[POV-Ray 2.2 What is Ray-Tracing?] explains it fairly simple.

/Stefan


"Kman" <mzu### [at] yahoocom> wrote in message
news:3f9440d5$1@news.povray.org...
> Okay, so playing around with this lense idea gets some really cool
lighting
> effects, but none of these is having any effect at all on the shadows. I
can
> only assume that shadows are created/calculated in a different process by
> POV-Ray. Does this mean that its not a true ray-trace process according to
> the strictest definition of the term? I'm just learning all this stuff,
but
> I thought I understood ray-tracing to be a process by which every pixel or
> sub-pixel on the "screen" (or picture-frame, for lack of a better
> descriptive) was "traced" back to its light source, picking up color
> properties along the way based on the properties of the objects and lights
> in the scene. Too simplistic a description, I'm guessing. Could someone
> 'splain?
>
> -Kman
>
>
> "Kman" <mzu### [at] yahoocom> wrote in message
> news:3f94171f$1@news.povray.org...
> > Okay, I turned on and input a setting of 0.5 for my "caustics" setting
of
> > the lense material and it caused the light to be bent. Its not having
the
> > hoped-for effect on my shadows, but it is having some interesting
lighting
> > effects on the model. (See the before and after pics in m.bin) FYI...
> >
> > -Kman
> >
> <snip>
>
>

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