Arthur Appel
ABSTRACT
Line drawings are the most common type of rendering used to convey geometrical description. This is due to the economy of preparing such drawings and the great information density obtainable. On a pure line drawing, that is where no attempt is made to specify or suggest shadows, tone or color, the lines rendered are either the intersection curves of surfaces or the contour curves of surfaces. The nature of these curves are adequately discussed in the literature 1 and in a previous report.2 In order to convey a realistic impression of an object or an assembly of objects, the segments of lines which cannot be seen by an observer are not drawn or are drawn dashed. Without specification of visibility a drawing is ambiguous. This paper presents a recently developed scheme for the determination of visibility in a line drawing which enables comparitively high speed calculation and excellent resolution.
- 1.J V S LUH and R M KROLAK A mathematic model for mechanical part description Comm ACM Feb 1965 125-129 Google Scholar
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- 2.A APPEL The visibility problem and machine rendering of solids IBM Research Report RC 1618 May 20 1966Google Scholar
- 3.E E ZAJAC Computer-made perspective movies as a scientific communication tool Comm ACM 7 March 1964 169-170 Google ScholarDigital Library
- 4.P LOUTREL Determination of hidden edges in polyhedral figures: convex case Technical Report 400-145 Laboratory for Electroscience Research N. Y. U. September 1966Google Scholar
- 5.L G ROBERTS Machine perception of three-dimensional solids Technical Report No 315 Lincoln Laboratory MIT May 1963Google Scholar
- 6.Y OKAYA Graphic display of crystal structures: an example of man-machine interaction IBM Research Report RC 1706 November 3 1966Google Scholar
- 7.R A WEISS BE VISION a package of IBM 7090 FORTRAN programs to draw orthographic views of combinations of plane and quadric surfaces JACM 13 April 1966 194-204 Google ScholarDigital Library
Index Terms
- The notion of quantitative invisibility and the machine rendering of solids
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