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.)

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