Mr. Matthieu Vallet Profile

Matthieu Vallet

at College de France

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Proceedings Article | 17 June 2003 Paper

Ecological model of glittering texture

Matthieu Vallet, Damien Paille, Annie Monot, Andras Kemeny

Proceedings Volume 5007, (2003) https://doi.org/10.1117/12.473934

KEYWORDS: Optical spheres, Eye, Mirrors, Light sources, Solid modeling, Visualization, Light, 3D modeling, Coastal modeling, Computer simulations

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The perceptual effects of changes of texture luminance either between the eyes or over time have been studied in several experiments and have led to a better comprehension of phenomenons such as sieve effect, binocular and monocular lustre and rivaldepth. In this paper, we propose an ecological model of glittering texture and analyze glitter perception in terms of variations of texture luminance and animation frequency, in dynamic illumination conditions. Our approach is based on randomly oriented mirrors that are computed according to the specular term of Phong's image rendering formula. The sparkling effect is thus correlated to the relative movements of the resulting textured object, the light array and the observer's point of view. The perceptual effect obtained with this model depends on several parameters: mirrors' density, the Phong specular exponent and the statistical properties of the mirrors' normal vectors. The ability to independently set these properties offers a way to explore a characterization space of glitter. A rating procedure provided a first approximation of the numerical values that lead to the best feeling of typical sparkling surfaces such as metallic paint, granite or sea shore.

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