Surface texture can be described as a spectrum of spatial wavelengths. “Filtering” is the process to isolate the wavelengths that matter for our application.
But what does that really look like?
One way to visualize it is to think of sorting different sized stones. The size of the stones is analogous to the size of the surface features. In this short animation we show how we can use that analogy to visualize filtering into surface roughness, waviness, or as many bands as necessary for the application.
Music Midnight Walker, Wendy Marcini, epidemicsound.com