"Ken" <tyl### [at] pacbellnet> wrote in message
news:3B2### [at] pacbellnet...
>
> You need to make the glass refractive by adding an ior value inside an
> interior statement. The ior for glass is around 1.33.
>
Er, actually 1.33 is a great IOR for water. Most glasses are closer to 1.5.
- How
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