Alex wrote:
> Very nice!

Thanks :-)


> A question, tho...
> These 2 images are made with a 360 deg camera, right?

Right... almost. It is a bit more than 360 to get a bit more space 
between the spheres and the image's borders.

Here is the camera statement :
camera {
   spherical
   location <0,1.5,0>
   look_at  <0,1.5,1>
   angle 360*7.25/7, 180
   rotate (1+.4)*360/7*y
}

> The white band near the horizon is expected?
> I don't have the paper handy to check, so I wonder if it's an artifact of
> the model or an artifact of the particular scene.

I believe it is expected, that it is a feature of the model and not an 
artifact. There are two parameters (x3 color components Yxy = 6 
parameters) for tweaking that (brightening / darkening of the horizon 
and gradient of the color at the horizon). However I still haven't tried 
to modify Preetham's default settings.

The brightening is meant to simulate light scattering in the athmosphere 
whithout using a scattering media which would be much more slower. The 
downside : the sky and athmosphere must be homogenous.


>>Soon, I promise. But right now it is still quickly  mutating.
> 
> 
> When-It's-Ready(tm) is an accepted and *much* appreciated release date.

;-)


Povingly,

Philippe

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