#version unofficial MegaPov 0.7 ;

camera {
  location -5*z+0.5*x+0.5*y
  look_at 0.5*x+0.5*y
  angle 40
}

box {
  <0, -1, -1>, <2, 2, 1>
  pigment { color rgbf 1 }
  hollow
  interior {
    media {
      emission { 2, <0, 0, 8> extinction 4 }
      density {
        function { max ((x/4 - (z^2 + ((x/2)^2-y)^2)) * (4-x^2)/4, 0) }
      }
      method 3
    }
  }
//  scale <2, 1, 1>
}
plane {
  -z, -10
  pigment { checker color rgb 0.5 color rgb 0 }
  finish { ambient 1 diffuse 0 }
}