Formulated Silhouettes for Sketching Terrain

  • Authors:
  • J. C. Whelan;M. Visvalingam

  • Affiliations:
  • -;-

  • Venue:
  • TPCG '03 Proceedings of the Theory and Practice of Computer Graphics 2003
  • Year:
  • 2003

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Abstract

The mathematical definition of silhouettes withinNPAR is based on the assumption that they are the eye-centredprojections of occluding contours on an imagingplane. However, occluding contours are insufficient forsketching the silhouettes of hills as drawn bycartographers. The research reported in this paper isbased on the proposition that silhouettes are mentalvisualisations of the outlines of objects that arise fromknowledge and experience of the visual world. This paperdoes not seek to provide an alternative definition ofsilhouettes. Instead, it tests the proposition that missingsilhouette elements should be drawn on those visiblesurfaces brought into view through adoption of a higherviewpoint.