TinCanMan wrote:
>> systems.  But the documentation is somewhat sketchy.  For my particular
>> application I wish to model surfaces which are 'anti-reflection' coated
>for
>> rays nearly normal to the surface but the reflectivity increases rapidly
>> away from some limits.  Typically the reflectivity may be 0.25% for normal
>> incidence but rises to 1% at 20deg and  50%at 70deg.  So it's a challenge
>> to find the variables of Reflmin,Reflmax and falloff  which give the best
>> fit.
>
>You may want to make use of the 'slope' pattern used in conjunction with
>multiple textures with varying reflectivities.  It might give you more
>control.
>
>On the other hand, if you are just having difficulty visualizing the
>variables, I like to set up the equation with a graph in excel so I can play
>with the variables and see the effect.
>
>-tgq
> Thanks for that..but I could not locate the equation in the documentation - hence my
need for the artificial setup.  I'm not too familiar with the more subtle features of
POVRAY - so I'd welcome an example of the 'slope' pattern method you suggest - what
about texturing a lens with the coating I described?

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