> > Hmm...  To really slow things down, would there be any way to use the 
> > trick to simulate variable internal IOR, however crudely?
> > 
> > It would probably require an obscenely high max_trace_level though.
> 
> You can, and it does. It can get very slow.

I thought it might :)

> > And i can't remember if you can apply a pattern to the surface iro or 
> > not, as I't sbeen a while since I played with POV.

translation:

And I can't remember if you can apply a pattern to the surface ior or 
not, as it's been a while since I played with POV.
 
> You can't any more, that was removed in 3.1 because it didn't really 
> make any sense. Earlier versions had ior in the finish block, so you 
> could use a texture_map, 3.1 and 3.5 have it in the interior block.

Oh, I knew it was in the interior block, I just couldn't remember if 
there was any way to vary the ior over the surface of an object.

> However, you could apply a normal to the refracting layers if all you 
> want is to introduce some irregularities.

As well as increasing the render time further still, and requiring even 
higher max_trace etc. etc.

Yeesh.  Please ignore the typo's, my brain has gone on holiday for the 
evening :)

Jamie.

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