BRDF Models for Accurate and Efficient Rendering of Glossy Surfaces

Joakim Löw, Joel Kronander, Anders Ynnerman, Jonas Unger
ACM Transactions on Graphics (TOG), Volume 31, Number 1, page 9:1--9:14 - January 2012
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This paper presents two new parametric models of the Bidirectional Reflectance Distribution Function (BRDF), one inspired by the Rayleigh-Rice theory for light scattering from optically smooth surfaces, and one inspired by micro-facet theory. The models represent scattering from a wide range of glossy surface types with high accuracy. In particular, they enable representation of types of surface scattering which previous parametric models have had trouble modelling accurately. In a study of the scattering behaviour of measured reflectance data, we investigate what key properties are needed for a model to accurately represent scattering from glossy surfaces. We investigate different parametrizations and how well they match the behaviour of measured BRDFs. We also examine the scattering curves which are represented in parametric models by different distribution functions. Based on the insights gained from the study, the new models are designed to provide accurate fittings to the measured data. Importance sampling schemes are developed for the new models, enabling direct use in existing production pipelines. In the resulting renderings we show that the visual quality achieved by the models matches that of the measured data.

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BibTex references

@Article\{LKYU12,
  author       = "L\öw, Joakim and Kronander, Joel and Ynnerman, Anders and Unger, Jonas",
  title        = "BRDF Models for Accurate and Efficient Rendering of Glossy Surfaces",
  journal      = "ACM Transactions on Graphics (TOG)",
  number       = "1",
  volume       = "31",
  pages        = "9:1--9:14",
  month        = "January",
  year         = "2012"
}

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