"Cousin Ricky" <ric### [at] yahoocom> wrote:
> "Stephen" <mcavoys_AT_aolDOT.com> wrote:
> > Because there is no atmosphere in space the shadows should be deep and
> > sharp (The ambient for your textures should be 0 or very close).
>
> Atmospheric scattering isn't the only factor.  The Earth casts formidable
> backlighting.  In low Earth orbit, the Earth occupies nearly all of one
> side of the universe.  At the Earth-Moon distance, the Earth reflects
> almost 60 times more light than the Moon.
>
> The sharpness of the shadows depends on the size of the light source.  The
> Sun spans about 1/2 degree in diameter, enough for subtly, but noticeably
> fuzzy shadow edges.  An extreme case is the penumbral area of a lunar
> eclipse.

I stand (or sit) corrected. That would call for a very large area light.

Stephen

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