Abstract
The techniques employed in geometric modelling in computer-aided design have been subject to great changes over the last two decades. This evolution over the years may be broken into four generations: modelling of drawings; surfaces; solid shapes; and finally, knowledge-based modelling of solid shapes. This paper commences with an introduction to topology. Then knowledge engineering and its place in reasoning about objects and spaces is explored. Topology-1, which belongs to the fourth category of geometric modellers, is introduced. It is the prototype core element for an interactive knowledge-based computer-aided architectural design system to support the design activity of an architect. The configuration of topology-1 is explained and each component is elaborated. Finally the reasoning capability of the system is illustrated by some queries about a house designed by Frank Lloyd Wright.
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