Proceedings. Computer Graphics International (Cat. No.98EX149)最新文献_第2页

Visualization of meteorological data using an interactive flight 使用交互式飞行的气象数据可视化

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694292

M. König, C. Lenz, G. Domik

引用次数: 2

Incremental techniques for implicit surface modeling 隐式曲面建模的增量技术

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694282

Eric Galin, S. Akkouche

引用次数: 5

Geometric- and parametric-tolerance constraints in variational design of multiresolution curves and surfaces 多分辨率曲线和曲面变分设计中的几何和参数公差约束

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694327

Shigeo Takahashi

{"title":"Geometric- and parametric-tolerance constraints in variational design of multiresolution curves and surfaces","authors":"Shigeo Takahashi","doi":"10.1109/CGI.1998.694327","DOIUrl":"https://doi.org/10.1109/CGI.1998.694327","url":null,"abstract":"The paper introduces constraints termed tolerance constraints, which specify several types of variations, in the design of smooth curves and surfaces at multiresolution levels. The mathematical model for such tolerance constraints is implemented by extending Welch and Witkin's (1992) work on linear constraints in variational shape sculpting. The tolerance constraints presented in this paper are classified into two types: geometric-tolerance and parametric-tolerance constraints. The geometric-tolerance constraints serve as constraints that allow variations in geometric size, while the parametric ones introduce variations in the parametric domain where the shape is defined. These two types are employed as not only finite-dimensional constraints, such as points and tangents, but also transfinite constraints, such as curves and areas. In order to find a smooth shape of a curve or a surface, the multiplier method is used that seeks to minimize the function subject the shape deformation, along with the penalty terms derived from the tolerance constraints. An optimal solution is then found easily because the derivatives of the penalty terms can be evaluated using vector and matrix calculations. Several design, examples are presented to show that the tolerance constraints are powerful tools for finding optimal shapes of multiresolution curves and surfaces.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114281873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An array processor architecture with parallel data cache for image rendering and compositing 一种具有并行数据缓存的阵列处理器架构，用于图像渲染和合成

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694294

Mladen Berekovic, P. Pirsch

引用次数: 2

Fast approximate quantitative visibility for complex scenes 快速近似定量可见的复杂场景

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694269

Y. Chrysanthou, D. Cohen-Or, Dani Lischinski

{"title":"Fast approximate quantitative visibility for complex scenes","authors":"Y. Chrysanthou, D. Cohen-Or, Dani Lischinski","doi":"10.1109/CGI.1998.694269","DOIUrl":"https://doi.org/10.1109/CGI.1998.694269","url":null,"abstract":"Ray tracing and Monte-Carlo based global illumination, as well as radiosity and other finite-element based global illumination methods, all require repeated evaluation of quantitative visibility queries, such as: what is the average visibility between a point (a differential area element) and a finite area or volume; or what is the average visibility between two finite areas or volumes. We present a new data structure and an algorithm for rapidly evaluating such queries in complex scenes. The proposed approach utilizes a novel image-based discretization of the space of bounded rays in the scene, constructed in a preprocessing stage. This data structure makes it possible to quickly compute approximate answers to visibility queries. Because visibility queries are computed using a discretization of the space, the execution time is effectively decoupled from the number of geometric primitives in the scene. A potential hazard with the proposed approach is that it might require large amounts of memory, if the data structures are designed in a naive fashion. We discuss ways for representing the discretization in a compact manner while still allowing rapid query evaluation. Preliminary results demonstrate the effectiveness of the proposed approach.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127749181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Computer visualization for the topology of integrable cases in rigid body dynamics 刚体动力学中可积情形拓扑结构的计算机可视化

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694302

A. T. Fomenko

{"title":"Computer visualization for the topology of integrable cases in rigid body dynamics","authors":"A. T. Fomenko","doi":"10.1109/CGI.1998.694302","DOIUrl":"https://doi.org/10.1109/CGI.1998.694302","url":null,"abstract":"In modern applied mathematics computer visualization is often extremely useful for solving concrete mechanical and physical problems. Some methods of topological modeling for visualization can be found, for example, in the book of T.L. Kunii and A.T. Fomenko (1997). Many problems of modern geometry and topology, mathematical physics and mechanics are reduced to the analysis of symmetries of corresponding differential equations. In cases when the group of symmetries is large, it is usually possible to integrate the differential equations, i.e. to find solutions of physical problems in a \"direct way\". The remarkable relation of this problem with topological bifurcation theory was recently discovered. It turns out that classification of dynamical systems which have \"the maximal symmetry group\" can be given in terms of one-dimensional and two-dimensional topological objects. Some of these results were obtained on the basis of computer visualization of the set of bifurcations appearing in integrable Hamiltonian systems. The author illustrates this theory by visual material showing the bifurcations in concrete dynamical systems from classical mechanics.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115079711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Visibility as an intrinsic property of geometric models 可见性是几何模型的内在属性

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694267

A. Bar-Lev, G. Elber

引用次数: 1

Visualizing 3-D geographical data with VRML 用VRML可视化三维地理数据

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694257

J. Shan

引用次数: 18

Improved triangular subdivision schemes 改进三角细分方案

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694321

H. Prautzsch, G. Umlauf

引用次数: 44

Computational metrology of the circle 圆的计算计量

Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694285

J. Pegna, C. Guo

引用次数: 1