Fig. 1.

(A) The three objects used to create the stimuli shown to participants. (B) The four experimental conditions: Glossy, Glossy Control, Rough, and Rough Control rendered on one example object. Specular components were shown in Glossy condition (90% diffuse and 10% glossy components) while the highlight areas were rotated and moved in the Control condition to break the impression of surface gloss. In the Rough condition, wave textures were applied on objects' 3-D geometry; in the Rough Control condition, the same wave textures were applied to the reflectance of the surface to create the impression of a smooth surface with a painted texture. Glossiness rating and rough rating results are presented, respectively, in (C) and (D) under five levels of the emission strength from the light source and five levels of wave texture scale. The bars reflect mean rating scores across 7 participants with ± 1 SEM.