Fog Lights
Fog lights simulate scattering of the light by fog. You can specify
fog lights in:
In the PropertyManagers, specify:

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Density = 5 |
Density = 25 |
Fog Quality
(available only with Shadows on
enabled). When set to Low, objects
blocking the light are ignored and do not cast shadows, resulting in fast
performance. For any other setting, volumetric shadows are calculated
by taking objects blocking the light into account, increasing rendering
time because the calculations use numerical integration.

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Low quality - no fog shadows |
High quality - volumetric shadow |