"Rohan Bernett" <rox### [at] yahoocom> wrote in message
news:web.3db3743a71f60fbad02c7b870@news.povray.org...
> Could this be used to make lights for the nightside of a planet not
visible
> on the dayside?

That's an idea alright, sure. How to go about that? Using actual light
sources numbering in the hundreds is slow, even if a negative color I think.
But then individual light sources can be diminished to rgb 0 dependant on
placement so negative lights aren't needed anyway.

It's probably more common that nightside lights are faked with image
mapping, hence texturing so it's faster.

A negative light shone onto the daylight side and "lights" image map, which
is layered atop the rest of the planet texture and transparent everywhere
but the lights themselves, coupled together in a light_group would work I
think; with the image map fully ambient so it shows on the dark side of the
planet.
--
Farewell,
Bob

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