>> To get physically correct results (well, as close as you get with 
>> POV-Ray's "fresnel" feature), it should be:
>>
>>     reflection { 0, 1 fresnel on }

...

> - when specifying "reflection{MIN,MAX fresnel on}", this will reduce the 
> maximum reflectivity to MAX, while at the same time increasing the minimum 
> reflectivity. However, MIN in this case is /not/ to be taken literally as 
> the minimum effective reflectivity; instead, it specifies a kind of "zero 
> reference" for reflectivity calculations; i.e. if the minimum reflectivity 
> according to the Fresnel equations would be FRESNEL_MIN, the resulting 
> effective minimum would be MIN + FRESNEL_MIN*(MAX-MIN).

Thanks for the confirmation, it was something that was not really very clear 
at all in the docs.

Post a reply to this message