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	sigradi2010_209
id	sigradi2010_209
authors	Aroztegui, Carmen
year	2010
title	Superficies adulteradas: el muro en línea y la representación fílmica [Adulterated surfaces: the online wall and conematic representation]
source	SIGraDi 2010_Proceedings of the 14th Congress of the Iberoamerican Society of Digital Graphics, pp. Bogotá, Colombia, November 17-19, 2010, pp. 209-212
summary	Online communities use a “wall” as a place to articulate non - synchronic communication among its members. Such a place, however, poorly explores the metaphor of the wall as a means of enhancing online experiences. Online “walls” do not explore or challenge the richness of a real wall, and they do not embrace new experiences that are only possible in the digital world. In order to tackle these issues, this paper analyzes three movie scenes where the everyday perception of the wall is altered by madness and estrangement. Finally, the paper suggests how these perceptions of the wall could be integrated into interfaces using touch screen technologies.
keywords	online, wall, metaphor, film, representation
series	SIGRADI
email
last changed	2016/03/10 09:47

_id	ecaade2010_215
id	ecaade2010_215
authors	Barczik, Guenter
year	2010
title	Uneasy Coincidence? Massive Urbanization and New Exotic Geometries with Algebraic Geometry as an Extreme Example
doi	https://doi.org/10.52842/conf.ecaade.2010.217
source	FUTURE CITIES [28th eCAADe Conference Proceedings / ISBN 978-0-9541183-9-6] ETH Zurich (Switzerland) 15-18 September 2010, pp.217-226
summary	We investigate the recent coincidence of rapid global urbanization and unprecedented formal freedom in architectural design and ask whether this coincidence is an uneasy one. To study an extreme case of the new exotic geometries made possible through CAAD, we employ algebraic surfaces to experimentally design architecture in an university-based research and experimental design project. Such surfaces exhibit unprecedented complexity and new geometric and topological features yet are highly sound and harmonious. We continue and extend our research presented at the eCAADe 2009 conference in Istanbul.
wos	WOS:000340629400023
keywords	Algebraic geometry; Shape; Sculpture; design; Tool; Experiment; Methodology; Software
series	eCAADe
email
last changed	2022/06/07 07:54

_id	ecaade2012_266
id	ecaade2012_266
authors	Casucci, Tommaso ; Erioli, Alessio
year	2012
title	Behavioural Surfaces: Project for the Architecture Faculty library in Florence
doi	https://doi.org/10.52842/conf.ecaade.2012.1.339
source	Achten, Henri; Pavlicek, Jiri; Hulin, Jaroslav; Matejovska, Dana (eds.), Digital Physicality - Proceedings of the 30th eCAADe Conference - Volume 1 / ISBN 978-9-4912070-2-0, Czech Technical University in Prague, Faculty of Architecture (Czech Republic) 12-14 September 2012, pp. 339-345
summary	Behavioural Surfaces is a thesis project in Architecture discussed on December 2010 at the University of Florence. The project explores the surfacespace relationship in which a surface condition, generated from intensive datascapes derived from environmental data, is able to produce spatial differentiation and modulate structural and environmental preformance. Exploiting material self-organization in sea sponges as surfaces that deploy function and performance through curvature modulation and space defi nition, two different surface definition processes were explored to organize the system hierarchy and its performances at two different scales. At the macroscale, the global shape of the building is shaped on the base of isopotential surfaces while at a more detailed level the multi-performance skin system is defi ned upon the triply periodic minimal surfaces (TPMS).
wos	WOS:000330322400034
keywords	Digital datascape; Isosurfaces; Material intelligence; Minimal sufaces
series	eCAADe
email
last changed	2022/06/07 07:55

_id	acadia10_103
id	acadia10_103
authors	Flöry, Simon; Pottmann, Helmut
year	2010
title	Ruled Surfaces for Rationalization and Design in Architecture
doi	https://doi.org/10.52842/conf.acadia.2010.103
source	ACADIA 10: LIFE in:formation, On Responsive Information and Variations in Architecture [Proceedings of the 30th Annual Conference of the Association for Computer Aided Design in Architecture (ACADIA) ISBN 978-1-4507-3471-4] New York 21-24 October, 2010), pp. 103-109
summary	In this work, we address the challenges in the realization of free-form architecture and complex shapes in general with the technical advantages of ruled surfaces. We propose a geometry processing framework to approximate (rationalize) a given shape by one or multiple strips of ruled surfaces. We discuss techniques to achieve an overall smooth surface and develop a parametric model for the generation of curvature continuous surfaces composed of ruled surface strips. We illustrate the usability of the proposed process at hand of several projects, where the pipeline has been applied to compute NC data for mould production and to rationalize large parts of free-form facades.
keywords	geometry processing; architectural geometry; ruled surface; strip model; surface fitting
series	ACADIA
type	normal paper
email
last changed	2022/06/07 07:51

_id	cf2011_p027
id	cf2011_p027
authors	Herssens, Jasmien; Heylighen Ann
year	2011
title	A Framework of Haptic Design Parameters for Architects: Sensory Paradox Between Content and Representation
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. 685-700.
summary	Architects‚Äîlike other designers‚Äîtend to think, know and work in a visual way. In design research, this way of knowing and working is highly valued as paramount to design expertise (Cross 1982, 2006). In case of architecture, however, it is not only a particular strength, but may as well be regarded as a serious weakness. The absence of non-visual features in traditional architectural spatial representations indicates how these are disregarded as important elements in conceiving space (Dischinger 2006). This bias towards vision, and the suppression of other senses‚Äîin the way architecture is conceived, taught and critiqued‚Äîresults in a disappearance of sensory qualities (Pallasmaa 2005). Nevertheless, if architects design with more attention to non visual senses, they are able to contribute to more inclusive environments. Indeed if an environment offers a range of sensory triggers, people with different sensory capacities are able to navigate and enjoy it. Rather than implementing as many sensory triggers as possible, the intention is to make buildings and spaces accessible and enjoyable for more people, in line with the objective of inclusive design (Clarkson et al. 2007), also called Design for All or Universal Design (Ostroff 2001). Within this overall objective, the aim of our study is to develop haptic design parameters that support architects during design in paying more attention to the role of haptics, i.e. the sense of touch, in the built environment by informing them about the haptic implications of their design decisions. In the context of our study, haptic design parameters are defined as variables that can be decided upon by designers throughout the design process, and the value of which determines the haptic characteristics of the resulting design. These characteristics are based on the expertise of people who are congenitally blind, as they are more attentive to non visual information, and of professional caregivers working with them. The parameters do not intend to be prescriptive, nor to impose a particular method. Instead they seek to facilitate a more inclusive design attitude by informing designers and helping them to think differently. As the insights from the empirical studies with people born blind and caregivers have been reported elsewhere (Authors 2010), this paper starts by outlining the haptic design parameters resulting from them. Following the classification of haptics into active, dynamic and passive touch, the built environment unfolds into surfaces that can act as ‚Äúmovement‚Äù, ‚Äúguiding‚Äù and/or ‚Äúrest‚Äù plane. Furthermore design techniques are suggested to check the haptic qualities during the design process. Subsequently, the paper reports on a focus group interview/workshop with professional architects to assess the usability of the haptic design parameters for design practice. The architects were then asked to try out the parameters in the context of a concrete design project. The reactions suggest that the participating architects immediately picked up the underlying idea of the parameters, and recognized their relevance in relation to the design project at stake, but that their representation confronts us with a sensory paradox: although the parameters question the impact of the visual in architectural design, they are meant to be used by designers, who are used to think, know and work in a visual way.
keywords	blindness, design parameters, haptics, inclusive design, vision
series	CAAD Futures
email
last changed	2012/02/11 19:21

_id	caadria2010_001
id	caadria2010_001
authors	Hsu, Tse-Wie; Shang-Chia Chiou and Jen Yen
year	2010
title	Vine grammar generative system
doi	https://doi.org/10.52842/conf.caadria.2010.009
source	Proceedings of the 15th International Conference on Computer Aided Architectural Design Research in Asia / Hong Kong 7-10 April 2010, pp. 9-18
summary	Graphic designers always take both time and efforts when they are creating a decorative pattern with complicated curves and a great deal of motifs. Although there are many sourcebooks of decorative patterns, the satisfaction of the results couldn’t accomplish with designer’s requirements. Thus, graphic designers need a faster and easier system to create decorative patterns in classical style. There are a few effiencient methods to analysis curves and surfaces in the development of shape grammars. The purpose of this research is to develop Vine Grammar based on shape grammars. The vine grammar analyses principles hidden in the language of deisgn works to create the order, then generates design by using Bézier curves. This research also presents the development of a decorative pattern generative system called Shlishi by using FLASH Action Script 2.0. The grammar can be applied with computers and to verify rules quickly by Shlishi. The intention of this research is to make graphic designers to use these rules to create decorative patterns of plants in classic style and to produce satisfactory results for designer more efficiently or to make the results the source materials for the follow-up design works.
keywords	Vine; Shlishi; decorative patterns; shape grammar; generative design system
series	CAADRIA
email
last changed	2022/06/07 07:50

_id	sigradi2010_240
id	sigradi2010_240
authors	Lombera, Rodríguez Hassán; Trujillo Rivero Andy
year	2010
title	Real - time Minor Deformations that Result from Collisions Using Bump and Normal Mapping
source	SIGraDi 2010_Proceedings of the 14th Congress of the Iberoamerican Society of Digital Graphics, pp. Bogotá, Colombia, November 17-19, 2010, pp. 240-243
summary	This paper presents a method for simulating minor deformations that result from collisions on objects’ surfaces. The method alters only bump maps and leaves mesh geometry unchanged; it is suited to real - time applications where the primary concern is computational efficiency. The paper provides a representative model for deformable objects. Texture mapping and computer graphics techniques based on lighting are referenced as well. Finally, results are provided, along with the most noteworthy findings obtained with the use of this method.
keywords	bump mapping, normal mapping, minor deformations, real - time.
series	SIGRADI
email
last changed	2016/03/10 09:55

_id	ijac20108306
id	ijac20108306
authors	Peters, Brady
year	2010
title	Acoustic Performance as a Design Driver: Sound Simulation and Parametric Modeling using SmartGeometry
source	International Journal of Architectural Computing vol. 8 - no. 3, pp. 337-358
summary	Acoustic performance is an inevitable part of architectural design. Our sonic experience is modified by the geometry and material choices of the designer. Acoustic performance must be understood both on the level of material performance and also at the level of the entire composition. With new parametric and scripting tools performance driven design is possible. Parametric design and scripting tools can be used to explore not only singular objectives, but gradient conditions. Acoustic performance is often thought of in terms of singular performance criteria. This research suggested acoustic design can be understood in terms of gradients and multiple performance parameters. Simulation and modeling techniques for computational acoustic prediction now allow architects to more fully engage with the phenomenon of sound and digital models can be studied to produce data, visualizations, animations, and auralizations of acoustic performance. SmartGeometry has promoted design methods and educational potentials of a performance-driven approach to architectural design through parametric modeling and scripting. The SmartGeometry workshops have provided links between engineering and architecture, analysis and design; they have provided parametric and scripting tools that can provide both a common platform, links between platforms, but importantly an intellectual platform where these ideas can mix. These workshops and conferences have inspired two projects that both used acoustic performance as a design driver. The Smithsonian Institution Courtyard Enclosure and the Manufacturing Parametric Acoustic Surfaces (MPAS) installation at SmartGeometry 2010 are presented as examples of projects that used sound simulation parametric modeling to create acoustically performance driven architecture.
series	journal
last changed	2019/05/24 09:55

_id	ecaade2010_055
id	ecaade2010_055
authors	Peters, Brady; Olesen, Tobias S.
year	2010
title	Integrating Sound Scattering Measurements in the Design of Complex Architectural Surfaces: Informing a parametric design strategy with acoustic measurements from rapid prototype scale models
doi	https://doi.org/10.52842/conf.ecaade.2010.481
source	FUTURE CITIES [28th eCAADe Conference Proceedings / ISBN 978-0-9541183-9-6] ETH Zurich (Switzerland) 15-18 September 2010, pp.481-491
summary	Digital tools present the opportunity for incorporating performance analysis into the architectural design process. Acoustic performance is an important criterion for architectural design. There is much known about sound absorption but little about sound scattering, even though scattering is recognized to be one of the most important factors in predicting the acoustic performance of architectural spaces. This paper proposes a workflow for the design of complex architectural surfaces and the prediction of their sound scattering properties. This workflow includes the development of computational design tools, geometry generation, fabrication of test surfaces, measurement of acoustic performance, the incorporation of this data into the generative tool. The Hexagon Wall is included and discussed as an illustrative design study.
wos	WOS:000340629400052
keywords	Architectural acoustics; Parametric design; Rapid prototyping
series	eCAADe
email
last changed	2022/06/07 08:00

_id	ecaade2010_100
id	ecaade2010_100
authors	Stavric, Milena; Hirschberg, Urs; Wiltsche, Albert
year	2010
title	Spatializing Planar Ornaments: Towards esthetic control in segmenting and building curved surfaces
doi	https://doi.org/10.52842/conf.ecaade.2010.437
source	FUTURE CITIES [28th eCAADe Conference Proceedings / ISBN 978-0-9541183-9-6] ETH Zurich (Switzerland) 15-18 September 2010, pp.437-443
summary	This paper gives insight into an ongoing funded research project dealing with architectural geometry and nonstandard fabrication methods. The innovative aspect of the project lies in the way it uses geometric ornamentation as a method to control the construction of double curved free-form surfaces out of planar building elements. After a short outline of the state of the art the paper gives an overview of the project’s novel constructive and esthetic approach to the planarization of curved forms, discusses the implications of the approach and presents some preliminary results.
wos	WOS:000340629400047
keywords	Architectural geometry; Nonstandard structures; Ornament; Mass customization
series	eCAADe
email
last changed	2022/06/07 07:56

_id	acadia10_196
id	acadia10_196
authors	Tenu, Vlad
year	2010
title	Minimal Surfaces as Self-organizing Systems
doi	https://doi.org/10.52842/conf.acadia.2010.196
source	ACADIA 10: LIFE in:formation, On Responsive Information and Variations in Architecture [Proceedings of the 30th Annual Conference of the Association for Computer Aided Design in Architecture (ACADIA) ISBN 978-1-4507-3471-4] New York 21-24 October, 2010), pp. 196-202
summary	Minimal surfaces have been gradually translated from mathematics to architectural design research due to their fascinating geometric and spatial properties. Tensile structures are just an example of their application in architecture known since the early 1960s. The present research relates to the problem of generating minimal surface geometries computationally using self-organizing particle spring systems and optimizing them for digital fabrication. The algorithm is iterative and it has a different approach than a standard computational method, such as dynamic relaxation, because it does not start with a pre-defined topology and it consists of simultaneous processes that control the geometry’s tessellation. The method is tested on triply periodic minimal surfaces and focused on several fabrication techniques such as a tensegrity modular system composed of interlocked rings (Figure 1).
keywords	Minimal Surfaces
series	ACADIA
type	normal paper
email
last changed	2022/06/07 07:58

_id	ecaade2023_317
id	ecaade2023_317
authors	Zamani, Alireza, Mohseni, Alale and Bertug Çapunaman, Özgüç
year	2023
title	Reconfigurable Formwork System for Vision-Informed Conformal Robotic 3D Printing
doi	https://doi.org/10.52842/conf.ecaade.2023.1.387
source	Dokonal, W, Hirschberg, U and Wurzer, G (eds.), Digital Design Reconsidered - Proceedings of the 41st Conference on Education and Research in Computer Aided Architectural Design in Europe (eCAADe 2023) - Volume 1, Graz, 20-22 September 2023, pp. 387–396
summary	Robotic additive manufacturing has garnered significant research and development interest due to its transformative potential in architecture, engineering, and construction as a cost-effective, material-efficient, and energy-saving fabrication method. However, despite its potential, conventional approaches heavily depend on meticulously optimized work environments, as robotic arms possess limited information regarding their immediate surroundings (Bechthold, 2010; Bechthold & King, 2013). Furthermore, such approaches are often restricted to planar build surfaces and slicing algorithms due to computational and physical practicality, which consequently limits the feasibility of robotic solutions in scenarios involving complex geometries and materials. Building on previous work (Çapunaman et al., 2022), this research investigates conformal 3D printing of clay using a 6 degrees-of-freedom robot arm and a vision-based sensing framework on parametrically reconfigurable tensile hyperbolic paraboloid (hypar) formwork. In this paper, we present the implementation details of the formwork system, share findings from preliminary testing of the proposed workflow, and demonstrate application feasibility through a design exercise that aims to fabricate unique components for a poly-hypar surface structure. The formwork system also offers parametric control over generating complex, non-planar tensile surfaces to be printed on. Within the scope of this workflow, the vision-based sensing framework is employed to generate a digital twin informing iterative tuning of the formwork geometry and conformal toolpath planning on scanned geometries. Additionally, we utilized the augmented fabrication framework to observe and analyze deformations in the printed clay body that occurs during air drying. The proposed workflow, in conjunction with the vision-based sensing framework and the reconfigurable formwork, aims to minimize time and material waste in custom formwork fabrication and printing support materials for complex geometric panels and shell structures.
keywords	Robotic Fabrication, Conformal 3D Printing, Additive Manufacturing, Computer-Vision, Reconfigurable Formwork
series	eCAADe
email
last changed	2023/12/10 10:49

_id	8ae8
authors	Ayala, D., P. Brunet and Juan (et al)
year	1985
title	Object Representation by Means of Nominimal Division Quadtrees and Octrees
source	ACM Transactions on Graphics. January, 1985. vol. 4: pp. 41-59 : ill. includes bibliography
summary	Quadtree representation of two-dimensional objects is performed with a tree that describes the recursive subdivision of the more complex parts of a picture until the desired resolution is reached. At the end, all the leaves of the tree are square cells that lie completely inside or outside the object. There are two great disadvantages in the use of quadtrees as a representation scheme for objects in geometric modeling system: The amount of memory required for polygonal objects is too great, and it is difficult to recompute the boundary representation of the object after some Boolean operations have been performed. In the present paper a new class of quadtrees, in which nodes may contain zero or one edge, is introduced. By using these quadtrees, storage requirements are reduced and it is possible to obtain the exact backward conversion to boundary representation. Algorithms for the generation of the quadtree, boolean operation, and recomputation of the boundary representation are presented, and their complexities in time and space are discussed. Three- dimensional algorithms working on octrees are also presented. Their use in the geometric modeling of three-dimensional polyhedral objects is discussed
keywords	geometric modeling, algorithms, octree, quadtree, curves, curved surfaces, boolean operations
series	CADline
last changed	2003/06/02 13:58

_id	acadia15_381
id	acadia15_381
authors	Jabi, Wassim
year	2015
title	The Potential of Non-Manifold Topology in the Early Design Stages
doi	https://doi.org/10.52842/conf.acadia.2015.381
source	ACADIA 2105: Computational Ecologies: Design in the Anthropocene [Proceedings of the 35th Annual Conference of the Association for Computer Aided Design in Architecture (ACADIA) ISBN 978-0-692-53726-8] Cincinnati 19-25 October, 2015), pp. 381-493
summary	The importance of decisions made during the early design stages has prompted researchers to advocate the use of building performance simulation (BPS) during that stage. This paper investigates non-manifold topology (NTM) as a novel approach to 3D modelling that has the potential to be highly compatible with the early design stages and with the input requirements for BPS. The proposed approach avoids the process of simplifying polyhedral models produced by Building Information Modelling (BIM) software to conduct BPS. In particular, NTM allows for a clear segmentation of a building, unambiguous space boundaries, and perfectly matched surfaces and glazing subsurfaces. The NTM approach was tested through a software prototype that integrates 3D modelling software and an energy simulation engine.
keywords	Early design stage, Non-manifold topology, Building performance simulation
series	ACADIA
type	normal paper
email
last changed	2022/06/07 07:50

_id	e26b
authors	Kalay, Yehuda E.
year	1983
title	Modeling Polyhedral Solids Bounded by Multi-Curved Parametric Surfaces
source	Computer Aided Design May, 1983. Vol. 15: pp. 141-146 : ill. includes bibliography.
summary	An integrated solids modelling system for representing and manipulating objects bounded by bicubic parametric surfaces is presented. Its basic capabilities include the representation of solids through a surface based model, such that the surface underlying any face can be replaced by another surface that has been modelled independently. Other functionalities include scaling, rotation and translation of shapes and their pairwise combination into more complex shapes by means of spatial set operators. This approach integrates within a single system the representation and manipulation of polyhedral solids bounded by multi-curved parametric surfaces, thereby combining solid modelling with surface modelling techniques
keywords	solid modeling, curves, curved surfaces, integration, systems, B-rep, intersection, boolean operations
series	CADline
email
last changed	2003/06/02 10:24

_id	ecaade2017_248
id	ecaade2017_248
authors	Liapi, Katherine, Papantoniou, Andreana and Nousias, Chrysostomos
year	2017
title	Square tessellation patterns on curved surfaces:In search of a parametric design method
doi	https://doi.org/10.52842/conf.ecaade.2017.2.371
source	Fioravanti, A, Cursi, S, Elahmar, S, Gargaro, S, Loffreda, G, Novembri, G, Trento, A (eds.), ShoCK! - Sharing Computational Knowledge! - Proceedings of the 35th eCAADe Conference - Volume 2, Sapienza University of Rome, Rome, Italy, 20-22 September 2017, pp. 371-378
summary	Methods for Tessellating a flat surface with regular or semi-regular patterns of polygons have already been addressed in literature and can be easily parameterized. For the tessellation of curved surfaces using patterns of one or more regular polygons there is not a uniquely defined approach to the problem within the context of architectural research and applications. This paper is focused on the tessellation of curved surfaces with square tiles, where the tessellation pattern consists of four squares with partly overlapping sides. In this study double curvature surfaces were considered first, and subsequently surfaces of more complex geometry such as minimal surfaces. Specifically, a method for the square tessellation of two types of doubly curved surfaces, the spherical and the ellipsoidal, is discussed and presented in the paper. In addition, the square tessellation of two types of minimal surfaces, the catenoid and the helicoid, have also been examined and presented. For each one of the surfaces that have been considered, an algorithm that generates the distribution of the planar square surfaces on the surface and renders possible the parametric description of the problem, was developed and presented in the paper. A discussion on boundary conditions for each developed method is also included. The Grasshopper visual programming language has been used for the parametric description and display of the results in a graphic environment. The research discussed in this paper can find application in several real world problems including surface paneling, or space packing of polyhedral structural units on a curved surface.
keywords	square tessellation, curved surface tiling, ellipsoid tessellation, minimal surfaces tessellation, geometric appxoximation methods
series	eCAADe
email
last changed	2022/06/07 07:59

_id	e655
authors	Paoluzzi, A., Pascucci, V. and Vicentino, M.
year	1995
title	Geometric programming: A programming approach to geometric design
source	ACM Transactions on Graphics
summary	This article presents a functional programming approach to geometric design with embedded polyhedral complexes. Its main goals are to show the expressive power of the language as well as its usefulness for geometric design. The language, named PLASM (the Programming LAnguage for Solid Modeling), introduces a very high level approach to "constructive" or "generative" modeling. Geometrical objects are generated by evaluating some suitable language expressions. Because generating expressions can be easily combined, the language also extends the standard variational geometry approach by supporting classes of geometric objects with varying topology and shape. The design language PLASM can be roughly considered as a geometry-oriented extension of a subset of the functional language FL. The language takes a dimension-independent approach to geometry representation and algorithms. In particular it implements an algebraic calculus over embedded polyhedra of any dimension. The generated objects are always geometrically consistent because the validity of geometry is guaranteed at a syntactical level. Such an approach allows one to use a representation scheme which is weaker than those usually adopted in solid modelers, thus encompassing a broader geometric domain, which contains solids, surfaces, and wire-frames, as well as higher-dimensional objects.
series	journal paper
last changed	2003/04/23 15:50

_id	47e7
authors	Segal, Mark and Sequin, Carlo H.
year	1988
title	PARTITIONING POLYHEDRAL OBJECTS INTO NONINTERSECTING PARTS
source	IEEE Computer Graphics and Applications. January, 1988. vol. 8: pp. 53-67 : ill. some col. includes bibliography
summary	The article describes an algorithm for partitioning intersecting polyhedrons into disjoint pieces and, more generally, removing intersections from sets of planar polygons embedded in three space. Polygons, or faces, need not be convex and may contain multiple holes. Intersections are removed by considering pairs of faces and slicing the faces apart along their regions of intersection. To reduce the number of face pairs examined, bounding boxes around groups of faces are checked for overlap. The intersection algorithm also computes set theoretic operations on polyhedrons. Information gathered during face cutting is used to determine which portions of the original boundaries may be present in the result of an intersection, a union, or a difference of solids. The method includes provisions to detect, and in some cases overcome, the effects of numerical inaccuracy on the topological decisions that the algorithm must make. The regions in which ambiguous results are possible are flagged so that the user can take appropriate action.
keywords	geometric modeling, computer graphics, objects, programming, hidden surfaces, hidden lines, business, practice, systems, user interface, UNIX
series	CADline
type	normal paper
last changed	2005/10/05 07:39

_id	d46d
authors	Takahashi, S., Shinagawa, Y. and Kunii, T.L.
year	1997
title	A Feature-Based Approach for Smooth Surfaces
source	Proceedings of Fourth Symposium on Solid Modeling, pp. 97-110
summary	Feature-based representation has become a topic of interest in shape modeling techniques. Such feature- based techniques are, however, still restricted to polyhedral shapes, and none has been done on smooth sur- faces. This paper presents a new feature-based ap- proach for smooth surfaces. Here, the smooth surfaces are assumed to be 2-dimensional @differentiable manifolds within a theoretical framework. As the shape features, critical points such as peaks, pits, and passes are used. We also use a critical point graph called the R.eeb graph to represent the topological skeletons of a smooth object. Since the critical points have close relations with the entities of B-reps, the framework of thtx B-reps can easily be applied to our approach. In our method, the shape design process begins with specifying the topological skeletons using the Reeb graph. The Reeb graph is edited by pasting the enti- ties called cells that have one-to-one correspondences with the critical points. In addition to the topological skeletons, users also design the geometry of the objects with smooth surfaces by specifying the flow curves that run on the object surface. From these flow curves, the system automatically creates a control network that encloses the object shape. The surfaces are interpolated from the control network by minimizing the allergy function subject to the deformation of the surfaces using variational optimization.
series	other
last changed	2003/04/23 15:50

_id	lasg_hylozoicground_2010_fulltext
id	lasg_hylozoicground_2010_fulltext
year	2010
title	Hylozoic Ground; Liminal Responsive Architecture
source	Hylozoic Ground; Liminal Responsive Architecture [ISBN 978-1-926724-02-7] Riverside Architectural Press: Toronto, Canada 2010.
summary	Introductory summary of developing Hylozoic Series, a collection of life-like architectural structures
keywords	Hylozoism, Hylozoic series, components, assemblies, design process
last changed	2019/07/29 14:00

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