// RONDO / Rondo02 '02.09
// By Tsutomu HIGO  E-mail: nj2t-hg@asahi-net.or.jp

#version 3.5;
global_settings {
  max_trace_level 3
  assumed_gamma 2.2
  }

#include "functions.inc"

union{
  #declare I=0; #while (I<120)
    isosurface {
      function { (x-0.2*sin(3*pow(y,0.6)))*(x-0.2*sin(3*pow(y,0.6)))+z*z-0.05*sin(2*pi*y/15) }
      threshold 0
      contained_by { box {<-0.4, 0, -0.3>, <0.4, 8, 0.3>} }
      max_gradient 1
      translate y*2
      rotate <0, 0, I*10>
      translate z*2*I
      }
  #declare I=I+1; #end
  texture {
    pigment { color rgb <0.9, 0.95, 1> }
    finish {
      ambient 0.35
      diffuse 0.7
      reflection 0
      brilliance 0.7
      }
    }
  rotate z*60
  no_shadow
  }

camera {
  location  <0, 0, -10>
  angle 52
  look_at <-2.6, 0.5, 0>
  }

light_source { <500, 1000, -500> color rgb 1 }

background { color rgb <0.05, 0.1, 0.2> }