Predictive rendering of composite materials: a multi-scale approach

Abstract

Predictive rendering of material appearance means going deep into the understanding of the physical interaction between light and matter and how these interactions are perceived by the human brain. In this paper we describe our approach to predict the appearance of composite materials by relying on the multi-scale nature of the involved phenomena. Using recent works on physical modeling of complex materials, we show how to predict the aspect of a composite material based on its composition and its morphology. Specifically, we focus on the materials whose morphological structures are defined at several embedded scales. We rely on the assumption that when the inclusions in a composite material are smaller than the considered wavelength, the optical constants of the corresponding effective media can be computed by a homogenization process (or analytically for special cases) to be used into the Fresnel formulas.

µBRDF measurements over a tiny surface area using a goniospectrophotometer

“…One reason for this is that virtual prototyping is rapidly growing in popularity for engineering or marketing purposes in a variety of industries, including automobiles, cosmetics, and textiles. In virtual prototyping, better appearance representation is obtained by using the optical properties of a material at the micrometer scale to render the appearance of the material at a larger scale [1].…”

State-of-the-art review of solar design tools and methods for assessing daylighting and solar potential for building-integrated photovoltaics

“…In order to solve antialiasing of surfaces using high-level of details using microfacet models at all scales Dupuy et al proposed Linear Efficient Antialiased Displacement and Reflectance (LEADR) Mapping [175]. Multi-scale approach of rendering composite materials, whose morphological structures are defined at several embedded scales, using homogenization process was shown in [176]. The same tool -Ocean is even capable to calculate absorption in form of EQE of specific material in layered structure, which could find application in complex BIPV modules and novel PV cell technologies.…”