David Buck <dav### [at] simberoncom> wrote:
> Hey, Craig.  I haven't seen you around in years.
>
> For those who don't know, Craig is the author of Practical Raytracing in C:
>  "https://www.amazon.ca/Practical-Ray-Tracing-Craig-Lindley/dp/0471573019"
>
> (unless I have the wrong Craig Lindley  :-)  )
>
> David Buck
>
>
> On 2022-03-29 2:54 p.m., Craig Lindley wrote:
> > Hello,
> >
> > I came across the attached image the other day that I thought was beautiful so I
> > decided to look at raytracing again. I hadn't done any raytracing since about
> > 1993 so the POVRAY program has changed quite a bit. I am using the 3.8 version
> > of POVRAY and it is amazing. I retraced one of my old images that took 33 hours
> > in the 1990's and today on my Mac it took about 10 minutes.
> >
> > Anyway. I would like to understand how this image was produced because I would
> > like to do something like it for this years Christmas card.
> >
> > It seems to be made up of Fibonacci spirals but I am not sure. I looked at the
> > POVRAY documentation for these types of spirals but I cannot seem to duplicate
> > the image accurately. I would guess that each color is its own Fibonacci spiral
> > but how they are positioned so they don't interfere with each other escapes me.
> >
> > Any help or suggestions would be appreciated. If anyone has access to the actual
> > POV file for this image I would love to have it.
> >
> > Thanks in advance.

Guilty as charged. Yes that is my book but like I said I haven't done any
raytracing in a long time. Thanks everyone for the hints on how to make this
image. Hopefully I'll get my raytracing chops back in trying to figure this
image out.

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