Dear Tom,

 I tried using the keyword, collect off, as you suggested , and the
photon-map tracing got much faster.

Thank you again,

Jong
"Tom Melly" <tom### [at] tomandlucouk> wrote in message
news:3d3ff2b8$1@news.povray.org...
> "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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