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Atmospheric depth effects that fade distant objects and fill environments with haze, mist, and moody obscurity.
Fog in games serves both aesthetic and practical purposes. Artistically, fog creates atmosphere, mood, and depth, a misty forest feels different from a clear one. Practically, fog hides the draw distance limit where objects stop being rendered, disguising LOD transitions and pop-in. Simple distance-based fog linearly fades objects to a solid color. Height fog varies density based on altitude, pooling in valleys and thinning at mountain peaks. Volumetric fog simulates light scattering through actual 3D fog volumes, creating the most realistic results but at the highest cost. Modern games often layer multiple fog types: a base atmospheric haze, local fog volumes for specific areas, and volumetric effects for dramatic light interaction.
Example
Silent Hill's iconic fog was originally a technical limitation on PS1 hardware to hide draw distance, but it became the series' defining visual and atmospheric element. Bloodborne uses fog and mist masterfully to create its oppressive Gothic atmosphere, with different districts of Yharnam having distinct fog densities. The Legend of Zelda: Breath of the Wild uses height-based fog to create stunning morning mist in valleys that burns off as the day progresses, adding to the game's natural atmosphere.
Why it matters
Fog is one of the oldest rendering tricks in gaming, but it has evolved from a technical necessity into an artistic tool. Understanding fog systems reveals how developers use atmosphere to set mood, guide exploration, and manage performance. A game's fog implementation often reveals as much about its artistic ambitions as its technical constraints.
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