Geometric sketch constraint solving with user feedback

Bridget M. Dixon, John F. Dannenhoffer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Modern Computer Aided Design systems rely on two-dimensional sketches as the basis for the creation of most three-dimensional geometry. These sketches consist of qualitative shape information as well as a series of constraints to quantify the exact size and shape of the various segments, arcs, and splines that comprise the sketch. Example constraints include overall lengths, symmetries, parallel and/or perpendicular segments, and arc radii. For a given sketch, there are many sets of constraints that unambiguously define the shape. Unfortunately, sometimes a user prescribes a set of constraints that do not allow the sketch to be solved. Providing feedback to the user as to how to change the constraint definitions to remedy the problem is still a largely-unsolved problem. Herein is described a series of techniques for helping a user diagnose sketch problems and provide to the user a series of options that will cause the sketch to be properly solved. The techniques are incorporated in the OpenCSM solid modeling system. Several sample cofigurations that use these techniques are shown, with a description of the user interaction that the system provides.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
StatePublished - Aug 19 2013
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: Jan 7 2013Jan 10 2013

Publication series

Name51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
CountryUnited States
CityGrapevine, TX
Period1/7/131/10/13

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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    Dixon, B. M., & Dannenhoffer, J. F. (2013). Geometric sketch constraint solving with user feedback. In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 (51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013).