ABX <abx### [at] abxartpl> wrote:

>   g = sqrt(Sqr(ior) + Sqr(cos_angle) - 1);

That is cos(beta).

So if ior^2+cos_angle^2-1 < 0 total interreflection should occur.
But just setting F=1 would perhaps be the wrong solution (though it 
would still be much better than the current situation), since
that would still be clipped to [reflectionmin, reflectionmax].
There are some other references to total interreflection in that file so 
maybe this case is _supposed_ to be caught earlier?

Lutz-Peter

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