Global illumination (GI), or indirect illumination, refers to a group of algorithms used in 3D computer graphics meant to add more realistic lighting to 3D scenes. Such algorithms take into account not only the light that comes directly from a light source (direct illumination), but also subsequent "bounces" where light rays are reflected by other surfaces in the scene (indirect illumination).
Global illumination (GI), or indirect illumination, refers to a group of algorithms used in 3D computer graphics meant to add more realistic lighting to 3D scenes. Such algorithms take into account not only the light that comes directly from a light source (direct illumination), but also subsequent "bounces" where light rays are reflected by other surfaces in the scene (indirect illumination).
Source: Wikipedia "Global illumination" · CC BY-SA 4.0
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