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A scene by Pawel Filip lit by the physical atmosphere simulator.
A scene by Pawel Filip lit by the physical atmosphere simulator.

 

Main properties

Main properties of the physical sky lighting.
Main properties of the physical sky lighting.


The Physical sky rollout allows you to enable the physical atmosphere lighting simulation to illuminate the scene.

NameFunctionExtra
EnableTurn the physical sky simulation ONThis can be used without the Sun option and will render the sky only
LatitudeLets you define a precise location on earth by providing latitude coordinatesSome websites or map applications provides the coordinates with inverted plus and minus signs, if your settings does not match the real location, try to flip the value's sign
LongitudeLets you define a precise location on earth by providing longitude coordinatesSome websites or map applications provides the coordinates with inverted plus and minus signs, if your settings does not match the real location, try to flip the value's sign
HeadingLets you change the north direction, to match a wrongly oriented sceneThe valid range is -180° to 180°

 

The earth rollout allows you to edit accurately the position of the scene on earth. This is particularly useful when the scene is not oriented correctly and must be lit by daylight exactly as it will be in the real world.

NameFunctionExtra
Lat/Long  

Physical sun

Physical sun settings.
Physical sun settings.


This rollout gives you the ability to use a physical sun emitter to light the scene.

NameFunctionExtra
EnableActivates the Sun lighting simulation-
YearLets you define a specific year at which the sun astral position must be simulatedThe valid range is 1971 to 2050
MonthLets you define a specific month of the year at which the sun astral position must be simulatedThe valid range is 1 to 12, matching one of the year's month
DayLets you define a specific day of the month at which the sun astral position must be simulatedThe valid range is 1 to 31, matching one of the month's day
GMTLets you pick a specific time zone on earth to compensate for local daylight saving timesThe default is the Greenwhich parallel with no time shift
HourLets you pick a specific hour of the day at which the sun astral position must be simulatedThe valid range is 0 to 23. Note that the physical atmosphere does not simulate night sky. At night times, the render will be pitch black
MinuteLets you pick a specific minute of the hour at which the sun astral position must be simulatedThe valid range is 0 to 59

Sun overrides

Sun overrides settings.
Sun overrides settings.

 

This rollout gives access to some physical sun overrides to control the sun ball power, color, position or diameter in order to accommodate to different situations, even unrealistic ones.

NameFunctionExtra
Use power  
PowerLets you override the physically-correct sunlight power to raise or lower itThe unit is a percent of the physically-correct sun power
Use KelvinEnables the sun color customization.This works in kelvin temperature, the valid range is 2500-10000. Default is 5777.
TemperatureLets you override the physically-correct sunlight color temperature to use a custom oneUse carefully to avoid un-realistic results, unless it's the desired effect
Use positionLets you override the sun object position by using user-friendly azimuth and altitude anglesThe first setting is the azimuth (the sun's direction), while the second is the altitude (the sun's elevation above the horizon)
AzimutControls the sun's azimut (its position around the scene).The valid range is -360°/+360°
AltitudeControls the sun's altitudeThe valid range is 0°/90°
DiameterLets you override the physically-correct sun diameter by using a custom settingUsed with care, it will immensely help the convergence of difficult sun caustics, particularly with the Metropolis sampler. Be aware the too large values will produce very soft sun shadows and un-realistic results. Although, combined with a lower sun power override, it can be used to mimic a fuzzy sky daylight. The valid range is 0.1 to 45°

 

The sun diameter override
Various sun diameter settings and their effect on the render.

Physical atmosphere

Physical atmosphere settings.
Physical atmosphere settings.


This simulate the various kind of impurities that may be floating in the atmosphere and affect the overall sun and sky shades and intensity.

NameFunctionExtra
TurbidityThis simulates the haziness of the physical atomosphereHigh values will produce a stronger atmosphere scattering, making the sun look dimmer and the sky brighter, with a yellow-ish tint
AerosolThis simulates the amount of green-house gases present in the atomsphereHigh values will produce a more orange/pink sun light color by simulating the scattering of the sun light through gases
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