Proceedings the Eighth Pacific Conference on Computer Graphics and Applications最新文献_第3页

A new adaptive density estimator for particle-tracing radiosity 一种新的自适应粒子追踪辐射密度估计方法

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883882

WongPing Wah

{"title":"A new adaptive density estimator for particle-tracing radiosity","authors":"WongPing Wah","doi":"10.1109/PCCGA.2000.883882","DOIUrl":"https://doi.org/10.1109/PCCGA.2000.883882","url":null,"abstract":"In particle-tracing radiosity algorithms, energy-carrying particles are traced through an environment for simulating global illumination. Illumination on a surface is reconstructed from particle \"hit points\" on the surface, which is a density estimation problem (B.W. Silverman, 1986). Several methods can be used to solve this problem, such as the adaptive meshing method (R.F. Tobler et al., 1997), the kernel method (B. Walter et al., 1997), and the orthogonal series estimator (M. Feda, 1996). An orthogonal series estimator is proposed to tackle the problem. In the new method, the appropriate number of terms that should be used in the series is determined adaptively and automatically. Moreover a surface subdivision scheme is combined with the estimator to increase the accuracy of estimation. The new method has several advantages over other existing methods: (1) it requires less memory than the adaptive meshing method; (2) it does not store all the particle-hit points as in the kernel method; (3) it determines automatically how many terms should be used in the orthogonal series; (4) it incorporates surface subdivision to further increase the accuracy of estimation.","PeriodicalId":342067,"journal":{"name":"Proceedings the Eighth Pacific Conference on Computer Graphics and Applications","volume":"79 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123344966","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: 2

Simulating the aurora borealis 模拟北极光

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883852

G. Baranoski, P. Shirley, J. Rokne, T. Trondsen, R. Bastos

{"title":"Simulating the aurora borealis","authors":"G. Baranoski, P. Shirley, J. Rokne, T. Trondsen, R. Bastos","doi":"10.1109/PCCGA.2000.883852","DOIUrl":"https://doi.org/10.1109/PCCGA.2000.883852","url":null,"abstract":"We present an algorithm to simulate the aurora borealis, commonly known as the \"northern lights\", a natural phenomenon of great visual beauty and considerable scientific interest. The algorithm is based on the current understanding of the physical origin of the aurora. This natural display is mainly caused by high-energy electrons originating in the Sun and entering the Earth's atmosphere in narrow regions centered on the magnetic poles. These electrons collide with atmospheric atoms which are excited to higher energy levels. The excited atoms emit rapidly varying visible light in a curtain-like volume as they return to lower energy levels thereby creating the aurora. By simulating these light emissions along with the spatial and temporal distribution of the entering electrons, we are able to render the major visual aspects of auroral displays. This approach also allows the representation of time-dependent features that characterize the dynamic nature of the aurorae. The applicability of this auroral model for artistic and research purposes is illustrated through comparisons of synthetic images with photographs of real auroral displays.","PeriodicalId":342067,"journal":{"name":"Proceedings the Eighth Pacific Conference on Computer Graphics and Applications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133996997","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: 22

Mathematical approximation for real-time lighting rendering through participating media 通过参与媒体实现实时照明渲染的数学近似

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883965

P. Lecocq, A. Kemeny, Sylvain Michelin, D. Arquès

引用次数: 13

Arbitrary precise orientation specification for layout of text 文本布局的任意精确方向规范

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883886

Tatiana Surazhsky, G. Elber

引用次数: 6

Constrained and aggregated half space volume decomposition: generating cutting patches with "internal" and "external" extending 约束聚合半空间体积分解:生成具有“内”和“外”延伸的切割斑块

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883949

Yong Lu, R. Gadh

引用次数: 0

The metric cursor 度量游标

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883962

Terii Stein, S. Coquillart

引用次数: 3

Practical texture mapping on free-form surfaces 实用的纹理映射在自由形式的表面

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883898

Yuya Iwakiri, Yuuichi Omori, T. Kaneko

引用次数: 6

Modeling an isosurface with a neural network 用神经网络建模等值面

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883938

Manuel Carcenac, A. Acan

引用次数: 2

Morphing using curves and shape interpolation techniques 变形使用曲线和形状插值技术

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883958

H. Johan, Yuichi Koiso, T. Nishita

{"title":"Morphing using curves and shape interpolation techniques","authors":"H. Johan, Yuichi Koiso, T. Nishita","doi":"10.1109/PCCGA.2000.883958","DOIUrl":"https://doi.org/10.1109/PCCGA.2000.883958","url":null,"abstract":"This paper presents solutions to the feature correspondence and feature interpolation problems in image morphing. The user specifies the correspondence between the source and the target images by drawing input curves on the features of the objects. The correspondence between these curves at the finest level (pixel level) is computed by optimizing a cost function. Based on this correspondence, the input curves are approximated by using Bezier curves. We represent the Bezier curves and the connections among them by using a \"dependency graph\". Feature interpolation is performed by interpolating the dependency graphs using the edge-angle blending technique. We also propose methods for controlling the transition rates of the shape and the color. We implemented the proposed algorithms in our morphing system which is based on the field morphing technique. From experimental results, our algorithms can generate a smooth morphing animation even when the objects in the source and the target images have different orientations. Also, the user's workload is reduced because the system includes an automatic feature correspondence computation.","PeriodicalId":342067,"journal":{"name":"Proceedings the Eighth Pacific Conference on Computer Graphics and Applications","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123752325","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: 29

Vertex data compression for triangular meshes 三角网格的顶点数据压缩

Proceedings the Eighth Pacific Conference on Computer Graphics and Applications Pub Date : 2000-10-03 DOI: 10.1109/PCCGA.2000.883945

Eung-Seok Lee, Hyeongseok Ko

引用次数: 62