Esta imagen fue creada con POV-Ray.

Yo, el titular de los derechos de autor de esta obra, lo libero al dominio público. Esto aplica en todo el mundo. En algunos países esto puede no ser legalmente factible; si ello ocurriese: Concedo a cualquier persona el derecho de usar este trabajo para cualquier propósito, sin ningún tipo de condición al menos que éstas sean requeridas por la ley.

This image was created using POV-Ray for Windows, version 3.6. The image was rendered to an 1800 x 1800 square, using 0.3 anti-aliasing, and then cropped and compressed using pngcrush.

#include "colors.inc"

background { color White }

global_settings { assumed_gamma 1.0}

camera
  {
  location <0, 0, -25>
  right <1,0,0> up <0,1,0>
  look_at  <0, 0, 0>
  angle 5
  }

light_source
  {
  <0, 20, -50>
  color White
  area_light <5, 0, 0>, <0, 5, 0>, 10, 10  /* very slow, decrease 10 to 2 for experiments */
  adaptive 3
  }


#declare r_tube = 0.07;  // thickness (radius) of tube

sphere_sweep
  {
  cubic_spline 85,
  <-0.532393,-0.303254,-0.168334>, r_tube
  <-0.435711,-0.371145,-0.197371>, r_tube
  <-0.323661,-0.420206,-0.194544>, r_tube
  <-0.209225,-0.446429,-0.154445>, r_tube
  <-0.105929,-0.452874,-0.0783701>, r_tube
  <-0.0162369,-0.453536,0.0216059>, r_tube
  <0.0738052,-0.458697,0.120934>, r_tube
  <0.178619,-0.459566,0.194881>, r_tube
  <0.296064,-0.442396,0.231129>, r_tube
  <0.412134,-0.403243,0.228587>, r_tube
  <0.513303,-0.34513,0.19326>, r_tube
  <0.59157,-0.272998,0.134434>, r_tube
  <0.643963,-0.191009,0.0616794>, r_tube
  <0.670329,-0.101849,-0.0164444>, r_tube
  <0.671431,-0.00706073,-0.0924153>, r_tube
  <0.647984,0.0919557,-0.159049>, r_tube
  <0.600829,0.192749,-0.20881>, r_tube
  <0.532212,0.290883,-0.233814>, r_tube
  <0.447565,0.37994,-0.227005>, r_tube
  <0.35668,0.453602,-0.184662>, r_tube
  <0.271981,0.510756,-0.109417>, r_tube
  <0.201729,0.560789,-0.0125538>, r_tube
  <0.141295,0.618876,0.0868387>, r_tube
  <0.0752576,0.691514,0.168295>, r_tube
  <-0.00848156,0.77061,0.217123>, r_tube
  <-0.110131,0.840668,0.226849>, r_tube
  <-0.220793,0.887057,0.198629>, r_tube
  <-0.327915,0.9,0.139557>, r_tube
  <-0.418917,0.875489,0.0606938>, r_tube
  <-0.483319,0.814976,-0.0246536>, r_tube
  <-0.514081,0.724844,-0.102336>, r_tube
  <-0.508764,0.61566,-0.158854>, r_tube
  <-0.470467,0.50086,-0.183197>, r_tube
  <-0.40801,0.394413,-0.1691>, r_tube
  <-0.334023,0.30712,-0.117419>, r_tube
  <-0.25909,0.241213,-0.0377131>, r_tube
  <-0.183871,0.185227,0.0516934>, r_tube
  <-0.10113,0.12015,0.12603>, r_tube
  <-0.00967469,0.0377333,0.16102>, r_tube
  <0.0802117,-0.052607,0.143564>, r_tube
  <0.155249,-0.138719,0.0798745>, r_tube
  <0.208447,-0.22491,-0.0054858>, r_tube
  <0.238327,-0.326429,-0.0819495>, r_tube
  <0.240674,-0.445975,-0.127431>, r_tube
  <0.209627,-0.568348,-0.133111>, r_tube
  <0.14547,-0.671566,-0.101091>, r_tube
  <0.05644,-0.736423,-0.0411369>, r_tube
  <-0.0439252,-0.751195,0.0324738>, r_tube
  <-0.139933,-0.713235,0.10353>, r_tube
  <-0.216669,-0.629224,0.156247>, r_tube
  <-0.262903,-0.514307,0.177581>, r_tube
  <-0.273887,-0.389587,0.159853>, r_tube
  <-0.252839,-0.276396,0.103685>, r_tube
  <-0.20702,-0.18625,0.0207241>, r_tube
  <-0.139505,-0.11168,-0.065168>, r_tube
  <-0.0512136,-0.0360848,-0.124241>, r_tube
  <0.0493591,0.043271,-0.134914>, r_tube
  <0.147818,0.115131,-0.0947626>, r_tube
  <0.235707,0.175384,-0.0209446>, r_tube
  <0.316152,0.236933,0.0594228>, r_tube
  <0.39272,0.316056,0.12236>, r_tube
  <0.458614,0.417212,0.154056>, r_tube
  <0.501281,0.533166,0.150658>, r_tube
  <0.510619,0.650727,0.115902>, r_tube
  <0.482425,0.755411,0.0585669>, r_tube
  <0.418592,0.834598,-0.0097525>, r_tube
  <0.326008,0.87934,-0.0763859>, r_tube
  <0.215307,0.885423,-0.128858>, r_tube
  <0.0995222,0.854311,-0.156131>, r_tube
  <-0.00819625,0.793863,-0.15023>, r_tube
  <-0.0988608,0.718087,-0.108484>, r_tube
  <-0.173898,0.643128,-0.0362995>, r_tube
  <-0.246251,0.57783,0.0505781>, r_tube
  <-0.32807,0.516436,0.129623>, r_tube
  <-0.418437,0.446379,0.182392>, r_tube
  <-0.506728,0.362056,0.201288>, r_tube
  <-0.581882,0.266476,0.187697>, r_tube
  <-0.636727,0.165385,0.14787>, r_tube
  <-0.667774,0.0634893,0.0897178>, r_tube
  <-0.673519,-0.0362793,0.021165>, r_tube
  <-0.653093,-0.132079,-0.0500853>, r_tube
  <-0.6059,-0.222057,-0.116135>, r_tube
  <-0.532393,-0.303254,-0.168334>, r_tube
  <-0.435711,-0.371145,-0.197371>, r_tube
  <-0.323661,-0.420206,-0.194544>, r_tube
  pigment { color rgb <0,0.25,1> }
  finish          
    {
    ambient 0.15
    diffuse 0.85
    brilliance 2
    phong 0.25
    phong_size 7.5
    }
  }

plane
  {
  <0,0,-1>, -0.33
  pigment { color White }
  finish
    {
    ambient 0.35
    diffuse 0.65
    }
  }