Mechanisms of persistent identification of topological entities in CAD systems: a review

Shahjadi Hisan Farjana*, Soonhung Han

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

10 Citations (Scopus)
161 Downloads (Pure)


Parametric CAD modelling systems requires the successful CAD model creation and modification in the product design phase. It demands persistent identification of topological entities, retrieving faces, edges, and vertexes are done with those entities specific unique names called persistent IDs. Those names should contain their unique properties which would be unambiguous among topological entities. In this paper, we are going to present reviews of existing persistent identification mechanisms and discuss their merits and demerits based on topology based approach, geometry based approach, or a combination of both ones. This review paper tries to define persistent identification mechanism not simply by topology and geometry but by their unique properties like feature orientation based persistent identification, faceIDGraph based persistent identification etc. Previous papers classified the persistent identification mechanism by only the topological or geometrical properties of entities which are too simple to understand the inside merits and demerits of that method. This paper also identifies the advantages and limitations of the current persistent identification approaches while suggesting a new approach should be developed consisting of both topology and geometry based approach. This paper also suggests the future direction of persistent identification of parametric CAD models and their entities.

Original languageEnglish
Pages (from-to)2837-2849
Number of pages13
JournalAlexandria Engineering Journal
Issue number4
Publication statusPublished - Dec 2018

Bibliographical note

Copyright the Publisher 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


  • Feature based CAD
  • Persistent identification
  • Topology
  • Geometry
  • Topological entity


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