You can use slope to, and no lights:

camera{location -z*10 look_at 0}

#local TEX = texture{
  pigment{slope{<0,0,-10>} //the vector should be your camera position
    pigment_map{
    [0.25 rgb 1 transmit 0.5]
    [0.75 rgb 0 transmit 0.5]
    }
  }
  normal{agate scale 0.2}
  finish{ambient 1 diffuse 0} //the ambient controls the brightness
}

sphere{0,1 texture{TEX}}

-------------------------------
Wagner

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