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

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_id	46c7
id	46c7
authors	Ozel, Filiz
year	1992
title	Data Modeling Needs of Life Safety Code (LSC) Compliance Applications
doi	https://doi.org/10.52842/conf.acadia.1992.177
source	Mission - Method - Madness [ACADIA Conference Proceedings / ISBN 1-880250-01-2] 1992, pp. 177-185
summary	One of the most complex code compliance issues originates from the conformance of designs to Life Safety Code (NFPA 101). The development of computer based code compliance checking programs attracted the attention of building researchers and practitioners alike. These studies represent a number of approaches ranging from CAD based procedural approaches to rule based, non graphic ones, but they do not address the interaction of the rule base of such systems with graphic data bases that define the geometry of architectural objects. Automatic extraction of the attributes and the configuration of building systems requires 11 architectural object - graphic entity" data models that allow access and retrieval of the necessary data for code compliance checking. This study aims to specifically focus on the development of such a data model through the use of AutoLISP feature of AutoCAD (Autodesk Inc.) graphic system. This data model is intended to interact with a Life Safety Code rule base created through Level5-Object (Focus Inc.) expert system. Assuming the availability of a more general building data model, one must define life and fire safety features of a building before any automatic checking can be performed. Object oriented data structures are beginning to be applied to design objects, since they allow the type versatility demanded by design applications. As one generates a functional view of the main data model, the software user must provide domain specific information. A functional view is defined as the process of generating domain specific data structures from a more general purpose data model, such as defining egress routes from wall or room object data structure. Typically in the early design phase of a project, these are related to the emergency egress design features of a building. Certain decisions such as where to provide sprinkler protection or the location of protected egress ways must be made early in the process.
series	ACADIA
email
last changed	2022/06/07 08:00

_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	3ff5
authors	Abbo, I.A., La Scalea, L., Otero, E. and Castaneda, L.
year	1992
title	Full-Scale Simulations as Tool for Developing Spatial Design Ability
source	Proceedings of the 4rd European Full-Scale Modelling Conference / Lausanne (Switzerland) 9-12 September 1992, Part C, pp. 7-10
summary	Spatial Design Ability has been defined as the capability to anticipate effects (psychological impressions on potential observers or users) produced by mental manipulation of elements of architectural or urban spaces. This ability, of great importance in choosing the appropriate option during the design process, is not specifically developed in schools of architecture and is partially obtained as a by-product of drawing, designing or architectural criticism. We use our Laboratory as a tool to present spaces to people so that they can evaluate them. By means of a series of exercises, students confront their anticipations with the psychological impressions produced in other people. For this occasion, we present an experience in which students had to propose a space for an exhibition hag in which architectural projects (student thesis) were to be shown. Following the Spatial Design Ability Development Model which we have been using for several years, students first get acquainted with the use of evaluation instruments for psychological impressions as well as with research methodology. In this case, due to the short period available, we reduced research to investigate the effects produced by the manipulation of only 2 independents variables: students manipulated first the form of the roof, walls and interiors elements, secondly, color and texture of those elements. They evaluated spatial quality, character and the other psychological impressions that manipulations produced in people. They used three dimensional scale models 1/10 and 1/1.
keywords	Full-scale Modeling, Model Simulation, Real Environments
series	other
email
more	http://info.tuwien.ac.at/efa
last changed	2003/08/25 10:12

_id	b602
authors	Bosselmann, P.
year	1992
title	Visual Simulation in Urban Design
source	Institute of Urban and Regional Development, University of California at Berkeley Working Paper No. 587, pp. 1-15
summary	Contributed by Susan Pietsch (spietsch@arch.adelaide.edu.au)
keywords	3D City Modeling, Development Control, Design Control
series	other
last changed	2001/06/04 20:27

_id	9092
authors	Martens, Bob
year	1992
title	TOOLS FOR VISUAL SIMULATION OF SPACE AND THEIR USE BY STUDENTS
source	Proceedings of the 4rd European Full-Scale Modelling Conference / Lausanne (Switzerland) 9-12 September 1992, Part B, pp. 33-38
summary	Most visual representations of architectural space are still done using drawings of ground plan, section and view. Yet, when experience is lacking - as with students or laypeople - these two-dimensional representations hardly show their correspondence to a three-dimensional reality. This article examines the various visual techniques for spatial simulation available today and their implementation by students involved with architectural projects.
keywords	Full-scale Modeling, Model Simulation, Real Environments
series	other
type	normal paper
email
more	http://info.tuwien.ac.at/efa
last changed	2004/05/04 15:39

_id	beb1
authors	Michel, Laurent
year	1992
title	A NEW SCANNING SKY SIMULATOR
source	Proceedings of the 4rd European Full-Scale Modelling Conference / Lausanne (Switzerland) 9-12 September 1992, Part B, pp. 43-48
summary	A sky simulator has been developed to study daylighting systems on scale models (diffuse component of daylight). This apparatus is of a completely new concept (scanning sky simulator) and has numerous advantages in comparison with similar devices. It allows in particular the reproduction of any sky condition and distinguishes itself by easy calibration, reduced maintenance and moderate electric consumption. The simulator is equipped with a measuring and visualisation system which allows the user to simultaneously carry out quantitative studies (profile of daylight factors) and qualitative studies (visual lighting effects). In this paper, a description of the system and its functioning as well as an application example are given.
keywords	Full-scale Modeling, Model Simulation, Real Environments
series	other
type	normal paper
more	http://info.tuwien.ac.at/efa
last changed	2004/05/04 15:40

_id	8cf3
authors	Müller, Volker
year	1992
title	Reint-Ops: A Tool Supporting Conceptual Design
doi	https://doi.org/10.52842/conf.acadia.1992.221
source	Mission - Method - Madness [ACADIA Conference Proceedings / ISBN 1-880250-01-2] 1992, pp. 221-232
summary	Reasoning is influenced by our perception of the environment. New aspects of our environment help to provoke new thoughts. Thus, changes of what is perceived can be assumed to stimulate the generation of new ideas, as well. In CAD, computerized three-dimensional models of physical entities are produced. Their representation on the monitor is determined by our viewing position and by the rendering method used. Especially the wire-frame representations of views lend themselves to a variety of readings, due to coincident and intersecting lines. Methods by which wire-frame views can be processed to extract the shapes that they contain have been investigated and developed. The extracted shapes can be used as a base for the generation of derived entities through various operations that are called Reinterpretation Operations. They have been implemented as a prototypical extension (named Reint-Ops) to an existing modeling shell. ReintOps is a highly interactive exploratory CAD tool, which allows the user to customize criteria and factors which are used in the reinterpretation process. This tool can be regarded as having a potential to support conceptual design investigations.
keywords	CAD, Three-dimensional Model, Wireframe Representation, Shape Extraction, Generation of Derived Entities, Reinterpretation, Conceptual Design
series	ACADIA
email
last changed	2022/06/07 07:59

_id	4075
authors	Rahman, O. M. A.
year	1992
title	Visual quality and response assessment: an experimental technique
source	Environment and Planning B: Planning and Design 19, pp. 689-708
summary	Contributed by Susan Pietsch (spietsch@arch.adelaide.edu.au)
keywords	3D City Modeling, Development Control, Design Control
series	other
last changed	2001/06/04 20:41

_id	avocaad_2001_19
id	avocaad_2001_19
authors	Shen-Kai Tang, Yu-Tung Liu, Yu-Sheng Chung, Chi-Seng Chung
year	2001
title	The visual harmony between new and old materials in the restoration of historical architecture: A study of computer simulation
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 research of historical architecture restoration, scholars respectively focus on the field of architectural context and architectural archeology (Shi, 1988, 1990, 1991, 1992, 1995; Fu, 1995, 1997; Chiu, 2000) or on architecture construction and the procedure of restoration (Shi, 1988, 1989; Chiu, 1990). How to choose materials and cope with their durability becomes an important issue in the restoration of historical architecture (Dasser, 1990; Wang, 1998).In the related research of the usage and durability of materials, some scholars deem that, instead of continuing the traditional ways that last for hundreds of years (that is to replace new materials with old ones), it might be better to keep the original materials (Dasser, 1990). However, unavoidably, some of the originals are much worn. Thus we have to first establish the standard of eliminating components, and secondly to replace identical or similar materials with the old components (Lee, 1990). After accomplishing the restoration, we often unexpectedly find out that the renewed historical building is too new that the sense of history is eliminated (Dasser, 1990; Fu, 1997). Actually this is the important factor that determines the accomplishment of restoration. In the past, some scholars find out that the contrast and conflict between new and old materials are contributed to the different time of manufacture and different coating, such as antiseptic, pattern, etc., which result in the discrepancy of the sense of visual perception (Lee, 1990; Fu, 1997; Dasser, 1990).In recent years, a number of researches and practice of computer technology have been done in the field of architectural design. We are able to proceed design communication more exactly by the application of some systematic softwares, such as image processing, computer graphic, computer modeling/rendering, animation, multimedia, virtual reality and so on (Lawson, 1995; Liu, 1996). The application of computer technology to the research of the preservation of historical architecture is comparatively late. Continually some researchers explore the procedure of restoration by computer simulation technology (Potier, 2000), or establish digital database of the investigation of historical architecture (Sasada, 2000; Wang, 1998). How to choose materials by the technology of computer simulation influences the sense of visual perception. Liu (2000) has a more complete result on visual impact analysis and assessment (VIAA) about the research of urban design projection. The main subjects of this research paper focuses on whether the technology of computer simulation can extenuate the conflict between new and old materials that imposed on visual perception.The objective of this paper is to propose a standard method of visual harmony effects for materials in historical architecture (taking the Gigi Train Station destroyed by the earthquake in last September as the operating example).There are five steps in this research: 1.Categorize the materials of historical architecture and establish the information in digital database. 2.Get new materials of historical architecture and establish the information in digital database. 3.According to the mixing amount of new and old materials, determinate their proportion of the building; mixing new and old materials in a certain way. 4.Assign the mixed materials to the computer model and proceed the simulation of lighting. 5.Make experts and the citizens to evaluate the accomplished computer model in order to propose the expected standard method.According to the experiment mentioned above, we first address a procedure of material simulation of the historical architecture restoration and then offer some suggestions of how to mix new and old materials.By this procedure of simulation, we offer a better view to control the restoration of historical architecture. And, the discrepancy and discordance by new and old materials can be released. Moreover, we thus avoid to reconstructing ¡§too new¡¨ historical architecture.
series	AVOCAAD
email
last changed	2005/09/09 10:48

_id	a5fc
authors	Shinners, Neil, D’Cruz, Neville and Marriott, Andrew
year	1992
title	Multi-Faceted Architectural Visualization
doi	https://doi.org/10.52842/conf.acadia.1992.141
source	Mission - Method - Madness [ACADIA Conference Proceedings / ISBN 1-880250-01-2] 1992, pp. 141-153
summary	As well as learning traditional design techniques, students in architecture courses learn how to use powerful workstations with CAD systems, color scanners and laser printers and software for the rendering, compositing and animating of their designs. They learn to use raytracing and radiosity rendering systems to provide visual realism, alpha-channel compositing systems to put a client in the picture (literally) or the design in situ, and keyframe animation systems to allow realistic walkthroughs. Student Presentations are now based on videos, photographic slides, slide shows or real time animation. Images (as data files) are imported into full color publishing systems for final year thesis presentation. The architectural graphics environment at Curtin University facilitates the integration of slide and video examples of raytraced and chroma-keyed images with computer aided design techniques for architectural student presentations.
series	ACADIA
email
last changed	2022/06/07 07:56

_id	avocaad_2001_17
id	avocaad_2001_17
authors	Ying-Hsiu Huang, Yu-Tung Liu, Cheng-Yuan Lin, Yi-Ting Cheng, Yu-Chen Chiu
year	2001
title	The comparison of animation, virtual reality, and scenario scripting in design process
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	Design media is a fundamental tool, which can incubate concrete ideas from ambiguous concepts. Evolved from freehand sketches, physical models to computerized drafting, modeling (Dave, 2000), animations (Woo, et al., 1999), and virtual reality (Chiu, 1999; Klercker, 1999; Emdanat, 1999), different media are used to communicate to designers or users with different conceptual levels¡@during the design process. Extensively employed in design process, physical models help designers in managing forms and spaces more precisely and more freely (Millon, 1994; Liu, 1996).Computerized drafting, models, animations, and VR have gradually replaced conventional media, freehand sketches and physical models. Diversely used in the design process, computerized media allow designers to handle more divergent levels of space than conventional media do. The rapid emergence of computers in design process has ushered in efforts to the visual impact of this media, particularly (Rahman, 1992). He also emphasized the use of computerized media: modeling and animations. Moreover, based on Rahman's study, Bai and Liu (1998) applied a new design media¡Xvirtual reality, to the design process. In doing so, they proposed an evaluation process to examine the visual impact of this new media in the design process. That same investigation pointed towards the facilitative role of the computerized media in enhancing topical comprehension, concept realization, and development of ideas.Computer technology fosters the growth of emerging media. A new computerized media, scenario scripting (Sasada, 2000; Jozen, 2000), markedly enhances computer animations and, in doing so, positively impacts design processes. For the three latest media, i.e., computerized animation, virtual reality, and scenario scripting, the following question arises: What role does visual impact play in different design phases of these media. Moreover, what is the origin of such an impact? Furthermore, what are the similarities and variances of computing techniques, principles of interaction, and practical applications among these computerized media?This study investigates the similarities and variances among computing techniques, interacting principles, and their applications in the above three media. Different computerized media in the design process are also adopted to explore related phenomenon by using these three media in two projects. First, a renewal planning project of the old district of Hsinchu City is inspected, in which animations and scenario scripting are used. Second, the renewal project is compared with a progressive design project for the Hsinchu Digital Museum, as designed by Peter Eisenman. Finally, similarity and variance among these computerized media are discussed.This study also examines the visual impact of these three computerized media in the design process. In computerized animation, although other designers can realize the spatial concept in design, users cannot fully comprehend the concept. On the other hand, other media such as virtual reality and scenario scripting enable users to more directly comprehend what the designer's presentation.Future studies should more closely examine how these three media impact the design process. This study not only provides further insight into the fundamental characteristics of the three computerized media discussed herein, but also enables designers to adopt different media in the design stages. Both designers and users can more fully understand design-related concepts.
series	AVOCAAD
email
last changed	2005/09/09 10:48

_id	aab6
authors	Bermudez, Julio
year	1995
title	Designing Architectural Experiences: Using Computers to Construct Temporal 3D Narratives
doi	https://doi.org/10.52842/conf.acadia.1995.139
source	Computing in Design - Enabling, Capturing and Sharing Ideas [ACADIA Conference Proceedings / ISBN 1-880250-04-7] University of Washington (Seattle, Washington / USA) October 19-22, 1995, pp. 139-149
summary	Computers are launching us into a representational revolution that fundamentally challenges the way we have hitherto conceived and practiced architecture. This paper will explore one of its fronts: the simulation of architectural experiences. Today's off-the-shelf softwares (e.g. 3D modeling, animations, multimedia) allow us for first time in history to depict and thus approach architectural design and criticism truly experientially. What is so appealing about this is the possibility of shifting our attention from the object to the experience of the object and in so doing reconceptualizing architectural design as the design of architectural experiences. Carrying forward such a phenomenological proposition requires us to know (1) how to work with non-traditional and 'quasi-immersive' (or subject-centered) representational systems, and (2) how to construct temporal assemblages of experiential events that unfold not unlike 'architectural stories'. As our discipline lacks enough knowledge on this area, importing models from other fields appears as an appropriate starting point. In this sense, the narrative arts (especially those involved with the temporal representation of audio-visual narratives) offer us the best insights. For example, principles of cinema and storytelling give us an excellent guidance for designing architectural experiences that have a structuring theme (parti), a plot (order), unfolding episodes (rhythm), and special events (details). Approaching architecture as a temporal 3D narrative does transform the design process and, consequently, its results. For instance, (1) phenomenological issues enter the decision making process in an equal footing to functional, technological, or compositional considerations; (2) orthographic representations become secondary sources of information, mostly used for later accurate dimensioning or geometrization; (3) multi-sensory qualities beyond sight are seriously considered (particularly sound, texture, and kinesthetic); etc.
series	ACADIA
email
last changed	2022/06/07 07:52

_id	413e
authors	Dalholm-Hornyansky, Elisabeth and Rydberg-Mitchell, Birgitta
year	1996
title	SPATIAL NAVIGATION IN VIRTUAL REALITY
source	Full-Scale Modeling in the Age of Virtual Reality [6th EFA-Conference Proceedings]
summary	For the past decade, we have carried out a number of participation projects using full-scale modeling as an aid for communication and design. We are currently participating in an interdisciplinary research project which aims to combine and compare various visualization methods and techniques, among others, full-scale modeling and virtual reality, in design processes with users. In this paper, we will discuss virtual reality as a design tool in light of previous experience with full-scale modeling and literature on cognitive psychology. We describe a minor explorative study, which was carried out to elucidate the answers to several crucial questions: Is realism in movement a condition for the perception of space or can it be achieved while moving through walls, floors and so forth? Does velocity of movement and reduced visual field have an impact on the perception of space? Are landmarks vital clues for spatial navigation and how do we reproduce them in virtual environments? Can “daylight“, color, material and texture facilitate navigation and are details, furnishings and people important objects of reference? How could contextual information clues, like views and surroundings, be added to facilitate orientation? Do we need our other senses to supplement the visual experience in virtual reality and what is the role of mental maps in spatial navigation?
keywords	Model Simulation, Real Environments
series	other
type	normal paper
email
more	http://info.tuwien.ac.at/efa/
last changed	2004/05/04 14:49

_id	acadia23_v1_22
id	acadia23_v1_22
authors	Huang, Alvin
year	2023
title	Enhancing Therapeutic Experiences: The Role of Geometry, Color, and Texture
source	ACADIA 2023: Habits of the Anthropocene: Scarcity and Abundance in a Post-Material Economy [Volume 1: Projects Catalog of the 43rd Annual Conference of the Association of Computer Aided Design in Architecture (ACADIA) ISBN 979-8-9860805-8-1]. Denver. 26-28 October 2023. edited by A. Crawford, N. Diniz, R. Beckett, J. Vanucchi, M. Swackhamer 22-33.
summary	This project explores the implementation of parametric patterning, digital fabrication, and complex geometries in the creation of a private pediatric neurology clinic. The clinic challenges the conventional utilitarian approach of medical spaces by incorporating color, texture, and geometry to establish a light-filled and lively environment for both patients and staff. Through a careful organization of programmatic spaces, the design optimizes circulation paths, ensuring seamless movement for medical practitioners while providing comfortable waiting areas for patients. The integration of custom-designed elements, such as CNC-milled acoustic felt cladding and a feature wall derived from a CT scan of the human brain, serves to enhance the visual and tactile experiences of children with neurological disorders.
series	ACADIA
type	project
email
last changed	2024/04/17 13:58

_id	ecaade2011_116
id	ecaade2011_116
authors	Koziko_lu, Nilüfer; Kavlak, Emrah
year	2011
title	Introducing Architectural Design Foundations Through Algorithmic Design And Experimentations With Materials: A methodology for freshman class in architecture
doi	https://doi.org/10.52842/conf.ecaade.2011.070
source	RESPECTING FRAGILE PLACES [29th eCAADe Conference Proceedings / ISBN 978-9-4912070-1-3], University of Ljubljana, Faculty of Architecture (Slovenia) 21-24 September 2011, pp.70-76
summary	This paper presents a lecture methodology using pattern based and algorithmic design principles for an introductory architectural design course aimed towards students who are not oriented in design practices but in natural sciences. This methodology is built upon eights interconnected steps, starting with analytical pattern extraction from nature - from the unique texture and structure of a plant (seed or fruit) and also from its lifecycle and relation to the existing habitat. The steps include abstract pattern making with the use of software tools and material building of abstracted geometries as standalone structures. Throughout these steps, principles of information design field is demonstrated to improve students’ abilities to analyze visual information.
wos	WOS:000335665500007
keywords	Pattern; Parametric Design; Design Education; Information Design
series	eCAADe
email
last changed	2022/05/01 23:21

_id	7655
authors	Okeil, Ahmad and El Araby, Mostafa
year	2003
title	Realism vs. Reality in Digital Reconstruction of Cities
source	CORP 2003, Vienna University of Technology, 25.2.-28.2.2003 [Proceedings on CD-Rom]
summary	The digital reconstruction of existing cities using virtual reality techniques is being increasingly used. For consultants, municipalities and planning departments these models provide decision support through visual simulations (El Araby, 2001). For academia they provide a new tool for teaching students urban design and planning (Okeil, 2001). For authorities they provide a tool for promoting the city on the world wide web trying to attract more businesses and tourists to it. The built environment is very rich in detail. It does not only consist of open spaces surrounded by abstract buildings but it also includes many smaller objects such as street furniture, traffic signs, street lights, different types of vegetation and shop signs for example. All surfaces in the built environment have unique properties describing color, texture and opacity. The built environmentis dynamic and our perception is affected by factors such as pedestrian movement, traffic, environmental factors such as wind, noise and shadows. The built environment is also shaped by the accumulation of changes caused by many influences through time. All these factors make the reconstruction of the built environment a very complex task. This paper tries to answer the question: how realistic the reconstructed models of urban areas can be. It sees “Realism“ as a variable floating between three types of realties. The reality of the physical environment which we are trying to represent. The reality of the digital environment which will host the digitally reconstructed city. And the reality of the working environment which deals with the problem of limitation of resources needed to digitally reconstruct the city. A case study of building a 3D computer model of an urban area in the United Arab Emirates demonstrates that new time-saving techniques for data acquisition can enhance realism by meetingbudget limitations and time limitations.
keywords	Virtual Reality; Photo Realism; Texture Maps; 3D Modeling; Urban Design
series	other
email
last changed	2003/03/11 20:39

_id	d935
authors	Pasko, A.A., Adzhiev, V.D., Sourin, A.I. and Savchenko, V.V.
year	1995
title	Function representation in geometric modeling: concepts, implementation and applications
source	The Visual Computer, 11 (8) 429-446
summary	Geometric modeling using continuous real functions of several variables is discussed. Modeling concepts include sets of objects, operations and relations. An object is a closed point set of n-dimensional Euclidean space with a defining inequality f x x xn ( , ,..., ) 1 2 0 °Ÿ . Transformations of a defining function are described for the set-theoretic operations, blending, offsetting, bijective mapping, projection, Cartesian product and metamorphosis. Inclusion, point membership and intersection relations are described. In the implemented interactive modeling system, we use highlevel geometric language that provides extendibility of the modeling system by input symbolic descriptions of primitives, operations and predicates. This approach supports combinations of representational styles, including constructive geometry, sweeping, soft objects, voxel-based objects, deformable and other animated objects. Application examples of aesthetic design, collisions simulation, NC machining, range data processing, and 3D texture generation are given.
series	journal paper
last changed	2003/04/23 15:50

_id	f851
authors	Ramasubramanian, Pattanaik and Greenberg
year	1999
title	A perceptually based physical error metric for realistic image synthesis
source	Alyn Rockwood, editor, SIGGRAPH 99 Conference Proceedings, Annual Conference Series, ACM SIGGRAPH, Addison Wesley
summary	We introduce a new concept for accelerating realistic image synthesis algorithms. At the core of this procedure is a novel physical error metric that correctly predicts the perceptual threshold for detecting artifacts in scene features. Built into this metric is a computational model of the human visual system's loss of sensitivity at high background illumination levels, high spatial frequencies, and high contrast levels (visual masking). An important feature of our model is that it handles the luminance-dependent processing and spatiallydependent processing independently. This allows us to precompute the expensive spatially-dependent component, making our model extremely efficient. We illustrate the utility of our procedure with global illumination algorithms used for realistic image synthesis. The expense of global illumination computations is many orders of magnitude higher than the expense of direct illumination computations and can greatly benefit by applying our perceptually based technique. Results show our method preserves visual quality while achieving significant computational gains in areas of images with high frequency texture patterns, geometric details, and lighting variations.
series	other
last changed	2003/04/23 15:50

_id	sigradi2011_186
id	sigradi2011_186
authors	Valdes Castillo, Francisco Javier
year	2011
title	(STMS) Standard Texture Metrology Simulation for General CNC Machining Processes
source	SIGraDi 2011 [Proceedings of the 15th Iberoamerican Congress of Digital Graphics] Argentina - Santa Fe 16-18 November 2011, pp. 90-93
summary	This research will develop a simplified surfaces roughness measurement system STMSto be used in subtractive CAM processes.This STMS system will involve a solid modeling approach to measure tolerances through CAD comparison procedures, plus the addition of real texture profiles for metrology purposes. The CAD comparison will be performed between the input CAD model (part to be machined) and the output machined model after simulation. The addition of real textures will report levels of surfaces' roughnessbased on standards. To do so, the STMS system will access standard texture databases from an organism of standardization (ex. ISO or ASME). The parameters taken form those databases will be translated in texture profiles and applied as general texture patterns to the output model. After those procedures, the outcomes of the system will be a report about tolerances and roughness of the machined model?s surface, and a realistic textured model useful for virtual mockups, visual inspections as well as design intent checking.
keywords	Machining simulation; Metrology; Virtual Mock-up; Rendering; CAD/CAM
series	SIGRADI
email
last changed	2016/03/10 10:02

_id	8d5c
authors	Wall, S. and Harwin, W.
year	2001
title	Interaction of Visual and Haptic Information in Simulated Environments: Texture Perception
source	Brewster, S., Smith, R. (eds.) Haptic humancomputer interaction : First International Workshop, Glasgow, UK, August31 - September 1, 2000 : Proceedings. Hong Kong: Springer
summary	This paper describes experiments relating to the perception of the roughness of simulated surfaces via the haptic and visual senses. Subjects used a magnitude estimation technique to judge the roughness of "virtual gratings" presented via a PHANToM haptic interface device, and a standard visual display unit. It was shown that under haptic perception, subjects tended to perceive roughness as decreasing with increased grating period, though this relationship was not always statistically significant. Under visual exploration, the exact relationship between spatial period and perceived roughness was less well defined, though linear regressions provided a reliable approximation to individual subjects' estimates.
series	other
last changed	2003/04/23 15:50

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