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Perception of perspective distortions of man-made virtual objects 10

Perception of perspective distortions of man-made virtual ob...

引用

ACM SIGGRAPH 2010 Posters, SIGGRAPH '10

作者： Steinicke, Frank Bruder, Gerd Kuhl, Scott Visualization and Computer Graphics University of Munster Germany Department of Computer Science Michigan Technological University United States

ISBN: (纸本)9781450303934

In computer graphics one is often concerned with representing 3D objects on 2D displays, which provide often only a limited display field of view (DFOV) to the observer. Usually, planar geometric projections, in particular linear perspective projections, are applied, which make use of a straightforward mapping of graphical entities in a 3D view frustum to a 2D image plane. Corresponding to the DFOV introduced for computer screens, the aperture angle of the virtual camera is often denoted as geometric field of view (GFOV) [Kjelldahl and Prime 1995]. Projections of virtual objects on a computer screen are affected by the interplay between the GFOV that is used to render the scene, and the DFOV (see Figure 1). In this context, only little research has been conducted to identify perspective projections that appear realistic to users. Instead, graphics designers and developers often choose GFOVs that vary significantly from the DFOV [Steinicke et al. 2009]. © ACM 2010.

关键词： Interactive computer graphics

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Interactive Screen-Space Accurate Photon Tracing on GPUs

Interactive Screen-Space Accurate Photon Tracing on GPUs

引用

17th Eurographics Symposium on Rendering Techniques, EGSR 2006

作者： Krüger, Jens Bürger, Kai Westermann, Rüdiger Computer Graphics and Visualization Technische Universität München Germany

ISBN: (纸本)3905673355

Recent advances in algorithms and graphics hardware have opened the possibility to render caustics at interactive rates on commodity PCs. This paper extends on this work in that it presents a new method to directly render caustics on complex objects, to compute one or several refractions at such objects and to simulate caustics shadowing. At the core of our method is the idea to avoid the construction of photon maps by tracing photons in screen-space on programmable graphics hardware. Our algorithm is based on the rasterization of photon paths into texture maps. Intersection events are then resolved on a per-fragment basis using layered depth images. To correctly spread photon energy in screen-space we render aligned point sprites at the diffuse receivers where photons terminate. As our method does neither require any pre-processing nor an intermediate radiance representation it can efficiently deal with dynamic scenery and scenery that is modified, or even created on the GPU. © The Eurographics Association 2006.

关键词： Photons

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Guest editor's introduction

引用

computers and graphics 1993年第6期17卷 625-626页

作者： Göbel, Martin Fraunhofer-Institute for Computer Graphics Visualization Simulation Department Virtual Reality Demonstration Centre Darmstadt Germany

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A repository for 3D model production and interpretation in culture and beyond 11

A repository for 3D model production and interpretation in c...

引用

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

作者： Doerr, M. Tzompanaki, K. Theodoridou, M. Georgis, Ch. Axaridou, A. Havemann, S. Institute of Computer Science FORTH Crete Greece Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria

ISBN: (纸本)9783905674293

In order to support the work of researchers in the production, processing and interpretation of complex digital objects and the dissemination of valuable and diverse information to a broad spectrum of audience there is need for an integrated high performance environment that will combine knowledge base features with content management and information retrieval (IR) technologies. In this paper we describe the design and implementation of an integrated repository to ingest, store, manipulate, and export 3D Models, their related digital objects and metadata and to enable efficient access, use, reuse and preservation of the information, ensuring referential and semantic integrity. The repository design is based on an integrated coherent conceptual schema that models complex metadata regarding provenance information, structured models, formats, compatibility of 3D models, historical events and real world objects. This repository is not implemented just to be a storage location for digital objects;it is meant to be a working integrated platform for distant users who participate in a process chain consisting of several steps. A first prototype, in the field of Cultural Heritage, has already been implemented in the context of 3D-COFORM project, an integrated research project funded by the European Community's Seventh Framework Programme (FP7/2007-2013, no 231809) and the results are satisfactory, proving the feasibility of the design decisions which are absolutely new, ambitious, and extraordinarily generic for e-science. © The Eurographics Association 2010.

关键词： Metadata

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Progressive high-quality response surfaces for visually guided sensitivity analysis

Progressive high-quality response surfaces for visually guid...

引用

15th Eurographics Conference on visualization, EuroVis 2013

作者： Demir, I. Westermann, R. Computer Graphics and Visualization Group Technische Universität München Germany

In this paper we present a technique which allows us to perform high quality and progressive response surface prediction from multidimensional input samples in an efficient manner. We utilize kriging interpolation to estimate a response surface which minimizes the expectation value and variance of the prediction error. High computational efficiency is achieved by employing parallel matrix and vector operations on the GPU. Our approach differs from previous kriging approaches in that it uses a novel progressive updating scheme for new samples based on blockwise matrix inversion. In this way we can handle very large sample sets to which new samples are continually added. Furthermore, we can monitor the incremental evolution of the surface, providing a means to early terminate the computation when no significant changes have occurred. When the generation of input samples is fast enough, our technique enables steering this generation process interactively to find relevant dependency relations. © 2013 The Author(s).

关键词： Computational efficiency

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visualization of global correlation structures in uncertain 2D scalar fields

Visualization of global correlation structures in uncertain ...

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14th Eurographics Conference on visualization 2012, EuroVis 2012

作者： Pfaffelmoser, Tobias Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universität München Germany

Visualizing correlations, i.e., the tendency of uncertain data values at different spatial positions to change contrarily or according to each other, allows inferring on the possible variations of structures in the data. Visualizing global correlation structures, however, is extremely challenging, since it is not clear how the visualization of complicated long-range dependencies can be integrated into standard visualizations of spatial data. Furthermore, storing correlation information imposes a memory requirement that is quadratic in the number of spatial sample positions. This paper presents a novel approach for visualizing both positive and inverse global correlation structures in uncertain 2D scalar fields, where the uncertainty is modeled via a multivariate Gaussian distribution. We introduce a new measure for the degree of dependency of a random variable on its local and global surroundings, and we propose a spatial clustering approach based on this measure to classify regions of a particular correlation strength. The clustering performs a correlation filtering, which results in a representation that is only linear in the number of spatial sample points. Via cluster coloring the correlation information can be embedded into visualizations of other statistical quantities, such as the mean and the standard deviation. We finally propose a hierarchical cluster subdivision scheme to further allow for the simultaneous visualization of local and global correlations. © 2012 The Author(s).

关键词： visualization

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Interactive Visual Exploration of Unsteady 3D Flows

Interactive Visual Exploration of Unsteady 3D Flows

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9th Joint Eurographics/IEEE VGTC Symposium on visualization, EuroVis 2007

作者： Bürger, K. Schneider, J. Kondratieva, P. Krüger, J. Westermann, R. Computer Graphics and Visualization Group Technische Universität München Germany

ISBN: (纸本)9783905673456

In this paper we present GPU-based techniques for the interactive visualization of large unsteady 3D flow fields on uniform grids. We propose a novel dual-core approach to asynchronously stream such fields from the CPU, thus enabling the efficient exploration of large time-resolved sequences. This approach decouples visualization from data handling, resulting in interactive frame rates. Built upon a previously published GPU particle engine for flow visualization we have developed new strategies to compute and to visualize path lines and streak lines on the GPU. To provide additional visual cues, focus+context techniques for polygonal meshes have been integrated. The proposed techniques are used in the visual analysis of the Terashake 2.1 earthquake simulation data, and they have been shown to be very effective in revealing the relevant information in this data. © The Eurographics Association 2007.

关键词： Engines

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Liquid 2D Scatter Space for file system browsing

Liquid 2D Scatter Space for file system browsing

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9th International Conference on Information Visualisation

作者： Waldeck, C Dept. Z3 (MIV: Mobile Information Visualization) Computer Graphics Center ZGDV Germany ZGDV Computer Graphics Center Dept. Z3 MIV (Mobile Information Visualization) 64283 Darmstadt Fraunhofer Str. 5 Germany

ISBN: (纸本)0769523978

This (video-) paper describes a user interface concept, which facilitates multidimensional visual queries, filtering and browsing of the file system at the same time by means of the "Liquid Scatter Space" (LSS) concept ([1] Waldeck 2004). The UI concept is based on an advanced star field display ([2] Ahlberg & Shneiderman 1994) using liquid browsing [1] and selection based (sketch-) queries. It allows realtime search and browsing at the same time (integrated into one single user interface) and can visualize the most important file system meta data dimensions simultaneously: 1. filename, 2. creation/modification date, 3. filesize, 4. filetype and 5. label. LSS provides very fast and easy visual data mining possibilities for the desktop and makes it possible to perceive complex dependencies between the most important file system meta data properties at a glance. It also overcomes the "hidden-deep-down-in-hierarchy-structures "-problem by making it possible to use folders for structuring but not being bound to them. This paper focuses on visual design and interaction aspects and emphasizes the importance of paying regard to visual interactive details for information visualization and interaction interfaces and the need of making it easy to use.

关键词： liquid browsing focus and context visual interactive information spaces mobile computing user interface design dynamic interactive visualization visual data mining file system browsing

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Designing semantic game worlds

Designing semantic game worlds

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3rd Workshop on Procedural Content Generation in Games, PCG 2012, Organized in Conjunction with the Foundations of Digital Games Conference, FDG 2012

作者： Kessing, Jassin Tutenel, Tim Bidarra, Rafael Computer Graphics and Visualization Group Delft University of Technology Mekelweg 4 2628 CD Delft Netherlands

Current game worlds often fall short in providing consistency between the visual representation of the world and the way it feels, behaves, and reacts. This problem partly originates from the goal-oriented and cost-effective nature of the game development process, which mostly favors ad hoc solutions for one particular game, rather than investing in concepts like reusability and emergent gameplay. In broader terms, we observe that game worlds miss semantics, and we argue that its deployment has the potential to bring about the consistency missing in their content. Therefore, we present a novel approach aimed at enriching virtual entities in game worlds with information about their roles, how they relate to others, and how they can affect and interact with players, NPCs, and with each other. We discuss several requirements to achieve these goals, and introduce a semantic model to represent game worlds. In order to support and validate this model, we have developed Entika, a framework to facilitate the deployment of semantics during game development, as well as its maintenance during run-time. Furthermore, we briefly discuss several applications that demonstrate the power of this semantic model for game worlds. After careful evaluation of our semantic game world model and framework, we conclude that a semantically rich world representation can substantially assist designers in creating much more consistent game worlds.

关键词： Semantics

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Pre-integrated volume rendering for multi-dimensional transfer functions

Pre-integrated volume rendering for multi-dimensional transf...

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Joint IEEE/EG 7th International Symposium on Volume graphics, VG 2008 and 5th Symposium on Point-Based graphics, PBG 2008

作者： Kraus, M. Computer Graphics and Visualization Group Technische Universität München Germany

ISBN: (纸本)9783905674125

This work presents an efficient extension of pre-integrated volume rendering for multi-dimensional transfer functions. Since even two-dimensional transfer functions can result in strong rendering artifacts that cannot be resolved by standard ray casting, we propose a space-covering volume sampling scheme that does not require additional samples of the volume data. Based on this sampling scheme, our approach computes box integrals of the transfer functions, which are evaluated with the help of a small number of texture lookups in tabulated integral functions. We demonstrate the achieved performance and improvements in image quality with a prototypical GPU (graphics processing unit) implementation. © The Eurographics Association 2008.

关键词： Transfer functions

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