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"muyu" <lsy### [at] gmail com> wrote:
> Hi,
>
> In Povray, the optical properties of each surface can be set by ambient, diffuse
> and specular.
And phong. And also 'emission' now. And in other ways too.
> This is very flexible but only single value is allowed over
> color-channels.
Emission, ambient and diffuse can all use 'color' vectors, rather than just a
single (white/gray) value.
> As a matter of fact, the optical properties of object often
> differs over wavelength or colors. I am wondering what's the assumption in
> Povary to deal with this.
For reflections, there is the 'fresnel' keyword. Also 'irid' (iridescence).
POV-Ray doesn't actually use light wavelengths for computation; it works in a
different way.
> It will be great if you could recommend a reference to
> describe the raytracing theory used in Povray. Thanks a lot in advance.
The POV-Ray documentation itself has a section on the theory of raytracing...
2.3.11 SDL tutorial: A raytracer
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