A very minor point; "Variable reflection", in Section 6.7.3.4 of the 
documentation contains the sentence:

"Remember that in real life many opaque objects have a thin layer of
transparent glaze on their surface, and it is the glaze (which
-does- have an IOR) that is reflective."

I read that as suggesting that opaque materials do not have an index of 
refraction. Maybe the segment in brackets could be removed, since I
think the emphasis on the glaze having an IOR gives the impression that
the object beneath the glaze does not. Or is that just me? :-)

Thanks,

Tom York

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