7,978 Works

ViSTA FlowLib - A Framework for Interactive Visualization and Exploration of Unsteady Flows in Virtual Environments

M. Schirski, A. Gerndt, T. Van Reimersdahl, T. Kuhlen, P. Adomeit, O. Lang, S. Pischinger & C. Bischof
In the past a lot of work has been invested in various aspects of an interactive visualization of CFD simulation data. This includes e.g. increasing the rendering speed and responsiveness of complex visualizations, using and enhancing multimodal user interfaces, and incorporating parallel approaches for an efficient extraction of flow properties and their respective visual representation. Still, only few projects combine the significant advances in these areas. In this paper, we describe our software framework ViSTA...

Automated Testing of Virtual Reality Application Interfaces

Allen Bierbaum, Patrick Hartling & Carolina Cruz-Neira
We describe a technique for supporting testing of the interaction aspect of virtual reality (VR) applications. Testing is a fundamental development practice that forms the basis of many software engineering methodologies. It is used to ensure the correct behavior of applications. Currently, there is no common pattern for automated testing of VR application interaction. We review current software engineering practices used in testing and explore how they may be applied to the specific realm of...

A Panoramic Walkthrough System with Occlusion Culling

Lining Yang & Roger Crawfis
The interactive and high quality rendering of very complex scenes in a virtual environment is very difficult if not impossible to achieve. This research extends our previous EGVE paper that presents a panoramic walkthrough system, allowing the user to move inside the datasets on a pre-defined track and look around interactively in both the horizontal and vertical directions. The interactivity is achieved by using Image-Based Rendering ideas to pre-compute the partial renderings for the reference...

Haptic Rendering Techniques for the Interactive Exploration of CFD Datasets in Virtual Environments

T. Van Reimersdahl, F. Bley, T. Kuhlen & C.H. Bischof
In pure CFD visualization tools, some flow features are hard to visualize such as the properties of a local flow probe. Haptic rendering techniques offer an intuitive understanding and allow more detailed insights than the visual perception solely. In our application framework ViSTA FlowLib for the interactive visualization and exploration of unsteady flows in virtual environments we implemented haptic rendering techniques as an add-on feature for the commonly used visualization algorithms for scalar and vector...

A Survey and Performance Analysis of Software Platforms for Interactive Cluster-Based Multi-Screen Rendering

Oliver G. Staadt, Justin Walker, Christof Nuber & Bernd Hamann
We present a survey of different software architectures designed to render on a tiled display. We provide an in-depth analysis of three selected systems, including their implementation of data distribution, sort-first rendering, and overall usability. We use various test cases to analyze the performance of these three systems.

Interacting with real time simulations - virtual reality in industry applications

A. Jönsson, J. Bathelt & G. Broman
Modern manufacturing machines are highly multidisciplinary, and with demands on short time-to-market, product development based on traditional prototype testing has become impractical. By using virtual models, it is possible to test large numbers of variants and optimise the product with the aid of a minimum of physical prototypes. Due to the immense development of software and hardware for simulation and visualisation it should today be possible also for small and medium sized enterprises to use...

CAD/CAE visualization in virtual environment for automotive industry

D. Paillot, F. Merienne & S. Thivent
In this paper we propose a method to link CAD models to an immersive environment. Since CAD models can not be directly viewed in a real-time visualization environment, we present here a complete chain of adapta-tion steps to view adapted CAD models in an immersive environment with high quality rendering. Our method allows high quality visualization of complex scenes in an immersive environment such as design reviewing for example.

3D input devices and interaction concepts for optical tracking in immersive environments

Oliver Stefani & Jörg Rauschenbach
In this poster abstract we present an interaction concept and input devices for optical tracking in virtual immersive environments. Requirements to input devices for immersive environments will be based on a document, outlining major requirements for VR-systems. A preliminary testing of the usability will be discussed. We conclude this abstract by presenting our interim findings.

Open ActiveWrl - A Middleware Based Software Development Toolkit for Immersive VE Systems

C. Winkelholz, T. Alexander & M. Weiß
A Virtual Environment (VE) is not an application in itself. It should further be seen as a complex, multi modal human-computer interface. Immersive VE systems must be able to couple resources, most likely distributed in a cluster, into a parallel, real-time simulation. The shortcoming of most VE software libraries is the inability to provide an environment that satisfies the three main requirements in the implementation of a VE system, namely the design of the VE...

Developing Effective Navigation Techniques in Virtual 3D Environments

Sabine Volbracht & Gitta Domik
As a result of the increasing use of three-dimensional environments and of frequently inefficient possibilities for navigation, a fundamental understanding of navigation is becoming ever more important, both for users as well as for developers of three-dimensional environments. To promote this understanding a rigorous model for navigation was developed. The navigation model contains the relevant factors of influence and determines quality criteria for an efficient navigation. The model is used in a practical study. In...

Continuously-Adaptive Haptic Rendering

Jihad El-Sana & Amitabh Varshney
Haptic display with force feedback is often necessary in several virtual environments. To enable haptic rendering of large datasets we introduce Continuously-Adaptive Haptic Rendering, a novel approach to reduce the complexity of the rendered dataset. We construct a continuous, multiresolution hierarchy of the model during the pre-processing and then at run time we use high-detail representation for regions around the probe pointer and coarser representation farther away. We achieve this by using a bell-shaped filter...

An Investigation into the design of an Interface for Interaction with a Virtual Environment representing a four-dimensional object

R. Wellard & S.C. Chapman
Five methods of mapping the input from a six-degrees-of-freedom input device to the set of rotations available in four-dimensional space are evaluated with respect to how well they can be used to perform four-dimensional target aquisition tasks. Also evaluated are the user's opinions of the methods of interaction. Two of the five interaction methods perform significantly better than the rest allowing some general results to be drawn.....

Using Exercise Cycle as a Haptic Input Device in a Virtual Environment

Pasi Välkkynen, Juhani Heinilä, Sari Lainio, Sami Lakaniemi & Antti Väätänen
Virku (Virtual Fitness Centre) is a study, in which an exercise cycle is used for navigating in a virtual environment. The cycle acts as a haptic bodily user interface between the user and the simulation. The simulation takes the terrain of the virtual environment into account in order to provide better feedback of the environment for the user. We have found out in usability tests that this kind of interface enhances the user's feeling of...

Virtual Prints: Leaving trails in Virtual Environments

D. Grammenos, M. Filou, P. Papadakos & C. Stephanidis
In this paper the concept of Virtual Prints (ViPs) is introduced and alternative ways in which they can be used are suggested. The design and required functionality of a software mechanism for creating and interacting with ViPs in Virtual Environments are presented along with techniques and methods for overcoming related issues. Finally, the findings of an explorative study of the concept and pilot implementation are discussed.

LIVE@WEB.COM – Using CBIR Technology in InteractiveWeb-TV

Felix Morsdorf & Stephan Volmer
The increasing amount of internet based television broadcasts has lead to new approachs to interactivity in TV programs. We developed a system which is able to supply the viewer of the program upon interaction with information relating to the program, only based on the low-level visual content of the scene. This aim is achieved by comparing signatures describing the visual content of single frames of the video with a remote database of signatures derived from...

2BeOn - Interactive Television Supporting Interpersonal Communication

Jorge Abreu, Pedro Almeida & Vasco Branco
Interpersonal communication mediated by computer services supports the reinforcement and emergence of new communities brought together by leisure or work interests. This paper presents a workbench system that aims to study how the same principle can be applied in interactive television. The main objective is to allow TV users to be online (2BeOn) through the integration of basic and advanced communication services, enabling them to reinforce their interpersonal communication. The 2BeOn system is based on...

Estimating Traffic Density Using Sounds of Moving Vehicles

Jien Kato, Yoshitaka Hiramatsu & Toyohide Watanabe
This paper proposed a method for automatically estimating traffic density by using sounds of moving vehicles. The approach is based on the idea of recognition of the temporal variations that appear on the power signals when vehicles pass through an observation point. The local temporal variations in small periods of time are extracted by wavelet transformation and are used as an observation sequence for a hidden Markov model, which models the global temporal variations of...

Animating Peer-Level Annotations Within Web-Based Multimedia

Dick Bulterman
The TabletPC is an example of a new generation of user interface device where pen-based manipulation of information is integrated directly into a users workflow. Using the TabletPC's existing pen and electronic ink systems, a wide range of static documents can be created or annotated. While the facilities of the TabletPC are useful for creating virtual images containing ink that can be overlaid on text or picture context, there is little support for creating annotations...

A New Approach to Multimedia Information Filtering Based on its Structure

Xiaodi Huang & Jianming Yong
In information filtering systems, the multimedia documents are sequentially presented to users based on the user relevance values. This paper argues that the presented multimedia documents should be both important and relevant to the users. The importance of a document is determined by its relations to others in the collection. All users are supposed to look for important and relevant documents. Based on this view, a structure-based filtering framework is described, which incorporates the characteristics...

Mixing Images and Sketches for Retrieving Vector Drawings

A. Ferreira, M. J. Fonseca, Joaquim A. Jorge & M. Ramalho
Current approaches to content-based retrieval of multimedia data usually rely either on query by example or on sketches of the desired image, but not on both. In this paper, we propose a new query specification scheme, where digital images are combined with sketches, after vectorization, taking advantage of both methods. We selected a set of algorithms to perform image vectorization, taking into account the trade-off between vector image quality and processing time. This method of...

Image-based Rendering of the AnisotropicBRDF ofWoven Fabrics

Yuki Takeda, Huynh Quang Huy Viet & Hiromi T. Tanaka
The reflectance of fabric surface is commonly represented by a 4D bidirectional reflectance distribution function (BRDF). To generate the BRDF from measured data by a gonioreflectometer with 2 degrees of freedom of the light source and 2 degrees of freedom of the observing direction, it requires an enormous amount of measurements. In this paper, we propose an efficient image-based method for rendering the anisotropic BRDF of woven fabrics based on the micro facet surface geometry...

Mining the Human Genome using Virtual Reality

Bram Stolk, Faizal Abdoelrahman, Anton Koning & Paul Wielinga
The analysis of genomic data and integration of diverse biological data sources has become increasingly difficult for researches in the life sciences. This problem is exacerbated by the speed with which new data is gathered through automated technology like DNA microarrays. We developed a virtual reality application for visualizing hierarchical relationships within a gene family and for visualizing networks of gene expression data. Integration of other information from multiple databases with these visualizations can aid...

A Multi-thread Safe Foundation for Scene Graphs and its Extension to Clusters

G. Voß, J. Behr, D. Reiners & M. Roth
One of the main shortcomings of current scene graphs is their inability to support multi-thread safe data structures. This work describes the general framework used by the OpenSG scene graph system to enable multiple concurrent threads to independently manipulate the scene graph without interfering with each other. Furthermore the extensions of the presented mechanisms needed to support cluster systems are discussed.

Design and Implementation of A Large-scale Hybrid Distributed Graphics System

Jian Yang, Jiaoying Shi, Zhefan Jin & Hui Zhang
Although modern graphics hardware has strong capability to render millions of triangles within a second, huge scenes are still unable to be rendered in real-time. Lots of parallel and distributed graphics systems are explored to solve this problem. However none of them is built for large-scale graphics applications. We designed AnyGL, a large-scale hybrid distributed graphics system, which consists of four types of logical nodes, Geometry Distributing Node, Geometry Rendering Node, Image Composition Node and...

Parallel Performance Optimization of Large-Scale Unstructured Data Visualization for the Earth Simulator

L. Chen, I. Fujishiro & K. Nakajima
This paper describes some efficient parallel performance optimization strategies for large-scale unstructured data visualization on SMP cluster machines including the Earth Simulator in Japan. The three-level hybrid parallelization is employed in our implementation, consisting of message passing for inter-SMP node communication, loop directives by OpenMP for intra-SMP node parallelization, and vectorization for each processing element (PE). In order to improve the speedup performance for the hybrid parallelization, some techniques, such as multi-coloring for removing data...

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