Distance fog is a technique used in 3D computer graphics to enhance the perception of distance by simulating fog.
Because many of the shapes in graphical environments are relatively simple, and complex shadows are difficult to render, many graphics engines employ a "fog" gradient so objects further from the camera are progressively more obscured by haze and by aerial perspective. This technique simulates the effect of light scattering, which causes more distant objects to appear lower in contrast, especially in outdoor environments.
"Fogging" is another use of distance fog in mid-to-late 1990s games, when processing power was not enough to render far viewing distances, and clipping was employed. However, the effect could be very distracting since bits and pieces of polygons would flicker in and out of view instantly, and by applying a medium-ranged fog, the clipped polygons would fade in more realistically from the haze, even though the effect may have been considered unrealistic in some cases (such as dense fog inside of a building). Many early Nintendo 64 and PlayStation games used this effect, as in Turok: Dinosaur Hunter, Bubsy 3D, Star Wars: Rogue Squadron, Tony Hawk's Pro Skater, and Superman. The game Silent Hill uniquely worked fogging into the game's storyline, with the eponymous town being consumed by a dense layer of fog as the result of the player having entered an alternate reality. The application of fogging was so well received as an atmospheric technique that it has appeared in each of the game's sequels, despite improved technology negating it as a graphical necessity.
Famous quotes containing the words distance and/or fog:
“Though there were numerous vessels at this great distance in the horizon on every side, yet the vast spaces between them, like the spaces between the stars,—far as they were distant from us, so were they from one another,—nay, some were twice as far from each other as from us,—impressed us with a sense of the immensity of the ocean, the “unfruitful ocean,” as it has been called, and we could see what proportion man and his works bear to the globe.”
—Henry David Thoreau (1817–1862)
“Let us go in; the fog is rising.”
—Emily Dickinson (1830–1886)