> I experimented breifly with the scene and found that the thicker BoxB is,
the
> more "spotted" with dark spots it gets, so by the time it gets a deep as
you
> have it, it has so many darker spots that it appears to be black with
white
> spots.
>

Sounds right - I first ran into this using media with a hollow plane, then a
deep box before finally in a "one last try" mood using a thinner box.

> You can increase the intervals and samples of the media, but the cost in
> rendering time is enormous. I don't recommend it, but it does increase the
> white levels of the media.
>

Thanks for the suggestion, I'll try it out.

However, I suspect that this might just result in a less spots, more black -
I only say this as this is what I get in the MegaPOV which seems less prone
to "spotiness" in medias.
--
Tom Melly
tom### [at] tomandluforce9couk
http://www.tomandlu.force9.co.uk

Josh English <eng### [at] spiritonecom> wrote in message
news:38CFDD95.5A7EBD44@spiritone.com...
> I experimented breifly with the scene and found that the thicker BoxB is,
the
> more "spotted" with dark spots it gets, so by the time it gets a deep as
you
> have it, it has so many darker spots that it appears to be black with
white
> spots.
>
> You can increase the intervals and samples of the media, but the cost in
> rendering time is enormous. I don't recommend it, but it does increase the
> white levels of the media.
>
> Josh
>
> Tom Melly wrote:
>
> > With the camera and light above the following boxes, BoxA shows up as
white
> > media, which is what I expected, but BoxB shows up as black - why is
this?
> > After all, if you are looking down at a cloud from an airplane, beyond a
> > certain point the actual physical thickness of the cloud is not
> > particularily significant (is it?).
> >
> > #declare BoxA =  // nice 'n' white
> > box
> > {
> >   <-10000, -1, -10000>
> >   < 10000,  0,  10000>
> >   pigment{rgbf<1,1,1,1>}
> >   hollow on
> >   interior{media{Plain_White_Scattering_Media}}
> > }
> >
> > #declare BoxB = // completely black
> > box
> > {
> >   <-10000, -10000, -10000>
> >   < 10000,  0,  10000>
> >   pigment{rgbf<1,1,1,1>}
> >   hollow on
> >   interior{media{Plain_White_Scattering_Media}}
> > }
>
> --
> Josh English
> eng### [at] spiritonecom
> "May your hopes, dreams, and plans not be destroyed by a few zeros."
>
>

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