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Importance-Driven Particle Techniques for Flow visualization

Importance-Driven Particle Techniques for Flow Visualization

引用

Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Kai Burger Polina Kondratieva Jens Kruger Rudiger Westermann Computer Graphics and Visualization Group Technische Universität München Computer Graphics and Visualization Group Technische Universität München Germany Scientific Computing and Imaging Institute University of Utah USA

Particle tracing has been established as a powerful visualization technique to show the dynamics of 3D flows. Particle tracing in 3D, however, quickly overextends the viewer due to the massive amount of visual information that is typically produced by this technique. In this paper, we present strategies to reduce this amount at the same time revealing important structures in the flow. As an importance measure, we introduce a simple, yet effective clustering approach for vector fields, and we use scalar flow quantities at different scales in combination with user-defined regions of interest. These measures are used to control the shape, the appearance, and the density of particles in such a way that the user can focus on the dynamics in important regions at the same time preserving context information. We also introduce a new focus for particle tracing, so called anchor lines. Anchor lines are used to analyze local flow features by visualizing how much particles separate over time and how long it takes until they have separated to a fixed distance. It is of particular interest if the finite time Lyapunov exponent - a scalar quantity that measures the rate of separation of infinitesimally close particles in the flow - is used to guide the placement of anchor lines. The effectiveness of our approaches for the visualization of 3D flow fields is validated using synthetic fields as well as real simulation data.

关键词： Data visualization computer graphics Particle measurements Shape measurement Time measurement Shape control Rendering (computer graphics) Scientific computing Density measurement Focusing

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visualization of big SPH simulations via compressed octree grids

Visualization of big SPH simulations via compressed octree g...

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IEEE International Conference on Big Data

作者： Florian Reichl Marc Treib Rüdiger Westermann Technische Universität München Computer Graphics & Visualization Group Munich Germany

ISBN: (纸本)9781479912940

Interactive and high-quality visualization of spatially continuous 3D fields represented by scattered distributions of billions of particles is challenging. One common approach is to resample the quantities carried by the particles to a regular grid and to render the grid via volume ray-casting. In large-scale applications such as astrophysics, however, the required grid resolution can easily exceed 10K samples per spatial dimension, letting resampling approaches appear unfeasible. In this paper we demonstrate that even in these extreme cases such approaches perform surprisingly well, both in terms of memory requirement and rendering performance. We resample the particle data to a multiresolution multiblock grid, where the resolution of the blocks is dictated by the particle distribution. From this structure we build an octree grid, and we then compress each block in the hierarchy at no visual loss using wavelet-based compression. Since decompression can be performed on the GPU, it can be integrated effectively into GPU-based out-of-core volume ray-casting. We compare our approach to the perspective grid approach which resamples at run-time into a view-aligned grid. We demonstrate considerably faster rendering times at high quality, at only a moderate memory increase compared to the raw particle set.

关键词： graphics processing units Rendering (computer graphics) Octrees Three-dimensional displays Instruction sets Smoothing methods Discrete wavelet transforms

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Feature-based visualization of dense integral line data

Feature-based visualization of dense integral line data

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International Research and Training Group 1131 Workshop on visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering, VLUDS 2011

作者： Schröder, Simon Obermaier, Harald Garth, Christoph Joy, Kenneth I. Computer Graphics and HCI Group University of Kaiserslautern Germany Fraunhofer ITWM Kaiserslautern Germany Computational Topology Group University of Kaiserslautern Germany Institute for Data Analysis and Visualization University of California Davis United States

ISBN: (纸本)9783939897460

Feature-based visualization of flow fields has proven as an effective tool for flow analysis. While most flow visualization techniques operate on vector field data, our visualization techniques make use of a different simulation output: Particle Tracers. Our approach solely relies on integral lines that can be easily obtained from most simulation software. The task is the visualization of dense integral line data. We combine existing methods for streamline visualization, i. e. illumination, transparency, and halos, and add ambient occlusion for lines. But, this only solves one part of the problem: because of the high density of lines, visualization has to fight with occlusion, high frequency noise, and overlaps. As a solution we propose non-automated choices of transfer functions on curve properties that help highlighting important flow features like vortices or turbulent areas. These curve properties resemble some of the original flow properties. With the new combination of existing line drawing methods and the addition of ambient occlusion we improve the visualization of lines by adding better shape and depth cues. The intelligent use of transfer functions on curve properties reduces visual clutter and helps focusing on important features while still retaining context, as demonstrated in the examples given in this work.

关键词： Transfer functions

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Modeling and visualizing the cultural heritage data set of Graz 01

Modeling and visualizing the cultural heritage data set of G...

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Proceedings of the 2001 conference on Virtual reality, archeology, and cultural heritage

作者： Christopher Zach Andreas Klaus Joachim Bauer Konrad Karner Markus Grabner VRVis Research Center for Virtual Reality and Visualization and Institute for Computer Graphics and Vision Graz Austria Institute for Computer Graphics and Vision Graz Austria

ISBN: (纸本)9781581134476

The inner city (Old Town) of Graz will be the European cultural capital in 2003. In this paper we present preliminary results on the reconstruction and visualization of this kind of cultural heritage data. Starting with a simple block model obtained by converting 2 1/2 dimensional GIS (geographic information system) data we focus on the image based modeling of the facades. Herein we illustrate a robust search for corresponding points to estimate the relative orientation between image ***, we outline our real-time rendering approach based on a LOD-R-tree concept. Special attention is paid on the LOD (level of detail) generation for historic buildings where two different ways working in 2D and 3D are explained. The visualization system is communicating asynchronously with a database system storing the LOD-R-tree data structure. This client-server configuration provides interactive navigation through the virtual scene and the scalability of a database management system.

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Optimization of an autostereoscopic display for a driving simulator

Optimization of an autostereoscopic display for a driving si...

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International Conference on computer graphics Theory and Applications, GRAPP 2013 and International Conference on Information visualization Theory and Applications, IVAPP 2013

作者： Eggeling, Eva Fellner, Dieter W. Halm, Andreas Ullrich, Torsten Fraunhofer Austria Research GmbH Inffeldgasse 16c Graz Austria Institute of Computer Graphics and Knowledge Visualization TU Graz Graz Austria GRIS TU Darmstadt and Fraunhofer IGD Darmstadt Germany

ISBN: (纸本)9789898565464

In this paper, we present an algorithm to optimize a 3D stereoscopic display based on parallax barriers for a driving simulator. The main purpose of the simulator is to enable user studies in reproducible laboratory conditions to test and evaluate driving assistance systems. The main idea of our optimization approach is to determine by numerical analysis the best pattern for an autostereoscopic display with the best image separation for each eye, integrated into a virtual reality environment. Our implementation uses a differential evolution algorithm, which is a parallel, direct search method based on evolution strategies, because it converges fast and is inherently parallel. This allows an execution on a network of computers. The resulting algorithm allows optimizing the display and its corresponding pattern, such that a single user in the simulator environment sees a stereoscopic image without being supported by special eye-wear.

关键词： Global optimization

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Dynamic process support based on users' behavior

Dynamic process support based on users' behavior

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International Conference on Interactive Collaborative Learning (ICL)

作者： Dirk Burkhardt Kawa Nazemi Information Visualization and Visual Analytics Fraunhofer-Institute for Computer Graphics Research Darmstadt Germany

Nowadays there is a gap between the possibilities and the massively existing data on the one side and the user as main worker on the other side. In different scenarios e.g. search, exploration, analysis and policy-modeling a user has to deal with massive information, but for this work he usually gets a static designed system. So meanwhile data-driven work-processes are increasing in its complexity the support of the users who are working with these data is limited on basic features. Hence this paper describes a concept for a process-supporting approach, which includes relevant aspects of users' behaviors in support him to successfully finish also complex tasks. This will be achieved by a process-based guidance with an automatic tools selection for every process and activity on the one hand. And on the other hand the consideration of expert-level of a user to a single task and process. This expert-level will be classified during each task and process interaction and allow the automatically selection of optimal tools for a concrete task. In final the user gets for every task an automatically initialized user-interface with useful and required tools.

关键词： Data visualization Process control computers Adaptation models Software Context Business

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Simulator sickness and presence in a high field-of-view virtual environment

Simulator sickness and presence in a high field-of-view virt...

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Conference on Human Factors in Computing Systems

作者： Seay, A. Fleming Krum, David M. Hodges, Larry Ribarsky, William Human Computer Interaction Institute Carnegie Mellon University Pittsburgh PA 15213 United States Graphics Visualization/Usability C. Georgia Institute of Technology Atlanta GA 30332-0170 United States

ISBN: (纸本)1581134541

The effect of field-of-view, display type and user role on the experience of simulator sickness and presence in users of a virtual environment was investigated. A PC based assessment instrument was created to administer the Presence, Immersive Tendencies and Simulator Sickness questionnaires. The field-of-view was found to be the major determinant of both simulator sickness and presence.

关键词： Virtual reality

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Development of distributed multimedia virtual environment with multichannel visualization of multimedia data by graphic accelerators 23

Development of distributed multimedia virtual environment wi...

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23rd International Conference on computer graphics and Vision, GraphiCon 2013

作者： Morozov, Boris B. Dolgovesov, Boris S. Mazurok, Boris S. Gorodilov, Mikhail A. Software Systems for Computer Graphics Laboratory Institute of Automation and Electrometry SB RAS Russia Synthesizing Visualization Systems Laboratory Institute of Automation and Electrometry SB RAS Russia Institute of Automation and Electrometry SB RAS Russia

ISBN: (纸本)9785804414024

An approach to the development of technical solutions for the creating of a real-time Distributed Multimedia Virtual Environment is described. The main objective of the environment - control the formation and delivery of multimedia content from multiple sources to multiple recipients. © 23rd International Conference on computer graphics and Vision, GraphiCon 2013 - Conference Proceedings. All rights reserved.

关键词： Virtual reality

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Towards process-oriented Information visualization for supporting users

Towards process-oriented Information Visualization for suppo...

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International Conference on Interactive Collaborative Learning (ICL)

作者： Dirk Burkhardt Tobias Ruppert Kawa Nazemi Information Visualization and Visual Analytics Fraunhofer-Institute for Computer Graphics Research Darmstadt Germany

Nowadays daily office work consists of dealing with big numbers of data and data sources, and furthermore of working with complex computer programs. In consequence many users have problems to use such programs effective and efficient. In particular beginners have significant problems to use the programs correctly due to complex functionality and interaction options. To avoid this overload of the user, the Information visualization community has recently developed some approaches that aim to support the users. Unfortunately, these approaches are limited to one special aspect, and sometimes they are just appropriate for one special task. Thus, in this paper we introduce a process-oriented user-supporting approach. It allows selecting adequate supporting techniques in correlation to a performed process and activity to guide the user and help him to solve his task. Furthermore, we show the benefits of designing programs and applications, which implement process definitions for the existing tasks to provide the user with better process orientation. This guides the user through difficult and complex processes.

关键词： Data visualization Semantics Visual analytics Keyboards computers Concrete

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Optimal regular volume sampling 01

Optimal regular volume sampling

引用

IEEE Conference on visualization

作者： T. Theussl T. Moller M.E. Groller Institute of Computer Graphics and Algorithms Vienna University of Technology Graphics Usability and Visualization Lab Simon Fraser University Canada Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)0780372018

The classification of volumetric data sets as well as their rendering algorithms are typically based on the representation of the underlying grid. Grid structures based on a Cartesian lattice are the de-facto standard for regular representations of volumetric data. In this paper we introduce a more general concept of regular grids for the representation of volumetric data. We demonstrate that a specific type of regular lattice-the so-called body-centered cubic-is able to represent the same data set as a Cartesian grid to the same accuracy but with 29.3% fewer samples. This speeds up traditional volume rendering algorithms by the same ratio, which we demonstrate by adopting a splatting implementation for these new lattices. We investigate different filtering methods required for computing the normals on this lattice. The lattice representation results also in lossless compression ratios that are better than previously reported. Although other regular grid structures achieve the same sample efficiency, the body-centered cubic is particularly easy to use. The only assumption necessary is that the underlying volume is isotropic and band-limited-an assumption that is valid for most practical data sets.

关键词： Sampling methods Lattices Signal sampling computer graphics Data visualization Signal processing algorithms Physics Energy states Image processing Image sampling

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