find all potentially colliding polygons and the potentially colliding pairs using a mipmap hierarchy that represents line bundles at ever increasing width. To download only potentially colliding polygons to the CPU for polygon-polygon intersection testing we have developed a general method to convert a sparse texture into a packed texture of reduced size. Our method exploits the intrinsic strength of GPUs to scan convert large sets of polygons and to shade billions of fragments at interactive rates. It neither requires a bounding volume hierarchy nor a pre-processing stage, so it can efficiently deal with very large and deforming polygonal models. The particular design makes the method suitable for applications where geometry is modified or even created on the GPU. © 2007 IADIS.

关键词： graphics processing unit

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1 Course description

1 Course description

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ACM SIGGRAPH 2007 - International Conference on computer graphics and Interactive Techniques

作者： Kasik, Dave Gobbetti, Enrico Marton, Fabio Manocha, Dinesh Yoon, Sung-Eui Correa, Wagner Bruderlin, Beat Stephens, Abe Slusallek, Philipp Dietrich, Andreas Quilez, Iñigo Boeing Enterprise Visualization China Italy Department of Computer Science University of North Carolina Chapel Hill United States Lawrence Livermore National Laboratory United States Visualization Systems Group United States United States Department of Computer Science Technical University of Ilmenau Germany University of Utah's SCI Institute United States Department of Computer Graphics and Digital Media Saarland University Germany Computer Graphics Group Saarland University Germany

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Precise Registration of 3D Models To Images by Swarming Particles

Precise Registration of 3D Models To Images by Swarming Part...

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Conference on computer Vision and Pattern Recognition (CVPR)

作者： Joerg Liebelt Klaus Schertler Computer Graphics & Visualization Group Technical University Munich Munich Germany Department IW-SI EADS Innovation Works Germany Munich Germany

The precise alignment of a 3D model to 2D sensor images to recover the pose of an object in a scene is an important topic in computer vision. In this work, we outline a registration scheme to align arbitrary standard 3D models to optical and synthetic aperture radar (SAR) images in order to recover the full 6 degrees of freedom of the object. We propose a novel similarity measure which combines perspective contour matching and an appearance-based Mutual information (MI) measure. Unlike previous work, the resulting similarity measure is optimized using an evolutionary particle swarming strategy, parallelized to exploit the hardware acceleration potential of current generation graphics processors (GPUs). The performance of our registration scheme is systematically evaluated on an object tracking task using synthetic as well as real input images. We show that our approach leads to precise registration results, even for significant image noise, small object dimensions and partial occlusion where other methods would fail.

关键词： Image sensors Layout computer vision Adaptive optics Laser radar Optical sensors Synthetic aperture radar Mutual information Current measurement Particle measurements

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Visualizing the Phonon Map

Visualizing the Phonon Map

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8th Joint Eurographics/IEEE VGTC Symposium on visualization, EuroVis 2006

作者： Deines, E. Michel, F. Bertram, M. Hagen, H. Nielson, G.M. Kaiserslautern Germany Kaiserslautern Germany Computer Graphics and Visualization Group University of Kaiserslautern Germany Arizona State University United States

ISBN: (纸本)3905673312

In this work we present several visualization approaches for analyzing acoustic behavior inside a room. Our methods are based on the results of the phonon tracing algorithm. For a simulated phonon map we examine the influence of the room surfaces on the wave fronts during their propagation from the sound source. Our visualization is based on individual phonon and surface representations as well as scattered data interpolation. Additionally, an observation of acoustic behavior at different positions inside the room using colored and deformed spheres is possible. © The Eurographics Association 2006.

关键词： visualization

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Topology- and Feature-based Flow visualization: Methods and Applications 1

Topology- and Feature-based Flow Visualization: Methods and ...

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1st Workshop of the DFG's International Research Training group "visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling, and Engineering"

作者： Garth, Christoph Tricoche, Xavier Computer Graphics & Visualization Group University of Kaiserslautern Kaiserslautern Germany Scientific Computing & Imaging Insitute University of Utah Salt Lake CityUT United States

ISBN: (纸本)9783885794387

In this paper we give a survey on topology- and feature-based flow visualization methods. After an introduction into the respective methodologies and a basic classification of techniques, we will focus on practical aspects and several application examples from different areas of flow physics. We show the utility and importance of these classes of tools in the design and analysis of technical flows. © 2006 Gesellschaft für Informatik, Bonn.

关键词： Flow visualization

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GPU-friendly high-quality terrain rendering

GPU-friendly high-quality terrain rendering

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14th International Conference in Central Europe on computer graphics, visualization and computer Vision 2006, WSCG'2006 - In Co-operation with EUROgraphics

作者： Schneider, Jens Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universitä München Lehrstuhl I15 Boltzmannstraße 3 D-85748 Garching bei München Germany

ISBN: (纸本)8086943038

We present a LOD rendering technique for large, textured terrain, which is well-suited for recent GPUs. In a preprocess, we tile the domain, and we compute for each tile a discrete set of LODs using a nested mesh hierarchy. This hierarchy can be encoded progressively. At run time, continuous LODs can simply be generated by interpolation of per-vertex height values on the GPU. Any mesh re-triangulation at run-time is avoided. Because the number of triangles in the mesh hierarchy is substantially decimated and by progressive transmission of vertices, our approach significantly reduces bandwidth requirements. During a typical fly-over we can guarantee extremely small pixel errors at very high frame rates. Copyright © UNION Agency - Science Press.

关键词： Data transfer

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Preface

Mathematics and Visualization

引用

Mathematics and visualization 2006年 V-VIII页

作者： Weickert, Joachim Hagen, Hans Faculty of Mathematics and Computer Science Saarland University Building 27 Saarbrücken66041 Germany Computer Graphics and Visualization Group Technical University of Kaiserslautern PO Box 3049 Kaiserslautern67653 Germany

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Linear algebra operators for GPU implementation of numerical algorithms 05

Linear algebra operators for GPU implementation of numerical...

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ACM SIGGRAPH 2005 International Conference on computer graphics and Interactive Techniques, SIGGRAPH 2005

作者： Krüger, Jens Westermann, Rüdiger Computer Graphics and Visualization Group Technical University Munich Germany

ISBN: (纸本)9781450378338

In this work, the emphasis is on the development of strategies to realize techniques of numerical computing on the graphics chip. In particular, the focus is on the acceleration of techniques for solving sets of algebraic equations as they occur in numerical simulation. We introduce a framework for the implementation of linear algebra operators on programmable graphics processors (GPUS), thus providing the building blocks for the design of more complex numerical algorithms. In particular, we propose a stream model for arithmetic operations on vectors and matrices that exploits the intrinsic parallelism and efficient communication on modern GPUS. Besides performance gains due to improved numerical computations, graphics algorithms benefit from this model in that the transfer of computation results to the graphics processor for display is avoided. We demonstrate the effectiveness of our approach by implementing direct solvers for sparse matrices, and by applying these solvers to multi-dimensional finite difference equations, i.e. the 2D wave equation and the incompressible Navier-Stokes equations. © ACM, 2003.

关键词： Navier Stokes equations

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