Think the proper term might be  /inversed clipped_by/  seeing as how
there are no structures left within the bounds of the master object.
That is to say, no surfaces exist unlike using a form of
'intersection' or 'difference' (the only pair of things everything
else seems to be based on when "cutting").
Just happened to think, if a unioned CSG is completely opaque is there
no ray testing done within said CSG?  Sure this has been asked a
thousand times before so maybe it's in the VFAQ, I'll go look  : )

Bob

Ian Burgmyer <the### [at] hotmailcom> wrote in message
news:37e40019@news.povray.org...
> > I will leave it as
> > an experiment to the user to find out why it works. Test in 1
week...
>
> I think I know.  Is it because the geometry of the objects in the
merge CSG
> block are not traced?
>
> I did a little checking and experimenting with the image.  Then, I
did a tad
> bit of research in the manual to confirm my findings.
>
> -Ian
>
>

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