"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.

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