Accession Number:

ADA158940

Title:

Describing Surfaces.

Descriptive Note:

Memorandum rept.,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB

Personal Author(s):

Report Date:

1985-01-01

Pagination or Media Count:

35.0

Abstract:

This paper continues our work on visual representations of three-dimensional surfaces. The theoretical component is a study of classes of surface curves as a source of constraint on the surface on which they lie, and as a basis for describing it. We analyze bounding contours, surface intersections, lines of curvature, and asymptotes. Our experimental work investigates whether the information suggested by our theoretical study can be computed reliably and efficiently. We demonstrate algorithms that compute lines of curvature of a Gaussian smoothed surface determine planar patches and umbilic regions extract axes of surfaces of revolution and tube surfaces. We report preliminary results on adapting the curvature primal sketch algorithms of Asada and Brady 1984 to detect and describe surface intersections.

Subject Categories:

  • Cybernetics
  • Bionics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE