Dear Tom,

I really appreciate your kind reply.

"Tom Melly" <tom### [at] tomandlucouk> wrote in message
news:3d3fb7bd@news.povray.org...
> In general, glass objects will be photon-targets, in that they will affect
> photons, but will have "collect off" so that photons don't show up (or try
to
> show up) on them. This is because
> a) glass doesn't really show photons
> b) you can get some odd photon artifacts on glass.

May I regard the "don't show up on" as "don't show up on the surface of" the
glass object? (Since I'm not very good at English, the meaning of some word
is sometimes not very clear to me.)

Thanks,

Jong

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