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Accurate analytic approximations for real-time specular area lighting

Published: 31 July 2015 Publication History

Abstract

Accurate real-time rendering of specular surfaces is a challenging task when considering area light source illumination. The difficulty resides in the evaluation of a surface integral for which no practical solution exists except using expensive Monte Carlo methods. Recent techniques like the most representative point approach [Drobot 2014] alleviate this problem but make some accuracy trade-off to achieve real-time performance. We introduce analytic approximations for accurate real-time rendering of specular surfaces illuminated by polygonal light sources. Our solution is based on a reformulation of the contour integral [Arvo 1995] we approximate analytically with simple peak functions. In addition, using simple geometric operations, we extend the solution to handle more physically plausible BRDFs. Our solution works without any assumption on light source shape nor surface roughness, bringing real-time performances with a quality close to the ground truth.

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MP4 File (a68.mp4)

References

[1]
Arvo, J. 1995. Applications of irradiance tensors to the simulation of non-lambertian phenomena. In SIGGRAPH'95, 335--342.
[2]
Drobot, M. 2014. Physically based area lights. In GPU Pro 5.

Cited By

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  • (2016)Real-time polygonal-light shading with linearly transformed cosinesACM Transactions on Graphics10.1145/2897824.292589535:4(1-8)Online publication date: 11-Jul-2016
  • (2016)Physically Based Area Lighting Model for Real-Time AnimationComputer Vision and Graphics10.1007/978-3-319-46418-3_7(73-85)Online publication date: 10-Sep-2016

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  1. Accurate analytic approximations for real-time specular area lighting

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      cover image ACM Conferences
      SIGGRAPH '15: ACM SIGGRAPH 2015 Talks
      July 2015
      82 pages
      ISBN:9781450336369
      DOI:10.1145/2775280
      Permission to make digital or hard copies of part or all 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 third-party components of this work must be honored. For all other uses, contact the Owner/Author.

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      Published: 31 July 2015

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      View all
      • (2016)Real-time polygonal-light shading with linearly transformed cosinesACM Transactions on Graphics10.1145/2897824.292589535:4(1-8)Online publication date: 11-Jul-2016
      • (2016)Physically Based Area Lighting Model for Real-Time AnimationComputer Vision and Graphics10.1007/978-3-319-46418-3_7(73-85)Online publication date: 10-Sep-2016

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