Using Sunlight - Adobe ATMOSPHERE User Manual

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CHAPTER 13
The scene with a Brightness value of 1.
The same scene with its Scene Brightness set to 5. Darker regions are brightened but lighter regions may lose contrast.

Using Sunlight

In addition to emissive surfaces, you can also specify a distant light source known in Atmosphere (and in the real
world) as the Sun. The Sun's settings are found in the Sun tab of the Lighting Control palette and include: Elevation
and Azimuth settings to describe its position in the sky, Cone Angle and Brightness to describe its intensity and Red,
Green and Blue to describe its color.