global_settings {
  assumed_gamma 1.0
//  noise_generator 2
}

camera {
  orthographic
  location <0,0,-1.5>
  look_at  <0,0,0>
}

// ------------------------------
// texture 1

#declare T1 = texture {
  pigment {
    bumps
    pigment_map {
      [0.0 rgb 0]
      [1.0 rgb 1]
    }
  }
  finish {ambient 1  diffuse 0}
  scale 0.2
}

// ------------------------------
// texture 2

#declare T2a = texture {
  pigment {rgb 0}
  finish {ambient 1  diffuse 0}
}

#declare T2b = texture {
  pigment {rgb 1}
  finish {ambient 1  diffuse 0}
}

#declare T2 = texture {
  bumps
  texture_map {
    [0.0 T2a]
    [1.0 T2b]
  }
  scale 0.2
}

// -----------------------------

box {-0.5, 0.5
  texture {T1}
  translate -x*0.5
}

box {-0.5, 0.5
  texture {T2}
  translate x*0.5
}