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	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	ijac202322104
id	ijac202322104
authors	Patino, Ever; Jorge Maya amd Andrés Obregón
year	2024
title	A creative form-finding tool: Deformation of plastic sheets due to the influence of temperature and gravity
source	International Journal of Architectural Computing 2024, Vol. 22 - no. 1, 1-27
summary	A form-finding technique based on the deformation of plastic sheets by the action of gravity and temperature increase is proposed, allowing the exploration of complex geometries to support form-giving processes within architecture projects, both by students and practitioners. Using an analog and computational approach, the ideal material for the technique was selected from a multifactorial experiment. Semi-structured analog experimentation was carried out based on inputs, rules, and outputs previously identified, and the resulting models were morphologically analyzed, to later translate the components of the analog experimentation into a computational algorithm to carry out computational experimentation. The technique can be used as a generator of novel forms possessing adequate transformational qualities. Finally, potential applications of the technique and avenues for future research are presented
keywords	Form-finding, computational design, creative tools, experimentation, plastic sheets, form-giving, representation
series	journal
last changed	2024/07/18 13:03

_id	caadria2020_384
id	caadria2020_384
authors	Patt, Trevor Ryan
year	2020
title	Spectral Clustering for Urban Networks
doi	https://doi.org/10.52842/conf.caadria.2020.2.091
source	D. Holzer, W. Nakapan, A. Globa, I. Koh (eds.), RE: Anthropocene, Design in the Age of Humans - Proceedings of the 25th CAADRIA Conference - Volume 2, Chulalongkorn University, Bangkok, Thailand, 5-6 August 2020, pp. 91-100
summary	As planetary urbanization accelerates, the significance of developing better methods for analyzing and making sense of complex urban networks also increases. The complexity and heterogeneity of contemporary urban space poses a challenge to conventional descriptive tools. In recent years, the emergence of urban network analysis and the widespread availability of GIS data has brought network analysis methods into the discussion of urban form. This paper describes a method for computationally identifying clusters within urban and other spatial networks using spectral analysis techniques. While spectral clustering has been employed in some limited urban studies, on large spatialized datasets (particularly in identifying land use from orthoimages), it has not yet been thoroughly studied in relation to the space of the urban network itself. We present the construction of a weighted graph Laplacian matrix representation of the network and the processing of the network by eigen decomposition and subsequent clustering of eigenvalues in 4d-space.In this implementation, the algorithm computes a cross-comparison for different numbers of clusters and recommends the best option based on either the 'elbow method,' or by "eigen gap" criteria. The results of the clustering operation are immediately visualized on the original map and can also be validated numerically according to a selection of cluster metrics. Cohesion and separation values are calculated simultaneously for all nodes. After presenting these, the paper also expands on the 'silhouette' value, which is a composite measure that seems especially suited to urban network clustering.This research is undertaken with the aim of informing the design process and so the visualization of results within the active 3d model is essential. Within the paper, we illustrate the process as applied to formal grids and also historic, vernacular urban fabric; first on small, extract urban fragments and then over an entire city networks to indicate the scalability.
keywords	Urban morphology; network analysis; spectral clustering; computation
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	ecaade2007_033
id	ecaade2007_033
authors	Paul, Norbert
year	2007
title	A Complex-Based Building Information System
doi	https://doi.org/10.52842/conf.ecaade.2007.591
source	Predicting the Future [25th eCAADe Conference Proceedings / ISBN 978-0-9541183-6-5] Frankfurt am Main (Germany) 26-29 September 2007, pp. 591-598
summary	Volume modeling, finite element computation and spatial information systems have a common basis in topology, especially in the theory of complexes which are higher dimensional generalization of graphs. A complex is a topological space having a certain algebraic structure called “chain complex” and due to its similarity to real world buildings a special kind of complexes are even called “buildings” in mathematics. So it would be consequent to base a building information system upon this theory or at least try to do so. Some manipulations and queries of such spaces can then be expressed by mappings which are similar to complex-morphisms and generalize the well known Euler operators. Other practical useful operations like assigning a detail to a spatial element (“refinement”), hiding details at lower scale views (“coarsening”) or spatial versioning, however, need a somewhat different kind of mappings. This paper shows a simple relational database representation of a finite complex as a basis for a database backed building information system. The implementation of operations on such a relational complex in Java will also be shown.
keywords	Building information modeling, spatial modeling
series	eCAADe
email
last changed	2022/06/07 07:59

_id	sigradi2004_390
id	sigradi2004_390
authors	Paulo Belo Reyes
year	2004
title	A noção de representação nos processos digitais [The Notion of Representation in Digital Processes]
source	SIGraDi 2004 - [Proceedings of the 8th Iberoamerican Congress of Digital Graphics] Porte Alegre - Brasil 10-12 november 2004
summary	This text presents the discussion about digital media in relation to the notion of reality or truth. The representations made by digital graphic media began in a process of representing reality, evolving to a process of construction of a new reality, closer to imagination.
keywords	Digital graphic media, representation, construction of reality
series	SIGRADI
email
last changed	2016/03/10 09:57

_id	sigradi2020_484
id	sigradi2020_484
authors	Pavan, Luís Henrique; Oliveira, Lucas Fernandes de; Rosa, Gabriel Machado da; Kos, José Ripper
year	2020
title	The Privacy of the Academic Community in Mapping Usage Patterns over Wi-Fi Connections
source	SIGraDi 2020 [Proceedings of the 24th Conference of the Iberoamerican Society of Digital Graphics - ISSN: 2318-6968] Online Conference 18 - 20 November 2020, pp. 484-489
summary	Data sourced by mobile devices has gained importance in urban research techniques. We have conducted two different studies on the usage pattern of a university campus using Wi-Fi connections. We have evaluated this data using anonymization methods more restricted than the Brazilian Data Protection Law. One of our studies is an ongoing work on the campus reopening after the coronavirus crisis. We sought to obtain data that may constitute resources to resilient urban projects on campus. Our results highlight the liability of the more restricted anonymization method and the quality maintenance of the data representation simultaneously.
keywords	Wi-Fi connections, Data protection, Data visualization, University campus, Social infrastructure
series	SIGraDi
email
last changed	2021/07/16 11:49

_id	acadia23_v2_44
id	acadia23_v2_44
authors	Pei, Wanyu; Stouffs, Rudi
year	2023
title	Parametric Archetype: A Synthetic Digital Method of Buildings Material Stock Representation Based on Distance Measurement
source	ACADIA 2023: Habits of the Anthropocene: Scarcity and Abundance in a Post-Material Economy [Volume 2: Proceedings of the 43rd Annual Conference for the Association for Computer Aided Design in Architecture (ACADIA) ISBN 979-8-9891764-0-3]. Denver. 26-28 October 2023. edited by A. Crawford, N. Diniz, R. Beckett, J. Vanucchi, M. Swackhamer 44-52.
summary	Building material stock (BMS) is a crucial inventory of secondary resources which contain comprehensive information for analyzing the potential of material reuse and urban harvesting. Due to the complexity of urban building systems and the large number of buildings, obtaining building information one by one is impractical. Existing methods for stock representation mainly start from data collection, and utilize techniques such as clustering, machine learning, computer vision, et cetera, to process and analyze large and complete datasets. However, it is noticed that data on urban buildings, especially for building materials, is very limited or rather inaccessible. Existing methods cannot be applied in data-scarce cities and are also challenging to update over time. Therefore, this study proposes a synthetic approach named parametric archetype for the digital repre- sentation of BMS. This approach combines distance measurement, which is a distance within dimensions describing building features, to match instance buildings dynamically to a parametric archetype with the highest similarity. The weight and types of different building features, which may influence building material (composition and properties) in distance measurement, can be determined by supervised, semi-supervised, or unsuper- vised learning, whether relying on ample available data or domain rules/expert knowledge when data is scarce. This way, the parametric archetype model can use data more effi- ciently to form a synthetic and extensible representation for urban-level BMS (Figure 1). The parametric archetype is anticipated to offer an approach for describing, quantifying, and modeling the real building material stock system incrementally and transparently.
series	ACADIA
type	paper
email
last changed	2024/12/20 09:12

_id	caadria2008_37_session4a_300
id	caadria2008_37_session4a_300
authors	Pellitteri, Giuseppe; Salvatore Concialdi, Raimondo Lattuca
year	2008
title	Performative Architecture: New Semantic for New Shapes?
doi	https://doi.org/10.52842/conf.caadria.2008.300
source	CAADRIA 2008 [Proceedings of the 13th International Conference on Computer Aided Architectural Design Research in Asia] Chiang Mai (Thailand) 9-12 April 2008, pp. 300-208
summary	Two innovations have more deeply changed the building process: the operational continuity of the design and construction phases and the software allowing not only the representation but also the autonomous creation of complex shapes never before thought, just because they could not be represented. This last innovation introduce to a “Performative Architecture” that addresses to emerge a new kind of architecture. Building performances (structural, environmental, energetic) are guiding design principles, adopting new building performance-based priorities for the design of cities, buildings and landscape. This emerging architecture places broadly defined performance above form making; It utilises digital technologies of quantitative and qualitative performance-based simulation to offer a comprehensive approach to the design of the build environment. Some aspects of “Performative Architecture” theories are critically examined and we report two experiments made using these procedures. The results try to give a contribution to detect some misunderstandings in relation to recent building projects shown.
keywords	Performative Architecture, simulation, performance
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	caadria2010_037
id	caadria2010_037
authors	Pelosi, Antony W.
year	2010
title	Obstacles of utilising real-time 3D visualisation in architectural representations and documentation
doi	https://doi.org/10.52842/conf.caadria.2010.391
source	Proceedings of the 15th International Conference on Computer Aided Architectural Design Research in Asia / Hong Kong 7-10 April 2010, pp. 391-400
summary	This paper describes obstacles in using current generation software for real-time 3D visualisations in architectural representations. The obstacles discussed are focused on three areas, controllability of first person view navigation, spatial quality of real-time environment and geometry interoperability. With the increased influence of leading 3D computer games, how can AEC industries leverage the potentials they offer, advanced user interaction and realistic spatial environments. The paper compares CAD and BIM software with current generation 3D computer Game engines.
keywords	Real-time; visualisation; game engine; architectural representation
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	812d
authors	Peng, Q. S.
year	1984
title	An Algorithm for Finding the Intersection Lines Between Two B-Spline Surfaces
source	Computer Aided Design July, 1984. vol. 16: pp. 191-196 : ill. includes bibliography.
summary	A divide-and-conquer algorithm is presented for finding all the intersection lines between two B-spline surfaces. Each surface is organized as an n-branch tree. For each intersection line, an initial point is detected after a depth-first search along one tree, i.e. the host tree. Extrapolation methods are then used to trace the entire length of the line, thus the line appears naturally in a continuous form. Efficiency of the algorithm is achieved by employing of an adaptive division strategy and by the careful choice of the representation basis of the patches on both surfaces
keywords	logic, algorithms, B-splines, techniques, divide-and- conquer, intersection, curves, curved surfaces, representation
series	CADline
last changed	2003/06/02 10:24

_id	acadia17_474
id	acadia17_474
authors	Peng, Wenzhe; Zhang, Fan; Nagakura, Takehiko
year	2017
title	Machines’ Perception of Space: Employing 3D Isovist Methods and a Convolutional Neural Network in Architectural Space Classification
doi	https://doi.org/10.52842/conf.acadia.2017.474
source	ACADIA 2017: DISCIPLINES & DISRUPTION [Proceedings of the 37th Annual Conference of the Association for Computer Aided Design in Architecture (ACADIA) ISBN 978-0-692-96506-1] Cambridge, MA 2-4 November, 2017), pp. 474- 481
summary	Simple and common architectural elements can be combined to create complex spaces. Different spatial compositions of elements define different spatial boundaries, and each produces a unique local spatial experience to observers inside the space. Therefore an architectural style brings about a distinct spatial experience. While multiple representation methods are practiced in the field of architecture, there lacks a compelling way to capture and identify spatial experiences. Describing an observer’s spatial experiences quantitatively and efficiently is a challenge. In this paper, we propose a method that employs 3D isovist methods and a convolutional neural network (CNN) to achieve recognition of local spatial compositions. The case studies conducted validate that this methodology works well in capturing and identifying local spatial conditions, illustrates the pattern and frequency of their appearance in designs, and indicates peculiar spatial experiences embedded in an architectural style. The case study used small designs by Mies van der Rohe and Aldo van Eyck. The contribution of this paper is threefold. First, it introduces a sampling method based on 3D Isovist that generates a 2D image that can be used to represent a 3D space from a specific observation point. Second, it employs a CNN model to extract features from the sampled images, then classifies their corresponding space. Third, it demonstrates a few case studies where this space classification method is applied to different architectural styles.
keywords	design methods; information processing; AI; machine learning; computer vision; representation
series	ACADIA
email
last changed	2022/06/07 08:00

_id	1eeb
authors	Pereira, Gilberto Corso
year	2002
title	Interactive Urban Representation
doi	https://doi.org/10.52842/conf.ecaade.2002.276
source	Connecting the Real and the Virtual - design e-ducation [20th eCAADe Conference Proceedings / ISBN 0-9541183-0-8] Warsaw (Poland) 18-20 September 2002, pp. 276-281
summary	The project discussed here wants to investigate the use of multimedia as a tool to present and to analyze geographical information by making a interactive software for visualization and understanding of urban space of Salvador using thematic cartography, animations, remote sense images, photography and texts, allowing software user to build his personal cartographic visualization.
series	eCAADe
email
last changed	2022/06/07 08:00

_id	sigradi2014_197
id	sigradi2014_197
authors	Pereira, Gilberto Corso
year	2014
title	Representações da Cidade Contemporânea [Representations of the Contemporary City]
source	SiGraDi 2014 [Proceedings of the 18th Conference of the Iberoamerican Society of Digital Graphics - ISBN: 978-9974-99-655-7] Uruguay - Montevideo 12 - 14 November 2014, pp. 516-519
summary	Representation is a key concept for understanding the social uses of technologies associated with manipulation, presentation, storage and maintenance of geographic information.This paper refers to forms of space representation, essentially derived from cartographic techniques, that bases many web applications which aid to promote the development of new forms of social interaction and influence the perception and use of public spaces. The paper discusses the relationship between spatial representation, spatial knowledge and technologies of representation and visualization of space.
series	SIGRADI
email
last changed	2016/03/10 09:57

_id	sigradi2016_770
id	sigradi2016_770
authors	Pereyra Bonifácio, Paulo Adhemar; Echavarría Terradas, Ximena; Flores, Luis; Meirelles, Lucía
year	2016
title	Relacionamiento Entre los Talleres de Arquitectura y el Laboratorio de Fabricación Digital [Relationship Between Academic Architectural Workshops and Digital Fabrication Laboratory]
source	SIGraDi 2016 [Proceedings of the 20th Conference of the Iberoamerican Society of Digital Graphics - ISBN: 978-956-7051-86-1] Argentina, Buenos Aires 9 - 11 November 2016, pp.266-271
summary	This article develops the relationship between academic architectural workshops with digital fabrication laboratory. We understand that it is essential to implement informatics to design, especially the case of digital manufacturing, as an active tool in the design process and project representation.
series	SIGRADI
email
last changed	2021/03/28 19:59

_id	2005_797
id	2005_797
authors	Petzold, Frank and Donath, Dirk
year	2005
title	Tailor-made: Adapting and Extending CA(A)Dsystems
doi	https://doi.org/10.52842/conf.ecaade.2005.797
source	Digital Design: The Quest for New Paradigms [23nd eCAADe Conference Proceedings / ISBN 0-9541183-3-2] Lisbon (Portugal) 21-24 September 2005, pp. 797-803
summary	CA(A)D systems are nowadays a part of everyday architectural practice and have completely replaced drawing with pen and T-square. The standard functions of such systems are (usually) sufficient for the everyday needs of practical work. The question is: can CA(A)D systems be adapted to improve work efficiency for specific users or applications such as those of the architect? Most current CA(A)D systems already provide some level of support for individual adaptation however these are rarely exploited by the end users. This paper discusses the teaching of skills for adapting and extending existing CA(A)D systems in current architectural education. In addition to the teaching of programming and operational skills, the course also examines the critical examination of CA(A)D systems and the formulation of user requirements (analysis), the search for existing solutions, functions or extensions (research) and the technical adaptation or extension of the system (software development). Using examples from current coursework, the paper illustrates both process and results of teaching practice.
keywords	Digital Design Education, 2D Representation, Design Process, 3D Modeling, Education in CAAD
series	eCAADe
email
last changed	2022/06/07 08:00

_id	sigradi2006_p017c
id	sigradi2006_p017c
authors	Piantá Costa Cabral, Cláudia
year	2006
title	Zoom-in, zoom-out: escala arquitetônica e tecnologia digital [Zoom-in, zoom-out: Architectonic scale and digital technology]
source	SIGraDi 2006 - [Proceedings of the 10th Iberoamerican Congress of Digital Graphics] Santiago de Chile - Chile 21-23 November 2006, pp. 447-450
summary	This paper expects to concur for the study of the relationship between technology, knowledge and representation. It is based on previous studies on architecture, art and technology on modernity and its development, as well as studies about scale in architectural design. In despite of the fact that scale can be technically considered indifferent for computer aided design, I wish to discuss how digital tools intercede in the process of clipping that selecting a specific scale eventually implies, sustaining that for architectural design, the concept of scale has to do both with representation and knowledge of reality.
series	SIGRADI
email
last changed	2016/03/10 09:57

_id	6bac
authors	Piegl, L.
year	1984
title	A Generalization of the Bernstein-Bezier Method
source	Computer Aided Design. Butterworth & Co. (publishers) Ltd., July, 1984. vol. 16: pp. 209-215 : ill. includes bibliography
summary	A representation for parametric curves and surfaces is presented which generalizes the scheme of the nonrational Bezier curve and surface by introducing appropriate parameters into the parametric forms. A brief discussion of the continuity conditions and a comparison with the rational Bezier curve and surface are included
keywords	parametrization, curves, curved surfaces, Bezier
series	CADline
last changed	2003/06/02 10:24

_id	2699
authors	Piegl, L.
year	1985
title	Recursive Algorithms for the Representation of Parametric Curves and Surfaces
source	Computer Aided Design Butterworth & Co. (publishers) Ltd., June, 1985. vol. 17: pp. 225-230 : ill.
summary	includes a short bibliography. Recursive algorithms for the representation of parametric curves and surfaces are presented which are based upon a geometric property of the de Casteljau algorithm. The algorithms work with triangular and pyramidal arrays that provide an easy handing of the curve and the surface 'in a large' design
keywords	representation, recursion, algorithms, parametrization, curves, curved surfaces
series	CADline
last changed	2003/06/02 13:58

_id	4f7a
authors	Piegl, L.
year	1985
title	The Sphere as a Rational Bezier Surface
source	[4], 18 p. : ill. October, 1985. Preprint No. 07-13. includes bibliography
summary	A method is developed for the efficient representation of spherical caps by using the rational Bezier scheme of Computer Aided Design. The technique is applied to describe special spherical patches such as the hemi-sphere, an octant of a sphere and the whole sphere. A geometric interpretation of quadratic curves and quadric patches is used in order to obtain an insight into the geometry inherent in the rational Bezier scheme and so to make easier the selection of the spherical patch out of the quadric primitives
keywords	Bezier, curved surfaces, CAD
series	CADline
last changed	2003/06/02 13:58

_id	4577
authors	Piegl, L.
year	1986
title	Representation of Rational Bezier Curves and Surfaces by Recursive Algorithms
source	Computer Aided Design Butterworth & Co. (publishers) Ltd., September, 1986. vol. 18: pp. 361-366 : ill.
summary	includes a short bibliography. Recursive algorithms for the computation and subdivision of rational Bezier curves and surfaces are presented. The development uses the relationship between the R4 geometry and the rational scheme
keywords	curves, curved surfaces, recursion, Bezier, representation
series	CADline
last changed	2003/06/02 13:58

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