The 3Delight Sky is a utility node that can be used for image based lighting of day light conditions.
The Model
This shader is based on the Hosek-Wilkie sky model. It is an analytical model of the daytime sky that includes the latest improvement in this field of research. This model is able to properly sunsets and lighting in high turbidity environments - such as very moist environments.
The Parameters
| Parameters | Description | |||
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Intensity | This drives the overall intensity of the sky. It is a direct multiplier of the sky radiance function.
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Turbidity | 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.
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Ground Color | Changing ground color 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.
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Elevation | This the elevation of the sun.
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Azimuth | This is the azimuth of the sun.
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Sky Tint | ||||
Sun Tint | ||||
Sun Size | The size of the sun in the sky, in degrees. The default value is the size of the sun as seen on earth. | |||
Draw Sun Disk | 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 Ground |