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Generalization of Lambert's reflectance model

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Shree K. NayarAuthors Info & Claims

SIGGRAPH '94: Proceedings of the 21st annual conference on Computer graphics and interactive techniques

Pages 239 - 246

https://doi.org/10.1145/192161.192213

Published: 24 July 1994 Publication History

Abstract

Lambert's model for body reflection is widely used in computer graphics. It is used extensively by rendering techniques such as radiosity and ray tracing. For several real-world objects, however, Lambert's model can prove to be a very inaccurate approximation to the body reflectance. While the brightness of a Lambertian surface is independent of viewing direction, that of a rough surface increases as the viewing direction approaches the light source direction. In this paper, a comprehensive model is developed that predicts body reflectance from rough surfaces. The surface is modeled as a collection of Lambertian facets. It is shown that such a surface is inherently non-Lambertian due to the foreshortening of the surface facets. Further, the model accounts for complex geometric and radiometric phenomena such as masking, shadowing, and interreflections between facets. Several experiments have been conducted on samples of rough diffuse surfaces, such as, plaster, sand, clay, and cloth. All these surface demonstrate significant deviation from Lambertian behavior. The reflectance measurements obtained are in strong agreement with the reflectance predicted by the model.

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Mura AZambon FTosi FLopes RRathbun JPettine MAdriani AAltieri FCiarniello MCicchetti AFilacchione GGrassi DNoschese RMigliorini APiccioni GPlainaki CSordini RSindoni GTurrini D(2024)The temporal variability of Io’s hotspotsFrontiers in Astronomy and Space Sciences10.3389/fspas.2024.136947211Online publication date: 20-May-2024
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Index Terms

Generalization of Lambert's reflectance model
1. Applied computing
  1. Physical sciences and engineering
    1. Physics
2. Computing methodologies
  1. Artificial intelligence
    1. Computer vision
      1. Image and video acquisition
        3D imaging
  2. Computer graphics

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cover image ACM Conferences

SIGGRAPH '94: Proceedings of the 21st annual conference on Computer graphics and interactive techniques

July 1994

512 pages

ISBN:0897916670

DOI:10.1145/192161

Chairmen:
Dino Schweitzer
US Air Force Academy, Colorado
,
Andrew Glassner,
Mike Keeler

Copyright © 1994 ACM.

Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Published: 24 July 1994

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SIGGRAPH '94 Paper Acceptance Rate 57 of 242 submissions, 24%;

Overall Acceptance Rate 1,822 of 8,601 submissions, 21%

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https://doi.org/10.3389/fspas.2024.1369472
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https://doi.org/10.2493/jjspe.90.325
Xu KCavalier ABringier BRibardière MMeneveaux D(2024)Virtually measuring layered material appearanceJournal of the Optical Society of America A10.1364/JOSAA.51460441:5(959)Online publication date: 25-Apr-2024
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