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Interactive behavioural update of large flocks

Interactive behavioural update of large flocks

引用

pacific conference on computer graphics and applications

作者： N. O'Hara Computer Applications University of Dublin Dublin Ireland

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

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Implementation of a graphics design framework on the Web

Implementation of a graphics design framework on the Web

引用

pacific conference on computer graphics and applications

作者： Xiaoyan Xie Hao Wang Zhiyong Huang School of Computing NUS Singapore

ISBN: (纸本)0769508685

We propose a client-server graphics design framework and implement a room design system using CORBA. We have integrated technologies used in distributed computation (Java and CORBA) and computer graphics (VRML). To support multiuser collaborative design, we propose a supplier-consumer communication approach and implement it using the event service in CORBA. Our system can be applied in electronic commerce to improve the existing systems by allowing customers to select furniture and to visualize the whole furnished room in 3D.

关键词： Layout Databases computer graphics Java Electronic commerce Application software Virtual environment Collaboration Data visualization Client-server systems

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Architecture of the simplified Chinese embedded system STARTH 4

Architecture of the simplified Chinese embedded system START...

引用

4th International conference/Exhibition on High Performance Computing in the Asia-pacific Region, HPC-Asia 2000

作者： Mao, P.X. Tang, Zhizhong Chen, M. Zhang, Youming Zhang, Vern Computer Science Department Tsinghua University Beijing100084 China Start Computer Group Co. Ltd. Fuzhou350002 China

ISBN: (纸本)0769505902

There is a trend for the information products that are integrated by computer, communication, and consumer electronics. The OS is required more compact and practical. An embedded system STARTH is developed based on the core of the Motorola PPSM that is a real time 32-bit kernel with prioritized interrupt scheduling. All tasks are interrupt-driven. The PPSM kernel does not access hardware device directly. The kernel controls all peripherals indirectly, through software device drivers. The PPSM tools consist of pen input, graphics, database, text, character input, system and communication. The PPSM toolsets, together with its device drivers, provides the basic contro of the LCD, the drawing functions, the real time clock and the UART. The architecture of the embedded system STARTH on the Dragon Ball EZ platform is discussed in parts in details. The development environments of both software and hardware are described. The system is analyzed from its initialization, registration to system management, even the applications programming. The STARTH is tested and run on the hardware system of Dragon Ball platform. It is found that STARTH is practical and reliable for personal information devices. © 2000 IEEE.

关键词： Embedded systems

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Mathematical approximation for real-time lighting rendering through participating media

Mathematical approximation for real-time lighting rendering ...

引用

pacific conference on computer graphics and applications

作者： P. Lecocq S. Michelin D. Arques A. Kemeny Renault-Research Division 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： Light sources Rendering (computer graphics) Hardware Integral equations Atmospheric modeling computer graphics Light scattering Acceleration Application software Workstations

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Virtual spectrophotometric measurements for biologically and physically-based rendering

Virtual spectrophotometric measurements for biologically and...

引用

pacific conference on computer graphics and applications

作者： G.V.G. Baranoski J.G. Rokne Guangwu Xu Department of Computer Science University of Utah USA Department of Computer Science University of Calgary Canada Diversinet Corporation Toronto Canada

The main topic of the paper is virtual spectrophotometers, virtual spectrophotometry and strategies for reducing the number of samples required to obtain asymptotically convergent measurements. A brief section on applications of virtual spectrophotometry is presented. This is followed by a careful formulation of virtual spectrophotometers. A virtual spectrophotometer, being a virtual device, is only described by its geometry.

关键词： Reflectivity Wavelength measurement Geometry computer science Energy measurement Optical reflection Monte Carlo methods Sampling methods Convergence Biology

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Blending pipe surfaces with piecewise algebraic surfaces

Blending pipe surfaces with piecewise algebraic surfaces

引用

pacific conference on computer graphics and applications

作者： Chen Changsong Chen Falai Feng Yuyu Department of Mathematics University of Science and Technology Hefei Anhui China

ISBN: (纸本)0769508685

Given the positions and orientations of several pipe surfaces (cylinders) in 3D space, a scheme for constructing a piecewise algebraic surface to blend the pipe surfaces is presented. The algorithm starts with a suitable partitioning of the 3D space into tetrahedra or prisms in which the algebraic surface patches are defined. Then a smooth piecewise algebraic surface is constructed which meets the pipe surfaces with a certain order of geometric continuity. The proper choice of free parameters is briefly discussed.

关键词： Shape control Space technology Mathematics Partitioning algorithms computer graphics Irrigation Interpolation Topology Solid modeling

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Non-distorted texture mapping using variational interpolation

Non-distorted texture mapping using variational interpolatio...

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pacific conference on computer graphics and applications

作者： Ying Tang Hujun Bao F.Y. Mong Qunsheng Peng State Key Laboratory of CAD&CG University of Zhejiang China

ISBN: (纸本)0769508685

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

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Low cost immersive displays: the cubicle of the future

Low cost immersive displays: the cubicle of the future

引用

pacific conference on computer graphics and applications

作者： M. Green Department of Computing Science University of Alberta Edmonton AB Canada

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

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Optimizing network 3D data transmissions for interactive applications

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

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pacific conference on computer graphics and applications

作者： I. Harada H. Sato H. Kitazawa NTT Lifestyle and Environmental Technology Laboratories Japan

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

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

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Line-art rendering of 3D-models

Line-art rendering of 3D-models

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pacific conference on computer graphics and applications

作者： C. Rossl L. Kobbelt Max Planck Institute of Computer Science Saarbrucken Germany

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

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