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Abstract

In virtually all rendering systems, linear light sources are modeled with a series of point light sources that require considerable computing resources to produce realistic looking results. A general solution for shading surfaces illuminated by a linear light source is proposed. A formulation allowing for faster computation of the diffuse component of light reflection is derived. By assuming Phong's specular component, simple, inexpensive and convincing results are produced with the use of a Chebyshev approximation. A shadowing algorithm is also presented. As shadowing from linear light sources is expensive, two acceleration schemes, extended from ray tracing, are evaluated.

BibTeX entry

@Article{Poulin:1991:SSL,
  author =       "Pierre Poulin and John Amanatides",
  title =        "Shading and shadowing with linear light sources",
  journal =      "Computers and Graphics",
  volume =       "15",
  number =       "2",
  pages =        "259--265",
  year =         "1991",
  coden =        "COGRD2",
  ISSN =         "0097-8493",
  bibdate =      "Wed Feb 5 07:22:58 MST 1997",
  acknowledgement = ack-nhfb,
  affiliation =  "Univ of British Columbia",
  affiliationaddress = "Vancouver, BC, Can",
  annote =       "Eurographics '90 award paper.",
  classification = "723; 741; 921",
  journalabr =   "Comput Graphics (Pergamon)",
  keywords =     "Computer Graphics --- Three Dimensional Graphics;
                 Graphic Methods --- Research; Lambert's Laws; Light
                 Sources; Linear Light Source Shading And Shadowing;
                 Mathematical Techniques --- Chebyshev Approximation;
                 Models; Shadowing Algorithms",
}

@InProceedings{Poulin:1990:SSL,
  author =       "Pierre Poulin and John Amanatides",
  title =        "Shading and Shadowing with Linear Light Sources",
  pages =        "377--386",
  booktitle =    "Eurographics '90",
  year =         "1990",
  month =        sep,
  editor =       "C. E. Vandoni and D. A. Duce",
  publisher =    "North-Holland",
  conference =   "European Computer Graphics Conference and Exhibition;
                 held in Montreux, Switzerland; 3 -- 7 September 1990",
  keywords =     "illumination",
}

Online Version