Sorry,

I found this in the beginner's newsgroup (hadn't looked there before):
"I thought it allowed IOR to be less than 1.0, but if not, you can
certainly invert your shape and fill the rest of the universe with a
higher IOR value. Only the difference in the IOR values at the interface
are significant for determining the angle of refraction."

Physically, this is not the same. A positive ior is positive and doesn't
exhibit very strange features even if it is <1.0.

"wolfman" <wol### [at] physikuni-karlsruhede> wrote:
> Hello,
>
> I'm currently working with a group of physicists who fabricate so-called
> "metamaterials". Don't worry, I don't want to bother you with details, but
> the bottom-line is that those materials possess a negative index of
> refraction (ior). Since this is very unusual and the consequences are not
> obvious at once, we would like to make some examples what would happen if
> you sticked e.g. your feet not into water but into this material (you could
> see your feet in front of you...).
>
> My question now is: Is it possible to change POV-ray's source code in order
> to implement negative ior's? Or is it too difficult?
>
> Unfortunately I'm not that familiar with the code, it would take ages for me
> to find it...
>
> Thx in advance...

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