> I once tried to render a similar scene on Luxrender, also unbiased.  It 
> too wasn't quite able to reproduce that same delicious Mental Ray 
> dielectric shader effect.  Does that mean the Mental Ray dielectric 
> shader, while beautiful, does not correspond to reality?

I think it's just a matter of tweaking the colours, filter/transmit 
parameters, reflection values, etc.  But the problem is with unbiased 
renderers it can take an age to go through this trial/error process if you 
are trying to copy some effect.

I don't think that the Mental Ray shader is doing anything fundamentally 
different to POV or Luxrender.

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