Editing Rendering (computer graphics) (section)

=== Geometric optics ===
Rendering is practically exclusively concerned with the particle aspect of light physics{{snd}} known as [[geometrical optics]]. Treating light, at its basic level, as particles bouncing around is a simplification, but appropriate: the wave aspects of light are negligible in most scenes, and are significantly more difficult to simulate. Notable wave aspect phenomena include diffraction (as seen in the colours of [[Compact disc|CDs]] and [[DVD]]s) and polarisation (as seen in [[Liquid-crystal display|LCDs]]). Both types of effect, if needed, are made by appearance-oriented adjustment of the reflection model.