kurtz le pirate <kur### [at] gmailcom> wrote:
>
> On this page
> <https://medium.com/@gklka/every-default-wallpaper-of-os-x-7d6fee2e63e3#.mdysmxa3u>
> you can see some background images from 10.0 to 10.4;
>
> Do you think it is possible to make this kind of image with POV-Ray ?
> If yes, how ? Can be with fractals?

Thought of torus shapes looking at those, so went with that. You could try
plenty more by changing/adding other objects, and of course changing parameters
and everything. In other words, maybe not need fractals.
However, this does have me wondering if there's other possible ways to go about
it anyway. Some of those look like curving sheets and I was thinking that might
need color specular highlights instead of media alone.
And I didn't succeed in getting emitting media to fill the torus the exact way I
wanted. That's when I found a povray group message about toroidal warp (for
edge-on galaxy, couple years ago*), but that again failed for me. Couldn't get
tight lines filling the torus, close but never enough.

/* smoky cobweb wallpaper */

#version 3.7;

global_settings{assumed_gamma 1}

camera
{
 location <0,3,-12> look_at 0
 up y
 right image_width/image_height*x
 angle 67
}

#declare Speed=yes;  // no for slow final render

#declare Color=<0.2,0.4,0.8>;

#declare Lightness=0.5; // >0 to ?

#declare ScaleFactor=1; // >0 to ?

#declare RotateFactor=1; // >0 to 1

#declare TranslateFactor=3; // >0 to ?


box{-33,33 pigment {rgbt 1} inverse} // finite enclosure

background {rgb Color*Lightness}

#include "functions.inc"

#declare xS=seed(35);
#declare yS=seed(41);
#declare zS=seed(92);

#for(It,0,7,1)
#declare Xr=rand(xS);
#declare Yr=rand(yS);
#declare Zr=rand(zS);

torus
{
 2+Yr*5, 0.1+3.9*Zr
 hollow on
 pigment
 {
  rgbt 1
 }
 interior
 {
  media
  {
   samples
#if(Speed>0) 20 #else 60 #end // increase if needed
   emission (Color/4)*Lightness
   //absorption 0.5
   density
   {
   function { f_torus(0,y,0, 2+Yr*5, 0.5+3.5*Zr) }
    density_map
    {
     [0 rgb 1] [0.1 rgb 0] [1 rgb 0]
    }
    warp { // same major radius... or what?
    toroidal orientation y major_radius 2+Yr*5
    }
   }
  }
 }
 scale 0.5+Xr*ScaleFactor // could try this after translate
 rotate <Xr,Yr,Zr>*360*RotateFactor
 translate <Xr,Yr,Zr>-<Xr,Yr,Zr>*TranslateFactor
}

#end
/*-------------end scene------------*/


* link to that message for the curious:

http://news.povray.org/povray.binaries.images/thread/%3C54855e67%40news.povray.org%3E/

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