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On Sun, 03 Sep 2000 10:53:12 -0500, Chris Huff wrote:
>In article <39b25901$1@news.povray.org>, "Rune"
><run### [at] iname com> wrote:
>
>> How does it look when located extremely close to a surface? (Is only
>> part of the glow visible, as it should?)
>
>If nothing is between the glow and the camera, the whole thing is
>visible. Proximity to a surface does not and should not affect it, since
>it simulates atmospheric scattering, not a ball of glowing gases.
But some part of the glow comes from backscattering from the gases behind
the horizon of the surface. The glow really should be ever-so-slightly
darker for rays that hit the surface partway into the glow. To prove it to
yourself, render an image that uses scattering media and another that uses
glow and compare.
--
Ron Parker http://www2.fwi.com/~parkerr/traces.html
My opinions. Mine. Not anyone else's.
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