Cumincad : CUMINCAD Papers : Search Results

CumInCAD is a Cumulative Index about publications in Computer Aided Architectural Design
supported by the sibling associations ACADIA, CAADRIA, eCAADe, SIGraDi, ASCAAD and CAAD futures

PDF papers
References

Hits 1 to 20 of 168

Reformat results as: short short into frame detailed detailed into frame

_id	e90b
authors	Arbab, Farhad
year	1990
title	Set Models and Boolean Operations for Solids and Assemblies
source	IEEE Computer Graphics and Applications November, 1990. vol. 10: pp. 76-86 : ill. includes bibliography.
summary	Application of solid modeling in computer-aided design, computer-aided manufacturing, and robotics often involve aggregates or assembling of disconnected pieces. This article presents an alternative CSG-like formalism based on open sets, in which both assemblies and connected pieces are modeled as points sets. Consequently, the same Boolean operations apply uniformly to connected pieces and assemblies
keywords	assemblies, CSG, solid modeling, boolean operations
series	CADline
last changed	1999/02/12 15:07

_id	afa0
authors	Aziz, N.M., Bata, R. and Sudarshan, B.
year	1990
title	Bezier Surface : Surface Intersection
source	IEEE Computer Graphics and Applications. January, 1990. vol. 10: pp. 50-58
summary	In this article the authors explain the computational requirement and accuracy of two methods for finding the intersection of Bezier surfaces. In both methods, the existence of an intersection curve is confirmed by using the convex hull property of such surfaces. The first method evaluates the intersection by recursive subdivision of two patches with overlapping hulls. The second method detects a point on the intersection curve, then incrementally traces the intersection in the parametric spaces of the two surfaces. With both methods the intersection of a pair of first-order planar patches must be solved analytically. The intersection is approximated by first-order Bezier patches in the first case, and by planar triangles in the second. Overall, the method of incremental tracing gives more accurate results than the method of recursive subdivision
keywords	recursion, curves, convex hull, curved surfaces, intersection, Bezier, triangulation
series	CADline
last changed	2003/06/02 14:42

_id	29d2
authors	Barsky, Brian A. and DeRose,Tony D.
year	1989
title	Geometric Continuity of Parametric Curves: Three Equivalent Characterizations
source	IEEE Computer Graphics and Applications. November, 1989. vol. 9: pp. 60-68 : ill. includes bibliography
summary	Geometric continuity of curves has received a good deal of research attention in recent years. The purpose of this article is to distill some of the important basic results into a self-contained presentation. The January 1990 issue of CG&M presents a paper that continues the discussion by offering applications of the theoretical background provided here
keywords	continuity, parametrization, curves, computational geometry, representation
series	CADline
last changed	2003/06/02 13:58

_id	4cf2
authors	Barsky, Brian A.
year	1990
title	Geometric Continuity of Parametric Curves : Constructions of Geometrically Continuous Splines
source	IEEE Computer Graphics and Applications. January, 1990. vol. 10: pp. 60-68 : ill
summary	This article is part two of an article published in November 1989. In the first article theoretical foundations for geometric continuity were presented. In this article the basic theory was applied to the construction of geometrically continuous spline curves
keywords	Bezier, curves, curved surfaces, splines, continuity, computational geometry, computer graphics
series	CADline
last changed	2003/06/02 13:58

_id	cc67
authors	Blinn, James F.
year	1990
title	Triage Tables
source	IEEE Computer Graphics and Applications. January, 1990. vol. 10: pp. 70-75 : ill. includes a short bibliography
summary	In this column the author presents a simple data structure to help sort lines for clipping and hidden line algorithms, borrowing from 'triage' methods of sorting victims of medical disasters: 'trivial accept,' 'trivial reject' and 'further test.'
keywords	algorithms, hidden lines, computer graphics, clipping
series	CADline
last changed	2003/06/02 13:58

_id	84c3
authors	Blinn, James F.
year	1990
title	The Ultimate Design Tool
source	IEEE Computer Graphics and Applications. November, 1990. vol. 10: pp. 90-92
summary	Paper and pen(cil)? Some thoughts on the ultimate design tool
keywords	design, computer graphics, drafting
series	CADline
last changed	2003/06/02 10:24

_id	8c66
authors	Brooks, Frederick P. Jr., Ouh-Young,Ming and Batter, James J. (et al)
year	1990
title	Project GROPE - Haptic Displays for Scientific Visualization
source	SIGGRAPH '90 Conference Proceedings August, 1990. vol. 24 ; no. 4: pp. 177-185 : ill. (some col.). includes bibliography.
summary	A project to develop a haptic and display for 6-D force fields of interacting protein molecules was began in 1967. The authors approached it in four stages: a 2-D system, a 3-D system tested with a simple task, a 6-D system tested with a simple task, and a full 6-D molecular docking system, which was the initial goal. This paper summarize the entire project, the four systems, the evaluation experiments, the results, and the authors observations
keywords	user interface, computer graphics, visualization, virtual reality
series	CADline
last changed	2003/06/02 10:24

_id	abc9
authors	Campbell, A.T. and Fussell, D.S.
year	1990
title	Adaptive Mesh Generation for Global Diffuse Illumination
source	Computer Graphics Proc. SIGGRAPH 90 Vol. 24, No. 4, Aug. 1990, pp. 155-164
summary	Rapid developments in the design of algorithms for rendering globally illuminated scenes have taken place in the past five years. Net energy methods such as the hemicube and other radiosity algorithms have become very effective a t computing the energy balance for scenes containing diffusely reflecting objects. Such methods first break up a scene description into a relatively large number of elements, or possibly sev- eral levels of elements. Energy transfers among these ele- ments are then determined using a variety of means. While much progress has been made in the design of energy transfer algorithms, little or no attention has been paid to the proper generation of the mesh of surface elements. This pa- per presents a technique for adaptively creating a mesh of surface elements as the energy transfers are computed. The method allows large numbers of small elements to be placed at parts of the scene where the most active energy trans- fers occur without requiring that other parts of the scene be needlessly subdivided to the same degree. As a result, the computational effort in the energy transfer computations can be concentrated where it has the most effect. CR Categories and Subject Descriptors: 1.3.3 [Computer Graphics]: Picture/Image Generation-Display algorithms. 1.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism. General Terms: Algorithms Additional Key Words and Phrases: global illumination, radiosity, mesh-generation, diffuse, data structure, incremental.
series	journal paper
last changed	2003/04/23 15:50

_id	caadria2011_061
id	caadria2011_061
authors	Celani, Gabriela; José P. Duarte and Carlos V. Vaz
year	2011
title	The gardens revisited: The link between technology, meaning and logic?
doi	https://doi.org/10.52842/conf.caadria.2011.643
source	Proceedings of the 16th International Conference on Computer Aided Architectural Design Research in Asia / The University of Newcastle, Australia 27-29 April 2011, pp. 643-652
summary	The objective of this paper is to compare the computational concepts present in three books published by Mitchell between 1987 and 1990: The art of computer-graphics programming (1987), which has Robin Liggett and Thomas Kvan as co-authors, The logic of architecture (1990), probably his most influential work, and The poetics of gardens (1988), which has Charles Moore and William Turnbull as coauthors. By looking at the concepts that are presented in the three books and establishing a comparison between them, we expect to show that The poetics of Gardens should not be seen as a detour from Mitchell´s line of research, but rather as a key piece for understanding the relationship between technology, meaning and logic in his very coherent body of work.
keywords	Computational design concepts; technology; meaning; logic
series	CAADRIA
email
last changed	2022/06/07 07:55

_id	2f1a
authors	Dabney, M.K., Wright, J.C. and Sanders, D.H.
year	1999
title	Virtual Reality and the Future of Publishing Archaeological Excavations: the multimedia publication of the prehistoric settlement on Tsoungiza at Ancient Nemea
source	New York: The Metropolitan Museum of Art
summary	The Nemea Valley Archaeological Project is a study of settlement and land use in a regional valley system in Greece extending from the Upper Paleolithic until the present. Active field research was conducted by four teams between 1981 and 1990. The first component was a regional archaeological survey. Second, and closely related to the first, was a social anthropological study of modern settlement and land use. Next was a team assigned to excavate the succession of prehistoric settlements of Ancient Nemea on Tsoungiza. Last, historical ecologists, a palynologist, and a geologist formed the environmental component of the research. As a result of advances in electronic publishing, plans for the final publication of the Nemea Valley Archaeological Project have evolved. Complete publication of the excavation of the prehistoric settlements of Ancient Nemea on Tsoungiza will appear in an interactive multimedia format on CD/DVD in Fall 2000. This project is planned to be the first electronic publication of the American School of Classical Studies at Athens. We have chosen to publish in electronic format because it will meet the needs and interests of a wider audience, including avocational archaeologists, advanced high school and college students, graduate students, and professional archaeologists. The multimedia format on CD/DVD will permit the inclusion of text, databases, color and black-and-white images, two and three-dimensional graphics, and videos. This publication is being developed in cooperation with Learning Sites, Inc., which specializes in interactive three-dimensional reconstructions of ancient worlds http://www.learningsites.com. The Nemea Valley Archaeological Project is particularly well prepared for the shift towards electronic publishing because the project's field records were designed for and entered in computer databases from the inception of the project. Attention to recording precise locational information for all excavated objects enables us to place reconstructions of objects in their reconstructed architectural settings. Three-dimensional images of architectural remains and associated features will appear both as excavated and as reconstructed. Viewers will be able to navigate these images through the use of virtual reality. Viewers will also be able to reference all original drawings, photographs, and descriptions of the reconstructed architecture and objects. In this way a large audience will be able to view architectural remains, artifacts, and information that are otherwise inaccessible.
series	other
last changed	2003/04/23 15:14

_id	a235
authors	Danahy, John W.
year	1990
title	Irises in a Landscape: An Experiment in Dynamic Interaction and Teaching Design Studio
source	The Electronic Design Studio: Architectural Knowledge and Media in the Computer Era [CAAD Futures ‘89 Conference Proceedings / ISBN 0-262-13254-0] Cambridge (Massachusetts / USA), 1989, pp. 363-376
summary	The capacity of most computer-aided design systems is inadequate to represent landscape architectural ideas and compute landscape scenes quickly. As part of our teaching agenda, we decided to write software for the Silicon Graphics Iris workstations to tackle this problem directly. This paper begins with a discussion of our concerns about the use of CAD tools in the representation of landscape architectural space. Secondly, we discuss the approach that Toronto takes to computing and teaching with particular emphasis on the use of computers to support an integrated representational work environment. Finally, a fourth-year design studio that used our software is reviewed. Static illustrations of the system are presented here, although there is a videotape that demonstrates the dynamic nature of the system.
series	CAAD Futures
email
last changed	2003/05/16 20:58

_id	8b27
authors	Eastman, Charles M.
year	1990
title	Vector Versus Raster : A Functional Comparison of Drawing Technologies
source	IEEE Computer Graphics and Applications. September, 1990. vol. 10: pp. 68-80 : ill. includes bibliography
summary	Raster drawing systems have emerged as an alternative to more traditional vector-based CAD drafting systems. With engineering drawing in mind, the author compares the functional capabilities of these two technologies and explores means for integrating the best features of both. The characteristics examined are not those of any particular raster or vector implementation but are derived from the underlying technologies
keywords	CAD, drawings, systems, technology, scanning, computer graphics
series	CADline
email
last changed	2003/05/17 10:15

_id	0f73
authors	Ervin, Stephen M.
year	1990
title	Designing with Diagrams: A Role for Computing in Design Education and Exploration
source	The Electronic Design Studio: Architectural Knowledge and Media in the Computer Era [CAAD Futures ‘89 Conference Proceedings / ISBN 0-262-13254-0] Cambridge (Massachusetts / USA), 1989, pp. 107-122
summary	Environmental designers, design educators and design students using computers are a constituency with a set of requirements for database structure and flexibility, for knowledge representation and inference mechanisms, and for both graphical and non-graphical operations, that are now articulatable and to-date largely unmet. This is especially so in the area called 'preliminary' or 'schematic' design, where our requirements are related to, but different from, those of our colleagues in mechanical and electrical engineering, whose needs have dominated the notable developments in this area. One manifestation of these needs is in the peculiar form of graphics called diagrams , and the ways in which environmental designers (architects, landscape architects., urban designers) use them. Our diagrams are both similar to and different from structural, circuit, or logical diagrams in important ways. These similarities and differences yield basic insights into designing and design knowledge, and provide guidance for some necessary steps in the development of the next generation of CAD systems. Diagrams as a form of knowledge representation have received little scrutiny in the literature of graphic representation and computer graphics. In the following sections I present an overview of the theoretical basis for distinguishing and using diagrams; examine some of the computational requirements for a system of computer-aided diagramming; describe a prototype implementation called CBD (Constraint Based Diagrammer) and illustrate one example of its use; and speculate on the implications and potential applications of these ideas in computer-aided design education.
series	CAAD Futures
last changed	1999/04/03 17:58

_id	db00
authors	Espina, Jane J.B.
year	2002
title	Base de datos de la arquitectura moderna de la ciudad de Maracaibo 1920-1990 [Database of the Modern Architecture of the City of Maracaibo 1920-1990]
source	SIGraDi 2002 - [Proceedings of the 6th Iberoamerican Congress of Digital Graphics] Caracas (Venezuela) 27-29 november 2002, pp. 133-139
summary	Bases de datos, Sistemas y Redes 134The purpose of this report is to present the achievements obtained in the use of the technologies of information andcommunication in the architecture, by means of the construction of a database to register the information on the modernarchitecture of the city of Maracaibo from 1920 until 1990, in reference to the constructions located in 5 of Julio, Sectorand to the most outstanding planners for its work, by means of the representation of the same ones in digital format.The objective of this investigation it was to elaborate a database for the registration of the information on the modernarchitecture in the period 1920-1990 of Maracaibo, by means of the design of an automated tool to organize the it datesrelated with the buildings, parcels and planners of the city. The investigation was carried out considering three methodologicalmoments: a) Gathering and classification of the information of the buildings and planners of the modern architectureto elaborate the databases, b) Design of the databases for the organization of the information and c) Design ofthe consultations, information, reports and the beginning menu. For the prosecution of the data files were generated inprograms attended by such computer as: AutoCAD R14 and 2000, Microsoft Word, Microsoft PowerPoint and MicrosoftAccess 2000, CorelDRAW V9.0 and Corel PHOTOPAINT V9.0.The investigation is related with the work developed in the class of Graphic Calculation II, belonging to the Departmentof Communication of the School of Architecture of the Faculty of Architecture and Design of The University of the Zulia(FADLUZ), carried out from the year 1999, using part of the obtained information of the works of the students generatedby means of the CAD systems for the representation in three dimensions of constructions with historical relevance in themodern architecture of Maracaibo, which are classified in the work of The Other City, generating different types ofisometric views, perspectives, representations photorealistics, plants and facades, among others.In what concerns to the thematic of this investigation, previous antecedents are ignored in our environment, and beingthe first time that incorporates the digital graph applied to the work carried out by the architects of “The Other City, thegenesis of the oil city of Maracaibo” carried out in the year 1994; of there the value of this research the field of thearchitecture and computer science. To point out that databases exist in the architecture field fits and of the design, alsoweb sites with information has more than enough architects and architecture works (Montagu, 1999).In The University of the Zulia, specifically in the Faculty of Architecture and Design, they have been carried out twoworks related with the thematic one of database, specifically in the years 1995 and 1996, in the first one a system wasdesigned to visualize, to classify and to analyze from the architectural point of view some historical buildings of Maracaiboand in the second an automated system of documental information was generated on the goods properties built insidethe urban area of Maracaibo. In the world environment it stands out the first database developed in Argentina, it is the database of the Modern andContemporary Architecture “Datarq 2000” elaborated by the Prof. Arturo Montagú of the University of Buenos Aires. The general objective of this work it was the use of new technologies for the prosecution in Architecture and Design (MONTAGU, Ob.cit). In the database, he intends to incorporate a complementary methodology and alternative of use of the informationthat habitually is used in the teaching of the architecture. When concluding this investigation, it was achieved: 1) analysis of projects of modern architecture, of which some form part of the historical patrimony of Maracaibo; 2) organized registrations of type text: historical, formal, space and technical data, and graph: you plant, facades, perspectives, pictures, among other, of the Moments of the Architecture of the Modernity in the city, general data and more excellent characteristics of the constructions, and general data of the Planners with their more important works, besides information on the parcels where the constructions are located, 3)construction in digital format and development of representations photorealistics of architecture projects already built. It is excellent to highlight the importance in the use of the Technologies of Information and Communication in this investigation, since it will allow to incorporate to the means digital part of the information of the modern architecturalconstructions that characterized the city of Maracaibo at the end of the XX century, and that in the last decades they have suffered changes, some of them have disappeared, destroying leaves of the modern historical patrimony of the city; therefore, the necessity arises of to register and to systematize in digital format the graphic information of those constructions. Also, to demonstrate the importance of the use of the computer and of the computer science in the representation and compression of the buildings of the modern architecture, to inclination texts, images, mapping, models in 3D and information organized in databases, and the relevance of the work from the pedagogic point of view,since it will be able to be used in the dictation of computer science classes and history in the teaching of the University studies of third level, allowing the learning with the use in new ways of transmission of the knowledge starting from the visual information on the part of the students in the elaboration of models in three dimensions or electronic scalemodels, also of the modern architecture and in a future to serve as support material for virtual recoveries of some buildings that at the present time they don’t exist or they are almost destroyed. In synthesis, the investigation will allow to know and to register the architecture of Maracaibo in this last decade, which arises under the parameters of the modernity and that through its organization and visualization in digital format, it will allow to the students, professors and interested in knowing it in a quicker and more efficient way, constituting a contribution to theteaching in the history area and calculation. Also, it can be of a lot of utility for the development of future investigation projects related with the thematic one and restoration of buildings of the modernity in Maracaibo.
keywords	database, digital format, modern architecture, model, mapping
series	SIGRADI
email
last changed	2016/03/10 09:51

_id	0544
authors	Foley, et.al.
year	1990
title	Computer Graphics Principles and Practice
source	Addison-Wesley
summary	Computer Graphics: Principles and Practice is the most exhaustive overview of computer graphics techniques available. This textbook's 21 chapters cover graphics hardware, user interface software, rendering, and a host of other subjects. Assuming a solid background in computer science or a related field, Computer Graphicsgives example programs in C and provides exercises at the end of each chapter to test your knowledge of the material. The guide has over 100 beautiful, four-color photographs that illustrate important topics and algorithms, such as ray tracing and bump maps, and also inspire you to acquire the skills necessary to produce them. Encyclopedic in its coverage, the book has a good table of contents so that you can immediately turn to information on the z-Buffer algorithm or the chapter on animation.
series	other
last changed	2003/04/23 15:14

_id	d104
authors	Foley, J.D., Van Dam A., Feiner, S.K. and Hughes, J.F.
year	1990
title	Computer Graphics, principle and practice
source	Addison-Wesley, New York
summary	Computer Graphics: Principles and Practice is the most exhaustive overview of computer graphics techniques available. This textbook's 21 chapters cover graphics hardware, user interface software, rendering, and a host of other subjects. Assuming a solid background in computer science or a related field, Computer Graphicsgives example programs in C and provides exercises at the end of each chapter to test your knowledge of the material. The guide has over 100 beautiful, four-color photographs that illustrate important topics and algorithms, such as ray tracing and bump maps, and also inspire you to acquire the skills necessary to produce them. Encyclopedic in its coverage, the book has a good table of contents so that you can immediately turn to information on the z-Buffer algorithm or the chapter on animation.
series	other
last changed	2003/04/23 15:14

_id	ab63
authors	Gross, Mark D.
year	1990
title	Relational Modeling: A Basis for Computer-Assisted Design
source	The Electronic Design Studio: Architectural Knowledge and Media in the Computer Era [CAAD Futures ‘89 Conference Proceedings / ISBN 0-262-13254-0] Cambridge (Massachusetts / USA), 1989, pp. 123-136
summary	Today's computer assisted design (CAD) systems automate traditional ways of working with tracing paper and pencil, but they cannot represent the rules and relationships of a design. As hardware becomes faster and memory less expensive, more sophisticated fundamental software technologies will be adopted. This shift in the basis of CAD will provide powerful capabilities and offer new ways to think about designing. Recently parametric design, a technique for describing a large class of designs with a small description in code, has become a focus of attention in architectural computing. In parametric CAD systems, design features are identified and keyed to a number of input variables. Changes in the input values result in variations of the basic design. Based on conventional software technologies, parametric design has been successfully applied in many design domains including architecture and is supported by several commercial CAD packages. A weakness of parametric techniques is the need to predetermine which properties are input parameters to be varied and which are to be derived. Relational modeling is a simple and powerful extension of parametric design that overcomes this weakness. By viewing relations as reversible rather than one-way, any set of properties can be chosen as input parameters. For example, a relational model that calculates the shadow length of a given building can also be used to calculate the building height given a desired shadow length. In exercising a relational model the designer is not limited to a pre-selected set of input variables but can explore and experiment freely with changes in all parts of the model. Co is a relational modeling environment under development on the Macintosh-II computer, and Co-Draw, a prototype CAD program based on Co. Co's relationaI engine and object-oriented database provide a powerful basis for modeling design relations. Co-Draw's interactive graphics offer a flexible medium for design exploration. Co provides tools for viewing and editing design models in various representations, including spreadsheet cards, tree and graph structures, as well as plan and elevation graphics. Co's concepts and architecture are described and the implications for design education are discussed.
series	CAAD Futures
email
last changed	2003/05/16 20:58

_id	4212
authors	Haeberli, Paul
year	1990
title	Paint by Numbers : Abstract Image Representations
source	Computer Graphics. August, 1990. vol. 24: pp. 207-214 : ill. includes bibliography
summary	This paper is about creating interesting abstract representations of natural and synthetic scenes. It is possible to create abstract images using an ordered collection of brush strokes. By controlling the color, shape, size, and orientation of individual brush strokes, impressionistic painting of computer generated or photographic images can be created. Several techniques are presented
keywords	computer graphics, display, algorithms, user interface, painting, representation, rendering
series	CADline
last changed	1999/02/12 15:08

_id	01ba
authors	Hyde, Richard and Boon Lay, Ong
year	1990
title	Design Problems and Evaluative Strategies Using CAAD
source	February, 1990. 16 p. : col. ill. includes bibliography
summary	The way architects design comes into sharp focus when developing strategies for evaluating buildings. Architectural design is a highly subjective activity on the one hand but on the other it is also highly objective. The paper examines the use of CAAD systems for objective evaluation while also recognizing that this kind of evaluation has to be related to the subjective aspects of the design. In order to examine this, further research has been carried out into the use of CAAD systems to evaluate sunshading characteristics in a building design problem. The approach utilized the Integraph AMOD software to generate three dimensional models of the design proposal which were then tested using the Integraph Model View software which has a sunshading facility. The utility of this approach was tested first against criteria of how accurate the computer was in giving meaningful feedback to the designer. Secondly, how productive this approach was in the design process as compared to traditional techniques using instruments such as the heliodon. Finally, a discussion of the developments of the approach is given
keywords	design, CAD, evaluation, computer graphics, applications
series	CADline
last changed	2003/06/02 10:24

_id	4b09
authors	Iwata, Hiroo
year	1990
title	Artificial Reality with Force-Feedback : Development of Desktop Virtual Space with Compact Master Manipulator
source	Computer Graphics. August, 1990. vol. 24: pp. 165-170 : ill. includes bibliography
summary	A new configuration of human interface for 'artificial reality' is discussed. The paper describes a method of implementing force-feedback in a virtual space manipulation system. The system is composed of two subsystems, a real time graphic display system and a tactile input device with reaction force generator. A specialized graphic computer (Stardent TITAN) provides a real time image of the virtual space. A 9 degree-of-freedom manipulator applies reaction forces to the fingers and palm of the operator. The generated forces are calculated from a solid model of the virtual space. The performance of the system is exemplified in manipulation of virtual solids objects such as a mockup for industrial design and a 3D animated character
keywords	user interface, virtual reality, computer graphics
series	CADline
last changed	1999/02/12 15:08

For more results click below: