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

_id	ecaade2014_232
id	ecaade2014_232
authors	Daniel Baerlecken and Sabri Gokmen
year	2014
title	Emphatic Lines - Surface structuring based on Walter Crane's pattern making methods
doi	https://doi.org/10.52842/conf.ecaade.2014.2.107
source	Thompson, Emine Mine (ed.), Fusion - Proceedings of the 32nd eCAADe Conference - Volume 2, Department of Architecture and Built Environment, Faculty of Engineering and Environment, Newcastle upon Tyne, England, UK, 10-12 September 2014, pp. 107-114
summary	The paper introduces a method for structuring and ornamenting double-curved geometry, which is developed through the lens of Walter Crane. Crane's method for pattern making is based on underlying scaffolds and infill patterns for two dimensional surfaces. The presented research uses his method and applies it through digitals means to three dimensional surfaces. The scaffold is used to solve the problem of curvature: it creates flat facets. This approach is tested through a prototypical installation at the Musee d'Jurassien d'Art and d'histoire using aluminium sheet metal and water-jet cutting, but can also be transferred to other architectural applications.
wos	WOS:000361385100010
keywords	Tendrils; patterning; making; facets
series	eCAADe
email
last changed	2022/06/07 07:55

_id	cf2013_358
id	cf2013_358
authors	Gonzalez-Quintial, Francisco; Antonio Sanchez-Parandiet, and Javier Barrallo
year	2013
title	Freeform Surfaces Adaptation through Developable Surfaces Using Apparent Contours
source	Global Design and Local Materialization[Proceedings of the 15th International Conference on Computer Aided Architectural Design Futures / ISBN 978-3-642-38973-3] Shanghai, China, July 3-5, 2013, pp. 358-367.
summary	Free-form surfaces construction has been limited to the possibilities of graphical and constructive control. In a few years we have seen an important development of control of the form through digital graphic technology, software and hardware that allowed truly spectacular constructions. A significant researching way not only in architecture, but also in engineering even in sculpture, has been the adaptation of free forms through developable surfaces using different systems, many based on differential geometry. Reinterpreting some topics of projective geometry that allows the use of certain CAD software, jumping from the physical to the digital drawing system, has been developed a method allows the adaptation of free forms through developable surfaces using apparent contours that we can draw over these free form surfaces. Trough using them we can trace two types of developable surfaces as cones and cylinders that are touching the surface tangentially to this contours.
keywords	Freeform surfaces, Double curved surfaces, Developable surfaces, Algorithmic approach.
series	CAAD Futures
email
last changed	2014/03/24 07:08

_id	caadria2014_147
id	caadria2014_147
authors	Dounas, Theodoros and A. Benjamin Spaeth
year	2014
title	Universal Dovetail Joint
doi	https://doi.org/10.52842/conf.caadria.2014.409
source	Rethinking Comprehensive Design: Speculative Counterculture, Proceedings of the 19th International Conference on Computer-Aided Architectural Design Research in Asia (CAADRIA 2014) / Kyoto 14-16 May 2014, pp. 409–418
summary	The paper presents the geometrical investigation of a three-dimensional dovetail joint that can lead (timber) frame construction to more than two-dimensional frames; the creation of timber construction with timber members meeting at irregular angles can be shown to be feasible, simplifying overall construction. Traditional joints in timber construction usually work only in two dimensions, in other words in planar surfaces, resulting thus in complicated assemblies in three-dimensions. Stemming from traditional timber dovetail joints, the universal joint under investigation is produced under revolution of the geometry of a dovetail fastener through its middle axis. The resulting concave disk can connect timber elements under irregular angles, without the need for the structural members to lie in the same plane. The joint works due to friction between members rather than using any other element of bonding, allowing for the assembly of joints and structural members with no specialized tools. The paper explores the geometric constraints and degrees of freedom that such a disk creates in timber construction, and consequently in similar linear construction systems.
keywords	Universal Joint; timber construction; geometric investigation
series	CAADRIA
email
last changed	2022/06/07 07:55

_id	cdrf2023_526
id	cdrf2023_526
authors	Eric Peterson, Bhavleen Kaur
year	2023
title	Printing Compound-Curved Sandwich Structures with Robotic Multi-Bias Additive Manufacturing
doi	https://doi.org/https://doi.org/10.1007/978-981-99-8405-3_44
source	Proceedings of the 2023 DigitalFUTURES The 5st International Conference on Computational Design and Robotic Fabrication (CDRF 2023)
summary	A research team at Florida International University Robotics and Digital Fabrication Lab has developed a novel method for 3d-printing curved open grid core sandwich structures using a thermoplastic extruder mounted on a robotic arm. This print-on-print additive manufacturing (AM) method relies on the 3d modeling software Rhinoceros and its parametric software plugin Grasshopper with Kuka-Parametric Robotic Control (Kuka-PRC) to convert NURBS surfaces into multi-bias additive manufacturing (MBAM) toolpaths. While several high-profile projects including the University of Stuttgart ICD/ITKE Research Pavilions 2014–15 and 2016–17, ETH-Digital Building Technologies project Levis Ergon Chair 2018, and 3D printed chair using Robotic Hybrid Manufacturing at Institute of Advanced Architecture of Catalonia (IAAC) 2019, have previously demonstrated the feasibility of 3d printing with either MBAM or sandwich structures, this method for printing Compound-Curved Sandwich Structures with Robotic MBAM combines these methods offering the possibility to significantly reduce the weight of spanning or cantilevered surfaces by incorporating the structural logic of open grid-core sandwiches with MBAM toolpath printing. Often built with fiber reinforced plastics (FRP), sandwich structures are a common solution for thin wall construction of compound curved surfaces that require a high strength-to-weight ratio with applications including aerospace, wind energy, marine, automotive, transportation infrastructure, architecture, furniture, and sports equipment manufacturing. Typical practices for producing sandwich structures are labor intensive, involving a multi-stage process including (1) the design and fabrication of a mould, (2) the application of a surface substrate such as FRP, (3) the manual application of a light-weight grid-core material, and (4) application of a second surface substrate to complete the sandwich. There are several shortcomings to this moulded manufacturing method that affect both the formal outcome and the manufacturing process: moulds are often costly and labor intensive to build, formal geometric freedom is limited by the minimum draft angles required for successful removal from the mould, and customization and refinement of product lines can be limited by the need for moulds. While the most common material for this construction method is FRP, our proof-of-concept experiments relied on low-cost thermoplastic using a specially configured pellet extruder. While the method proved feasible for small representative examples there remain significant challenges to the successful deployment of this manufacturing method at larger scales that can only be addressed with additional research. The digital workflow includes the following steps: (1) Create a 3D digital model of the base surface in Rhino, (2) Generate toolpaths for laminar printing in Grasshopper by converting surfaces into lists of oriented points, (3) Generate the structural grid-core using the same process, (4) Orient the robot to align in the direction of the substructure geometric planes, (5) Print the grid core using MBAM toolpaths, (6) Repeat step 1 and 2 for printing the outer surface with appropriate adjustments to the extruder orientation. During the design and printing process, we encountered several challenges including selecting geometry suitable for testing, extruder orientation, calibration of the hot end and extrusion/movement speeds, and deviation between the computer model and the physical object on the build platen. Physical models varied from their digital counterparts by several millimeters due to material deformation in the extrusion and cooling process. Real-time deviation verification studies will likely improve the workflow in future studies.
series	cdrf
email
last changed	2024/05/29 14:04

_id	caadria2014_002
id	caadria2014_002
authors	Haeusler, M. Hank; Danny Nguyen and Margaret Goldsack
year	2014
title	Ruled Surface Media Facades
doi	https://doi.org/10.52842/conf.caadria.2014.689
source	Rethinking Comprehensive Design: Speculative Counterculture, Proceedings of the 19th International Conference on Computer-Aided Architectural Design Research in Asia (CAADRIA 2014) / Kyoto 14-16 May 2014, pp. 689–698
summary	Traditionally media facades have been created using 2D surfaces, not dissimilar to televisions. As computational architecture continues to explore non-Euclidian shapes it is a logical process to investigate the use and possibilities of emerging complex curved surfaces for the display of media content to match architectural design aspirations with demands of ubiquitous city concepts of penetrating surfaces with information. Drawing on existing architectural knowledge of ruled surfaces the paper outlines the implementation of adopting existing principles from architecture and mathematics to contemporary discussions in media architecture. It demonstrates that ruled surfaces can function as media facades by simulating ten different ruled surface types in Grasshopper and overlaying them with different video content. Based on the results the team proceeded to build a 1:1 prototype of a hyperbolic paraboloid to test if the simulated results in the computer matched with the physical model. The prototype was further tested using media content to observe the visibility of the display from various viewing positions. Based on the findings the paper concludes that ruled surface media facades are feasible. This investigation, its proposed hypothesis, methodology, implications, significance and evaluation are presented in the paper.
keywords	Media facades; responsive architecture; ruled surfaces; non-Euclidian spaces
series	CAADRIA
email
last changed	2022/06/07 07:49

_id	caadria2014_177
id	caadria2014_177
authors	Jonas, Katrin; Alan Penn and Paul Shepherd
year	2014
title	Designing with Discrete Geometry
doi	https://doi.org/10.52842/conf.caadria.2014.513
source	Rethinking Comprehensive Design: Speculative Counterculture, Proceedings of the 19th International Conference on Computer-Aided Architectural Design Research in Asia (CAADRIA 2014) / Kyoto 14-16 May 2014, pp. 513–522
summary	There has been a shift in aesthetics from the modern orthogonal building envelope to more elaborate curved and folded forms. Non_orthogonal forms are often associated with complete freedom of geometry, entrusting the advancement in custom manufacturing and robotic fabrication of one-off building parts to realise the design. This paper presents a methodology that allows non_orthogonal surfaces to be designed using a constrained library of discrete, tessellating parts. The method enables the designer both to produce ‘approximations’ of freeform designs in a top_down manner or to generate ‘candidate’ designs in a bottom_up process. It addresses the challenge in the field of design engineering to generate architectural surfaces which are complex, yet simple and economical to construct. The system relates to the notion that complexity derives from simple parts and simple rules of interaction. Here complexity relates to the holistic understanding of a structure as an interaction between its local parts, global form and visual, as well as functional performance.
keywords	Geometry system; form generation; form growth; discrete growth model; design tool; complex geometry
series	CAADRIA
email
last changed	2022/06/07 07:52

_id	sigradi2014_286
id	sigradi2014_286
authors	Pires, Janice de Freitas; Adriane Borda Almeida da Silva, Gabriela Gonzales Peronti, Mariana Osmaré
year	2014
title	Planificações Parametrizadas e Kirigami: Aproximações possíveis para o Estudo e a Representação de Superfícies Curvas [Parameterized flattening and Kirigami: Possible Approximations to the Study and the Representation of Curved Surfaces]
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. 265-270
summary	This paper demonstrates the process of generation of physical paper models from digital models of curved surfaces through the digital technique for approximately flattening. A collection of these models, based on works of architecture, is being produced as a didactic activity within a discipline of graphic and digital geometry in the curriculum of architecture. The study allowed the identification of parameters to improve the process of generating such models and recognize the kirigami technique as an alternative for the representation of non-developable rectilinearsurfaces, previously not included for the generation of physical models in the didactic activities in question.
keywords	Parameterized flattening; curved surfaces; paper models; kirigami. Planificações parametrizadas; superfícies curvas; modelos em papel
series	SIGRADI
email
last changed	2016/03/10 09:57

_id	caadria2014_090
id	caadria2014_090
authors	Schubert, Gerhard; Marcus Tönnis, Violin Yanev, Gudrun Klinker and Frank Petzold
year	2014
title	Dynamic 3D-Sketching
doi	https://doi.org/10.52842/conf.caadria.2014.107
source	Rethinking Comprehensive Design: Speculative Counterculture, Proceedings of the 19th International Conference on Computer-Aided Architectural Design Research in Asia (CAADRIA 2014) / Kyoto 14-16 May 2014, pp. 107–116
summary	Sketching by hand is without doubt – alongside building models – the most common tool that architects employ when designing. A disadvantage of the sketch is, even if it is a perspective drawing, that it is a purely two-dimensional planar representation of a three-dimensional product: the three-dimensional impression that the sketch communicates is a product of the viewer’s imagination. Digital modelling tools on the other hand support the creation of three-dimensional content but fall short in their ease of handling: their complexity and potentially unintuitive operation hinder rather than support the design process. Taking this discrepancy as a starting point, the presented system details the development and prototypical implementation of a dynamic 3D-sketching tool. The underlying core idea is to create a seamless connection between a perspective hand-sketch and the corresponding digital 3D-model in order to benefit from the advantages of hand sketching as a design tool and computer maintained 3D models. The system allows the designer to work as usual, visualizing his or her thoughts using perspective sketches. The user sketches on a touchscreen surface. The 2D drawing is automatically interpreted and converted into a system of 3D lines, surfaces and volumes in real-time.
keywords	Design Tool; Early Design Stages; 3D Sketching; Urban Design; HCI
series	CAADRIA
email
last changed	2022/06/07 07:57

_id	caadria2014_254
id	caadria2014_254
authors	Tuker, Cetin and Halil Erhan
year	2014
title	An Architectural Modeling Method for Game Environments and Visualization
doi	https://doi.org/10.52842/conf.caadria.2014.605
source	Rethinking Comprehensive Design: Speculative Counterculture, Proceedings of the 19th International Conference on Computer-Aided Architectural Design Research in Asia (CAADRIA 2014) / Kyoto 14-16 May 2014, pp. 605–614
summary	Modeling 3D architectural environments for games and design visualization is different than modelling for other purposes, such as for construction. These models include only the outer surfaces as ‘skin’ structures of the facades for rendering for which existing tools are too complex. After interviewing fourteen domain experts and evaluating available modelling tools, we observed a need for new modelling methods for rapid visualizations that leaves redundant model parts out for efficiency. We have developed a surface modelling method and a formalism for modelling architectural environments by slicing a building into layers with strips of façade element sequences. In the first prototype, we focused on parametric structures using userdefined architectonic vocabulary such as voids and solids. We conducted an expert review study with four participants: two user-experience and two domain experts. All participants responded that the method is easy to learn even for non-experts. Based on the tasks completed, they agreed that the method can speed the process of modelling large continuous façades, single-mass single-storey geometries, and repetitive floor layers; they also made suggestions for improvement. The results from the initial evaluation show that the method presented has some merits to be used in practice.
keywords	3D modelling; facade reconstruction; game; visualization
series	CAADRIA
email
last changed	2022/06/07 07:57

_id	ecaadesigradi2019_149
id	ecaadesigradi2019_149
authors	Gonzalez-Quintial, Francisco and Martin-Pastor, Andres
year	2019
title	Convolutas - Developable strips and digital fabricated lightweight architecture
doi	https://doi.org/10.52842/conf.ecaade.2019.1.585
source	Sousa, JP, Xavier, JP and Castro Henriques, G (eds.), Architecture in the Age of the 4th Industrial Revolution - Proceedings of the 37th eCAADe and 23rd SIGraDi Conference - Volume 1, University of Porto, Porto, Portugal, 11-13 September 2019, pp. 585-594
summary	The present research is mainly focused on the development of a system that would be able to offer the potentiality of constructing free-form surfaces by using developable surfaces. Through a deep revision of pre-computational traditional geometric systems based on the classical Descriptive Geometry, after a re-interpretation that design and algorithmic generation tools allow by using computers and digital fabrication hardware as testing ground, a geometric control process has been designed in order to offer the possibility of managing double-curvature complex forms and their adaptation by using developable surfaces. The focal point of this system is proving how developable surfaces are suitable to build architectonical elements at real scale.
keywords	Geometry; Developable Surfaces; Algorithmic Approach; Digital Fabrication
series	eCAADeSIGraDi
email
last changed	2022/06/07 07:51

_id	4697
authors	Griffiths, J.G.
year	1978
title	A Surface Display Algorithm
source	Computer Aided Design. January, 1978. vol. 10: pp. 65-73 : ill. includes bibliography
summary	An algorithm is described for displaying curved surfaces with their hidden parts removed. The algorithm calculates a number of points on a surface at which the surface disappears from view, and joins the points to form a piece-wise smooth `critical boundary'. With a knowledge of this critical boundary, the task of displaying the visible parts of the surface becomes simple
keywords	algorithms, curved surfaces, representation, display, hidden lines, hidden surfaces, computer graphics
series	CADline
last changed	2003/06/02 13:58

_id	ecaadesigradi2019_345
id	ecaadesigradi2019_345
authors	Jovanovic, Marko, Vucic, Marko, Stulic, Radovan and Petrovic, Maja
year	2019
title	Design Guidelines for Zero Waste Manufacturing of Freeform EPS Facades
doi	https://doi.org/10.52842/conf.ecaade.2019.2.779
source	Sousa, JP, Xavier, JP and Castro Henriques, G (eds.), Architecture in the Age of the 4th Industrial Revolution - Proceedings of the 37th eCAADe and 23rd SIGraDi Conference - Volume 2, University of Porto, Porto, Portugal, 11-13 September 2019, pp. 779-788
summary	The application of curved facade designs in contemporary architectural practice has become adamant in combining the digital tools with the material properties. By expanding the focus to manufacturing as well, the topic of waste is introduced. In order to avoid the generation of waste material during fabrication, in this research a workflow is introduced which describes the design of freeform surfaces out of expanded polystyrene blocks (EPS), while producing zero waste. The main premise is that a piece cut out of an EPS block has a piece that is left inside the block, its complement. Following the premise, it is only necessary to design one half of the freeform surface over a desired facade area and the other part would align to it. After the freeform surface is generated, a tessellation process is described, prepared for robotic hotwire cutting, following the limitation of the EPS block dimension and the inclusion of the minimal insulating layer.
keywords	freeform surface; ruled surface approximation; minimal insulating layer; complements
series	eCAADeSIGraDi
email
last changed	2022/06/07 07:52

_id	ecaade2009_036
id	ecaade2009_036
authors	Tamke, Martin; Thomsen, Mette Ramsgard; Asut, Serdar; Josefsson, Kristoffer
year	2009
title	Translating Material and Design Space: Strategies to Design with Curved Creased Surfaces
doi	https://doi.org/10.52842/conf.ecaade.2009.385
source	Computation: The New Realm of Architectural Design [27th eCAADe Conference Proceedings / ISBN 978-0-9541183-8-9] Istanbul (Turkey) 16-19 September 2009, pp. 385-390
summary	This paper shares findings from the project DevA (Developable surfaces in Architecture), a research by design based project developed a collaboration between academic and industry partners. The project aims to investigate the use of curved sheet material in architecture using hybridised 3D modelling and pattern cutting techniques. The project investigates how digital design and fabrication technologies enable the development of new structural concepts through the new means of material specification and detailing at unprecedented levels of precision. The paper presents speculative research project as well as the demonstrator Reef Pattern.
wos	WOS:000334282200046
keywords	Complex surface design, CAD, material behavior in design, industrial and interdisciplinary collaboration, practice based research
series	eCAADe
email
last changed	2022/06/07 07:56

_id	caadria2023_73
id	caadria2023_73
authors	Awaji, Hiroki, Hayashi, Sei and Gondo, Tomoyuki
year	2023
title	Construction of a Free-Form Pavilion Using On-Site Plywood Bending With the Development of Fabrication Tools
doi	https://doi.org/10.52842/conf.caadria.2023.2.099
source	Immanuel Koh, Dagmar Reinhardt, Mohammed Makki, Mona Khakhar, Nic Bao (eds.), HUMAN-CENTRIC - Proceedings of the 28th CAADRIA Conference, Ahmedabad, 18-24 March 2023, pp. 99–108
summary	Buildings with complex shapes are increasingly being constructed using digital fabrication tools. However, many building components nevertheless require specialised skills for their assembly at the construction site, even if the manufacturing has been streamlined. In this study, by practising an agile design process that repeats the method of ‘Add-on the tool’ and ‘feedback on form and material, we devised a construction method that allows unskilled workers to be involved in the fabrication of pavilions and the creation of complex curved surfaces without requiring special skills, so long as the rules of assembly are determined. In this study, a method of achieving large curvatures using wire bending of Y-shaped wooden units made of 4-mm thick lauan veneer boards was proposed, in which large curvatures were used to design two-dimensionally curved surfaces with continuous wavy shapes. This method was also used to control the force applied to the wires by controlling their lengths. The free curved surface with the elastic bending of the plywood allowed a height of 2.3 m and a span of 6 m.
keywords	Add-on the tools, Agile development, Large-span Structure, Active Bending, Plywood, Curvature, Fabrication Tools
series	CAADRIA
email
last changed	2023/06/15 23:14

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

_id	ecaade2018_344
id	ecaade2018_344
authors	El-Gewely, Noor, Wong, Christopher, Tayefi, Lili, Markopoulou, Areti, Chronis, Angelos and Dubor, Alexandre
year	2018
title	Programming Material Intelligence Using Food Waste Deposition to Trigger Automatic Three-Dimensional Formation Response in Bioplastics
doi	https://doi.org/10.52842/conf.ecaade.2018.2.271
source	Kepczynska-Walczak, A, Bialkowski, S (eds.), Computing for a better tomorrow - Proceedings of the 36th eCAADe Conference - Volume 2, Lodz University of Technology, Lodz, Poland, 19-21 September 2018, pp. 271-278
summary	Bioplastics are by their very nature parametric materials, programmable through the selection of constituent components and the ratios in which they appear, and as such present significant potential as architectural building materials for reasons beyond sustainability and biodegradability. This paper presents a system through which rigid three-dimensional doubly curved hyperbolic paraboloid shapes are automatically formed from two-dimensional sheet casts by harnessing the inherent flexibility and expressiveness of bioplastics. The system uses a gelatin-based bioplastic supplemented with granular organic matter from food waste in conjunction with a split-frame casting system that enables the self-formation of three-dimensional geometries by directing the force of the bioplastic's uniform contraction as it dries. By adjusting the food waste added to the bioplastic, its properties can be tuned according to formal and performative needs; here, dehydrated granulated orange peel and dehydrated spent espresso-ground coffee are used both to impart their inherent characteristics and also to influence the degree of curvature of the resulting bioplastic surfaces. Multi-material casts incorporating both orange peel bioplastic and coffee grounds bioplastic are shown to exert a greater influence over the degree of curvature than either bioplastic alone, and skeletonized panels are shown to exhibit the same behavior as their solid counterparts. Potential developments of the technology so as to gain greater control of the curvature performance, particularly in the direction of computer-controlled additive manufacturing, are considered, as is the potential of application in architectural scale.
keywords	Bioplastics; Composites; Fabrication; Materials
series	eCAADe
email
last changed	2022/06/07 07:55

_id	ascaad2021_112
id	ascaad2021_112
authors	Hassab, Ahmed; Sherif Abdelmohsen, Mohamed Abdallah
year	2021
title	Generative Design Methodology for Double Curved Surfaces using AI
source	Abdelmohsen, S, El-Khouly, T, Mallasi, Z and Bennadji, A (eds.), Architecture in the Age of Disruptive Technologies: Transformations and Challenges [9th ASCAAD Conference Proceedings ISBN 978-1-907349-20-1] Cairo (Egypt) [Virtual Conference] 2-4 March 2021, pp. 622-635
summary	Despite recent approaches to generate unique surfaces using generative design algorithms, there are still challenges including teaching machines how to learn and manipulate surfaces, thus generating novel and unique versions, and exploring possible alternatives in producing unique surfaces using artificial intelligence. This paper proposes a generative design approach using Al. We propose a generative design methodology for producing novel and unique surfaces by faking input surfaces using artificial intelligence networks. This workflow is applied to two different artificial networks: (1) CycleGAN, (2) Pix2Pix and Augmentor. This experimentation is introduced to apply two real surfaces generating two fake surfaces as a unique version through the networks. Upon running the CycleGANs, Pix2Pix, and a Grasshopper script, the experiment results demonstrated how the proposed generative design methodology using AI produced a unique surface version with a higher level of manipulation and result control.
series	ASCAAD
email
last changed	2021/08/09 13:13

_id	4bd7
authors	Kalay, Yehuda E.
year	1981
title	Recursive Subdivision of Rectangular Bicubic Bezier Patches Using Patch Re-Parametrization
source	October, 1981. 7 p. : ill. includes bibliography
summary	This paper presents an analytical approach for the subdivision of curved surfaces made of rectangular patches, exploiting the properties of the Bernstein-Bezier surface representation. It is presented and demonstrated for the recursive subdivision of a patch into 4 sub-patches. It utilizes the linear dependency between the parametric vectors and the surface to re-parametrize the equation of the patch, and builds a quadtree of the patches. This method is useful for reducing the curvature of individual patches until some arbitrary criterion of planarity has been reached. Once reach, patches can be intersected analytically, to find the locus of intersection between two curved surfaces
keywords	recursion, algorithms, Bezier, parametrization, curves, curved surfaces, intersection
series	CADline
email
last changed	2003/06/02 13:58

_id	4e59
authors	Koparkar, P. A. and Mudur, S.P.
year	1986
title	Generation of Continuous Smooth Curves Resulting from Operations on Parametric Surface Patches
source	Computer Aided Design. May, 1986. pp. 193-206 : ill. includes bibliography
summary	In recent years a number of techniques based on the subdivision principle have been suggested for detecting the curves resulting from the intersection of two parametrically defined surface patches. Silhouette curves of surfaces can also be detected using analogous techniques. Usually the output is a set of pixels or line segments which form the complete curve, though not necessarily in an ordered manner. This paper presents data structures for maintaining the result of subdivision, and algorithms for tracing the curves in a continuous fashion. Using a few iterations of the Newton-Raphson technique the curve points may be refined to any required precision. For each point on the curve the nonlinear equations are chosen by looking at the local topological nature of the curve so as to guarantee convergence of the Newton-Raphson technique in one or two iterations
keywords	curved surfaces, parametrization, curves, intersection, relaxation, geometric modeling, computational geometry
series	CADline
last changed	2003/06/02 14:41

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