检索结果-内蒙古大学图书馆

8th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1981

作者： Cook, Robert L. Torrance, Kenneth E. Program of Computer Graphics Cornell University IthacaNY14853 United States Sibley School of Mechanical and Aerospace Engineering Cornell University IthacaNY14853 United States

ISBN: (纸本)0897910451

This paper presents a new reflectance model for rendering computer synthesized images. The model accounts for the relative brightness of different materials and light sources in the same scene. It describes the directional distribution of the reflected light and a color shift that occurs as the reflectance changes with incidence angle. The paper presents a method for obtaining the spectral energy distribution of the light reflected from an object made of a specific real material and discusses a procedure for accurately reproducing the color associated with the spectral energy distribution. The model is applied to the simulation of a metal and a plastic. © 1981 ACM.

关键词： Reflection

来源：评论

学校读者我要写书评

暂无评论

DETERMINING A SET OF B-SPLINE CONTROL VERTICES TO GENERATE AN INTERPOLATING SURFACE

COMPUTER GRAPHICS AND IMAGE PROCESSING

引用

computer graphics AND IMAGE PROCESSING 1980年第3期14卷 203-226页

作者： BARSKY, BA GREENBERG, DP Program of Computer Graphics Cornell University Ithaca New York 14853 USA

It is desirable to be able to use the B-spline surface formulation to describe a surface initially defined by a completely specified network of points to be interpolated. An appropriate set of B-spline control vertices which will generate an interpolating surface can be determined by solving a set of simultaneous linear equations. These equations are derived, efficient algorithms are designed to solve them rapidly, and the implementation of this theory in a computer-aided geometric design system is presented.

关键词：

来源：评论

学校读者我要写书评

暂无评论

TEXTURE RENDERING SYSTEM FOR ARCHITECTURAL DESIGN

引用

computer-AIDED DESIGN 1980年第2期12卷 67-71页

作者： FEIBUSH, E GREENBERG, DP Program of Computer Graphics Cornell University Ithaca NY 14853 USA

Depicting construction materials in colour enhances the realism of synthetic images and provides the architect with a powerful design tool. A computer-aided system for creating textured renderings of architectural designs is presented. This enables the designer to organize libraries of texture samples and details extracted from digital images of colour photographs of actual materials. Furthermore, buildings can be interactively positioned on an optically scanned site background and the textures mapped to simulate any desired view of the building. The system was designed so that it could be used quickly and easily by architects with little computer experience.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Perceptual color spaces for computer graphics 80

Perceptual color spaces for computer graphics

引用

7th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1980

作者： Meyer, Gary W. Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14853 United States

ISBN: (纸本)0897910214

Perceptually uniform color spaces can be a useful tool for solving computer graphics color selection problems. However, before they can be used effectively some basic principles of tristimulus colorimetry must be understood and the color reproduction device on which they are to be used must be properly adjusted. The Munsell Book of Color and the Optical Society of America (OSA) Uniform Color Scale are two uniform color spaces which provide a useful way of organizing the colors of a digitally controlled color television monitor. The perceptual uniformity of these color spaces can be used to select color scales to encode the variations of parameters such as temperature or stress. � ACM. All rights reserved.

关键词： Color

来源：评论

学校读者我要写书评

暂无评论

Synthetic texturing using digital filters 80

Synthetic texturing using digital filters

引用

7th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1980

作者： Feibush, Eliot A. Levoy, Marc Cook, Robert L. Program of Computer Graphics Cornell University IthacaNY14853 United States

ISBN: (纸本)0897910214

Aliasing artifacts are eliminated from computer generated images of textured polygons by equivalently filtering both the texture and the edges of the polygons. Different filters can be easily compared because the weighting functions that define the shape of the filters are pre-computed and stored in lookup tables. A polygon subdivision algorithm removes the hidden surfaces so that the polygons are rendered sequentially to minimize accessing the texture definition files. An implementation of the texture rendering procedure is described. � ACM. All rights reserved.

关键词： Anti-aliasing

来源：评论

学校读者我要写书评

暂无评论

Parallel processing techniques for hidden surface removal 79

Parallel processing techniques for hidden surface removal

引用

6th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1979

作者： Kaplan, Michael Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14853 United States

ISBN: (纸本)0897910044

Previous work in the hidden-surface problem has revealed two key concepts. First, the removal of nonvisible surfaces is essentially a sorting problem. Second, some form of coherence is essential for the efficient solution of this problem. In order to provide real-time simulations, it is not only the amount of sorting which must be reduced, but the total time required for computation. One potentially economic strategy to attain this goal is the use of parallel processor systems. This approach implies that the computational time will no longer be dependent on the total amount of sorting, but more on the appropriate division of responsibility. This paper investigates two existing algorithmic approaches to the hidden-surface problem with a view towards their applicability to implementation on a parallel machine organization. In particular, the statistical results of a parallel processor implementation indicate the difficulties stemming from a loss of coherence and imply potentially important design criteria for a parallel configuration. © 1979 ACM.

关键词： Parallel processing systems

来源：评论

学校读者我要写书评

暂无评论

computer simulation of foliage shading in building energy loads 16

Computer simulation of foliage shading in building energy lo...

引用

16th Design Automation Conference, DAC 1979

作者： Schiler, Marc Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14853 United States

The calculation of building thermal loads using the computer has been an accepted practice for several years. A substantial amount of research and theoretical investigation has been expended in attempts to accurately quantify a building's thermal behavior. A number of existing simulation packages acceptably model this behavior. 1,2,3,4,5,*** advantages of simulation are obvious, not only for the predictive information with respect to operating costs or fuel consumption, but as a potential aid for preliminary design. The influence and tradeoffs of a large number of design variables such as siting, orientation, window area, thermal resistivity, surface/volume ratios, and cost can all be examined at an early stage in the design process. © 1979 Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Operating costs

来源：评论

学校读者我要写书评

暂无评论

computer Simulation of Foliage Shading in Building Energy Loads 79

Computer Simulation of Foliage Shading in Building Energy Lo...

引用

Design Automation Conference

作者： M. Schiler D.P. Greenberg Program of computer Graphics Cornell University Ithaca NY USA

The calculation of building thermal loads using the computer has been an accepted practice for several years. A substantial amount of research and theoretical investigation has been expended in attempts to accurately quantify a building's thermal behavior. A number of existing simulation packages acceptably model this behavior.1,2,3,4,5,6The advantages of simulation are obvious, not only for the predictive information with respect to operating costs or fuel consumption, but as a potential aid for preliminary design. The influence and tradeoffs of a large number of design variables such as siting, orientation, window area, thermal resistivity, surface/volume ratios, and cost can all be examined at an early stage in the design process.

关键词： computer simulation computer graphics Information analysis Computational modeling Packaging Costs Analytical models Tree graphs Thermal loading Predictive models

来源：评论

学校读者我要写书评

暂无评论

Transparency for computer synthesized images 79

Transparency for computer synthesized images

引用

6th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1979

作者： Kay, Douglas Scott Greenberg, Donald Program of Computer Graphics Cornell University United States Sundance Productions Inc. Acme Cartoon Co. Inc. 7141 Envoy Ct. DallasTX75247 United States

ISBN: (纸本)0897910044

Simple transparency algorithms which assume a linear transparency over an entire surface are the type most often employed to produce computer synthesized images of transparent objects with curved surfaces. Although most of the images created with these algorithms do give the impression of transparency, they usually do not look realistic. One of the most serious problems is that the intensity of the light that is transmitted through the objects is generally not proportional to the amount of material through which it must pass. Another problem is that the image seen behind the objects is not distorted as would naturally occur when the light is refracted as it passes through a material of different density. Use of a non-linear transparency algorithm can provide a great improvement in the realism of an image at a small additional cost. Making the transparency proportional to the normal to the surface causes it to decrease towards the edges of the surface where the path of the light through the object is longer. The exact simulation of refraction, however, requires that each sight ray be individually traced from the observer, through the picture plane and through each transparent object until an opaque surface is intersected. Since the direction of the ray would change as each material of differing optical density was entered, the hidden surface calculations required would be very time consuming. However, if a few assumptions are made about the geometry of each object and about the conditions under which they are viewed, a much simplier algorithm can be used to approximate the refractive effect. This method proceeds in a back to front order, mapping the current background image onto the next surface, until all surfaces have been considered. © 1979 ACM.

关键词： Transparency

来源：评论

学校读者我要写书评

暂无评论

Polygon shadow generation 78

Polygon shadow generation

引用

5th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1978

作者： Atherton, Peter Weiler, Kevin Greenberg, Donald Program of Computer Graphics Cornell University United States

ISBN: (纸本)9781450379083

A general purpose method for generating shadows using a polygonal coordinate data base is presented. The method is based on an object space polygon clipping hidden surface removal algorithm. Output from the program is in the same three-dimensional polygon format as the input. Thus, a shadowed data environment may be easily created and viewed from any observer position with no additional depth sorting time required for the hidden surface removal process. Shadows can also be cast by more than one light source. Since the shadows are generated in object space, the results can be used for both visual display and numerical analysis. © 1978 Association for Computing Machinery. All rights reserved.

关键词： Light sources

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：