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16.90.5.4 - atmosphere (SceneScript element)

 <atmosphere EXP

This language element may be used inside a  <trait block.

IOR (EXP) can reasonably vary from about 1.0 on upwards. IOR stands for "Index Of Refraction" and represents a controlling element for how much a light ray will bend when it transits the interface between the atmosphere and objects that have a differing IOR. This setting is related to the  <refraction language element, which lets you define an IOR for objects that exist in the atmosphere. The atmosphere, as we mean it here, is the otherwise empty space that you're creating objects in. Here are some reference IOR values for your use:

MediumIOR
Vacuum1.0
Air1.0003
Ice1.309
Water1.333
Alcohol (Ethyl)1.36
Fluorite1.434
Glass1.46 to 1.66
Turpentine1.472
Glycerine1.473
Rock Salt1.544
Quartz1.544
Ruby1.72
Zircon1.923
Diamond2.417
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