> Hi,
> I would like to look_at to an object by TWO parallel glass porthole.
> No problem if camera looks directly (straight line), but if in the optical path

> BLACK !!!
> A solution ?
>
> Christophe
>
>

As you use a mirror, you need to increase your max_trace_level by 1 or 
more. If you have 2 mirrors, you must increase by at least 2.

Make sure that your mirror(s) is effectively a mirror: finish{reflection 
1 ambient 0 diffuse 0}

Make sure that the second glass porthole is realy transparent.



Alain

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