Edward C. wrote in message <3752233d.0@news.povray.org>...
>One technicality you may or may not want to keep in mind is that if you
>shine a laser through relatively dust/smoke free air, it will generally be
>completely invisible except where it actually hits a solid object

However, if you are looking pretty much parallel to the laser beam, most air
has enough dust floating in the air that you see sparkles in the beam.  This
is how photographers manage to take pictures of laser beams.

Mark

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