#include  "colors.inc"

#declare  Length  = 2

// camera

camera {
     location  10*< 4, 3, -3 >
     direction 9*z
     up        y
     right     4/3*x
     look_at   < -1, 0, 0 >
}

// cubic surface

cubic {
//     x3  x2y  x2z  x2  xy2
     < 1,  0,   0,   0,   0,
//     xyz xy   xz2       xz   x
       0,  0,  -0.11111,  0,   0,
//     y3  y2z  y2  yz2  yz
       0,  0,   1,  0,   0,
//     y   z3   z2  z    Const
       0,  0,   0,  0,   0 >
     sturm
     pigment {
          color     Yellow
     }
     finish {
          diffuse   0.5
          brilliance 0.6
          phong     1
          phong_size 20
     }
     clipped_by {
          box {
               < -Length, -Length, -Length >,
               < Length, Length, Length >
          }
     }
}

// light source

light_source {
     < 5, 10, 0 >
     color  White
}

light_source {
     < 5, -10, -100 >
     color  White
}

background {
     color  SkyBlue
}