"Slime" <fak### [at] emailaddress> wrote...
> > I do like a wee dram but I noticed that when I turned on photons the
> > whisky colour of the shadow went.
>
> This is physically correct. Any light passing through the glass becomes a
> photon. Notice that the photon-covered areas *are* colored, since that
light
> is filtered by the color of the drink. The rest of the shadow is uncolored
> because none of the light hitting that area has passed through the glass.

Correct.  It is interesting how our perception of our world often differs
from reality.  When I started working on the photon code, I started looking
more closely at real items in the real world, and I noticed that many
shadows of clear objects (such as a glass of water) looked very different
than how I thought they "should" look.  The reality is that much of the
shadow area is almost completely black.  However, when we casually view
something like a glass of water, if we don't look carefully, our brains have
a tendency to fill in details that really aren't there.

-Nathan

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