Dolan wrote:
> 
> I'm wondering -- which value of fade_power is physically accurate?

None are.

Real light attenuation is proportional to 
  1/(d^2)

The closest you can get with POV is fade_power 2 (and 
fade_distance 1), which is proportional to

1/( (1+d/(fade_distance))^fade_power )

or

1/( (1+d)^2 )

As d gets larger, this approximation looks more and more like the
real thing.

-Nathan

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