Thanks, now I understand. Didn't know that a transparent layer also 
increased the # of objects reflected passed.

"Gail Shaw" <initialsurname@sentech sa dot com> wrote in message 
news:45bb779a@news.povray.org...
>
> "Johan Feyaerts" <joh### [at] nospamhotmailcom> wrote in message
> news:45bb72b8@news.povray.org...
>> yep that seems to work.
>> I don't really get why the trace level needs to increase when there is a
>> transparent layer around the shiny finish,but anyhow problem  is solved
> now.
>
> Max trace is the amount of objects that the light ray is allowed to
> reflect/pass through before it returns the colour as black. With you 
> putting
> a transparent layer around each ball, you've doubled the number of
> interactions (once for the transparent layer, once for the reflection)
>
> I've got a scene that uses trees with alpha-mapped transparency and water
> and because of those two, I need a max trace of about 90. If I remove the
> trees, it's more like 10. If I remove the water, it's somewhere around 40.
>
>

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