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"Reynald" <rpa### [at] bluewin ch> wrote in message
news:web.42f35e1a3d56aaecf5f6f3660@news.povray.org...
> Hi,
> I'm playing around with light attenuation (fade_distance and fade_power)
in
> a container interior block. I noticed some behaviour that I don't
> understand: the light source has to be positioned inside the fading
> container for attenuation to occur. If the source is outside the container
> then by rendering the effect of the beam on a screen we observe that
> attenuation does not occur. If we activate Photons and add a scattering
> media then we can verify this behaviour along the beam path from the
source
> up to the screen... same result, attenuation only occur when the source is
> inside the container.
>
> I'm probably missing something?... or is it a well known feature of object
> attenuation?
>
> Reynald
>
>
the only thing i know of is this, from 3.3.7.9 of the docs:
"Second, only light coming directly from light sources is attenuated.
Reflected or refracted light is not attenuated by distance."
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