// STEP / The Ancient World '05.10
// By Tsutomu HIGO  URL: http://www.asahi-net.or.jp/~nj2t-hg/

#version 3.6;
global_settings {
  max_trace_level 4
  assumed_gamma 2.2
  }

camera {
  location <5, 7, -5>
  look_at <360, -150, 50>
  angle 70
  }

light_source { <2500, 1000, 100> color rgb <1, 0.6, 0.5> }

union {
  isosurface {
    function { y+int(6*(abs(mod(x,5)-2.5)+abs(mod(z,5)-2.5)))/6*1.41421356 }
    threshold 0
    max_gradient 50
    contained_by { box { <0, -2.8, 0>, <60, 1, 40> } }
    }
  plane { y, -2.7 }
  texture {
    pigment { color rgb <0.8, 1, 0.6> }
    finish {
      ambient 0.3
      diffuse 1
      reflection 0.5
      specular 0.8
      phong 0.5
      brilliance 1
      }
    }
  scale <4, 2, 4>
  rotate y*50
  }