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 ddss9835
authors Langelaan, J. Willem R.
year 1998
title Criteria for an object oriented library system of high僕evel parametric CADelements
source Timmermans, Harry (Ed.), Fourth Design and Decision Support Systems in Architecture and Urban Planning Maastricht, the Netherlands), ISBN 90-6814-081-7, July 26-29, 1998
summary The subject of this paper is the development of criteria and specifications for an object oriented library system of high僕evel parametric elements that have an integrated 2D and 3D representation. High僕evelelements are virtual representations of architectural elements such as windows, doors, etc. High僕evel parametric elements need few components to be flexible and easily customizable. The generalization ofeach element by its characteristic parts results in a substantial reduction in the number of polygons that must be processed by the computer during the 3D transformation, graphically clean 3D images and low demandon user intervention. Gestalt theory emphasizes the importance of contour lines for the perception of an element. The 杜inimalist symbolic representation will simplify contour lines that enhance perception. Theinherent flexibility and functionality of object oriented elements are augmented when the elements are rigorously developed as an object oriented library system, with classes and sub-classes of elements whichinherit characteristics of the parent膨lass. Attribute values of a parent膨lass give the user global control over all instances of that class and its sub膨lasses in the model痴 database. The concepts which SystemsTheory uses for making an abstraction of reality are analogous to the concepts used in object oriented programming. This paper describes how Systems Theory is used as tool to develop high僕evel parametric elements as a functionally and computationally efficient library system.
series DDSS
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