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

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

引用

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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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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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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Shape-based transfer functions for volume visualization

Shape-based transfer functions for volume visualization

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Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Jörg-Stefan Praßni Timo Ropinski Jörg Mensmann Klaus Hinrichs Westfalische Wilhelms-Universitat Munster Munster Nordrhein-Westfalen DE Visualization and Computer Graphics Research Group (VisCG) University of Münster Germany

ISBN: (纸本)9781424466856

We present a novel classification technique for volume visualization that takes the shape of volumetric features into account. The presented technique enables the user to distinguish features based on their 3D shape and to assign individual optical properties to these. Based on a rough pre-segmentation that can be done by windowing, we exploit the curve-skeleton of each volumetric structure in order to derive a shape descriptor similar to those used in current shape recognition algorithms. The shape descriptor distinguishes three main shape classes: longitudinal, surface-like, and blobby shapes. In contrast to previous approaches, the classification is not performed on a per-voxel level but assigns a uniform shape descriptor to each feature and therefore allows a more intuitive user interface for the assignment of optical properties. By using the proposed technique, it becomes for instance possible to distinguish blobby heart structures filled with contrast agents from potentially occluding vessels and rib bones. After introducing the basic concepts, we show how the presented technique performs on real world data, and we discuss current limitations.

关键词： Transfer functions visualization Shape User interfaces computer graphics Bones Multidimensional systems Rough surfaces Surface roughness Heart

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Synchronizing user interactions with multiple parametrized three-dimensional web graphics

Synchronizing user interactions with multiple parametrized t...

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4th International Conference on computer graphics Theory and Applications, GRAPP 2009

作者： Kraus, Martin Computer Graphics and Visualization Group Technische Universität München Boltzmannstrafie 3 85748 Garching Germany

ISBN: (纸本)9789898111678

The synchronization of a single user's interactions with multiple parametrized graphics in a single web page is an important and povverful feature of interactive illustrations. In this work we present an interface to specifv this kind of svnchronization and its implementation in a Java applet for rendering and interacting with three-dimensional web graphics. Our design allovvs authors of web pages to svnchronize the parameters of groups of interactive graphics vvithin a web page by specifying identical text labels for all applets of the same group. Further labels may be specified to svnchronize changes of the vievvpoints and/or of the magnification. This design allovvs for multiple, independently svnchronized groups of graphics on the same web page as well as any combination of svnchronized parameters, vievvpoints and magnification factors. Only three additional applet parameters are necessary, vvhich are not restricted by any syntax.

关键词： Websites

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The pull-push algorithm revisited: Improvements,computation of point densities,and GPU implementation

The pull-push algorithm revisited: Improvements,computation ...

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4th International Conference on computer graphics Theory and Applications, GRAPP 2009

作者： Kraus, Martin Computer Graphics and Visualization Group Technische Universität München Boltzmannstrae 3 85748 Garching Germany

ISBN: (纸本)9789898111678

The pull-push algorithm is a well-known and very efficient pyramid algorithm for the interpolation of scattered data with many applications in computer ***,the original algorithm is not very well suited for an implementation on GPUs (graphics processing units).In this work,several improvements of the algorithm are presented to overcome this limitalion,and important details of the algorithm are clarified,in particular the importance of the correct normalization of the employed ***,we present an extension for a very efficient estimate of the local density of sample points.

关键词： graphics processing unit

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Transitional environments enhance distance perception in immersive virtual reality systems 09

Transitional environments enhance distance perception in imm...

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APGV 2009: Symposium on Applied Perception in graphics and visualization

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Lappe, Markus Ries, Brian Interrante, Victoria Visualization and Computer Graphics Research Group Germany Psychology Department II University of Münster Germany Department of Computer Science and Engineering University of Minnesota United States

ISBN: (纸本)9781605587431

Several experiments have provided evidence that ego-centric distances are perceived as compressed in immersive virtual environments relative to the real world. The principal factors responsible for this phenomenon have remained largely unknown. However, recent experiments suggest that when the virtual environment (VE) is an exact replica of a user's real physical surroundings, the person's distance perception improves. Furthermore, it has been shown that when users start their virtual reality (VR) experience in such a virtual replica and then gradually transition to a different VE, their sense of presence in the actual virtual world increases significantly. In this case the virtual replica serves as a transitional environment between the real and virtual world. In this paper we examine whether a person's distance estimation skills can be transferred from a transitional environment to a different VE. We have conducted blind walking experiments to analyze if starting the VR experience in a transitional environment can improve a person's ability to estimate distances in an immersive VR system. We found that users significantly improve their distance estimation skills when they enter the virtual world via a transitional environment. © 2009 ACM.

关键词： Virtual reality

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Presence-enhancing real walking user interface for first-person video games

Presence-enhancing real walking user interface for first-per...

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2009 ACM SIGGRAPH Symposium on Video Games, Sandbox '09

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Steed, Anthony Visualization and Computer Graphics Research Group Department of Computer Science University of Munster Einsteinstraße 62 48149 Munster Germany Virtual Environments and Computer Graphics Group Department of Computer Science University College London Gower Street London WC1E 6BT United Kingdom

ISBN: (纸本)9781605585147

For most first-person video games it is important that players have a high level of feeling presence in the displayed game environment. Virtual reality (VR) technologies have enormous potential to enhance gameplay since players can experience the game immersively from the perspective of the player's virtual character. However, the VR technology itself, such as tracking devices and cabling, has until recently restricted the ability of users to really walk over long distances. In this paper we introduce a VR-based user interface for presence-enhancing gameplay with which players can explore the game environment in the most natural way, i. e., by real walking. While the player walks through the virtual game environment, we guide him/her on a physical path which is different from the virtual path and fits into the VR laboratory space. In order to further increase the VR experience, we introduce the concept of transitional environments. Such a transitional environment is a virtual replica of the laboratory environment, where the VR experience starts and which enables a gradual transition to the game environment. We have quantified how much humans can unknowingly be redirected and whether or not a gradual transition to a first-person game via a transitional environment increases the user's sense of presence. © 2009 ACM.

关键词： Virtual reality

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Advanced illumination techniques for GPU-based volume raycasting 09

Advanced illumination techniques for GPU-based volume raycas...

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ACM SIGGRAPH 2009 Courses, SIGGRAPH '09

作者： Hadwiger, Markus Ljung, Patric Salama, Christof Rezk Ropinski, Timo VRVis Research Center for Virtual Reality and Visualization Donau-City-Straße 1 A-1220 Vienna Austria Siemens Corporate Research Imaging and Visualization Department 755 College Road East Princeton NJ 08540 United States Computer Graphics Group University of Siegen Hölderlinstr. 3 57068 Siegen Germany Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Münster Germany

ISBN: (纸本)9781450379380

Volume raycasting techniques are important for both visual arts and visualization. They allow efficient generation of visual effects and visualization of scientific data obtained by tomography or numerical simulation. Volume-rendering techniques are also effective for direct rendering of implicit surfaces used for soft-body animation and constructive solid geometry. The focus of this course is on volumetric illumination techniques that approximate physically based light transport in participating media. Such techniques include interactive implementation of soft and hard shadows, ambient occlusion, and simple Monte Carlo-based approaches to global illumination, including translucency and scattering.

关键词： visualization

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