A feature at any node in the hierarchy is defined in terms of instances of multiple sub-features combined using any object construction function of the kernel. Thus, the disjoint cellular structure of a modern solid modelling kernel is enhanced to include a hierarchy of geometrically overlapping features. They are geometric structures that support such applications. Unlike most features in the literature, the features of this paper are not design features, manufacturing features or features for any other specific application. It is intended that most of the functions required for the manipulation of features can be provided by overloaded kernel functions new functions are necessary only to provide feature specific operations. It assumes that implementations of the proposed functions will make use of a solid modelling kernel that supports objects with a disjoint cellular structure and persistent cell identifiers. These definitions are used as the basis of a suite of functions to support feature modelling. A kernel for geometric features A kernel for geometric featuresĪ kernel for geometric features Alan Middleditch and Chris Keade Centre for Geometric Modelling and Design Brunei University, Uxbridge UBS 3PH UK Abstract This paper provides a rationale for its abstract data definitions of geometric features.
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