Image space shading of three-dimensional objects.

D. Gordon, R. A. Reynolds

Research output: Contribution to journalArticlepeer-review


Two-dimensional images of 3-D objects need shading to give depth. Traditional (object space) shading methods require extra data (normal vectors) to be stored with the object description, but when representations are obtained directly from measured data, these normal vectors may be expensive to compute and if the object is modified interactively they must be recomputed frequently. To simplify, a shading method is devised which uses only information available in image space, after coordinates have been transformed, hidden surfaces removed, and a complete pre-image of all objects has been assembled. This involves using both the distance from the light source and the surface orientation as the basis of shading. This theory and its implementation are discussed and examples of shaded images presented.-from Authors

Original languageEnglish
Pages (from-to)361-376
Number of pages16
JournalComputer Vision, Graphics, and Image Processing
Issue number3
StatePublished - 1985
Externally publishedYes

ASJC Scopus subject areas

  • General Environmental Science
  • General Engineering
  • General Earth and Planetary Sciences


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