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	a5dc
authors	Adams, J.A.
year	1974
title	Cubic Spline Curve Fitting with Controlled End Conditions
source	Computer Aided Design. January, 1974. vol. 6: pp. 2-9 : ill. includes a short bibliography
summary	Another method for cubic spline curve fitting. It is a more flexible version of a proven technique by using a set of end conditions suggested by Nutbourne. The advantages and disadvantages of several techniques are clarified and sample graphical output is given. The result should be of interest to users of inexpensive computer graphics equipment who are interested in improving passive graphical output
keywords	computer graphics, curved surfaces, curves, splines
series	CADline
last changed	2003/06/02 13:58

_id	ecaade2022_299
id	ecaade2022_299
authors	Bauscher, Erik, Philipp, Klaus Jan, Reisinger, Stefanie and Wortmann, Thomas
year	2022
title	Reimagining Gego: Geometrical Reconstruction of Nubes, an Undocumented and Lost Sculpture from 1974
doi	https://doi.org/10.52842/conf.ecaade.2022.2.217
source	Pak, B, Wurzer, G and Stouffs, R (eds.), Co-creating the Future: Inclusion in and through Design - Proceedings of the 40th Conference on Education and Research in Computer Aided Architectural Design in Europe (eCAADe 2022) - Volume 2, Ghent, 13-16 September 2022, pp. 217–226
summary	This paper describes a method to understand and digitally reconstruct two sculptures by Gertrud Goldschmidt, a German-born, Venezuelan artist also called Gego. Gego is best known for her series of works called “Reticuláres”. These three-dimensional and open installations, mostly hanging freely in space, are playing with the concept and perception of space as well as challenging the definition of the traditional sculpture. The paper aims to generate information about two specific structures called “Nubes” (Clouds for Spanish) to assist in a physical reconstruction for a larger exhibition about Gego and to contribute to understanding Gego’s work process. Originally, the structures were suspended from a building's ceiling as an art installation in Caracas, 1974. There are three main challenges for this reconstruction: (1) The installations exhibit a complex three-dimensional geometry. (2) Scant drawings and photographs exist. (3) Gego might not have followed her initial drawings completely when building Nubes physically, because of the mentioned complexity and due to the light and bendable material properties of the employed material. The paper describes a computational process that recreates the object’s geometry in four steps: (1) Analyse all existing media of the structure. (2) Translate found information to the digital environment of Grasshopper. (3) Use a physical simulation to derive the end state of the hanging structure. (4) Optimize and tune the simulation with an optimization algorithm for better results. This paper demonstrates the usefulness of computational tools for reconstructing lost sculptures with little documentation. In this case, these tools allow a more accurate reconstruction and contribute to a fuller understanding of the design and realization process of Gego's Nubes.
keywords	Geometry Reconstruction, Lost Art, Computational Design, Physics Simulation
series	eCAADe
email
last changed	2024/04/22 07:10

_id	4156
authors	Freeman, Herbert
year	1974
title	Computer Processing of Line-Drawing Images
source	March, 1974. vol. 6: pp. 57-97 : ill. includes bibliography
summary	This paper describes various forms of line drawing representation, compares different schemes of quantization, and reviews the manner in which a line drawing can be extracted from a tracing or a photographic image. The subjective aspects of a line drawing are examined. Different encoding schemes are compared, with emphasis on the so-called chain code which is convenient for highly irregular line drawings. The properties of chain-coded line drawings are derived, and algorithms are developed for analyzing line drawings to determine various geometric features. Procedures are described for rotating, expanding, and smoothing line structures, and for establishing the degree of similarity between two contours by a correlation technique. Three applications are described in detail: automatic assembly of jigsaw puzzles, map matching, and optimum two-dimensional template layout
keywords	image processing, computer graphics, B-rep, mapping
series	CADline
last changed	1999/02/12 15:08

_id	6d19
authors	Reggini, Horacio C.
year	1974
title	A Computer Program for Drawing Non- Classical Perspectives
source	International Conference and Exhibition on Computers in Engineering and Building Design September, 1974. 5 p. ; [2]p. of ill.
summary	This article deals with a new way of portraying a three- dimensional object on a two-dimensional plane surface. In classical perspective each point of an object or scene is projected upon a plane by means of a bundle of straight projection rays departing from a unique point or point of view. The author proposes a similar procedure except that the straight projection rays of classical perspective are replaced with special curved ones
keywords	drawings, perspective, computer graphics
series	CADline
last changed	2003/06/02 13:58

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