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Sky conditions are estimated in terms of how many eighths of the sky are covered in cloud, ranging from 0 oktas (completely clear sky) through to 8 oktas (completely overcast). In addition, in the SYNOP code there is an extra cloud cover indicator '9' indicating that the sky is totally obscured (i.e. hidden from view), usually due to dense fog ...
Overcast or overcast weather, as defined by the World Meteorological Organization, is the meteorological condition of clouds obscuring at least 95% of the sky. [1] However, the total cloud cover must not be entirely due to obscuring phenomena near the surface, such as fog .
Sky luminance distribution models have been recommended by the International Commission on Illumination (CIE) for the design of daylighting schemes. Recent developments relate to “all sky models” for modelling sky luminance under weather conditions ranging from clear sky to overcast .
3D animation of ambient occlusion enabled on the animation to the right. In the absence of hardware-assisted ray traced ambient occlusion, real-time applications such as computer games can use screen space ambient occlusion (SSAO) techniques such as horizon-based ambient occlusion including HBAO and ground-truth ambient occlusion (GTAO) as a faster approximation of true ambient occlusion ...
It is also called sky radiation, the determinative process for changing the colors of the sky. Approximately 23% of direct incident radiation of total sunlight is removed from the direct solar beam by scattering into the atmosphere; of this amount (of incident radiation) about two-thirds ultimately reaches the earth as photon diffused skylight ...
Shadows is a software package for the calculation and drawing of sundials and astrolabes, available as a freeware in its base level. It has been developed by François Blateyron , software developer and amateur astronomer, who made it available on Internet since 1997 and continues to improve it. [ 1 ]
The basic rule is, "On a sunny day set aperture to f /16 and shutter speed to the [reciprocal of the] ISO film speed [or ISO setting] for a subject in direct sunlight." [1] In simplest terms, bright sun = f:16 @ 1/film-speed-number (aperture and shutter speed, respectively).
DarkPlaces – A significantly modified engine used in several standalone games and Quake mods. [9] [10] Although the last stable release was on May 13, 2014, it has received numerous updates through its SVN repository since then. [11] Its home page was hosted on Icculus.org until 2021, when the engine switched to a Git repository hosted on ...