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Interactive behavioural update of large flocks 8

Interactive behavioural update of large flocks

引用

8th pacific conference on computer graphics and applications

作者： O'Hara, N Dublin City Univ Dublin 9 Ireland

ISBN: (纸本)0769508685

The availability of powerful and affordable 3D PC graphics boards has made the rendering of rich immersive environments possible at interactive speeds. The scene update rate and the appropriate behaviour of objects within the world are central to this immersive feeling. In this paper, we explore new techniques for increasing the efficiency of the flocking algorithm, which has been used extensively to emulate the flocking behaviour of creatures found in nature. The main contribution of this paper is a new method for imposing a hierarchical structure on the flock so that each members nearby neighbours can be determined more efficiently. This allows for far larger flocks to be updated at interactive speeds on a PC.

关键词： Aerospace simulation Birds Computational modeling computer applications computer graphics Layout Marine animals Rendering (computer graphics) Solid modeling Testing

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Mathematical approximation for real-time lighting rendering through participating media 8

Mathematical approximation for real-time lighting rendering ...

引用

8th pacific conference on computer graphics and applications

作者： Lecocq, P Michelin, S Arquès, D Kemeny, A Renault- Research Division France University of Marne-la-Vallée France

ISBN: (纸本)0769508685

Many shading models are able to provide realistic rendering of lighting effects under various atmospheric conditions but computational times are often expensive. This paper proposes a method to render lighting effects within participating media in real-time on a graphics workstation. It consists of mathematical approximations based on a re-formulation of the light transport equation considering atmospheric scattering with light sources described by their luminous intensity distribution. Hardware capabilities of graphics computer boards are used to accelerate parts of the rendering process.

关键词： Acceleration Application software Atmospheric modeling computer graphics Hardware Integral equations Light scattering Light sources Rendering (computer graphics) Workstations

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Optimizing network 3D data transmissions for interactive applications 8

Optimizing network 3D data transmissions for interactive app...

引用

8th pacific conference on computer graphics and applications

作者： Harada, I Sato, H Kitazawa, H NTT Lifestyle and Environmental Technology Laboratories Japan ATR Media Integration and Communications Research Laboratories Japan

ISBN: (纸本)0769508685

3D-object data transfer was optimized to accelerate interactive SD-scene design and virtual-space layout applications. In these applications, downloading many 3D objects reduces the interactivity of the clients. We used level of details based loading sequences and timing control methods to interleave data downloading and interactions. Experiments showed the maximum intervals between interactions were up to 6.42 times shorter.

关键词： Application software Data visualization Design optimization Layout Local area networks Poles and towers Research and development Timing Wide area networks

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Non-distorted texture mapping using variational interpolation 8

Non-distorted texture mapping using variational interpolatio...

引用

8th pacific conference on computer graphics and applications

作者： Tang, Y Bao, HJ Mong, FY Peng, QS State Key Lab. of CAD and CG Zhejiang University China Department of Computer Science City University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0769508685

This paper presents a new efficient texture mapping algorithm for polygonal meshes. Texture coordinates are assigned to the vertices of the mesh using the variational interpolation technique. For each patch to be mapped, the algorithm first samples equidistantly the boundaries of the patch. In order to decrease distortion, the patch is further sampled as uniformly as possible while its texture domain are correspondingly sampled. The variational interpolation technique is then invoked to yield a parameterization of the patch. The experimental results demonstrate that the algorithm has a great number of potential applications in texture mapping and surface modeling.

关键词： Application software computer science Image texture Interpolation Mesh generation Rendering (computer graphics) Sampling methods Scattering parameters Shape Surface texture

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Low cost immersive displays the cubicle of the future 8

Low cost immersive displays the cubicle of the future

引用

8th pacific conference on computer graphics and applications

作者： Green, M Univ Alberta Dept Comp Sci Edmonton AB Canada

ISBN: (纸本)0769508685

A number of immersive display technologies have been developed over the past decade. While many of these display technologies have proved to be effective, they are still far too expensive for common use. This paper presents a low cost immersive display device called Vision Space. This device can be viewed as a personal immersive workspace that takes the form of an office cubicle.

关键词： Application software computer displays Consumer products Costs Hardware Image generation Production Space exploration Space technology Three dimensional displays

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Rendering natural waters 8

Rendering natural waters

引用

8th pacific conference on computer graphics and applications

作者： Premoze, S Ashikhmin, M Univ Utah Dept Comp Sci Salt Lake City UT 84112 USA

ISBN: (纸本)0769508685

Creating and rendering realistic water is one of the most daunting tasks in computer graphics. Realistic rendering of water requires that the sunlight and skylight illumination are correct, the water surface is modeled accurately and that the light transport within water body is properly handled. This paper describes a method for wave generation on a water surface using a physically-based approach. The wave generation uses data from the oceanographical observations and it is controlled by intuitive parameters such as wind speed and wind direction. The optical behavior of the water surfaces is complex but is well-described in the ocean science literature. We present a simple and intuitive light transport approach that is easy to use for many different water types such as deep ocean water muddy coastal water, and fresh water bodies. We demonstrate our model for a number of water and atmospheric conditions.

关键词： Atmospheric modeling computer graphics Lighting Oceans Optical surface waves Rendering (computer graphics) Sea measurements Sea surface Surface waves Wind speed

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Intuitive virtual grasping for non haptic environments 8

Intuitive virtual grasping for non haptic environments

引用

8th pacific conference on computer graphics and applications

作者： Ullmann, T Sauer, J DaimlerChrysler AG Commercial Vehicle Dev D-71059 Sindelfingen Germany

ISBN: (纸本)0769508685

This paper presents an approach for grasping virtual objects in virtual environments with a data glove. Our focus lies on developing new methods that allow sensible realistic grasping gestures which correspond to human grasping behavior. To meet the demands of industrial applications, users must be able to grasp an object in an intuitive way with one or two hands and, beyond that, manipulate grasped objects between their fingers. To avoid the use of expensive force or touch feedback hardware, but also to ensure a safe grip on virtual objects, several forms of visual feedback are provided. First, we describe the basic algorithm for grasping with one or two hands and finally, we present a method to precisely manipulate the grasped objects between the virtual fingers.

关键词： HCI (human-computer interface) data glove virtual reality

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Line-art rendering of 3D-models 8

Line-art rendering of 3D-models

引用

8th pacific conference on computer graphics and applications

作者： Rössl, C Kobbelt, L Max Planck Inst Comp Sci D-66133 Saarbrucken Germany

ISBN: (纸本)0769508685

We present an interactive system for computer aided generation of line art drawings to illustrate 3D models that are given as triangulated surfaces. In a preprocessing step an enhanced 2D view of the scene is computed by sampling for every pixel the shading, the normal vectors and the principal directions obtained from discrete curvature analysis. Then streamlines are traced in the 2D direction fields and are used to define: line strokes. In order to reduce noise artifacts the user may interactively select sparse reference lines and the system will automatically fill in additional strokes. By exploiting the special structure of the streamlines an intuitive and simple tone mapping algorithm can be derived to generate the final rendering.

关键词： Art Focusing Interactive systems Layout Noise reduction Rendering (computer graphics) Sampling methods Streaming media Stress Tail

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Subdivision surface fitting with QEM-based mesh simplification and reconstruction of approximated B-spline surfaces 8

Subdivision surface fitting with QEM-based mesh simplificati...

引用

8th pacific conference on computer graphics and applications

作者： Takeuchi, S Kanai, T Suzuki, H Shimada, K Kimura, F Univ Tokyo Dept Precis Engn Bunkyo Ku Tokyo 1138656 Japan

ISBN: (纸本)0769508685

We present a general method for automatically reconstructing a network of B-spline patches based on the Doo-Sabin subdivision surface. This method consists of two parts, surface fitting and surface construction. In surface fitting, mesh simplification based on QEM (Quadric Error Metrics) is used and a control mesh that approximates a Doo-Sabin subdivision surface is constructed. In surface construction, rye define a B-spline surface using a surface spline method;and a constructed network of B-spline patches is guaranteed G(1) continuous. In addition, this method has the advantage of enabling the user to select detail levels of the control mesh by utilizing a mesh simplification process.

关键词： computer graphics geometric modeling subdivision surface surface fitting mesh simplification

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Practical texture mapping on free-form surfaces 8

Practical texture mapping on free-form surfaces

引用

8th pacific conference on computer graphics and applications

作者： Iwakiri, Y Omori, Y Kanko, T Toyohashi Univ Technol Dept Informat & Comp Sci Toyohashi Aichi 4418580 Japan

ISBN: (纸本)0769508685

This paper is concerned with the problem of mapping photographic images onto the surface of a 3D object whose geometric data are already known. Although the minimal view selection algorithm by Matsushita and Kaneko [II] enables the selection of a minimal number of camera positions, it often results into un-textured patches due to camera misalignment: a deviation of actual camera position from the specified position. This paper proposes two new practical algorithms (double and product viewing) to ensure all the polygons to be textured even if there are unavoidable human errors in camera alignment. The performance of the algorithms is evaluated by simulation experiments.

关键词： Cameras Computational modeling computer errors Geometrical optics Geometry Humans Shape measurement Solid modeling Surface texture TV

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