Warp wrote:
> Invisible <voi### [at] devnull> wrote:
>> Mmm, I wonder if POV-Ray can do this?
> 
>   Probably not. AFAIK povray has a very specific refraction formula, which
> it converts to total internal reflection when needed. I'm all but certain
> that this formula does not support the concept of negative IOR.

That was more or less my diagnosis, yes. ;-)

It's not something any typical implementation would support unless the 
designer purposely had this in mind, I would think.

Now negative light sources........ ;-)

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