camera { location <0,20,-20> look_at <0,12,0> }

light_source {
  <100,100,-20>
  color rgb <1,1,1>
}

#declare gradx = pigment
{
  gradient x
  color_map {
    [0  rgb<0,0,1>]
    [1  rgb<1,1,1>]
  } scale 2
  translate -x
}
// sky sphere is blue at horizon, black at very top
sky_sphere {
  pigment { gradx }
  pigment{ gradient y pigment_map {
    [0  gradx]
    [1  color rgb<0,0,0>]
  }}
}

// here is our wavy plane.... single wave source off to the right
global_settings { number_of_waves 1 }
plane {
  y, 0
  texture {
    pigment { color rgbt<.8,.8,.8,.15> } // change the transmit to 0
    normal { waves .1 scale 2 translate 200*x}
    finish { reflection .3} // change this to 1.0
  }
  interior {ior 1.5 }
}

// here is a checkered plan 10 units below the wavy plane
plane{
  y,-10
  texture {
    pigment {
      checker
        color rgb<1,0,0>
        color rgb<0,0,1>
      }
    scale 10
  }
  finish { ambient 1 }
}