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Advanced illumination for gpu volume

Advanced illumination for gpu volume

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ACM SIGGRAPH ASIA 2008 Courses, SIGGRAPH Asia'08

作者： Salama, Christof Rezk Ropinski, Timo Hadwiger, Markus Ljung, Patric 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 VRVis Research Center for Virtual Reality and Visualization Donau-City-StraBe A-1220 Vienna Austria Siemens Corporate Research Imaging and Visualization Department 755 College Road East Princeton NJ 08540 United States

Volume raycasting techniques are important for both visual arts and. They allow an efficient generation of visual effects and visualization of scientific data obtained by tomography or numerical. Thanks to their flexibility, experts agree that GPU-based is the state-of-the art technique for interactive volume *** most likely replace existing slice-based techniques in the near. Volume rendering techniques are also effective for the direct rendering implicit surfaces used for soft body animation and constructive *** starts off with an in-depth introduction to the concepts GPU-based ray-casting to provide a common base for the following. The focus of this course is on advanced illumination techniques approximate the physically-based light transport more convincingly. techniques include interactive implementation of soft hard shadows, ambient occlusion and simple Monte-Carlo based approaches global illumination including translucency and scattering. the proposed techniques, users are le to interactively create images from volumetric data whose visual quality goes far traditional approaches. The optical properties in participating are defined using the phase function. Many approximations to the based light transport applied for rendering natural phenomena as clouds or smoke assume a rather homogenous phase function. For rendering volumetric scans on the other hand different phase models are required to account for both surface-like structures fuzzy boundaries in the data. Using volume rendering techniques,who create medical visualization for science magazines may now work on tomographic scans directly, without the necessity to fall back to creating polygonal models of anatomical structures.

关键词： Volume rendering

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The arrigo showcase reloaded - Towards a sustainable link between 3D and semantics

The arrigo showcase reloaded - Towards a sustainable link be...

引用

9th International Symposium on Virtual Reality, Archaeology, and Cultural Heritage, VAST 2008

作者： Havemann, S. Settgast, V. Berndt, R. Eide, O. Fellner, D.W. Institute of Computer Graphics and Knowledge Visualization TU Graz Austria Unit for Digital Documentation University of Oslo Norway TU Darmstadt and Fraunhofer IGD Germany

ISBN: (纸本)9783905674149

It is still a big technical problem to establish a relation between a shape and its meaning in a sustainable way. We present a solution with a markup method that allows to label parts of a 3D object in a similar way to labeling parts of a hypertext. A 3D-markup can serve both as hyperlink and as link anchor, which is the key to bi-directional linking between 3D objects and web documents. Our focus is on a sustainable 3D software infrastructure for application scenarios ranging from e-mail and internet over authoring and browsing semantic networks to interactive museum presentations. We demonstrate the workflow and the effectiveness of our tools by re-doing the Arrigo 3D showcase. We are working towards a "best practice" example for information modeling in cultural heritage. ©The Eurographics Association 2008.

关键词： Hypertext systems

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Analyses of human sensitivity to redirected walking 08

Analyses of human sensitivity to redirected walking

引用

VRST 2008 ACM Symposium on Virtual Reality Software and Technology

作者： Steinicke, Frank Bruder, Gerd Jerald, Jason Frenz, Harald Lappe, Markus Visualization and Computer Graphics Group Department of Computer Science WWU Münster Germany Effective Virtual Environments Group Department of Computer Science UNC Chapel Hill United States Psychology Department II WWU Münster Germany

ISBN: (纸本)9781595939517

Redirected walking allows users to walk through large-scale immersive virtual environments (IVEs) while physically remaining in a reasonably small workspace by intentionally injecting scene motion into the IVE. In a constant stimuli experiment with a twoalternative-forced-choice task we have quantified how much humans can unknowingly be redirected on virtual paths which are different from the paths they actually walk. 18 subjects have been tested in four different experiments: (E1a) discrimination between virtual and physical rotation, (E1b) discrimination between two successive rotations, (E2) discrimination between virtual and physical translation, and discrimination of walking direction (E3a) without and (E3b) with start-up. In experiment E1a subjects performed rotations to which different gains have been applied, and then had to choose whether or not the visually perceived rotation was greater than the physical rotation. In experiment E1b subjects discriminated between two successive rotations where different gains have been applied to the physical rotation. In experiment E2 subjects chose if they thought that the physical walk was longer than the visually perceived scaled travel distance. In experiment E3a subjects walked a straight path in the IVE which was physically bent to the left or to the right, and they estimate the direction of the curvature. In experiment E3a the gain was applied immediately, whereas the gain was applied after a start-up of two meters in experiment E3b. Our results show that users can be turned physically about 68% more or 10% less than the perceived virtual rotation, distances can be up-or down-scaled by 22%, and users can be redirected on an circular arc with a radius greater than 24 meters while they believe they are walking straight. Copyright 2008 ACM.

关键词： Rotation

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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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Computational steering for patient-specific implant planning in orthopedics

Computational steering for patient-specific implant planning...

引用

1st Eurographics Workshop on Visual Computing and Biomedicine, EG VCBM 2008

作者： Dick, Christian Georgii, Joachim Burgkart, Rainer Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universität München Germany Klinik u. Poliklinik für Orthopädie Sportorthopädie Klinikum Rechts der Isar Technische Universität München Germany

ISBN: (纸本)9783905674132

Fast and reliable methods for predicting and monitoring in-vivo bone strength are of great importance for hip joint replacement. To avoid adaptive remodeling with cortical thinning and increased porosity of the bone due to stress shielding, in a preoperative planning process the optimal implant design, size, and position has to be determined. This process involves interactive implant positioning within the bone as well as simulation and visualization of the stress within bone and implant due to exerting forces. In this paper, we present a prototype of such a visual analysis tool, which, to our best knowledge, provides the first computational steering environment for optimal implant selection and positioning. This prototype considers patient-specific biomechanical properties of the bone to select the optimal implant design, size, and position according to the prediction of individual load transfer from the implant to the bone. We have developed a fast and stable multigrid finite-element solver for hexahedral elements, which enables interactive simulation of the stress distribution within the bone and the implant. By utilizing a real-time GPU-method to detect elements that are covered by the moving implant, we can automatically generate computational models from patient-specific CT scans in real-time, and we can instantly feed these models into the simulation process. Hardware-accelerated volume ray-casting, which is extended by a new method to accurately visualize sub-hexahedron implant boundaries, provides a new quality of orthopedic surgery planning. © The Eurographics Association 2008.

关键词： Bone

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Integrating multimedia repositories into the PROBADO framework

Integrating multimedia repositories into the PROBADO framewo...

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International Conference on Digital Information Management (ICDIM)

作者： Ina Blumel Jurgen Diet Harald Krottmaier German National Library of Science and Technology TIB Hanover Germany Bavarian State Library Munich Germany Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Graz Austria

In this paper, we describe a digital library initiative for non-textual documents. The proposed framework will integrate different types of content-repositories - each one specialized for a specific multimedia domain - into one seamless system and will add features such as automatic annotation, full-text retrieval and recommender services to non-textual documents. Two multimedia domains, 3D graphics and music, will be introduced. The repositories can be searched using both textual (metadata-based) and non-textual retrieval mechanisms (e.g. using a complex sketch-based interface for searching in 3D-models or a query-by-humming interface for music). Domain-specific metadata models are developed and workflows for automated content-based data analysis and indexing proposed.

关键词： Software libraries Indexing Music information retrieval Content based retrieval Data analysis Text analysis computer graphics visualization Multimedia systems Content management

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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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GPGPU flow 07

GPGPU flow

引用

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

作者： Kruger, Jens computer graphics & visualization

No abstract available

ISBN: (纸本)9781450318235

No abstract available

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GPGPU and raytracing 07

GPGPU and raytracing

引用

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

作者： Kruger, Jens computer graphics & visualization

No abstract available

ISBN: (纸本)9781450318235

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Rendering on Tiled Displays using Advanced Stream Caching

Rendering on Tiled Displays using Advanced Stream Caching

引用

13th Eurographics Symposium on Virtual Environments, EGVE 2007

作者： Lorenz, Mario Brunnett, Guido Heinz, Marcel Computer Graphics and Visualization Chemnitz University of Technology Germany

ISBN: (纸本)9783905673647

To render complex scenes on tiled displays efficiently modifications to the Chromium framework have been proposed that lead to significant lower processor and memory load on the client and a very effective utilization of available network bandwidth. To avoid redundant transmissions of identical command sequences that are generated by the application a transparent stream cache can be used that accelerates the multicast communication channel. It can be profiled that applications that do not use display lists or VBO's to control the rendering put a heavy load on the client host because the cache control has to compute a checksum for the identification of repeated command sequences. In this paper we analyse the possibilities to improve the stream caching for unmodified GL applications. As our main result we introduce a new GL extension to control the stream cache with minimally modified applications. © The Eurographics Association 2007.

关键词： Rendering (computer graphics)

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