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Sketching Shadows and Highlights to Position Lights

Pierre Poulin, Karim Ratib, and Marco Jacques
Proc. Computer Graphics International 97, June 1997


In inverse shading, a user provides information about the desired shading as he would like it to appear in the final image. The computer then interprets this information to identify the best values for the various shading parameters that would lead to the desired visual effect.

In this paper, we introduce an approach based on "sketching" in order to position light sources. Point light sources are positioned by sketches of shadows or highlights. Extended light sources are positioned by sketches of umbra or penumbra. The resulting system allows to quickly position light sources and to refine their positions interactively and more intuitively.

BibTeX entry

  author =      "Pierre Poulin and Karim Ratib and Marco Jacques ",
  title =       "Sketching Shadows and Highlights to Position Lights",
  pages =       "56--63",
  booktitle =   "Proceedings of Computer Graphics International 97",
  month =       jun,
  year =        "1997",
  publisher =   "IEEE Computer Society",
  keywords =    "",
  annote =      "",

Online Version

Postscript available here