> aside from a simple "global_settings {ambient_light 1 }", there is no
other
> light in the image.

Actually, that is just the default setting, IIRC. It's use is for the
ambient-settings in the finishes of the object's texturing. Objects that
aren't directly lit by any actual lightsource would just appear black, and
many a beginner's images would end up being pits of darkness with few
lighted spots. To simulate a very crude ambient lighting, ambient thus
lights up all surfaces, disregarding the actual amount of light or shadow
they get. I hope my phrasing wasn't too complicated, but you can always look
for "ambient" in the documentation.

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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