"Tim Cook" <z99### [at] bellsouthnet> wrote in message
news:3eb34c78@news.povray.org...
> Will W wrote:
<snip>
> the light source is placed at the exact centre of the wheel, providing
> the same illuminative properties to each wedge.  the red/*/red areas
> are unique in the amount they increase the light that passes through
> them, because they are scattering rgb -0.5 AND absorbing rbg -0.5.
> what sets those three pieces apart from each other is the emission
> value; green is emitting rgb 0.5, white nothing, red emitting rgb -0.5.

Ok, that helps me correct my mental model of what is going on. So what we
are seeing in this are the effects as viewed from outside the plane of the
light rays that cause the effects. Neat!

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