Here's the second one.  It's pretty abstract: The yang collaspes and the yin
rules.  In the absence of harmony, chaos overwhelms.


#version 3.6;

#include "functions.inc"

// ----------------------------------------

global_settings {
  assumed_gamma 1.0
}

#default {
 texture {
  pigment {
   color rgb 1
  }
  finish {
   ambient 0
   diffuse 1
  }
 }
}

// ----------------------------------------

camera {
 location <0.0, 1.0, 0.0>
 direction 1.5*z
 right x*image_width/image_height
 look_at <0.0, 0.0,  0.0>

 aperture .6
 variance 1/1000000
 confidence 0.9
 blur_samples 100
 focal_point <0, -0.24, 0>
}

// ----------------------------------------

light_source {
 <0.0, 2.8, 0.0>
 color rgb 0.5
 fade_distance 3.75
 fade_power 100
}

light_source {
 <0.0, 1.0, 0.0>
 color rgb 0.5
 fade_distance 1.3
 fade_power 50
}

// ----------------------------------------

// A wave plane to see the shadow
plane {
 y, -0.95
 texture {
  pigment {
   color rgb <0.8, 0.8, 1.0>
  }

  normal {
   waves
   scale <.1, 1, .1>
  }
  finish {
   phong 2
   phong_size 1
  }

 }
}

// ----------------------------------------

// The yang
sphere {
 <0, -0.5, 0>
 0.2
 texture {
  pigment {
   color rgb <1, 1, 1>
  }
 }
}

// ----------------------------------------

// The yin shadow
union
{
isosurface {
 function{ f_comma( x,y,z, 1) }
 contained_by {sphere { 0, 1.5 } }
 scale <.1, .05, .1>
 rotate <0, -90, 0>
 translate <0, 2, 0>
 pigment { color rgb 1 }
}

sphere {
 <0, 0, -.05>
 .02
 translate <0, 2, 0>
}

torus {
 .1, .01
 translate <0, 2, 0>
}
}

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