tomcool wrote:

> well the pane is basic, only boxes

Not sure if this is related to your problem but try
to avoid the coincident surfaces (the outer sides of
your glass are exactly on the inner sides of the frame,
try making the glass a bit smaller).

Also, what is the interior block applied to the Carreau
later? I assume you have one as you use fresnel reflection.
Note that min/max reflection, ior, and viewing angle then
determine how strong the reflection is.

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