On 22/11/2021 5:11 am, Kenneth wrote:
> Alain Martel <kua### [at] videotronca> wrote:
>>
>> I've experienced with negative ior. That makes the surface behave as if
>> it had
>> finish{ reflection 1 }
>>
> 
> That's an interesting observation. With my own tests here, I was not sure a
> 'negative' ior was having any effect when lower than 0.5-- until I re-positioned
> the crystal and camera 'just so'. Then I could see at least my sphere inclusion
> subtly changing its appearance as the ior decreased. But as a practical matter,
> the more negative it goes, the less of a visual change there is.
> 


In this animation I cycle the ior of a glass sphere from 1.6 to zero and 
back:

<https://youtu.be/gUzp0Bc6u1I>

Probably not relevant :-)

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