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In Proceedings of MAM@EGSR

What is the Reddening Effect and does it really exist?

Olaf Clausen, Ricardo Marroquim, Arnulph Furhmann, and Holger Weigand

Left: In the first detector setup the sample is illuminated by collimated light. The scattered light is captured and coupled into a fiber cable by an achromatic lens. The fiber cable is connected to an Ocean Optics Spectrometer. — Right: In the second detector setup the achromatic lens is replaced by an integrating sphere from Thorlabs and the sample is illuminated by converged light.

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The simulation of light-matter interaction is a major challenge in computer graphics. Particularly challenging is the modelling of light-matter interaction of rough surfaces, which contain several different scales of roughness where many different scattering phenomena take place. There are still appearance critical phenomena that are weakly approximated or even not included at all by current BRDF models. One of these phenomena is the reddening effect, which describes a tilting of the reflectance spectra towards long wavelengths especially in the specular reflection. The observation that the reddening effect takes place on rough surfaces is new and the characteristics and source of the reddening effect have not been thoroughly researched and explained. Furthermore, it was not even clear whether the reddening really exists or the observed effect resulted from measurement errors. In this work we give a short introduction to the reddening effect and show that it is indeed a property of the material reflectance function, and does not originate from measurement errors or optical aberrations.

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Citation

Olaf Clausen, Ricardo Marroquim, Arnulph Furhmann, and Holger Weigand, What is the Reddening Effect and does it really exist?, In Proceedings of MAM@EGSR, pp. 27–30, 2019.

BibTex 

@inproceedings{bib:clausen:2019,
    author       = { Clausen, Olaf and Marroquim, Ricardo and Furhmann, Arnulph and Weigand, Holger },    
    title        = { What is the Reddening Effect and does it really exist? },
    booktitle    = { In Proceedings of MAM@EGSR },
    year         = { 2019 },
    pages        = { 27--30 },
    doi          = { 10.2312/mam.20191309 },
    dblp         = { conf/mam/ClausenMFW19 },
    url          = { https://publications.graphics.tudelft.nl/papers/129 },
}