Spectral imaging in production

Weidlich, Andrea; Forsythe, Alexandra; Dyer, Scott D.; Mansencal, Thomas; Hanika, Johannes; Wilkie, Alex; Emrose, Luke; Langlands, Anders

doi:10.1145/3450508.3464582

Cited by 6 publications

(1 citation statement)

References 37 publications

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“…This limitation restricts the possibilities that spectral rendering offers. Indeed, unlike RGB materials, spectral materials offer the possiblity to produce subtle color effects, such as metamerism – a change of color due to different illuminants [WFD * 21]. In the optics community, Metameric blacks [Wys58, FM05] have been introduced to explore the space of metamers.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

One‐to‐Many Spectral Upsampling of Reflectances and Transmittances

Belcour

Barla

Guennebaud

2023

Computer Graphics Forum

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A method for modeling volumetric clouds and subsurface scattering of functionally specified objects

Vyatkin

Dolgovesov

2023

E3S Web of Conf.

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Accurate modeling of light transfer in media is important in many fields, such as scientific visualization, medical imaging, synthesis of realistic images, and so on. Complex volumetric structures and translucent materials are used. Light scattering in media is responsible for the appearance of many materials. However, accurate and efficient modeling of lighting effects is a difficult problem. This requires solving not only the visualization equation, but also its volumetric solution, the radiation transfer equation. A method for modeling subsurface scattering of functionally specified objects is presented. The method allows you to simulate the transfer of light in chromatic media. To do this, a modified free-range distribution is used. This allows you to minimize the deviations of the bandwidth of the path. As a result, the variance of the estimate is reduced. The collision coefficients depending on the wavelength are effectively processed. As a result, it is possible to simulate volumetric clouds and subsurface light scattering in translucent materials such as marble, wax, leather, etc. The control coefficients and free run sampling are based on the minimum and maximum values in the media found by random sampling over a short preliminary pass. Reducing the rendering time is achieved by using a different distribution of paths.

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