Thanks for the comments fellas.

Bruno:
>     . Jupiter radiates light (self albedo) and the surface in the shadow
> should be more visible.
I didn't know that, but it makes sense. A small ambient value should take
care of that.

>     . I would remove Jupiter's atmosphere (perhaps that would be a mistake
> ....) and increase a bit the contrast of the surface.
I tried Jupiter without the atmosphere but it didn't look right next to
Io's. I think both bodies should be the same; either with or without
atmosphere. I agree about the contrast on Jupiter's surface, too. Easily
corrected...

Thomas:
> One thing missing (but don't do it now!): a volcanic plume on Io limb.....
Er, yes. Good idea, but a project in itself!

Yadgar:
> I don't think that Io has any atmosphere dense enough to be visible from
> outer space! On http://www.solarviews.org/eng/iomountain.htm I found this:
Yes, too true. I didn't think Io had any sort of atmosphere, and Jupiter's
certainly doesn't look like that. I wanted them to look slightly
'Hollywood-y', like film effects. I might try them both without atmosphere
for comparison...

Bill

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