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IBM Journal of Research and Development  
Volume 20, Number 6, Page 582 (1976)
Nontopical Issue
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Procedural Representation of Three-dimensional Objects

by D. D. Grossman
A system of PL/I procedures has been written that permits geometric objects to be described hierarchically. The objects are themselves represented as PL/I procedures, allowing very general use of variables. By effectively intercepting subprogram calls, the system provides a means of modifying the semantics associated with any object without modifying the object's procedural description.
Related Subjects: Graphics; Programming, programs, and programming languages