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I think you may be confusing a Fresnel lens with a diffraction grating.
Fresnel is simply a compression of the relevant portions of a standard lens.
...or maybe I am wrong. But I have used the Fresnel measurements to make a
solar reflector that worked just like the parabolic dish reflector I modeled
it on.
gregg <gp### [at] nmt edu> wrote in message news:37c5fb73@news.povray.org...
> Philip;
> Your attempt to model the physical behavior of a fresnel lens using
POV-Ray
> is probably doomed to failure, even with the "photon patch", because a
> fresnel lens, unlike an ordinary glass lens, does not "bend" light by
virtue
> of slowing down light differentially along the radial axis, but by wave
> interference and the mutual interaction of an infinite number of spherical
> wavelets eminating from the disturbance, in this case, concentric circular
> grooves on a transparent substrate. Since the photon patch probably relies
> on a simple particle model and not a wave model of light, it is doubtful
> that you will be able to reproduce this effect. To realistically model
light
> in all its glory, one must incorporate both particle and wave behavior.
The
> dominant property observed depends on the particular phenomenon being
> studied. Specular reflection could be considered "most particle like", and
> Young's two-slit experiment "most wave like".
>
> People in the oil business, also perform "ray tracing" but their software
> does in fact treat the energy, in this case a mechanical disturbance, as
> waves, with frequency, amplitude, phase, mode, and polarization. Also,
> seismic simulations are notorious for being computationally intensive.
>
> Gregg
> ------------------
>
>
>
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