>   The question would better be "could this be avoided with povray?".

[snip]

Easy.  Define two textures for the glass, one with reflection, and one 
with none.

Construct your pane of glass as a CSG difference of two cubes, one taking 
a face off the other.  Assign the textures, one to each cube, and viola!  
You have a pane of glass which has one face which eiother reflects or 
does not reflect, depending on how you assigned the textures.

Bye for now,
     Jamie.

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