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> Hi there
>
> if I define an ior value of say 1.5 for an object, but also state in finish
> reflection{0.1, 0.8} how does pov ray calculate the reflection? Does it
> calculate the proper Fresnel reflection at the angle of incidence based on the
> ior value, or does it vary it between 0.1 and 0.8 ?
>
> Thanks
> Stu
>
>
If your reflection block state reflection{0.1 0.8}, then, the reflection
follow a linear variation from 0.1, for a perpendicular ray, to 0.8, for
a tangential ray.
In this case, the ior have NO effect at all.
The fresnel model and equation is not used.
To use the fresnel model, you need to explicitely enable it:
reflection{ 0.1 0.8 fresnel }
This enable the use of the fresnel model and demand that the ior been
set within an interior block.
In this case, the fresnel model is used, then, the result is adjusted to
fit within the provided range.
Next, add conserve_energy if you have any transparency at all.
Alain
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