> I don't know, but in all these cases different from the /simple/
> reflective surfaces, we need some good working examples demonstrating
> the properties. I confess that this is too difficult for me - and
> probably most people - to do and expect them from our own gurus :-) I
> have also difficulties visualising an averaged texture or a layered
> texture staying within the properties boundaries.

What really would be ideal would be some macros to use for various 
groups of materials (glasses, metals, plastics, paints etc) with 
parameters designed such that no matter what values you give you are 
guaranteed a physically correct material.

I'm not a regular user of POV anymore so it's all too easy for me to get 
one number "wrong" and then I don't get a physically correct material. 
If there were some macros-for-dummies then this whole problem would be 
avoided and would surely lead to much higher quality work from all 
non-experts.

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