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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
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_id ab9c
authors Kvan, Thomas and Kvan, Erik
year 1999
title Is Design Really Social
source International Journal of Virtual Reality, 4:1
summary There are many who will readily agree with Mitchell's assertion that "the most interesting new directions (for computer-aided design) are suggested by the growing convergence of computation and telecommunication. This allows us to treat designing not just as a technical process... but also as a social process." [Mitchell 1995]. The assumption is that design was a social process until users of computer-aided design systems were distracted into treating it as a merely technical process. Most readers will assume that this convergence must and will lead to increased communication between design participants, that better social interaction leads to be better design. The unspoken assumption appears to be that putting the participants into an environment with maximal communication channels will result in design collaboration. The tools provided, therefore, must permit the best communication and the best social interaction. We see a danger here, a pattern being repeated which may lead us into less than useful activities. As with several (popular) architectural design or modelling systems already available, however, computer system implementations all too often are poor imitations manual systems. For example, few in the field will argue with the statement that the storage of data in layers in a computer-aided drafting system is an dispensable approach. Layers derive from manual overlay drafting technology [Stitt 1984] which was regarded as an advanced (manual) production concept at the time many software engineers were specifying CAD software designs. Early implementations of CAD systems (such as RUCAPS, GDS, Computervision) avoided such data organisation, the software engineers recognising that object-based structures are more flexible, permitting greater control of data editing and display. Layer-based systems, however, are easier to implement in software, more familiar to the user and hence easier to explain, initially easier to use but more limiting for an experienced and thoughtful user, leading in the end to a lesser quality in resultant drawings and significant problems in output control (see Richens [1990], pp. 31-40 for a detailed analysis of such features and constraints). Here then we see the design for architectural software faithfully but inappropriately following manual methods. So too is there a danger of assuming that the best social interaction is that done face-to-face, therefore all collaborative design communications environments must mimic face-to-face.
series journal paper
email
last changed 2003/05/15 10:29
_id 90f7
authors Wolberg, G.
year 1990
title Digital Image Warping
source IEEE Computer Society Press
summary This best-selling, original text focuses on image reconstruction, real-time texture mapping, separable algorithms, two-pass transforms, mesh warping, and special effects. The text, containing all original material, begins with the history of the field and continues with a review of common terminology, mathematical preliminaries, and digital image acquisition. Later chapters discuss equations for spatial information, interpolation kernels, filtering problems, and fast-warping techniques based on scanline algorithms.
series journal paper
last changed 2003/04/23 15:14
_id avocaad_2001_02
id avocaad_2001_02
authors Cheng-Yuan Lin, Yu-Tung Liu
year 2001
title A digital Procedure of Building Construction: A practical project
source AVOCAAD - ADDED VALUE OF COMPUTER AIDED ARCHITECTURAL DESIGN, Nys Koenraad, Provoost Tom, Verbeke Johan, Verleye Johan (Eds.), (2001) Hogeschool voor Wetenschap en Kunst - Departement Architectuur Sint-Lucas, Campus Brussel, ISBN 80-76101-05-1
summary In earlier times in which computers have not yet been developed well, there has been some researches regarding representation using conventional media (Gombrich, 1960; Arnheim, 1970). For ancient architects, the design process was described abstractly by text (Hewitt, 1985; Cable, 1983); the process evolved from unselfconscious to conscious ways (Alexander, 1964). Till the appearance of 2D drawings, these drawings could only express abstract visual thinking and visually conceptualized vocabulary (Goldschmidt, 1999). Then with the massive use of physical models in the Renaissance, the form and space of architecture was given better precision (Millon, 1994). Researches continued their attempts to identify the nature of different design tools (Eastman and Fereshe, 1994). Simon (1981) figured out that human increasingly relies on other specialists, computational agents, and materials referred to augment their cognitive abilities. This discourse was verified by recent research on conception of design and the expression using digital technologies (McCullough, 1996; Perez-Gomez and Pelletier, 1997). While other design tools did not change as much as representation (Panofsky, 1991; Koch, 1997), the involvement of computers in conventional architecture design arouses a new design thinking of digital architecture (Liu, 1996; Krawczyk, 1997; Murray, 1997; Wertheim, 1999). The notion of the link between ideas and media is emphasized throughout various fields, such as architectural education (Radford, 2000), Internet, and restoration of historical architecture (Potier et al., 2000). Information technology is also an important tool for civil engineering projects (Choi and Ibbs, 1989). Compared with conventional design media, computers avoid some errors in the process (Zaera, 1997). However, most of the application of computers to construction is restricted to simulations in building process (Halpin, 1990). It is worth studying how to employ computer technology meaningfully to bring significant changes to concept stage during the process of building construction (Madazo, 2000; Dave, 2000) and communication (Haymaker, 2000).In architectural design, concept design was achieved through drawings and models (Mitchell, 1997), while the working drawings and even shop drawings were brewed and communicated through drawings only. However, the most effective method of shaping building elements is to build models by computer (Madrazo, 1999). With the trend of 3D visualization (Johnson and Clayton, 1998) and the difference of designing between the physical environment and virtual environment (Maher et al. 2000), we intend to study the possibilities of using digital models, in addition to drawings, as a critical media in the conceptual stage of building construction process in the near future (just as the critical role that physical models played in early design process in the Renaissance). This research is combined with two practical building projects, following the progress of construction by using digital models and animations to simulate the structural layouts of the projects. We also tried to solve the complicated and even conflicting problems in the detail and piping design process through an easily accessible and precise interface. An attempt was made to delineate the hierarchy of the elements in a single structural and constructional system, and the corresponding relations among the systems. Since building construction is often complicated and even conflicting, precision needed to complete the projects can not be based merely on 2D drawings with some imagination. The purpose of this paper is to describe all the related elements according to precision and correctness, to discuss every possibility of different thinking in design of electric-mechanical engineering, to receive feedback from the construction projects in the real world, and to compare the digital models with conventional drawings.Through the application of this research, the subtle relations between the conventional drawings and digital models can be used in the area of building construction. Moreover, a theoretical model and standard process is proposed by using conventional drawings, digital models and physical buildings. By introducing the intervention of digital media in design process of working drawings and shop drawings, there is an opportune chance to use the digital media as a prominent design tool. This study extends the use of digital model and animation from design process to construction process. However, the entire construction process involves various details and exceptions, which are not discussed in this paper. These limitations should be explored in future studies.
series AVOCAAD
email
last changed 2005/09/09 10:48
_id 04aa
authors Harfmann, Anton C. and Chen, Stuart S.
year 1990
title Building Representation within a Component Based Paradigm
source From Research to Practice [ACADIA Conference Proceedings] Big Sky (Montana - USA) 4-6 October 1990, pp. 117-127
doi https://doi.org/10.52842/conf.acadia.1990.117
summary This paper questions the use of a 2-dimensional medium to convey 3-dimensional information about design intent and proposes a computer-aided paradigm that could radically alter the way in which buildings are designed and built. The paradigm is centered about the accurate and rational representation (Rush, 86) of each individual component that makes up a building in a single, shared, computer based model. The single model approach couples the accurate physical representation of components with the accurate representation of technical information and knowledge about the assemblies of building components. It is anticipated that implementation of this approach will result in fewer communication problems that currently plague the fragmented process of practicing in the professions of architecture and engineering. The paper introduces the basic concepts within the paradigm and focuses on the development of intuitive, reasoning about the component-based design suitable for incorporation in a computer-aided setting.
series ACADIA
email
last changed 2022/06/07 07:49
_id c5bb
authors Hirschberg, U., Meister, M. and Neumann, F.
year 1993
title Processing of Geographic Data for CAAD-supported Analysis and Design of Urban Development Areas
source [eCAADe Conference Proceedings] Eindhoven (The Netherlands) 11-13 November 1993
doi https://doi.org/10.52842/conf.ecaade.1993.x.w2h
summary The interdisciplinary research project aims at the development of a hard- and software environment to support the representation, analysis, manipulation and design of urban development areas for architects and city planners. It was started in 1990 and involves three groups at the ETH Zurich: Architecture/Urban design - Processing of Geographic Data/Photogrammetry -Computer Sciences/CAAD. The first part of this paper will give an introduction to the goals and implications of the project by comparing it with a similar project one of the authors took part in as a student. Then the paper gives a brief description of the work of the three groups involved, an overview of the methods they employed and the results that were achieved. The main focus will be on the work of the CAAD group . Finally some conclusions are drawn and problems are discussed. The future work includes the testing of the tool by students during the winter term 1993/94.
series eCAADe
email
last changed 2022/06/07 07:50
_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 6259
authors Kalay, Yehuda E. and Majkowski, Bruce R.
year 1990
title CAD Technology Transfer: A Case Study
source From Research to Practice [ACADIA Conference Proceedings] Big Sky (Montana - USA) 4-6 October 1990, pp. 133-143
doi https://doi.org/10.52842/conf.acadia.1990.133
summary Transferring innovative university-based research results to the industry or practice that will ultimately use them is an arduous, time-consuming effort. One way to effect this technology transfer is to develop a demonstrable prototype product and then find or form a corporation that can expand the prototype into a full product and market it to the profession. Another way, which can shorten the transfer process, is to "sell" the idea, rather than the product, to a corporation that has the vision, the resources and the technical competency to support its development, with the intent to eventually market it. In this paper, we describe a case study of this latter approach, based on our seven year experience of researching, developing and transferring innovative architectural CAD technology. We describe the birth, growth, and maturity of Worldview, a computer-aided design and modeling system for use by architects. The project was initiated in 1983, and went through five software versions, numerous grants and grant extensions, two granting corporations, and extensive field testing. The software has developed into a mature system, with sufficient functionality appropriate for commercial distribution. The paper describes not only the factual chronology of the project, but also highlights the advantages and drawbacks of market-oriented university research. We conclude with suggestions as to how the process may be improved, and how problems and obstacles can be minimized.
series ACADIA
email
last changed 2022/06/07 07:52
_id 8833
authors Kalay, Yehuda E., Swerdloff, Lucien M. and Majkowski, Bruce R. (et al)
year 1990
title Process and Knowledge in Design Computation
source Journal of Architectural Education. February, 1990. includes bibliography
summary The challenge of understanding the many facets of design has been a central issue in attempting to computationally define design processes and knowledge. The historical progression of computers in design has been characterized by high aspirations repeatedly humbled by the complexity of design problems. Fundamental questions concerning the role and impact of computers in design should be re-examined in light of new developments in Computer-Aided Design (CAD) and Artificial Intelligence (AI), and the progressive understanding of design itself. At the heart of these issues must lie a mutual understanding of the respective traits of design and computation, and the balance of interaction between them. In this paper two avenues, expressed in terms of mappings between design and computation, are explored with the intention of clarifying the relationship between the theories of design and computation. First, the relationship between models of the design process and computational search strategies is explored. Several paradigms (problem solving, puzzle making, and constraint satisfying), which demonstrate a breadth of approaches to modeling design, are presented along with their computational implications. Second, relationships between design knowledge and computational representation schemes are discussed. Emphasis is placed on drawing from cognitive and computational knowledge representation schemes to represent design knowledge. Finally, some thoughts on integrating these design models and knowledge representation schemes into computer systems to assist designers are discussed
keywords design process, knowledge, representation, architecture
series CADline
email
last changed 2003/06/02 13:58
_id cf2011_p093
id cf2011_p093
authors Nguyen, Thi Lan Truc; Tan Beng Kiang
year 2011
title Understanding Shared Space for Informal Interaction among Geographically Distributed Teams
source Computer Aided Architectural Design Futures 2011 [Proceedings of the 14th International Conference on Computer Aided Architectural Design Futures / ISBN 9782874561429] Liege (Belgium) 4-8 July 2011, pp. 41-54.
summary In a design project, much creative work is done in teams, thus requires spaces for collaborative works such as conference rooms, project rooms and chill-out areas. These spaces are designed to provide an atmosphere conducive to discussion and communication ranging from formal meetings to informal communication. According to Kraut et al (E.Kraut et al., 1990), informal communication is an important factor for the success of collaboration and is defined as “conversations take place at the time, with the participants, and about the topics at hand. It often occurs spontaneously by chance and in face-to-face manner. As shown in many research, much of good and creative ideas originate from impromptu meeting rather than in a formal meeting (Grajewski, 1993, A.Isaacs et al., 1997). Therefore, the places for informal communication are taken into account in workplace design and scattered throughout the building in order to stimulate face-to-face interaction, especially serendipitous communication among different groups across disciplines such as engineering, technology, design and so forth. Nowadays, team members of a project are not confined to people working in one location but are spread widely with geographically distributed collaborations. Being separated by long physical distance, informal interaction by chance is impossible since people are not co-located. In order to maintain the benefit of informal interaction in collaborative works, research endeavor has developed a variety ways to shorten the physical distance and bring people together in one shared space. Technologies to support informal interaction at a distance include video-based technologies, virtual reality technologies, location-based technologies and ubiquitous technologies. These technologies facilitate people to stay aware of other’s availability in distributed environment and to socialize and interact in a multi-users virtual environment. Each type of applications supports informal interaction through the employed technology characteristics. One of the conditions for promoting frequent and impromptu face-to-face communication is being co-located in one space in which the spatial settings play as catalyst to increase the likelihood for frequent encounter. Therefore, this paper analyses the degree to which sense of shared space is supported by these technical approaches. This analysis helps to identify the trade-off features of each shared space technology and its current problems. A taxonomy of shared space is introduced based on three types of shared space technologies for supporting informal interaction. These types are named as shared physical environments, collaborative virtual environments and mixed reality environments and are ordered increasingly towards the reality of sense of shared space. Based on the problem learnt from other technical approaches and the nature of informal interaction, this paper proposes physical-virtual shared space for supporting intended and opportunistic informal interaction. The shared space will be created by augmenting a 3D collaborative virtual environment (CVE) with real world scene at the virtual world side; and blending the CVE scene to the physical settings at the real world side. Given this, the two spaces are merged into one global structure. With augmented view of the real world, geographically distributed co-workers who populate the 3D CVE are facilitated to encounter and interact with their real world counterparts in a meaningful and natural manner.
keywords shared space, collaborative virtual environment, informal interaction, intended interaction, opportunistic interaction
series CAAD Futures
email
last changed 2012/02/11 19:21
_id 0565
authors Oxman, Robert and Oxman, Rivka
year 1990
title The Computability of Architectural Knowledge
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. 171-185
summary In an important contribution to the theoretical foundation of design computing, Mitchell noted "an increasingly urgent need to establish a demonstrably sound, comprehensive, rigorously formalized theoretical foundation upon which to base practical software development efforts" (Mitchell, 1986). In this paper we propose such a theoretical framework. A basic assumption of this work is that the advancement of design computing is dependent upon the emergence of a rigorous formulation of knowledge in design. We present a model of knowledge in architectural design which suggests a promising conceptual basis for dealing with knowledge in computer-aided design systems. We require models which can represent the formal knowledge and manipulative operations of the designer in all of their complexity-that is formal models rather than just geometric models. Shape Grammars (Stiny,1980) represent an example of such models, and constitute a relatively high level of design knowledge as compared to, for example, use of symmetry operations to generate simple formal configurations. Building upon an understanding of the classes of design knowledge as the conceptual basis for formal modeling systems may contribute a new realization of the potential of the medium for design. This will require a comprehensive approach to the definition of architectural and design knowledge. We consider here the implications of a well-defined body of architectural and design knowledge for design education and the potential mutual interaction-in a knowledge-rich environment-of design learning and CAAD learning. The computational factors connected with the representation of design knowledge and its integration in design systems are among the key problems of CAAD. Mitchell's model of knowledge in design incorporates formal knowledge in a comprehensive, multi-level, hierarchical structure in which types of knowledge are correlated with computational concepts. In the main focus of this paper we present a structured, multi-level model of design knowledge which we discuss with respect to current architectural theoretical considerations. Finally, we analyze the computational and educational relevance of such models.
series CAAD Futures
email
last changed 2003/05/16 20:58
_id 4ec7
authors Papper, Mike
year 1990
title Using high-level constraints to aid space planning applications in computer-aided design
source University of Toronto, Department of Computer Science
summary This thesis describes a system that aids in solving space planning and layout design problems through an innovative use of constraints. Space planning problem solving is aided by constrained manipulation, a trial-and-error approach, and modelling the scaling properties of objects. Constraints are used to model various physical properties of solid objects (including gravity and friction) and to control the way in which objects scale. The system runs on a Silicon Graphics workstation supporting interactive, real-time, 3-dimensional graphics that aid in visualizing designs. The problems handled by our prototype are restricted to objects representable with rectangular solids oriented along the cartesian axes. This system was used by designers and novice computer users to solve a studio layout problem. Constraints were found to aid in the manipulation of objects by providing predictable behaviour for objects. The test results indicate that subjects learn the behaviour of objects easily and use this information in useful ways. In addition, there are indications that constraints can reduce users' cognitive loads at the user interface level. The coupling of constraints with the interactive, 3-dimensional aspect of the system encourages the use of the system at earlier stages of the design process than simple geometric drafting systems. (Abstract shortened by UMI.)
series thesis:MSc
email
last changed 2003/02/12 22:37
_id c12b
authors Sakr, Yasser H. and Johnson, Robert E.
year 1991
title Computer-Aided Architectural Design Strategies: One Size Does Not Fit All
source Reality and Virtual Reality [ACADIA Conference Proceedings / ISBN 1-880250-00-4] Los Angeles (California - USA) October 1991, pp. 15-31
doi https://doi.org/10.52842/conf.acadia.1991.015
summary The practice of architecture is in the midst of significant change and an increasingly uncertain future. Socio-economic factors external to the profession are forcing firms to develop new strategies for delivering design services. Overlaying these external changes is the uncertainty resulting from the inevitable introduction of information technology, which is only beginning to have an impact on the profession. Some advocates see the emergence of a new form of design firm -the computerized design firm - as an intelligent organization structured around electronic work groups with powerful computation and communications tools (Catalano 1990). On the other hand, many practitioners still see CADD as an expensive technology whose primary result leads to an increase in overhead costs. But some practitioners and researchers (Coyne, 1991) recognize both the potential and, problems that computer-aided design presents to the profession. This research presents a framework for understanding how changing information technology might be appropriately integrated into the design firm. It argues that design is an increasingly diverse enterprise, and that this diversity must be understood in order to effectively integrate information technology. The study is divided into three sections. The first section develops an overview of major social, economic, and structural changes within the profession. The second section discusses two alternative approaches that have been utilized to integrate information technology into firms. The third part presents a framework for understanding how information technology may have an impact on strategies for structuring and organizing architectural firms.
series ACADIA
last changed 2022/06/07 07:56
_id avocaad_2001_20
id avocaad_2001_20
authors Shen-Kai Tang
year 2001
title Toward a procedure of computer simulation in the restoration of historical architecture
source AVOCAAD - ADDED VALUE OF COMPUTER AIDED ARCHITECTURAL DESIGN, Nys Koenraad, Provoost Tom, Verbeke Johan, Verleye Johan (Eds.), (2001) Hogeschool voor Wetenschap en Kunst - Departement Architectuur Sint-Lucas, Campus Brussel, ISBN 80-76101-05-1
summary In the field of architectural design, “visualization¨ generally refers to some media, communicating and representing the idea of designers, such as ordinary drafts, maps, perspectives, photos and physical models, etc. (Rahman, 1992; Susan, 2000). The main reason why we adopt visualization is that it enables us to understand clearly and to control complicated procedures (Gombrich, 1990). Secondly, the way we get design knowledge is more from the published visualized images and less from personal experiences (Evans, 1989). Thus the importance of the representation of visualization is manifested.Due to the developments of computer technology in recent years, various computer aided design system are invented and used in a great amount, such as image processing, computer graphic, computer modeling/rendering, animation, multimedia, virtual reality and collaboration, etc. (Lawson, 1995; Liu, 1996). The conventional media are greatly replaced by computer media, and the visualization is further brought into the computerized stage. The procedure of visual impact analysis and assessment (VIAA), addressed by Rahman (1992), is renewed and amended for the intervention of computer (Liu, 2000). Based on the procedures above, a great amount of applied researches are proceeded. Therefore it is evident that the computer visualization is helpful to the discussion and evaluation during the design process (Hall, 1988, 1990, 1992, 1995, 1996, 1997, 1998; Liu, 1997; Sasada, 1986, 1988, 1990, 1993, 1997, 1998). In addition to the process of architectural design, the computer visualization is also applied to the subject of construction, which is repeatedly amended and corrected by the images of computer simulation (Liu, 2000). Potier (2000) probes into the contextual research and restoration of historical architecture by the technology of computer simulation before the practical restoration is constructed. In this way he established a communicative mode among archeologists, architects via computer media.In the research of restoration and preservation of historical architecture in Taiwan, many scholars have been devoted into the studies of historical contextual criticism (Shi, 1988, 1990, 1991, 1992, 1995; Fu, 1995, 1997; Chiu, 2000). Clues that accompany the historical contextual criticism (such as oral information, writings, photographs, pictures, etc.) help to explore the construction and the procedure of restoration (Hung, 1995), and serve as an aid to the studies of the usage and durability of the materials in the restoration of historical architecture (Dasser, 1990; Wang, 1998). Many clues are lost, because historical architecture is often age-old (Hung, 1995). Under the circumstance, restoration of historical architecture can only be proceeded by restricted pictures, written data and oral information (Shi, 1989). Therefore, computer simulation is employed by scholars to simulate the condition of historical architecture with restricted information after restoration (Potier, 2000). Yet this is only the early stage of computer-aid restoration. The focus of the paper aims at exploring that whether visual simulation of computer can help to investigate the practice of restoration and the estimation and evaluation after restoration.By exploring the restoration of historical architecture (taking the Gigi Train Station destroyed by the earthquake in last September as the operating example), this study aims to establish a complete work on computer visualization, including the concept of restoration, the practice of restoration, and the estimation and evaluation of restoration.This research is to simulate the process of restoration by computer simulation based on visualized media (restricted pictures, restricted written data and restricted oral information) and the specialized experience of historical architects (Potier, 2000). During the process of practicing, communicates with craftsmen repeatedly with some simulated alternatives, and makes the result as the foundation of evaluating and adjusting the simulating process and outcome. In this way we address a suitable and complete process of computer visualization for historical architecture.The significance of this paper is that we are able to control every detail more exactly, and then prevent possible problems during the process of restoration of historical architecture.
series AVOCAAD
email
last changed 2005/09/09 10:48
_id 8a0c
authors Tan, Milton
year 1990
title Saying What It Is by What It Is Like - Describing Shapes Using Line Relationships
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. 201-213
summary Shapes - taken as well-defined collections of lines - are fundamental building blocks in architectural drawings. From doodles to shop drawings, shapes are used to denote ideas and represent elements of design, many of which ultimately translate into actual objects. But because designs evolve, the shapes representing a design are seldom static - instead, they are perpetually open to transformations. And since transformations involve relationships, conventional methods of describing shapes as sets of discrete endpoints may not provide an appropriate foundation for schematic design. This paper begins with a review of the perception of shapes and its significance in design. In particular, it argues that juxtapositions and inter-relationships of shapes are important seedbeds for creative development of designs. It is clear that conventional representation of shapes as sets of discrete lines does not cope with these -emergent" subshapes; the most basic of which arise out of intersecting and colinear lines. Attempts to redress this by using ‘reduction rules’ based on traditional point-and-line data structures are encumbered by computational problems of precision and shape specification. Basically, this means that some ‘close’ cases of sub-shapes may escape detection and their specifications are difficult to use in substitution operations. The paper presents the findings of a computer project - Emergence II - which explored a 'relational' description of shapes based on the concept of construction lines. It builds on the notion that architectural shapes are constructed in a graphic context and that, at a basic compositional level, the context can be set by construction lines. Accordingly, the interface enables the delineation of line segments with reference to pre-established construction lines. This results in a simple data structure where the knowledge of shapes is centralized in a lookup table of all its construction lines rather than dispersed in the specifications of line segments. Taking this approach, the prototype software shows the ease and efficiency of applying ‘reduction rules’ for intersection and colinear conditions, and for finding emergent sub-shapes by simply tracking the construction lines delimiting the ends of line segments.
series CAAD Futures
email
last changed 2003/05/16 20:58
_id fbeb
authors Witkin, A., Kass, M., Terzopoulos, D. and Barr, A.
year 1990
title Linking perception and graphics: modeling with dynamic constraints
source Barlow, H., Blackemore, C. and Weston-Smith, M. (eds), Images and understanding, Cambridge University Press, Cambridge, pp. 213-226
summary Images and Understanding Thoughts about Images: Ideas about Understanding How do you paint a picture of infinity? How do you dance about death? How do you draw a diagram explaining entropy? Images and Understanding explores the human problem of moving facts and ideas from one mind to another - the problems of how we see and communicate using images expressed in pictures, diagrams, words, music and dance. For artists as well as scientists discussion of this topic is timely; electronic and computing technology is expanding the means of generating and communicating images, while physiology and psychology are revealing the neural mechanisms of coding, perceiving and understanding them. The book is divided into six sections, each with an explanatory introduction followed by comprehensively illustrated contributions from internationally distinguished figures from fields as diverse as art history, choreography, psychology, computer science, and philosophy. Images and Understanding is unique in viewing the problems of imagery through the eyes of both science and art; it gives new insight into images and new ideas about understanding. Contributors
series other
last changed 2003/04/23 15:14
_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 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 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 6c14
authors Fujimoto, Richard M.
year 1990
title Parallel Discrete Event Simulation
source Communications of the ACM. October, 1990. vol. 33: pp. 31-53. includes bibliography
summary Parallel discrete event simulation (PDES), sometimes called distributed simulation, refers to the execution of a single discrete event simulation program on a parallel computer. This article deals with the execution of a simulation program on a parallel computer by decomposing the simulation application into a set of concurrently executing process. It Surveys existing approaches, analyzed the merits and drawbacks of various techniques
keywords algorithms, simulation, theory, parallel processing
series CADline
last changed 2003/06/02 13:58

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