// CASSINI / Exchanging coordinates - Parabolic translation '03.05
// By Tsutomu HIGO  E-mail: nj2t-hg@asahi-net.or.jp

#version 3.5;
global_settings {
  max_trace_level 4
  assumed_gamma 2.2
  }

camera {
  location <2, 10, -30>
  look_at <-1.2, -1.1, 0>
  angle 8
  }

light_source {<-50, 150, -75> color rgb <0.8, 0.8, 0.8>}

isosurface {
  function {pow(x*x+pow(y+0.5*(x*x+z*z),2)+z*z,2)-0.98*4*z*z*x*x-pow(1,4)}
  threshold 1
  max_gradient 1000000
  contained_by {box {<-3, -5, -3>, <3, 1.5, 3>}}
  texture {
    pigment {color rgb <1, 1, 0.5>}
    finish {
      ambient 0.2
      diffuse 1
      reflection 0.5
      specular 1
      phong 0.5
      brilliance 1
      }
    }
  scale 1/vlength(1)
  rotate y*15
  rotate z*-80
  rotate y*-60
  no_shadow
  }

background {color rgb <0, 0.2, 0.7>}