> > Great job, but shouldn't the clouds have thickness (I don't see any).
>
> I do. They aren't towering stratocumolus, but they obviously have
> thickness. They have leading edges that are brightly lit, and darker
> bodies and edges away from the light. I've seen clouds like this many,
> many times, they are more common then the thunderhead type.
I can't see the tops, (they appear to be flat on the sphere

> > This scene easily shows the problem of sky_sphere, as this sky is a
sphere.
>
> This isn't a sky_sphere. If the author used the technique I used in the
> POV 3.5 demo file, it tries to simulate the actual atmosphere, with
> shells of air and clouds centered far below the origin. It looks like he
> did a lot better at it then I did, though... ;-)
>
>
> > POV's problem is that sky_sphere centers on the origin, but needs to
center
> > far below the camera.
>
> The sky_sphere feature doesn't "center" anywhere. It is not an object,
> it is just a background feature. And it can't do effects like this, just
> pigments.
It appears to center on the camera, wherever the camera is.  This creates
the effect of clouds ramming into the horizon.

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