A Composite BRDF Model for Hazy Gloss

P Barla, R Pacanowski, Peter Vangorp

Research output: Contribution to journalArticle (journal)peer-review

10 Citations (Scopus)
206 Downloads (Pure)


We introduce a bidirectional reflectance distribution function (BRDF) model for the rendering of materials that exhibit hazy reflections, whereby the specular reflections appear to be flanked by a surrounding halo. The focus of this work is on artistic control and ease of implementation for real-time and off-line rendering. We propose relying on a composite material based on a pair of arbitrary BRDF models; however, instead of controlling their physical parameters, we expose perceptual parameters inspired by visual experiments [VBF17]. Our main contribution then consists in a mapping from perceptual to physical parameters that ensures the resulting composite BRDF is valid in terms of reciprocity, positivity and energy conservation. The immediate benefit of our approach is to provide direct artistic control over both the intensity and extent of the haze effect, which is not only necessary for editing purposes, but also essential to vary haziness spatially over an object surface. Our solution is also simple to implement as it requires no new importance sampling strategy and relies on existing BRDF models. Such a simplicity is key to approximating the method for the editing of hazy gloss in real-time and for compositing.
Original languageEnglish
Pages (from-to)55-66
Number of pages12
JournalComputer Graphics Forum
Issue number4
Early online date20 Jul 2018
Publication statusPublished - Jul 2018


  • CCS Concepts
  • •Computing methodologies → Reflectance modeling


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