Alain <ele### [at] netscapenet> wrote:
> Bruno Cabasson nous apporta ses lumieres en ce 11/02/2006 09:21:
> > Continuing the RSOCP theme (see thread started at
> > <web.43eafcf196b04c3582fc96790@news.povray.org>), I rendered a radiosity
> > version, with 3 spheres. Appart from wrong settings for the media sampling
> > (and long render time ...), I was puzzled by the reflection of the top
> > sphere on the main one: the spherical pattern of the media appears black!!
> > And I also noticed that if I add a fourth sphere, no reflection occurs for
> > any sphere...
> >
> > Here is the render as it was when I stopped it. If someone has suggestions
> > ....
> >
> > (I can post the source code if necessary).
> >
> >   Bruno.
> >
> >
> > ------------------------------------------------------------------------
> >
> You probably need to increase max_trace_level.
> Make the calculations:
> Enter the first media container, reflection on the sphere, exiting the container = 3
levels
> Add 3 more levels for the second sphere (2 if you only encounter the container) = 6
or 5 levels total.
> Add 1 more for reaching the background.
> So, you need a strict minimum max_trace_level of 7, 10 if you bounce on 2 spheres
and encounter a
> third one.
> Don't fear setting it to high.
>
> --
> Alain
> -------------------------------------------------
> WARNING: The consumption of alcohol may leave you wondering what the hell happened
to your bra and
> panties.

You're right. I increased max_trace_level, and it is ok for the reflection.
I should have found this myself, shame on me ;-) Now, my concern for this
scene is to set proper parameters for the media, in order to have no
artifacts and an aceptable render time.

  Bruno

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