// PETAL / Twin Calyces '03.12
// By Tsutomu HIGO  URL: http://www.asahi-net.or.jp/~nj2t-hg/

#version 3.5;
global_settings {
  max_trace_level 5
  assumed_gamma 2.2
  }

isosurface {
  function {x*x+z*z-9*sin(12*(y-0.2*y/abs(y+0.0000001)*(x*x+z*z)))
    *sin(6*atan(z/x)+3*(y-0.2*y/abs(y+0.0000001)*(x*x+z*z)))*sin(pi*y/3)}
  threshold 0
  max_gradient 100
  contained_by {box {<-3, -3, -3>, <3, 3, 3>}}
  texture {
    pigment {color rgbt <1, 1, 1, 0.9>}
    finish {
      ambient 0.1
      diffuse 1
      reflection 0.7
      specular 0.8
      phong 0.5
      brilliance 1
      }
    }
  no_shadow
  scale <3, 4, 3>
  rotate z*90
  }

background {color rgb <0, 0.2, 0.1>}

camera {
  location <0, 0, 15>
  angle 102
  look_at <0, 0, 0>
  }

light_source {<100, 50, 100> color rgb <0.6, 0.6, 0.2>}