The EIGHT Manual: A System for Geometric Modelling and Three-Dimensional Graphics on the Lisp Machine.
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We describe a simple geometric modelling system called Eight which supports interactive creation, editing, and display of three-dimensional polyhedral solids. Perspective views of a polyhedral environment may be generated, and hidden surfaces removed. Eight proved useful for creating world models, and as an underlying system for modelling object interactions in robotics research and applications. It is documented here in order to make the facility available to others.