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.

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