Hierarchical Representation of Three-Dimensional Objects Using Verbal Models

Abstract

We present a formalism for the computer represent at ion of three- dimensional shapes, that has as its goal to facilitate man-machine communication using verbal, graphic, and visual means. With this method, pieces may be assembled hierarchically using any of several ways of specifying attachment. The primitives of the representation are generalized cylinders, and the creating of assemblies may make use of the axes inherent in the primitives. Generic models may be described that may leave some parameters or dimensions unspecified, so that when a specific instance of the model is described, those parameters may either be explicitly specified or take on default values. The axes of local coordinate frames may be given symbolic names. A set of computer programs translates descriptions of objects into polyhedral models and line drawings.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1979
Accession Number
ADA457781

Entities

People

  • Gerald J. Agin

Organizations

  • SRI International

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Assembly
  • Attachment
  • Availability
  • Classification
  • Computer Programs
  • Computers
  • Contracts
  • Information Operations
  • Instructions
  • Monitoring
  • Security
  • Standards
  • Three Dimensional

Fields of Study

  • Computer science

Readers

  • Calculus or Mathematical Analysis
  • Computer Science.
  • Structural Dynamics.

Technology Areas

  • AI & ML
  • AI & ML - Machine Learning Algorithms