> Am 01.04.2012 16:17, schrieb Crippso:
>
>> Thanks for the reply - but i notice you say that when the photons are
>> perpendicular to the surface the fresnel reflection will be precisely
>> 0. Is this
>> really true in povray? In the real world the fresnel reflection would
>> be 2 times
>> ((1.5-1)/(1.5+1))^2 = 0.08.
>
> That's also what POV-Ray will compute - provided you set adc_bailout low
> enough. (I'm a bit puzzled though why adc_bailout needs to be as low as
> 0.0015 for this to work; I'd have expected anything below 0.08 to be ok.)

adc_bailout default to 1/256 or 0.003906.
So, you need to set it at less than half it's default to have a correct 
computation...
Strange indeed. There may be a subtil bug hiden here.


Alain

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