Wasn't it i_sage who wrote:
>No doubt I am doing something silly, but it's not obvious to me...
>
>I am trying to make a complex "glass" object using CSG. But if I make a
>union of two objects made of identical transparent material, I still get
>reflections from the interface - which is not "physics". Worse (for me!) I
>get different results according to whether I put the
>finish/interior/pigment descriptions on each component of the union
>separately, or on the union as a whole.
>
>Can someone please help me? Or just point me to the right bit of the manual?

Use "merge" instead of "union". 

-- 
Mike Williams
Gentleman of Leisure

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