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In article <3a0f9ac9@news.povray.org>, "Mark Wagner"
<mar### [at] gte net> wrote:
> Wrong. IOR is defined as the *ratio* of the speed of light in a
> given material to a reference material (usually, the reference
> material is a hard vacuum).
Ok, thanks for the info...I wasn't certain about there being a lower
limit to ior. I dimly remember reading about the exact meaning of ior,
but not reliably enough to claim only positive values are allowed.
> If an object has a negative IOR, it implies that light entering the
> object will have a negative velocity -- it will enter the object,
> stop, turn around, and head back the other direction!
Which would probably look like a reflection in most cases...possibly a
useful effect.
--
Christopher James Huff
Personal: chr### [at] mac com, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tag povray org, http://tag.povray.org/
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