> 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.

In fact, the only reason the unlit area of the shadow isn't completely black
is probably because of "ambient" light, which has a constant value
everywhere (unless you use radiosity).

 - Slime
 [ http://www.slimeland.com/ ]

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