Abstract — Physically based rendering of metallic and pearlescent appearance requires knowledge of the composition of paint or coating. However, sometimes composition is not available, while the Bi-directional Reflectance Distribution Function (BRDF) is measured from an actual sample. Such a situation invokes the inverse problem- to find a paint composition from a given BRDF. We solve this problem based on a two-layer paint model, where two basic kinds of pigments, flakes and microparticles, are separated in different layers. Because of this, appearance attributes- such as gloss, glitter, shade- are directly connected to the physical parameters of our model. Therefore, solution of the inverse problem can serve as a starting point for subsequent paint design that is done in appearancerelated rather than physical terms. Our solution involves two consecutive optimizations, which are calculated in real time on a contemporary PC. I
To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.