Alain Martel <kua### [at] videotronca> 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.
>
> My proposition :
> Start by constructing a single spiral and make it an object with an
> union. Don't give it any pigment nor finish yet.
> Next, place several copies of that object, each rotated  so that it's
> constituent spheres are tangent to those of the previous.

> In that step, give each spiral it's own pigment and finish.
> In the finish, make them reflective with the metallic attribute.

Yes this is what I will attempt next. I looked into the Doyle spirals as was
mentioned above but the math is challenging to say the least.

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