File:Blue 8 2 Knot Animated.gif

#include "colors.inc"

background { color White }

global_settings { assumed_gamma 1.0}

camera
  {
  location <0, 0, -250>
  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 = 0.7;  // thickness (radius) of tube

sphere_sweep
  {
  cubic_spline 111,
  <-7.916201, -0.122531, 1.280471>, r_tube
  <-8.308537, -1.080867, 0.762935>, r_tube
  <-8.491145, -2.035452, 0.141546>, r_tube
  <-8.435180, -2.963786, -0.536674>, r_tube
  <-8.121889, -3.830097, -1.224991>, r_tube
  <-7.550695, -4.590823, -1.871478>, r_tube
  <-6.746120, -5.207019, -2.417574>, r_tube
  <-5.754320, -5.653877, -2.801831>, r_tube
  <-4.640781, -5.926492, -2.963093>, r_tube
  <-3.487720, -6.038135, -2.849143>, r_tube
  <-2.390337, -6.017364, -2.429979>, r_tube
  <-1.438059, -5.915530, -1.717141>, r_tube
  <-0.657427, -5.822639, -0.776691>, r_tube
  <0.038390, -5.849468, 0.257804>, r_tube
  <0.802001, -6.006113, 1.208063>, r_tube
  <1.733219, -6.193626, 1.935325>, r_tube
  <2.817910, -6.327770, 2.368047>, r_tube
  <3.975010, -6.360369, 2.490075>, r_tube
  <5.116531, -6.257380, 2.330256>, r_tube
  <6.168335, -5.989670, 1.942825>, r_tube
  <7.069551, -5.534734, 1.392114>, r_tube
  <7.763927, -4.887093, 0.745915>, r_tube
  <8.206746, -4.068382, 0.073753>, r_tube
  <8.375796, -3.125336, -0.560907>, r_tube
  <8.280021, -2.115651, -1.106137>, r_tube
  <7.955480, -1.088367, -1.524147>, r_tube
  <7.455541, -0.071470, -1.782049>, r_tube
  <6.839632, 0.924946, -1.842053>, r_tube
  <6.176990, 1.897705, -1.658002>, r_tube
  <5.556754, 2.843060, -1.192393>, r_tube
  <5.098357, 3.782355, -0.473497>, r_tube
  <4.907382, 4.805311, 0.298480>, r_tube
  <4.903632, 5.993855, 0.780821>, r_tube
  <4.838435, 7.255097, 0.764666>, r_tube
  <4.526010, 8.365174, 0.271940>, r_tube
  <3.913852, 9.107148, -0.527731>, r_tube
  <3.052734, 9.352647, -1.401542>, r_tube
  <2.056607, 9.082627, -2.114091>, r_tube
  <1.067981, 8.387965, -2.466327>, r_tube
  <0.217537, 7.459920, -2.333915>, r_tube
  <-0.424335, 6.556107, -1.700697>, r_tube
  <-0.901483, 5.927505, -0.679472>, r_tube
  <-1.387574, 5.711143, 0.505321>, r_tube
  <-2.088296, 5.861154, 1.579627>, r_tube
  <-3.085000, 6.200408, 2.301696>, r_tube
  <-4.287968, 6.520046, 2.527289>, r_tube
  <-5.503918, 6.651305, 2.237365>, r_tube
  <-6.522258, 6.498121, 1.525969>, r_tube
  <-7.174804, 6.040301, 0.566479>, r_tube
  <-7.369240, 5.324001, -0.432244>, r_tube
  <-7.101818, 4.442690, -1.264802>, r_tube
  <-6.453311, 3.513491, -1.767048>, r_tube
  <-5.567096, 2.653815, -1.848112>, r_tube
  <-4.609625, 1.951363, -1.509434>, r_tube
  <-3.710717, 1.432096, -0.846215>, r_tube
  <-2.895179, 1.022740, -0.020869>, r_tube
  <-2.079930, 0.568670, 0.777071>, r_tube
  <-1.194869, -0.045795, 1.362112>, r_tube
  <-0.261054, -0.808829, 1.588281>, r_tube
  <0.649683, -1.613404, 1.397306>, r_tube
  <1.460893, -2.357687, 0.841114>, r_tube
  <2.107380, -3.064466, 0.065387>, r_tube
  <2.545584, -3.876542, -0.741208>, r_tube
  <2.741751, -4.882189, -1.401253>, r_tube
  <2.659534, -6.031500, -1.784646>, r_tube
  <2.281046, -7.181964, -1.831668>, r_tube
  <1.629078, -8.165687, -1.557322>, r_tube
  <0.768826, -8.839580, -1.032862>, r_tube
  <-0.205666, -9.110175, -0.363874>, r_tube
  <-1.187080, -8.940837, 0.328482>, r_tube
  <-2.066660, -8.353199, 0.920446>, r_tube
  <-2.748631, -7.426308, 1.299799>, r_tube
  <-3.162313, -6.290556, 1.382017>, r_tube
  <-3.278571, -5.109224, 1.130461>, r_tube
  <-3.114425, -4.037515, 0.576288>, r_tube
  <-2.711128, -3.158512, -0.174630>, r_tube
  <-2.099258, -2.427788, -0.954107>, r_tube
  <-1.305068, -1.710045, -1.564534>, r_tube
  <-0.382216, -0.944992, -1.839169>, r_tube
  <0.588813, -0.210230, -1.698678>, r_tube
  <1.525224, 0.377696, -1.175949>, r_tube
  <2.380572, 0.764838, -0.393299>, r_tube
  <3.200437, 1.012067, 0.480512>, r_tube
  <4.098768, 1.270835, 1.270663>, r_tube
  <5.122590, 1.671535, 1.811566>, r_tube
  <6.188241, 2.259172, 1.977443>, r_tube
  <7.133018, 3.004032, 1.717810>, r_tube
  <7.783544, 3.830244, 1.073053>, r_tube
  <8.003078, 4.640300, 0.166067>, r_tube
  <7.725270, 5.337272, -0.819386>, r_tube
  <6.972911, 5.842979, -1.668387>, r_tube
  <5.866007, 6.124249, -2.170634>, r_tube
  <4.611978, 6.219737, -2.172365>, r_tube
  <3.450262, 6.270221, -1.647328>, r_tube
  <2.519620, 6.506199, -0.768902>, r_tube
  <1.730046, 7.086623, 0.094235>, r_tube
  <0.857677, 7.873891, 0.601963>, r_tube
  <-0.203069, 8.542302, 0.654755>, r_tube
  <-1.374881, 8.812032, 0.349253>, r_tube
  <-2.488420, 8.548360, -0.115202>, r_tube
  <-3.375501, 7.777537, -0.498883>, r_tube
  <-3.948137, 6.673229, -0.581100>, r_tube
  <-4.281333, 5.496224, -0.235788>, r_tube
  <-4.627511, 4.453940, 0.451375>, r_tube
  <-5.180819, 3.553013, 1.161328>, r_tube
  <-5.897407, 2.675163, 1.627803>, r_tube
  <-6.654383, 1.765581, 1.777237>, r_tube
  <-7.349912, 0.828881, 1.639919>, r_tube
  <-7.916201, -0.122531, 1.280471>, r_tube
  <-8.308537, -1.080867, 0.762935>, r_tube
  <-8.491145, -2.035452, 0.141546>, r_tube
  rotate <0,360*clock,0>
  pigment { color rgb <0,0.25,1> }
  finish          
    {
    ambient 0.15
    diffuse 0.85
    brilliance 2
    phong 0.25
    phong_size 7.5
    }
  rotate <0,360*clock,0>
  }

plane
  {
  <0,0,-1>, -10.0
  pigment { color White }
  finish
    {
    ambient 0.35
    diffuse 0.65
    }
  }