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PROBADO3D - Indexing and searching 3D CAD databases supporting planning through content-based indexing and 3D shape retrieval 10

PROBADO3D - Indexing and searching 3D CAD databases supporti...

引用

10th International Conference on Design and Decision Support Systems, DDSS 2010

作者： Blümel, Ina Berndt, René Ochmann, Sebastian Vock, Richard Wessel, Raoul German National Library of Science and Technology Hannover Germany Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria Institute of Computer Science II Computer Graphics University of Bonn Germany

ISBN: (纸本)9789068141818

When modeling in 3D CAD, architects often search for already existing 3D content to complete their own design, e.g. environmental models, furniture models or detailed window profiles. 3D models are normally indexed and accessed based on textual metadata. As this metadata is expensive to obtain, PROBADO3D aims to develop workflows and tools for semi-automatic indexing of 3D models. Another goal is the development of intuitive visual search and presentation interfaces that face the needs of architects looking for 3D content. PROBADO3D is a part of the PROBADO framework designed to support multimedia objects of different domains.

关键词： Digital libraries

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Interactive deformations with multigrid skeletal constraints

Interactive deformations with multigrid skeletal constraints

引用

7th Workshop on Virtual Reality Interactions and Physical Simulations, VRIPHYS 2010

作者： Georgii, J. Lagler, D. Dick, C. Westermann, R. Computer Graphics and Visualization Group Technische Universität München Germany Fraunhofer MEVIS Bremen Germany

ISBN: (纸本)9783905673784

In this paper we present an interactive method for simulating deformable objects using skeletal constraints. We introduce a two-way coupling of a finite element model and a skeleton that is attached to this model. The skeleton pose is determined via inverse kinematics. The target positions of joints are either given by user interactions or forces imposed by the surrounding deformable body. The movement of the deformable body either follows the movement of the skeleton thereby respecting physical constraints imposed by the underlying deformation model, or the movement is determined from user-defined external forces. Due to the proposed two-way coupling, the skeleton and the deformable body constrain each other's movement, thus allowing for an intuitive and realistic animation of soft bodies. To realize the two-way coupling we propose the efficient embedding of the constraints into a geometric multigrid scheme to solve the governing equations of deformable body motion. We present a greedy approach that propagates the constraints to coarser hierarchy levels, and we show that this approach can significantly improve the convergence rate of the multigrid solver. © The Eurographics Association 2010.

关键词： Inverse kinematics

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Augmentation techniques for efficient exploration in head-mounted display environments 10

Augmentation techniques for efficient exploration in head-mo...

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Proceedings of the 17th ACM Symposium on Virtual Reality Software and Technology

作者： Bolte, Benjamin Bruder, Gerd Steinicke, Frank Hinrichs, Klaus Lappe, Markus Visualization and Computer Graphics Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany

ISBN: (纸本)9781450304412

Physical characteristics and constraints of today's head-mounted displays (HMDs) often impair interaction in immersive virtual environments (VEs). For instance, due to the limited field of view (FOV) subtended by the display units in front of the user's eyes more effort is required to explore a VE by head rotations than for exploration in the real world. In this paper we propose a combination of two augmentation techniques that have the potential to make exploration of VEs more efficient: (1) augmenting the geometric FOV (GFOV) used for rendering the VE, and (2) amplifying head rotations while the user changes her head orientation. In order to identify how much manipulation can be applied without users noticing, we conducted two psychophysical experiments in which we analyzed subjects' ability to discriminate between virtual and real head pitch and roll rotations while three different geometric FOVs were used. Our results show that the combination of both techniques has great potential to support efficient exploration of VEs. We found that virtual pitch and roll rotations can be amplified by 30% and 44% respectively, when the GFOV matches the subject's estimation of the most natural FOV. This leads to a possible reduction of the user's effort required to explore the VE using a combination of both techniques by approximately 25%. Copyright © 2010 by the Association for Computing Machinery, Inc.

关键词： Virtual reality

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Interaction analysis: An algorithm for interaction prediction and activity recognition in adaptive systems

Interaction analysis: An algorithm for interaction predictio...

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2010 IEEE International Conference on Intelligent Computing and Intelligent Systems, ICIS 2010

作者： Nazemi, Kawa Stab, Christian Fellner, Dieter W. 3D Knowledge Worlds and Semantics Visualization Fraunhofer Institute for Computer Graphics Research 64283 Darmstadt Germany

ISBN: (纸本)9781424465835

Predictive statistical models are used in the area of adaptive user interfaces to model user behavior and to infer user information from interaction events in an implicit and non-intrusive way. This information constitutes the basis for tailoring the user interface to the needs of the individual user. Consequently, the user analysis process should model the user with information, which can be used in various systems to recognize user activities, intentions and roles to accomplish an adequate adaptation to the given user and his current task. In this paper we present the improved prediction algorithm KO*/19, which is able to recognize, beside interaction predictions, behavioral patterns for recognizing user activities. By means of this extension, the evaluation shows that the KO*/19-Algorithm improves the Mean Prediction Rank more than 19% compared to other well-established prediction algorithms. ©2010 IEEE.

关键词： User interfaces

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GPU-aware hybrid terrain rendering

GPU-aware hybrid terrain rendering

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作者： Dick, Christian Krüger, Jens Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universität München Germany Interactive Visualization and Data Analysis Group DFKI Saarbrücken Germany

ISBN: (纸本)9789728939229

We present a hybrid GPU rendering pipeline for high-resolution textured terrain fields that reduces polygon throughput limitations on the GPU. This pipeline uses rasterization and ray-casting in every frame simultaneously to determine eye ray intersections. It allows shifting workloads flexibly between the triangle setup stage and the parallel execution units, depending on the GPU capacities. We employ a hierarchical tiling of the domain and generate for each tile an errorcontrolled adaptive tessellation of the terrain. In each rendering frame, for each tile the number of triangles representing this tile as well as the number of pixels covered by the tile are determined, and this information is used to select the fastest rendering method on the executing GPU. Compared to pure rasterization or ray-casting, performance gains of a factor between 2 and 4 are demonstrated for high-resolution fields. © 2010 IADIS.

关键词： Rasterization

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A distributed object repository for cultural heritage 11

A distributed object repository for cultural heritage

引用

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

作者： Pan, X. Beckmann, P. Havemann, S. Tzompanaki, K. Doerr, M. Fellner, D.W. Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria Institute of Computer Science FORTH Crete Greece TU Darmstadt Fraunhofer IGD Germany

ISBN: (纸本)9783905674293

This paper describes the design and the implementation of a distributed object repository that offers cultural heritage experts and practitioners a working platform to access, use, share and modify digital content. The principle of collecting paradata to document each step in a potentially long sequence of processing steps implies a number of design decisions for the data repository, which are described and explained. Furthermore, we provide a description of the concise API our implementation. Our intention is to provide an easy-to-understand recipe that may be valuable also for other data repository implementations that incorporate and operationalize the more theoretical concepts of intellectual transparency, collecting paradata, and compatibility to semantic networks. © The Eurographics Association 2010.

关键词： Semantics

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Interaction Analysis: An Algorithm for Interaction Prediction and Activity Recognition in Adaptive Systems

Interaction Analysis: An Algorithm for Interaction Predictio...

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2010 IEEE International Conference on Intelligent Computing and Intelligent Systems(2010 IEEE 智能计算与智能系统国际会议 ICIS 2010)

作者： Christian Stab Kawa Nazemi Dieter W.Fellner 3D Knowledge Worlds and Semantics Visualization Fraunhofer Institute for Computer Graphics Research 3D Knowledge Worlds and Semantics Visualization Fraunhofer Institute for Computer Graphics Research

Predictive statistical models are used in the area of adaptive user interfaces to model user behavior and to infer user information from interaction events in an implicit and non-intrusive way. This information constitutes the basis for tailoring the user interface to the needs of the individual user. Consequently, the user analysis process should model the user with information, which can be used in various systems to recognize user activities, intentions and roles to accomplish an adequate adaptation to the given user and his current task. In this paper we present the improved prediction algorithm KO*/19, which is able to recognize, beside interaction predictions, behavioral patterns for recognizing user activities. By means of this extension, the evaluation shows that the KO*/19Algorithm improves the Mean Prediction Rank more than 19％ compared to other well-established prediction algorithms.

关键词： Predictive Statistical Model Activity Recognition User Modeling Adaptive User Interfaces

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A multi-touch enabled human-transporter metaphor for virtual 3D traveling

A multi-touch enabled human-transporter metaphor for virtual...

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IEEE Symposium on 3D User Interfaces (3DUI)

作者： Dimitar Valkov Frank Steinicke Gerd Bruder Klaus Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science University of Münster Munster Germany

ISBN: (纸本)9781424468461;9781424468447

In this tech-note we demonstrate how multi-touch hand gestures in combination with foot gestures can be used to perform navigation tasks in interactive 3D environments. Geographic Information Systems (GIS) are well suited as a complex testbed for evaluation of user interfaces based on multi-modal input. Recent developments in the area of interactive surfaces enable the construction of low-cost multi-touch displays and relatively inexpensive sensor technology to detect foot gestures, which allows to explore these input modalities for virtual reality environments. In this tech-note, we describe an intuitive 3D user interface metaphor and corresponding hardware, which combine multi-touch hand and foot gestures for interaction with spatial data.

关键词： Navigation Foot Legged locomotion User interfaces Geographic Information Systems Virtual reality visualization computer graphics computer science System testing

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Immersive virtual studio for architectural exploration

Immersive virtual studio for architectural exploration

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IEEE Symposium on 3D User Interfaces (3DUI)

作者： Gerd Bruder Frank Steinicke Dimitar Valkov Klaus Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science University of Münster Munster Germany

ISBN: (纸本)9781424468461;9781424468447

Architects use a variety of analog and digital tools and media to plan and design constructions. Immersive virtual reality (VR) technologies have shown great potential for architectural design, especially for exploration and review of design proposals. In this work we propose a virtual studio system, which allows architects and clients to use arbitrary real-world tools such as maps or rulers during immersive exploration of virtual 3D models. The user interface allows architects and clients to review designs and compose 3D architectural scenes, combining benefits of mixed-reality environments with immersive head-mounted display setups.

关键词： Virtual reality User interfaces Layout Cameras computer graphics Legged locomotion Laboratories computer displays Three dimensional displays Process design

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Animating horse gaits and transitions

Animating horse gaits and transitions

引用

8th Theory and Practice of computer graphics Conference, TPCG 2010

作者： Murphy, J.E. Carr, H. O'Neill, M. Imaging Visualisation and Graphics Group School of Computer Science and Informatics University College Dublin Ireland Visualization and Virtual Reality Group School of Computing University of Leeds United Kingdom Natural Computing Research and Applications Group School of Computer Science and Informatics University College Dublin Ireland

ISBN: (纸本)9783905673753

Animations of horses are commonly used for entertainment purposes. A realistic animated model must move with a gait appropriate to its velocity. We present a kinematic animation system in which a horse model moves using gaits and transitions based on predictions from Dynamic Similarity theory. A Genetic Programming technique is used to evolve gait motion with dynamically adjustable limb extent. The system is controlled in real-time using a MIDI controller system based around the model's Froude number. We were successful in producing high quality animations of the horse's natural gaits and transitions. © The Eurographics Association 2010.

关键词： Genetic algorithms

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