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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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GPU-Based Ray Tracing of Splats

GPU-Based Ray Tracing of Splats

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pacific conference on computer graphics and applications

作者： Rhushabh Goradia Sriram Kashyap Parag Chaudhuri Sharat Chandran Vision Graphics and Imaging Laboratory (ViGIL) Indian Institute of Technology Bombay India

When it comes to rendering models available as points, rather than meshes, splats are a common intermediate internal representation. In this paper we further the state of the art by ray tracing splats to produce expected effects such as reflections, refraction, and shadows. We render complex models at interactive frame rates allowing real time viewpoint, lighting, and material changes. Our system relies on efficient techniques of storing and traversing point models on graphics Processing Units (GPUs).

关键词： Octrees Rendering (computer graphics) Ray tracing graphics processing unit Instruction sets Acceleration Probes

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Modeling and rendering methods of clouds

Modeling and rendering methods of clouds

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pacific conference on computer graphics and applications

作者： T. Nishita Y. Dobashi University of Tokyo Bunkyo Tokyo Japan Hiroshima City University Hiroshima Japan

Recently, simulation of natural phenomena, such as water, smokes, fire, clouds, have been attempted in computer graphics. Clouds play an important role when generating images of outdoor scenes, the earth viewed from outer space and the visualization of weather information. This paper describes the modeling methods of clouds, and an efficient calculation method for light scattering due to clouds taking into account both multiple scattering and sky light. The methods discussed here are also useful for displaying snow.

关键词： Clouds Light scattering Rendering (computer graphics) Computational modeling computer simulation Fires computer graphics Image generation Layout Earth

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Lworld: an animation system based on rewriting

Lworld: an animation system based on rewriting

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pacific conference on computer graphics and applications

作者： H. Noser Institute of Computer Technology Multimedia Laboratory University of Zurich Zurich Switzerland

Lworld is a computer graphics animation system based on L-systems, a parallel rewriting technique used primarily in computer graphics for plant modeling. Because rule-based programming is a powerful technique, we use it as a basis for a general-purpose animation system. We describe the architecture, the features, and the programming language of the animation system. It is particularly well suited to model fractal curves, plants, fractal landscapes, group animation, visualization, and evolutionary optimizations. Lworld allows users to create real-time animations as well as raytraced image sequences for further movie production. It is freely available, and runs on PCs.

关键词： Animation computer graphics Power system modeling Fractals computer architecture computer languages Visualization Image sequences Motion pictures Production

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Topology-preserving simplification of 2D nonmanifold meshes with embedded structures

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VISUAL computer 2005年第8-10期21卷 679-688页

作者： Vivodtzev, F Bonneau, GP Le Texier, P INRIA Rhone Alpes INP Genoble CNRS UJFLab GRAVIR F-38334 Saint Ismier France CEA CESTA F-33114 Le Barp France

Mesh simplification has received tremendous attention over the years. Most of the previous work in this area deals with a proper choice of error measures to guide the simplification. Preserving the topological characteristics of the mesh and possibly of data attached to the mesh is a more recent topic and the subject of this paper. We introduce a new topology-preserving simplification algorithm for triangular meshes, possibly nonmanifold, with embedded polylines. In this context, embedded means that the edges of the polylines are also edges of the mesh. The paper introduces a robust test to detect if the collapse of an edge in the mesh modifies either the topology of the mesh or the topology of the embedded polylines. This validity test is derived using combinatorial topology results. More precisely, we define a so-called extended complex from the input mesh and the embedded polylines. We show that if an edge collapse of the mesh preserves the topology of this extended complex, then it also preserves both the topology of the mesh and the embedded polylines. Our validity test can be used for any 2-complex mesh, including nonmanifold triangular meshes, and can be combined with any previously introduced error measure. Implementation of this validity test is described. We demonstrate the power and versatility of our method with scientific data sets from neuroscience, geology, and CAD/CAM models from mechanical engineering.

关键词： computational geometry and its applications LOD techniques multiresolution curves and surfaces

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PRICAI 2022: Trends in Artificial Intelligence 1

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丛书名： Lecture Notes in computer Science

1000年

作者： Sankalp Khanna Jian Cao Quan Bai Guandong Xu

ISBN: (数字)9783031208683

ISBN: (纸本)9783031208676

This three-volume set, LNAI 13629, LNAI 13630, and LNAI 13631 constitutes the thoroughly refereed proceedings of the 19th pacific Rim conference on Artificial Intelligence, PRICAI 2022, held in Shangai, China, in November 10–13, 2022.;The 91 full papers and 39 short papers presented in these volumes were carefully reviewed and selected from 432 submissions. PRICAI covers a wide range of topics in the areas of social and economic importance for countries in the pacific Rim: artificial intelligence, machine learning, natural language processing, knowledge representation and reasoning, planning and scheduling, computer vision, distributed artificial intelligence, search methodologies, etc.

关键词： Artificial Intelligence Computing Milieux Information Systems and Communication Service computer applications computer Imaging, Vision, Pattern Recognition and graphics

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A practitioners' assessment of light reflection models

A practitioners' assessment of light reflection models

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pacific conference on computer graphics and applications

作者： P. Shirley B. Smits H. Hu E. Lafortune Computer Science Department University of Utah Salt Lake UT USA Program of Computer Graphics Cornell University Ithaca NY USA

We discuss the theory and practical issues behind creating reflection models to show the difficulty of the problem. We survey the current approaches towards reflection models for computer graphics to show that even for simple surfaces, the important issues are far from settled. We briefly discuss future directions for research. Finally, we present a case study of a particular type of light reflection that captures some important aspects of appearance for a limited class of materials with subsurface reflection.

关键词： Optical reflection Optical polarization Rough surfaces Surface roughness computer science Cities and towns Image generation Layout computer graphics Optical scattering

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Mathematical approximation for real-time lighting rendering through participating media

Mathematical approximation for real-time lighting rendering ...

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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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An efficient shadow algorithm for area light sources using BSP trees

An efficient shadow algorithm for area light sources using B...

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pacific conference on computer graphics and applications

作者： Kam-Wah Wong Wai-Wan Tsang Department of Computer Science and Information Systems University of Hong Kong Hong Kong China

ISBN: (纸本)0818686200

The paper presents a fast algorithm for computing shadow volumes of area light sources and performing shadow classification. The algorithm improves Chin and Feiner's method (N. Chin and S. Feiner, 1992) in the way that it does not subdivide an area light source before the processing of scene polygons. Instead, a light source is only subdivided when needed and is merged immediately when the need vanishes. Much redundant work is saved by avoiding the unnecessary subdivisions. Compared with Chin and Feiner's method, experiments show that the new method can run faster without loss of accuracy.

关键词： Light sources Layout Rendering (computer graphics) computer science Information systems Radio access networks Shape Image generation Pixel Ray tracing

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computer-Generated Papercutting

Computer-Generated Papercutting

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pacific conference on computer graphics and applications

作者： Jie Xu Craig S. Kaplan Xiaofeng Mi David R. Cheriton School of Computer Science University of Waterloo Waterloo ONT Canada Department of Computer Science Rutgers University Piscataway NJ USA

ISBN: (纸本)9780769530093;0769530095

The craft of papercutting is part of the folk art traditions of cultures all over the world. From the point of view of computer graphics, papercutting can be seen as a method of composing bi-level images under a set of geometric connectivity constraints. In this paper, we present a technique for composing digital paper-cut designs. The elements of a design may be images, which are processed via a multilayer thresholding operation, or they may be procedurallygenerated arrangements of shapes. Elements are composed using a set of boolean operators that preserve connectivity. The resulting designs are well suited to being cut by a new generation of inexpensive computer peripherals.

关键词： Shape Art computer science computer graphics Algorithm design and analysis Application software computer applications Nonhomogeneous media computer peripherals Control systems

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