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Intensity
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This drives the overall intensity of the sky. It is a direct multiplier of the sky radiance function.
Intensity 1.0 | Intensity 1.5 | Intensity 2.0 |
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Turbidity
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This parameter determines the overall aerosol content of the air. As an example, a moist day will have higher turbidity values than a dry day. Values range between 1 and 10.
Turbidity 1.0 | Turbidity 4.0 | Turbidity 10.0 |
Also note that turbidity affects the look of the sun when near the horizon. The following renders show the effect of turbidity for different sun elevations.
Elevation = 0.75 | |||
Elevation = 0.50 | |||
Elevation = 0.25 | |||
Turbidity 6.0 | Turbidity 7.0 | Turbidity 8.0 |
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Ground Color
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Changing ground color (also called albedo) affects the brightness of the whole sky-dome, especially in high turbidity settings. High albedo values can occur in winter scenes - snow reflectance is very bright so almost all incident radiation is reflected and backscattered towards the viewer.
Ground Color is white | Ground Color is green | Ground Color is blue |
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Elevation
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This the elevation of the sun, in degrees. The range is 0 to 90.
Elevation 5 | Elevation 20 | Elevation 40 |
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Azimuth
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This is the azimutal position of the sun, in degrees. Range is 0 to 360.
Azimuth 90 | Azimuth 180 | Azimuth 270 |
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Sky Tint
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A convenient artistic control to change the overall color of the sky dome. If physically correct renders are desired this parameter should be set to (1,1,1).
Sky Tint is white | Sky Tint is red |
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Sun Tint
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A convenient artistic control of the sun's color. If physically correct renders are desired this parameter should be set to (1,1,1).
Sun Tint is white | Sun Tint is red |
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Sun Size
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The size of the sun in the sky, in degrees. The default value (0.51 degrees) is the size of the sun as seen on earth. Note that changing the size of the sun doesn't affect the overall radiance of the sky in this model but the objects will receive more light, as seen in the images below.
Sun Size 0.51 (default) | Sun Size 1.51 | Sun Size 3.51 |
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Draw Sun Disk
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This enables or disable the sun in the sky. Disabling the sun will disable the drawing of the sharp component of the shadows (the strongly directional shadow).
Draw Sun Disk is on | Draw Sun Disk is off |
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Draw Ground
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Draws the ground (the space under the horizon) using the color specified in Ground Color.
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Quick Start and Example Scene
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Quick Start and Example Scene
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Create an environment light by clicking on the checker boarding facing Environment Light
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An example Maya scene can be found here: sky-example.ma