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A Stratified Sampling Technique for an Ellipse 椭圆的分层抽样技术
Journal of Graphics Tools Pub Date : 2004-01-01 DOI: 10.1080/10867651.2004.10487595
Chung-Ming Wang, N. Hwang
{"title":"A Stratified Sampling Technique for an Ellipse","authors":"Chung-Ming Wang, N. Hwang","doi":"10.1080/10867651.2004.10487595","DOIUrl":"https://doi.org/10.1080/10867651.2004.10487595","url":null,"abstract":"Abstract We present an efficient stratified sampling technique for an ellipse. Our technique provides extensions of pre vious work for sampling a disk with lowdistortion; it works for both polar and concentric maps between a square and an ellipse. The mapping preserves adjacency and fractional area, and does not require any numerical computation. As in the previous work, the concentric map demonstrates better performance. Our technique has proven useful in realistic image synthesis using Monte Carlo direct lighting and Monte Carlo path tracing. In conclusion, the proposed technique is stratified, efficient, and feasible for the computer graphics community. Source code is available online.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"3 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120981266","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: 3
Improving the Reliability/Cost Ratio of Goniophotometric Comparisons 提高角质层光学比较的可靠性/成本比
Journal of Graphics Tools Pub Date : 2004-01-01 DOI: 10.1080/10867651.2004.10504894
A. Krishnaswamy, G. Baranoski, J. Rokne
{"title":"Improving the Reliability/Cost Ratio of Goniophotometric Comparisons","authors":"A. Krishnaswamy, G. Baranoski, J. Rokne","doi":"10.1080/10867651.2004.10504894","DOIUrl":"https://doi.org/10.1080/10867651.2004.10504894","url":null,"abstract":"Abstract Many scattering models have been presented in the graphics literature. Few of them, however, have been evaluated through comparisons with real measured data. As the demand for plausible and predictable scattering models increases, more attention is given to performing such comparisons. In this paper, we examine the implementation of virtual goniphotometers used to obtain BRDF (Bidirectional Reflect ance Distribution Function) and BTDF (Bidirectional Transmittance Distribution Function) records from algorithmic scattering models. These records can be compared to data from actual experiments in order to validate the models. Our discussion focuses on practical issues, namely the subdivision of the devices' collector sphere and the ray density required to obtain reliable BRD F and BTDF estimates. The subdivision techniques examined in this paper have been used before in publications, but the details of their computation are not readily available in the literature. Although the mathematical bound presented to determine appropriate ray densities for virtua l goniphotometers is a direct generalization of a bound used for virtual spectrophotometers, it has not been published be fore. Our discussion of these issues is supported by practical experiments whose results are also provided in this paper.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123028933","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: 14
Perceptual Metric for Production Testing 生产测试的感知度量
Journal of Graphics Tools Pub Date : 2004-01-01 DOI: 10.1080/10867651.2004.10504900
H. Yee
{"title":"Perceptual Metric for Production Testing","authors":"H. Yee","doi":"10.1080/10867651.2004.10504900","DOIUrl":"https://doi.org/10.1080/10867651.2004.10504900","url":null,"abstract":"Abstract This paper describes a perceptually based image comparison processtliat can be used to tell when images are perceptually identical even though they contain imperceptible numerical differences. The technique has shown much utility in the production testing of rendering software.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116968629","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
Automatic Differentiation, C++ Templates, and Photogrammetry 自动区分，c++模板和摄影测量
Journal of Graphics Tools Pub Date : 2004-01-01 DOI: 10.1080/10867651.2004.10504901
Dan Piponi
{"title":"Automatic Differentiation, C++ Templates, and Photogrammetry","authors":"Dan Piponi","doi":"10.1080/10867651.2004.10504901","DOIUrl":"https://doi.org/10.1080/10867651.2004.10504901","url":null,"abstract":"Abstract Differential calculus is ubiquitous in digital movie production. We give a novel presentation of automatic differentiation, a method for computing derivatives of functions, that is not well known within the graphics community, and describe some applications of this method. In particular we describe the implementation of a photogrammetric reconstruction tool used on the post-production of Matrix Reloaded and Matrix Revolutions that was built using automatic differentiation.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120892279","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: 45
Controlled Texture Pushing and Crossing Seams in UV Space Using Maya and Photorealistic Renderman 使用Maya和Photorealistic Renderman在UV空间中控制纹理推动和交叉接缝
Journal of Graphics Tools Pub Date : 2004-01-01 DOI: 10.1080/10867651.2004.10504902
B. Andersen, Kevin Noone
{"title":"Controlled Texture Pushing and Crossing Seams in UV Space Using Maya and Photorealistic Renderman","authors":"B. Andersen, Kevin Noone","doi":"10.1080/10867651.2004.10504902","DOIUrl":"https://doi.org/10.1080/10867651.2004.10504902","url":null,"abstract":"Abstract This paper explores the methods used to warp the skin around the transition from the shape-shifting character in X-Men 2, Mystique, using Photorealistic Renderman. We begin by extrapolating a two-channel vector map from the single-channel texture map that was used to drive Mystique's transition. We show how to use the vector maps to warp the texture across borders in separate UV spaces. Finally, we show how to solve the problem of antialiasing across the separate UV spaces.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124288175","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: 4
Fast Ray-Axis Aligned Bounding Box Overlap Tests with Plucker Coordinates 使用拔毛器坐标的快速射线轴对齐边界框重叠测试
Journal of Graphics Tools Pub Date : 2004-01-01 DOI: 10.1080/10867651.2004.10487597
J. Mahovsky, B. Wyvill
{"title":"Fast Ray-Axis Aligned Bounding Box Overlap Tests with Plucker Coordinates","authors":"J. Mahovsky, B. Wyvill","doi":"10.1080/10867651.2004.10487597","DOIUrl":"https://doi.org/10.1080/10867651.2004.10487597","url":null,"abstract":"Abstract Fast ray-axis aligned bounding box overlap tests can be performed by utilizing Pliicker coordinates. This method tests the ray against the edges comprising the silhouette of the box instead of testing against individual faces. Projection of the edges onto a two-dimensional plane to generate the silhouette is not necessary, which simplifies the technique. The method is division-free and successive calculations are independent and consist simply of dot product operations, which permits vectorization. The method does not compute an intersection distance along the ray to the box, but this can be added as an additional step. Storage of Pliicker coordinates is unnecessary, permitting integration into existing systems. Test results show the technique's performance is up to 93% faster than traditional methods if an intersection distance is not needed.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"50 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120982824","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: 48
Maya™ Assets: A Shot Content Management System 玛雅™资产:一个镜头内容管理系统
Journal of Graphics Tools Pub Date : 2004-01-01 DOI: 10.1080/10867651.2004.10504899
Greg Brentin, Gregory Heflin
{"title":"Maya™ Assets: A Shot Content Management System","authors":"Greg Brentin, Gregory Heflin","doi":"10.1080/10867651.2004.10504899","DOIUrl":"https://doi.org/10.1080/10867651.2004.10504899","url":null,"abstract":"Abstract Systems for effective management of shot content data are critical to the support of any large-scale digital production. In regards to the data's structure, there are a variety of advantages in maintaining and managing data in a granular form, as a collection of separable data assets. Two key abilities afforded through data management in a granular form are 1) an ability to selectively load a subset of shot assets for improved performance with a reduced memory footprint, and 2) an ability to selectively lock a subset of shot assets enabling parallel shot work by multiple artists. Both translate directly into improved artist and production pipeline efficiencies. Maya's built-in file-referencing mechanism provides a small step towards enabling finer grain data management, but falls short in enabling either of the potential key advantages outlined above. The Maya Assets system was developed at DreamWorks Animation, Inc. in support of these capabilities and other such efficiency improvements. The system was initially developed and deployed as the foundation of the Maya-based pipeline for the feature film Sinbad: Legend of the Seven Seas.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124447101","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
CAB: Fast Update of aBB Trees for Coil ision Detection Between Articulated Bodies CAB:用于铰接体之间线圈视觉检测的快速更新aBB树
Journal of Graphics Tools Pub Date : 2004-01-01 DOI: 10.1080/10867651.2004.10504891
H. Schmidl, Nolan Walker, M. Lin
{"title":"CAB: Fast Update of aBB Trees for Coil ision Detection Between Articulated Bodies","authors":"H. Schmidl, Nolan Walker, M. Lin","doi":"10.1080/10867651.2004.10504891","DOIUrl":"https://doi.org/10.1080/10867651.2004.10504891","url":null,"abstract":"Abstract We present a new, fast approach for updating oriented bounding box hierarchies for articulated humanoid models, using a bottom-up approach. The algorithm approximates existing techniques by assuming a major body axis. Existence of a major axis allows merging of bounding boxes in a hierarchy approximately but with sufficient accuracy. For scenarios with close proximity, a speed-up by a factor 2 on average is achieved compared to existing techniques.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124926831","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: 17
Arbitrary-Degree Subdivision with Creases and Attributes 具有折痕和属性的任意度细分
Journal of Graphics Tools Pub Date : 2004-01-01 DOI: 10.1080/10867651.2004.10504898
I. Stewart, A. Foisy
{"title":"Arbitrary-Degree Subdivision with Creases and Attributes","authors":"I. Stewart, A. Foisy","doi":"10.1080/10867651.2004.10504898","DOIUrl":"https://doi.org/10.1080/10867651.2004.10504898","url":null,"abstract":"Abstract We introduce a new subdivision schème that can be used to generate limit surfaces of either odd or even, degree. The scheme, which requires only linear subdivision and local smoothing operations, differs from existing evendegree schemes in that it is able to correctly propagate attributes such as texturecoordinates or polygon colors to intermediate meshes without introducing errors. The new approach also permits the use of creases on even-degree surfaces, in a similar fashion to current odd-degree methods. The new scheme also permits the generation of surfaces that interpolate between limit-surfaces of different degrees. In addition, the target limit-surface degree can be specified to vary over the input mesh; the algorithm smoothly interpolates between regions of differing degree. As a result, artists have more flexible tools for controlling the limit-surface shape.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125791346","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: 10
A Procedural Thread Texture Model 一个过程线程纹理模型
Journal of Graphics Tools Pub Date : 2003-01-01 DOI: 10.1080/10867651.2003.10487588
Neeharika Adabala, N. Magnenat-Thalmann
{"title":"A Procedural Thread Texture Model","authors":"Neeharika Adabala, N. Magnenat-Thalmann","doi":"10.1080/10867651.2003.10487588","DOIUrl":"https://doi.org/10.1080/10867651.2003.10487588","url":null,"abstract":"Abstract We present a technique for procedurally creating the texture of the twists of thread. The procedure is designed to support variations in appearance due to tightness of twist, thickness of the bundles twisted together, and the roughness of the fibers. The procedural texture of the twist is further shaded to give it the appearance of a typical facet of thread that is visible on woven clothes. We demonstrate the utility of the texture by using it to synthesize texture of woven textiles.","PeriodicalId":318334,"journal":{"name":"Journal of Graphics Tools","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122617842","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: 17
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