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FastMesh: efficient view-dependent meshing

FastMesh: efficient view-dependent meshing

引用

pacific conference on computer graphics and applications

作者： R. Pajarola Information & Computer Science University of California Irvine Irvine CA USA

The article presents an optimized view-dependent meshing framework for adaptive and continuous level-of-detail (LOD) rendering in real-time. Multiresolution triangle mesh representations are an important tool for adapting triangle mesh complexity in real-time rendering environments. Ideally, for interactive visualization, a triangle mesh is simplified to the maximal tolerated perceptual error, and thus mesh simplification is view-dependent. The paper introduces an efficient hierarchical multiresolution triangulation framework based on a half-edge triangle mesh data structure, and presents an optimized computation of several view-dependent error metrics within that framework, providing conservative error bounds. The presented approach called FastMesh, is highly efficient both in space and time cost, and it spends only a fraction of the time required for rendering to perform the error calculations and dynamic mesh updates.

关键词： computer errors computer graphics Pipelines Data structures computer science Data visualization Costs Rendering (computer graphics) Error correction Chromium

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A method for modeling and rendering dunes with wind-ripples

A method for modeling and rendering dunes with wind-ripples

引用

pacific conference on computer graphics and applications

作者： K. Onoue T. Nishita Graduate School of Frontier Sciences University of Tokyo Bunkyo Tokyo Japan

This paper proposes a method for modeling and rendering realistic desert scenes. A desert terrain includes sand dunes and wind ripples. We use two types of scale models to form them. We render the dunes with the wind-... 详细信息

关键词： Layout Rendering (computer graphics) Creep Terrain mapping Vegetation mapping Computational modeling Large-scale systems Equations computer graphics Clouds

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Representing spheres and ellipsoids using periodic NURBS surfaces with fewer control vertices

Representing spheres and ellipsoids using periodic NURBS sur...

引用

pacific conference on computer graphics and applications

作者： Kaihuai Qin Wenping Wang Zesheng Tang Departmentof Computer Science& Tech. Tsinghua University Beijing China Department of Computer Science University of Hong Kong Hong Kong China Departmentof Computer Science & Tech. Tsinghua University Beijing China

A new kind of NURBS representation for periodic curves is introduced. The method for periodic curves is extended to derive a compact and symmetric representation of the sphere or the ellipsoid using a piecewise bi-qua... 详细信息

ISBN: (纸本)0818686200

关键词： Ellipsoids Spline Surface topography Surface reconstruction Weight control computer science Transmission line matrix methods Sufficient conditions

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Adaptive smoothing tangential direction fields on polygonal surfaces

Adaptive smoothing tangential direction fields on polygonal ...

引用

pacific conference on computer graphics and applications

作者： Y. Ohtake M. Horikawa A. Belyaev Graduate School of Computer Science and Engineering University of Aizu Fukushima Japan University of Aizu Fukushima Japan

The paper develops a simple and effective method for adaptive smoothing tangential direction fields defined on piecewise smooth surfaces approximated by triangle meshes. The method consists of simultaneous and iterative updating each vertex direction by a weighted sum of the directions at the neighboring vertices. The weights themselves depend on directions: if the direction at a given vertex differs strongly from the direction at a neighboring vertex, then the weight associated with that neighboring direction is chosen small. Choosing such nonlinear weights allows us to preserve important direction field discontinuities during the smoothing process. applications of the developed smoothing technique to curvature extrema detection and non-photorealistic rendering with curvature lines are given.

关键词： Smoothing methods Cities and towns Image processing Iterative methods Visualization computer science Application software computer graphics Fingerprint recognition Image matching

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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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Disparity mapping technique and fast rendering technique for view morphing

Disparity mapping technique and fast rendering technique for...

引用

pacific conference on computer graphics and applications

作者： T. Moritsu M. Kato Systems Development Laboratory Hitachi and Limited Kawasaki Japan

Two new techniques for view morphing are presented. The first technique is a disparity mapping technique which accurately maps the edges of input images on each other. By using this technique, one can reduce the blurring of synthesized images. The second technique is a data transformation technique which transforms morphing data into data which can be rendered on ordinary 3D graphic accelerators. By using this transformation, one achieve interactive morphing animations.

关键词： Rendering (computer graphics) Image segmentation graphics Pixel Animation Acceleration Image generation Laboratories Visual effects Interpolation

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On the numerical redundancies of geometric constraint systems

On the numerical redundancies of geometric constraint system...

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pacific conference on computer graphics and applications

作者： Yan-Tao Li Shi-Min Hu Ra-Guang Sun Department of Computer Science and Technoloa Tsinghua University Beijing China

ISBN: (纸本)0769512275

Determining redundant constraints is a critical task for geometric constraint solvers, since it dramatically affects the solution speed, accuracy, and stability. The paper attempts to determine the numerical redundancies of three-dimensional geometric constraint systems via a disturbance method. The constraints are translated into some unified forms and added to a constraint system incrementally. The redundancy of a constraint can then be decided by disturbing its value. We also prove that graph reduction methods can be used to accelerate the determination process.

关键词： Acceleration Algorithm design and analysis Sun computer science Stability Manufacturing Equations Testing Optimization methods

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Parallel volume rendering using PC graphics hardware

Parallel volume rendering using PC graphics hardware

引用

pacific conference on computer graphics and applications

作者： M. Magallon M. Hopf T. Ertl Visualization and Interactive Systems Group Ifl University of Stuttgart Stuttgart Germany

The paper describes an architecture that enables the use of commodity off the shelf graphics hardware along with high speed network devices for distributed volume rendering. Several PCs drive a number of graphic accelerator boards using an OpenGL interface. The frame buffers of the cards are read back and blended together for final presentation on a single PC working as front end. We explain how the attainable frame rates are limited by the transfer speeds over the network as well as the overhead implied by having to blend several images together. An initial implementation using four graphic cards achieves frame rates similar to those of high performance visualization systems.

关键词： Rendering (computer graphics) Hardware Personal communication networks computer graphics Data visualization Costs Interactive systems High-speed networks NASA Delay

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A method for modeling clouds based on atmospheric fluid dynamics

A method for modeling clouds based on atmospheric fluid dyna...

引用

pacific conference on computer graphics and applications

作者： R. Miyazaki S. Yoshida Y. Dobashi T. Nishita University of Tokyo Bunkyo Tokyo Japan Hokkaido University Sapporo Japan

The simulation of natural phenomena such as clouds, smoke, fire and water is one of the most important research areas in computer graphics. In particular, clouds play an important role in creating images of outdoor scenes. The proposed method is based on the physical simulation of atmospheric fluid dynamics which characterizes the shape of clouds. To take account of the dynamics, we used a method called the coupled map lattice (CML). CML is an extended method of cellular automaton and is computationally inexpensive. The proposed method can create various types of clouds and can also realize the animation of these clouds. Moreover, we have developed an interactive system for modeling various types of clouds.

关键词： Atmospheric modeling Clouds Fluid dynamics Computational modeling computer simulation Fires computer graphics Layout Shape Lattices

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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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