Warp wrote:
> Urs Holzer <urs### [at] andonyarcom> wrote:
>> I think you must make the glass block hollow.
> 
>   Why would that make a difference?
> 
>   Yet another case of "hollow" being a catch-all generic solution to
>   all
> problems. (Although this is certainly not the weirdest situation where
> it has been (wrongly) suggested as a possible solution, though.)
>   People should *try* before suggesting.
> 

You are right, sorry. One only needs to make it hollow if it contained
any media (and he does not want to see the photons inside the glass
block). The hollow keyword does not affect refraction and photons
passing through (if there is no media).

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