// MOD / Mushroom '03.06
// By Tsutomu HIGO  URL: http://www.asahi-net.or.jp/~nj2t-hg/

#version 3.5;
global_settings {
  max_trace_level 4
  assumed_gamma 2.2
  }

camera {
  location <3, 3, -5>
  look_at <-2, -0.4, 0>
  angle 70
  }

light_source {<-50, 20, -75> color rgb <1, 1, 1>}

isosurface {
  function {pow(mod(x+30,3)-1.5,2)+pow(mod(z+30,3)-1.5,2)+pow(y/5,2)-0.01/(cos(y)*cos(y)+0.01)-0.04/(1-y)}
  threshold 0
  max_gradient 100
  contained_by {box {<-6, -1.89, -6>, <60, 0.9999999999, 60>}}
  //open
  texture {
    pigment {color rgb <1, 1, 0.5>}
    finish {
      ambient 0.2
      diffuse 1
      reflection 0.6
      specular 0.8
      phong 0.5
      brilliance 1
      }
    }
  rotate z*180
  no_shadow
  }

background {color rgb <0.8, 0.6, 0>}