>> I don't think that the Mental Ray shader is doing anything fundamentally 
>> different to POV or Luxrender.
>
> Still, it seems to display some of the best glassware around.  If it 
> requires this much tweaking, I wonder why so many users seem to get it 
> relatively easily in their renders.

I suspect you can just do an "Insert -> Dielectric Shader" and the defaults 
are all pretty accurate for glass.

For example, in POV you need to type reflection{ a,b fresnel on}.  What do a 
and b do in this situation, given that the fresnel equations should exactly 
define the % reflection and % transmission?

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