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 3cde
authors Alik, B.
year 1999
title A topology construction from line drawings using a uniform plane subdivision technique
source Computer-Aided Design, Vol. 31 (5) (1999) pp. 335-348
summary The paper describes an algorithm for constructing the topology from a set of line segments or polylines. The problem appears for example at land-maps that have been drawnby general-purpose drawing packages or captured from blue-prints by digitalisation. The solution comprises two steps; in the first step inconsistencies in the input data aredetected and removed, and in the second step the topology is constructed. The algorithm for topology construction consists of two phases: determination of a concave hull,and generation of polygons. It is shown that the running-time of the presented algorithm is better than O(n2), where n is the number of input points. Because of a largenumber of geometric elements being expected, the geometric search needed at the first step of the algorithm is speeded up by an acceleration techniquea uniform planesubdivision.
keywords Computational Geometry, Topology Construction, Uniform Space Subdivision
series journal paper
last changed 2003/05/15 19:33

_id ascaad2009_tellef_dannevig
id ascaad2009_tellef_dannevig
authors Dannevig, Tellef; Jostein Akre Thorvaldsen and Ramzi Hassan
year 2009
title Immersive Virtual Reality in Landscape Planning
source Digitizing Architecture: Formalization and Content [4th International Conference Proceedings of the Arab Society for Computer Aided Architectural Design (ASCAAD 2009) / ISBN 978-99901-06-77-0], Manama (Kingdom of Bahrain), 11-12 May 2009, pp. 349-364
summary In Norway there has been an increased focus on participatory planning the latter years. The public is now supposed to be included in the planning process. The documents which the public have access to usually consists of the project`s technical drawings. In some cases, the documents include perspective drawing or computer rendering supplied by the stakeholder. Most affected parties are non professional in terms of planning, and have little or no experience dealing with the plans. Therefore, the information they rely on most cases is the perspective images, which easily can be manipulated. A system that enables all parties engaged in the planning process to visualize planning scenarios in a much realistic way is therefore needed. Virtual Reality is a tool that enables the viewer to move freely in a three dimensional digital environment. In this virtual world, different levels of interactivity can be added. The Norwegian University of Life Sciences (UMB) has recently installed a new immersive Virtual Reality system based on the idea of ConCave theatre. This research study is making use of the new ConCave theatre in order to test whether VR can be used as an enhancement of the communication process between professionals and amateurs and between professionals. By presenting digital models of different level of detail to two subject groups consisting of students with planning background and two groups without such experience we first investigated perception in an immersive VR-environment.
series ASCAAD
last changed 2009/06/30 06:12

_id ecaade2012_60
id ecaade2012_60
authors Dierichs, Karola; Menges Achim
year 2012
title Material and Machine Computation of Designed Granular Matter: Rigid-Body Dynamics Simulations as a Design Tool for Robotically-Poured Aggregate Structures Consisting of Polygonal Concave Particles
source Achten, Henri; Pavlicek, Jiri; Hulin, Jaroslav; Matejovska, Dana (eds.), Digital Physicality - Proceedings of the 30th eCAADe Conference - Volume 2 / ISBN 978-9-4912070-3-7, Czech Technical University in Prague, Faculty of Architecture (Czech Republic) 12-14 September 2012, pp. 711-719
summary Loose granulates are a relevant yet rarely deployed architectural material system. Their significance lies in their capacity to combine fluid-like amorphousness with solid-like rigidity, resulting in potential architectural structures capable of continuous reconfi guration. In addition aggregates allow for functional grading. Especially if custom designed concave particles are used, full-scale architectural structures can be poured using a six-axis industrial robot, combining the precise travel of the emitter-head with the self-organizational capacity of granular substances. In this context, the paper proposes Rigid-Body Dynamics (RBD) simulations as a design-tool for the robotic pouring of loose granular structures. The notions of material and machine computation are introduced and RBD is explained in greater detail. A set of small tests is conducted to investigate the advantages and disadvantages of a specifi c RBD software. Conclusively, further areas of research are outlined.
wos WOS:000330320600076
keywords Material and machine computation; aggregate architectures; designed granulates; robotic pouring; Rigid-Body Dynamics
series eCAADe
last changed 2014/04/14 11:07

_id caadria2014_147
id caadria2014_147
authors Dounas, Theodoros and A. Benjamin Spaeth
year 2014
title Universal Dovetail Joint
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
last changed 2014/04/22 08:23

_id kozlov02_paper_eaea2007
id kozlov02_paper_eaea2007
authors Kozlo, Dmitri
year 2008
title Topological Method of Construction of Point Surfaces as Physical Models
source Proceedings of the 8th European Architectural Endoscopy Association Conference
summary The shape of architectural objects in general can be treated as an envelope – a two dimensional surface embedded into three dimensional space. We directly perceive only the surface as a synthesis of sequential “photo snaps” – the two dimensional imprints on a retina – a concave screen inside of our eyes. In 15th century Italian architect and theorist L. B. Alberti claimed that the architecture consists in the outlines and the structure (lineamenta et structura in the original Latin text). The visible shape (outlines) exists only because a directly not perceived structure determines it. Like Alberti, the modern mathematical theories of form distinguish the shape as an exterior surface and the form itself as an internal structure. This subtle difference becomes a very important subject in the relationship between a virtual and a physical model in the studies of architectural endoscopy.
keywords topology, manifold, knots, point surface, physical model
series EAEA
last changed 2008/04/29 18:46

_id 804b
authors Lee, S., Adams, T.M. and Ryoo, B.
year 1997
title A fuzzy navigation system for mobile construction robots
source Automation in Construction 6 (2) (1997) pp. 97-107
summary Fuzzy navigation systems control a robot by implementing a fuzzy logic controller (FLC). Fuzzy navigation systems are simpler to implement than other navigation systems because they can handle infinite navigation situations with a finite set of rules. Existing fuzzy navigation systems for path finding in an unknown environment tend to find the shortest path in convex obstacle fields, but fail when obstacles are concave or placed continuously in certain configurations. This paper presents a fuzzy navigation system that can escape from concave and maze-like obstacle fields in an unknown environment. The system combines a tangent algorithm for path planning with sets of linguistic fuzzy control rules. In particular, we introduce the control rules for a Tracking mode of the FLC and improvements to the commonly used, intuitively reasonable tangent algorithm.
series journal paper
last changed 2003/05/15 19:22

_id eea9
authors Weiler, Kevin
year 1980
title Polygon Comparison Using a Graph Representation
source SIGGRAPH '80 Conference Proceedings July, 1980. vol. 14 ;no. 3: pp. 10-18 : ill. includes bibliography.
summary All of the information necessary to perform the polygon set operations (union, intersection, and difference) and therefore polygon clipping can be generated by a single application of a process called polygon comparison. This process accepts two or more input polygons and generates one or more polygons as output. These output polygons contain unique homogenous areas, each falling within the domain of one or more input polygons. Each output polygon is classified by the list of input polygons in which its area may be found. The union contour of all input is also generated, completing all of the information necessary to perform the polygon set operations. This paper introduces a polygon comparison algorithm which features reduced complexity due to its use of a graph data representation. The paper briefly introduces some of the possible approaches to the general problem of polygon comparison including the polygon set and clipping problems. The new algorithm is then introduced and explained in detail. The algorithm is sufficiently general to compare sets of concave polygons with holes. More than two polygons can be compared at one time; all information for future comparisons of subsets of the original input polygon sets is available from the results of the initial application of the process. The algorithm represents polygons using a graph of the boundaries of the polygons. These graphs are imbedded in a two dimensional geometric space. The use of the graph representation simplifies the comparison process considerably by eliminating many special cases from explicit consideration. Polygon operations like the ones described above are useful in a variety of application areas, especially those which deal with problems involving two dimensional or projected two dimensional geometric areas. Examples include VLSI circuit design, cartographic and demographic applications, and polygon clipping for graphic applications such as viewport clipping, hidden surface and line removal, detailing, and shadowing
keywords boolean operations, clipping, graphs, polygons, computational geometry, algorithms
series CADline
last changed 1999/02/12 14:10

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