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The Computer Journal 1989 32(1):86-89; doi:10.1093/comjnl/32.1.86
© 1989 by British Computer Society
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Generalizing Active Zones for Set-Theoretic Solid Models

A. R. Halbert, S. J. P. Todd and J. R. Woodwark *

IBM UK Scientific Centre, Athelstan House, St Clement Street, Winchester, SO23 9DR, UK

A major drawback of the set-theoretic solid model is the global and non-unique way in which it is defined. In a recent paper, Rossignac and Voelcker5 introduced the concept of the active zone of a primitive or sub-model, which provides a localization of a set-theoretic model which is useful for a number of purposes. We present a more general, but simplified, definition of the active zone which exploits the properties of the symmetric difference operator. We also outline a novel application of the active zone to the interactive graphical editing of set-theoretic solid models.

Received April 1987. revised May 1987.

* IBM UK Scientific Centre, Athelstan House, St Clement Street, Winchester, SO23 9DR


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