Le 2021-11-22 à 19:52, m@b a écrit :
> On 23/11/2021 3:45 am, Kenneth wrote:
>> "m@b" <sai### [at] googlemailcom> wrote:
>>>
>>> In this animation I cycle the ior of a glass sphere from 1.6 to zero and
>>> back:
>>>
>>> <https://youtu.be/gUzp0Bc6u1I>
>>>
>>
>> Nicely done!
>>
>> Are you sure that your sphere's ior goes to exactly 0.0? I am not 
>> seeing the
>> 'glitch' that I mentioned earlier, where ior 0.0 = ior 1.0. I suspect 
>> that your
>> animation code gets the ior *very close* to zero, but then cycles back.
>>
>>
>>
>>
> Yes - well spotted it goes down to 0.001 :-)
> 
That mean a substance where light travels at 1000 times the speed of light.

An ior of zero would mean light travelling at an infinite speed... In 
both directions at the same time.

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