#declare Function_1 = function{ pow(sin(y),2) }
pigment{ function{ Function_1 (x,5*y,z) }
         color_map { [0.0 color rgb <1,0.5,0>]
                     [1.0 color rgb <1,1,1>]
                   } // end of color_map
        } // end of pigment

#declare Function_1 = function{ pow(sin(y),2) }
pigment{ color rgb <1,1,1>}
normal { function{ Function_1 (x,4*y,z) }
         bump_size 1 scale 0.5
       } // end of normal

pigment{ slope{ <0, 1,0> , -1.5, 0.35}
         //<direction>[, Lo_slope, Hi_slope ]
         color_map{[0.0 color rgb <0,1,0>]
                   [0.1 color rgb <1,0,0>]
                   [0.2 color rgb <1,1,0>]
                   [1.0 color rgb <1,1,1>]
                  }//end of color_map
        } // end of pigment

pigment{ slope{ <0,-1,0> , 0.0, 0.22}
         // <direction> [, Lo_slope, Hi_slope ]
    //altitude <Alt_Direction>, Lo_alt, Hi_alt
         color_map{[0.0 color rgb<0.2,0.7,0.2>]
                   [0.1 color rgb<0.5, 1, 0.5>]
                   [0.2 color rgb<  1, 1, 0>]
                   [1.0 color rgb<  1, 0, 0>]
                  }//end of color_map
        } // end of pigment