When quantifying the surface texture of an optical component, it is important to define what level of spatial resolution is being measured. Surface texture, or the complete shape of a surface, can be broken down into three main spatial frequency groups: roughness, waviness, and figure.
In this study, efforts have been made to study the relation between the visual and instrumental gloss and the surface texture with quantitative methods by assessing the texture and optical behaviors of polymer surfaces.

The surface depicted on the right, in contrast, was textured with a planar projection of a linear intensity gradient, so that the local image intensity in each region is based on its position irrespective of its orientation.

TL;DR: This article dives into the fascinating physics of surface texture and ball rollingexplaining how roughness, friction, and material properties affect motion.
Surface texture refers to the characteristics of a materials outermost layer that can be observed and felt when touched or examined closely. It encompasses several key aspects, including surface roughness, waviness, and lay.