"Jong" <jjk### [at] mmewhaackr> wrote in message news:3d3fda7a$1@news.povray.org...
>
> May I regard the "don't show up on" as "don't show up on the surface of" the
> glass object?

Yes.

On the whole, objects either show photons (they collect photons that have passed
through, and been influenced by, a target) or affect photons (they are a target
for the photons emitted by a light).

The reason for this is fairly obvious - objects that affect photons must either
be transparent or reflective, therefore any photons falling on to them will
either pass through or be reflected by them.

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