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The are located in a linear light’s (see Use the control window).
Controls how quickly light intensity decreases with distance. The setting has no effect at distances less than 1 unit.
The parameter works differently for volume lights (see Decay). Valid settings are 0, 1, 2 or 3. The default setting is 1.
|no decay; light reaches everything|
|light intensity decreases directly (linearly) with distance (slower than real world light)|
|light intensity decreases proportionally with the square of distance (the same as real world light)|
|light intensity decreases proportionally with the cube of distance (faster than real world light)|