Ok, you are right. It was probably just coincidence, that in my first test,
the Iso vanished in the first render, rendered properly after removing those
three lines and vanished again in the third render, when I added those three
lines again. To be honest, I can't reproduce this behaviour again.

As to the magic black boxes: I might not be familiar with the pov-code or
even the programming language it's written in, but I had my slice of
assembler programming back in those 6502-days. I really know that there is
no magic in those boxes - but I also know that mistakes are possible. All we
beta-testers can do, is to describe the behaviour of the program you
programmers give us to play/work with. We/I might not look intensiv enough
in a problem when we report it, but we/I clearly don't want to lead you to
false tracks or distract you or somethink like that.

Best regards,

Marc-Hendrik

Thorsten Froehlich schrieb in Nachricht <3bb9ebb2@news.povray.org>...
>In article <3bb9851e@news.povray.org> , "Marc-Hendrik Bremer"
><Mar### [at] t-onlinede> wrote:
>
>> What is really strange, is that removing those three blank lines in the
>> example code you provided changed the output! Thorsten might not want to
>> hear this (:-)), but there is a definitive relation between these to
thing!
>
>No, blank lines do not cause this.  Computers are no magic black boxes and
>these lines can under no condition *anything* to do with the problem.  Lets
>not spread false rumors about the inner working of computers or POV-Ray,
>please.  I am sure everybody in the POV-Team will say the same (but I have
>not asked).
>
>It is most likely that repeated renders (because of different random
>numbers) exhibit the effect in different places or not at all.
>
>
>    Thorsten

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