Fast Spectral Upsampling of Volume Attenuation Coefficients

Jendersie, Johannes

doi:10.1007/978-1-4842-7185-8_13

Cited by 1 publication

(2 citation statements)

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“…In computer graphics, the use of a spectral renderer requires to convert between colors and spectra [FHL * 18, WLA*22]. Usually, the aim is to convert RGB textures (such as albedo maps, environment maps) to spectral textures with one spectral curve per texel – a one‐to‐one mapping [Pee93, Smi99, OYH18,MY19,JH19,GGDG22,Jen21,TWF22]. The difference between those approaches mostly resides in how spectra are built.…”

Section: Previous Workmentioning

confidence: 99%

“…However, the generation of spectral material properties presents a challenge for artists and designers [WLA * 22]. To ease the edition of reflectance and transmittance spectra, several spectral upsampling methods have been introduced in computer graphics [Pee93, Smi99, OYH18, MY19, JH19, GGDG22, Jen21]. They produce spectra from colors, ensuring that physical bounds are achieved (e.g., reflectances must lie in the [0,1] range).…”

Section: Introductionmentioning

confidence: 99%

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One‐to‐Many Spectral Upsampling of Reflectances and Transmittances

Belcour

Barla

Guennebaud

2023

Computer Graphics Forum

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Spectral rendering is essential for the production of physically‐plausible synthetic images, but requires to introduce several changes in the content generation pipeline. In particular, the authoring of spectral material properties (e.g., albedo maps, indices of refraction, transmittance coefficients) raises new problems. While a large panel of computer graphics methods exists to upsample a RGB color to a spectrum, they all provide a one‐to‐one mapping. This limits the ability to control interesting color changes such as the Usambara effect or metameric spectra. In this work, we introduce a one‐to‐many mapping in which we show how we can explore the set of all spectra reproducing a given input color. We apply this method to different colour changing effects such as vathochromism – the change of color with depth, and metamerism.

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