So no value in using scattering media to help "scatter" the sunlight around
the room...?

JP

"JRG" <jrg### [at] hotmailcom> wrote in message
news:3d41b4f1@news.povray.org...
> "John Pallett" wrote:
> > Hi guys -
> >
> > Some more notes -
> >
> > I was surrounding my entire scene with a gigantic white sphere, not
creating
> > a 'spherical sun'.  The problem, as it turns out, was that the light
wasn't
> > getting scattered around the room enough for it to properly simulate
> > sunlight coming in a window (which scatters all over the room).  So the
> > scene consisted of:
> >
> > - A huge white sphere, ambient 0.5
> > - A parallel white light (sunlight) (parallel lighting for the sun is
good
> > enough for our purposes)
> > - A room with a window, all materials set to (ambient 0, diffuse 0.9) so
> > that they aren't emitting light into the scene
> > - My camera inside the room
> >
> > Thanks to everyone for suggestions thus far.  The missing ingredient
seems
> > to have been media, which can be used to scatter light.  What I am doing
now
> > is using media inside my rooms to scatter the sunlight as it comes in
the
> > window and as it bounces around the room.  Very subtle scattering gives
me
> > great results.
> >
> > I'll post images to PBI once I get something put together that
demonstrates
> > the problem clearly.
> >
> > Can anyone suggest another way to solve the problem of having the light
> > coming in the window scatter around the room appropriately?  Note that
my
> > camera points TOWARDS the window, so making the window's wall invisible
is
> > not an option.
>
> Ah. Too bad. Then you have to:
> 1) Raise the count to appropriate value.
> 2) Raise the recursion limit to appropriate value (3).
> 3) Raise the brightness to appropriate value (2.5, 3 or even more)
> 4) Be very patient.
>
> Otherwise you could put a huge area_light right where the window is. This,
with just
> a bit of tweaking, should give you very soft shadows which, together with
just a bit
> of radiosity, might look nice nonetheless. This can be very slow too.
>
> Anyway ambient 0.5 is pretty low for a skysphere. Use a real sky_sphere
with a
> gradient from white (bright white: rgb 1.25) to sky blue.
>
> --
> Jonathan.
>
>
>
>

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