Proceedings of the 19th annual conference on Computer graphics and interactive techniques最新文献_第2页

Predicting reflectance functions from complex surfaces 预测复杂表面的反射函数

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134075

Stephen H. Westin, J. Arvo, K. Torrance

{"title":"Predicting reflectance functions from complex surfaces","authors":"Stephen H. Westin, J. Arvo, K. Torrance","doi":"10.1145/133994.134075","DOIUrl":"https://doi.org/10.1145/133994.134075","url":null,"abstract":"We describe a physically-based Monte Carlo technique for approximating bidirectional reflectance distribution functions (BRDFs) for a large class of geometries by directly simulating optical scattering. The technique is more general than previous analytical models: it removes most restrictions on surface microgeometry. Three main points are described: a new representation of the BRDF, a Monte Carlo technique to estimate the coefficients of the representation, and the means of creating a milliscale BRDF from microscale scattering events. These allowthe prediction of scattering from essentially arbitrary roughness geometries. The BRDF is concisely represented by a matrix of spherical harmonic coefficients; the matrix is directly estimated from a geometric optics simulation, enforcing exact reciprocity. The method applies to roughness scales that are large with respect to the wavelength of light and small with respect to the spatial density at which the BRDF is sampled across the surface; examples include brushed metal and textiles. The method is validated by comparing with an existing scattering model and sample images are generated with a physically-based global illumination algorithm. CR Categories and Subject Descriptors: I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism.","PeriodicalId":196837,"journal":{"name":"Proceedings of the 19th annual conference on Computer graphics and interactive techniques","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124003439","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: 429

Surface modeling with oriented particle systems 面向粒子系统的表面建模

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134037

R. Szeliski, David Tonnesen

引用次数: 433

Interactive spacetime control for animation 交互式时空控制动画

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134083

Michael F. Cohen

{"title":"Interactive spacetime control for animation","authors":"Michael F. Cohen","doi":"10.1145/133994.134083","DOIUrl":"https://doi.org/10.1145/133994.134083","url":null,"abstract":"This paper describes new techniques to design physically based, goal directed motion of synthetic creatures. More specifically, it concentrates on developing an interactive framework for specifying constraints and objectives for the motion, and for guiding the numericrd solution of the optimization problem thus defined. The ability to define, modify and guide constrained spacetime problems is provided through an interactive user interface. Innovations that are introduced include, (1) the subdivision of spacetime into discrete pieces, or Spacetime Windows, over which subproblems can be formulated and solved, (2) the use of cubic B-spline approximation techniques to define a C2 function for the creature’s time dependent degrees of freedom, (3) the use of both symbolic and numerical processes to construct and solve the constrained optimization problem, and (4) the ability to specify inequality and conditional constraints. Creatures, in the context of this work, consist of rigid links connected by joints defining a set of generalized degrees of freedom. Hybrid symbolic and numeric techniques to solve the resulting complex constrained optimization problems are made possible by the special structure of physically based models of such creatures, and by the recent development of symbolic algebraic languages. A graphical user interface process handles communication between the user and two other processes; one devoted to symbolic differentiation and manipulation of the constraints and objectives, and one that performs the iterative numerical solution of the optimization problem. The user interface itself provides both high and low level definition of, interaction with, and inspection of, the optimization process and the resulting animation. Implementation issues and experiments with the Spacetime Windows system are discussed,","PeriodicalId":196837,"journal":{"name":"Proceedings of the 19th annual conference on Computer graphics and interactive techniques","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128912826","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: 356

Dressing animated synthetic actors with complex deformable clothes 给动画合成演员穿上复杂的可变形服装

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134017

M. Carignan, Ying Yang, N. Magnenat-Thalmann, D. Thalmann

引用次数: 334

Measuring and modeling anisotropic reflection 测量和模拟各向异性反射

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134078

G. Ward

引用次数: 1356

An importance-driven radiosity algorithm 一种重要性驱动的辐射度算法

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134080

Brian E. Smits, J. Arvo, D. Salesin

引用次数: 177

Sound rendering 声音呈现

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134063

T. Takala, J. Hahn

{"title":"Sound rendering","authors":"T. Takala, J. Hahn","doi":"10.1145/133994.134063","DOIUrl":"https://doi.org/10.1145/133994.134063","url":null,"abstract":"We present a general methodology to produce synchronized soundtracks for animations. A sound world is modeled by associating a characteristic sound for each object in a scene. These sounds can be generated from a behavioral or physically-based simulation. Collision sounds can be computed from vibrational response of elastic bodies to the collision impulse. Alternatively, stereotypic recorded sound effects can be associated with each interaction of objects. Sounds may also be generated procedurally, The sound world is described with a sound event file, and is rendered in two passes. First the propagation paths from 3D objects to each microphone are analyzed and used to calculate sound transformations according to the acoustic environment. These effects are convolutions, encoded into two essential parameters, delay and attenuation of each sound. Timeciependency of these two parameters is represented with key frames, thus being completely independent of the original 3D animation script. In the second pass the sounds associated with objects are instantiated, modulated by interpolated key parameters, and summed up to the final soundtrack. The advantage of a modular architecture is that the same methods can be used for all types of animations, keyframed, physically-based and behavioral. We also discuss the differences of sound and light, and the remarkable similarities in their rendering processes. CR","PeriodicalId":196837,"journal":{"name":"Proceedings of the 19th annual conference on Computer graphics and interactive techniques","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127154473","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: 152

Through-the-lens camera control 通过镜头相机控制

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134088

Michael Gleicher, A. Witkin

引用次数: 297

Scheduled Fourier volume morphing 预定傅里叶体积变形

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134004

J. Hughes

引用次数: 198

Pump it up: computer animation of a biomechanically based model of muscle using the finite element method 用有限元素法制作的基于生物力学的肌肉模型的电脑动画

Proceedings of the 19th annual conference on Computer graphics and interactive techniques Pub Date : 1992-07-01 DOI: 10.1145/133994.134016

David T. Chen, D. Zeltzer

引用次数: 325