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Convex hull covering of polygonal scenes for accurate collision detection in games

Convex hull covering of polygonal scenes for accurate collis...

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graphics Interface 2008

作者： Liu, Rong Zhang, Hao Busby, James Graphics Usability and Visualization Lab School of Computing Science Simon Fraser University Canada Radical Entertainment Canada

ISBN: (纸本)9781568814230

Decomposing a complex object into simpler pieces, e.g., convex patches or convex polyhedra, is a well-studied geometry problem. A well constructed decomposition can greatly accelerate collision detection since intersections with and between convex objects are fast to compute. In this paper, we look at a particular instance of the convex decomposition problem which arises from real-world game development. Given a collection of polyheclral surfaces (possibly with boundaries, holes, and complex interior structures) that model the scene geometry in a game environment, we wish to find a small set of convex hulls such that colliding objects in the scene against such a set of convex hulls produces the same game behavior as colliding against the original surfaces. The vague formulation of the problem is due to the difficulty of defining the space accessible by the objects involved in the game play. Under reasonable assumptions, we arrive at a set of conditions for valid convex decomposition and develop a construction algorithm via greedy merging driven by patch compactness. We show that our validity conditions ensure valid collision-related game behavior. The effectiveness of our decomposition algorithm is demonstrated through real examples from game development. To the best of our knowledge, no previous convex hull decomposition or surface decomposition algorithms were designed to handle the type of models we consider or be able to compute a set of convex hulls that ensure accurate collision detection results.

关键词： Software design

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Design as traversal and consequences: An exploration tool for experimental designs 07

Design as traversal and consequences: An exploration tool fo...

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graphics Interface 2007

作者： Jennings, Christopher G. Kirkpatrick, Arthur E. Graphics Visualization and Usability Lab. Department of Computing Science Simon Fraser University Canada

ISBN: (纸本)1568813376

We present a design space explorer for the space of experimental designs. For many design problems, design decisions are determined by the consequences of the design rather than its elemental parts. To support this need, the explorer is constructed to make the designer aware of design-level options, provide a structured context for design, and provide feedback on the consequences of design decisions. We argue that this approach encourages the designer to consider a wider variety of designs, which will lead to more effective designs overall. In a qualitative study, experiment designers using the explorer were found to consider a wider variety of designs and more designs overall than they reported considering in their normal practice.

关键词： Computer graphics

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Texture-based visualization of unsteady 3d flow by real-time advection and volumetric illumination

Texture-based visualization of unsteady 3d flow by real-time...

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作者： Weiskopf, Daniel Schafhitzel, Tobias Ertl, Thomas IEEE Computer Society Graphics Visualization and Usability Lab. School of Computing Science Simon Fraser University Burnaby BC V5A 1S6 Canada Institute of Visualization and Interactive Systems University of Stuttgart Universitätsstr. 38 70569 Stuttgart Germany

This paper presents an interactive technique for the dense texture-based visualization of unsteady 3D flow, taking into account issues of computational efficiency and visual perception. High efficiency is achieved by a 3D graphics processing unit (QPU)-based texture advection mechanism that implements logical 3D grid structures by physical memory in the form of 2D textures. This approach results in fast read and write access to physical memory, independent of GPU architecture. Slice-based direct volume rendering is used for the final display. We investigate two alternative methods for the volumetric illumination of the result of texture advection: First, gradient-based illumination that employs a real-time computation of gradients, and, second, line-based lighting based on illumination in codimension 2. In addition to the Phong model, perception-guided rendering methods are considered, such as cool/warm shading, halo rendering, or color-based depth cueing. The problems of clutter and occlusion are addressed by supporting a volumetric importance function that enhances features of the flow and reduces visual complexity in less interesting regions. GPU implementation aspects, performance measurements, and a discussion of results are included to demonstrate our visualization approach. © 2007 IEEE.

关键词： Data visualization

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Punctuated simplification of man-made objects

Punctuated simplification of man-made objects

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作者： Jang, Justin Wonka, Peter Ribarsky, William Shaw, Christopher D. Georgia Institute of Technology GVU Center College of Computing Atlanta GA 30332 United States Arizona State University PRISM Dept. of Computer Science and Engineering Tempe AZ 85287 United States UNC Charlotte CS Dept. Charlotte Visualization Center Charlotte NC 28223 United States Simon Fraser University Surrey School of Interactive Arts and Technology 14-660 Central City Tower 13450 102 Ave Surrey BC V3T 5X3 Canada Graphics Visualization and Usability Center Georgia Institute of Technology PRISM Lab. ASU Department of Information Technology UNC Charlotte Charlotte Visualization Center IEEE Visualization and Graphics Technical Committee School of Interactive Arts and Technology Simon Fraser University Surrey

We present a simplification algorithm for manifold polygonal meshes of plane-dominant models. Models of this type are likely to appear in man-made environments. While traditional simplification algorithms focus on generality and smooth meshes, the approach presented here considers a specific class of man-made models. By detecting and classifying edge loops on the mesh and providing a guided series of binary mesh partitions, our approach generates a series of simplified models, each of which better respects the semantics of these kinds of models than conventional approaches do. A guiding principle is to eliminate simplifications that do not make sense in constructed environments. This, coupled with the concept of "punctuated simplification", leads to an approach that is both efficient and delivers high visual quality. Comparative results are given.

关键词： Object oriented programming

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Gesture and response in field-based performance

Gesture and response in field-based performance

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Creativity and Cognition Proceedings 2005

作者： Wei, Sha Xin Gill, Satinder Topological Media Lab Graphics Visualization and Usability Center Georgia Institute of Technology Cambridge United Kingdom Program in Science Technology and Society Massachusetts Institute of Technology Cambridge United Kingdom Interaction Design Centre School of Computing Science Middlesex University London United Kingdom Centre for Music and Science Cambridge United Kingdom

ISBN: (纸本)1595930256

Ambience and immersive technological environments allow us to explore some basics of human pragmatics that lie beyond linguistics, intentionality and the subject-agency perspectives of human interaction. We focus on gesture and the body in sense-making and propose a discussion drawing on a non-dualist and agent-free account of embodied, material experience. By agent-free we mean an approach that does not presume a monolithic subject. Moreover, we deal with the problem of intersubjectivity by studying the human coordination of activity without appealing to a transmission theory of communication. [6] We achieve this by considering how gesture spans multiple bodies and how aesthetic design works with this and facilitates it. The paper is in two parts, the first part covers movement studies, focusing on gesture and body movement, drawing on the acting and pragmatics, and the second part develops this with the example of the TGarden, a responsive play space for experimental performance augmented by gesturally nuanced computational media. Copyright 2005 ACM.

关键词： Gesture recognition

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Rethinking visualization: A High-Level Taxonomy

Rethinking Visualization: A High-Level Taxonomy

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IEEE Symposium on Information visualization (INFOVIS)

作者： M. Tory T. Moller Graphics Usability and Visualization Lab School of Computing Science Simon Fraser University Canada

We present the novel high-level visualization taxonomy. Our taxonomy classifies visualization algorithms rather than data. Algorithms are categorized based on the assumptions they make about the data being visualized; we call this set of assumptions the design model. Because our taxonomy is based on design models, it is more flexible than existing taxonomies and considers the user's conceptual model, emphasizing the human aspect of visualization. Design models are classified according to whether they are discrete or continuous and by how much the algorithm designer chooses display attributes such as spatialization, timing, colour, and transparency. This novel approach provides an alternative view of the visualization field that helps explain how traditional divisions (e.g., information and scientific visualization) relates and overlap, and that may inspire research ideas in hybrid visualization areas

关键词： Taxonomy Data visualization Algorithm design and analysis graphics Usability Humans Displays Timing Information theory Application software

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Message from the Program Co-Chairs

Message from the Program Co-Chairs

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Proceedings - graphics Interface 2003

作者： Moller, Torsten Ware, Colin Graphics Usability/Visualisation Lab School of Computing Science Simon Fraser University Canada Data Visualization Research Lab Center for Coastal and Ocean Mapping University of New Hampshire United States

No abstract available

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Mental registration of 2D and 3D visualizations (an empirical study)

Mental registration of 2D and 3D visualizations (an empirica...

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IEEE Conference on visualization

作者： M. Tory Graphics Usability and Visualization (GRUVI) lab School of Computing Science Simon Fraser University Canada

2D and 3D views are used together in many visualization domains, such as medical imaging, flow visualization, oceanographic visualization, and computer aided design (CAD). Combining these views into one display can be done by: (1) orientation icon (i.e., separate windows), (2) in-place methods (e.g., clip and cutting planes), and (3) a new method called ExoVis. How 2D and 3D views are displayed affects ease of mental registration (understanding the spatial relationship between views), an important factor influencing user performance. This paper compares the above methods in terms of their ability to support mental registration. Empirical results show that mental registration is significantly easier with in-place displays than with ExoVis, and significantly easier with ExoVis than with orientation icons. Different mental transformation strategies can explain this result. The results suggest that ExoVis may be a better alternative to orientation icons when in-place displays are not appropriate (e.g., when in-place methods hide data or cut the 3D view into several pieces).

关键词： Three dimensional displays Computer displays Two dimensional displays Biomedical imaging Data visualization Graphical user interfaces Navigation Computer graphics Usability User interfaces

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Co-opting everyday objects 00

Co-opting everyday objects

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2000 Conference on Designing Augmented Reality Environments, DARE 2000

作者： Mynatt, Elizabeth D. Everyday Computing Lab Graphics Visualization and Usability Center Georgia Institute of Technology AtlantaGA30332-0280 United States

No abstract available.

ISBN: (纸本)9781450373265

No abstract available.

关键词： augmented reality visualization ubiquitous computing audio ligh-weight interaction awareness

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Requirements and architecture of an information visualization tool 2nd

Requirements and architecture of an information visualizatio...

引用

Proceedings of the 1995 IEEE visualization Workshop

作者： Mukherjea, Sougata Foley, James D. C and C Research Lab NEC USA San Jose 95134 CA United States Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta 30332 Ga United States

ISBN: (纸本)3540622217

This paper talks about the requirements for an effective information visualization tool. The architecture of Navigational View Builder, a tool to develop visualizations of the information space of hypermedia systems is also described. We then show how the tool satisfies the requirements of an information visualization tool. To conclude the paper we discuss some of the required features of the underlying database for producing effective visualizations. © Springer-Verlag Berlin Heidelberg 1996.

关键词： visualization

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