> Shot up slightly??? From 7 minutes, 11 seconds to 7h, 36m 48s is
> _slightly_? Or am I mistaken?

Good point. OK: The render time shot up dramatically, when we compare a
300x200 render with 15 intervals to a 720x480 render with 15+40 intervals
(soon to be 15+45 intervals).

> Sorry to say, but I wouldn't call these clouds realistic. (Unfortunately
> I can't put my finger on problem.  shape? or colouring? : greenish-blue,
> from scattering probably, I don't think that it could be seen in
> reality.)

Hmm... I could adjust the color curve in Photoshop after rendering...

> But for artistical pictures, which do not aim for photorealism, these
> clouds could be very useful.

OK, at least I've acheived something.

> Light source seems to be quite close to clouds, as shadows seem to be
> too big for given clouds. Or are there clouds, which are not visible?

The clouds are contained in 2 individual boxes. The first one goes
rom  -<1000000,0,1000000> to <1000000,3000,1000000>, and is 4500 units above
the ground plane. The second one goes from -<1000000,0,1000000> to
<1000000,2000,1000000>, and is 15000 units above the ground plane. The
light_source is at y*10000000, and the camera is at <10000,400,-30000>. I
moved it up that high in order to see if the shadows were showing up,
something which when closer to the plane is hard to confirm. What do you
suggest?

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