/*équations :
S:=x^2+y^2+z^3-3;
n:=3
suite:=0, 0, 0, 1., 0, 0, 0, 0, 0, 0, 0, 0, 1., 0, 0, 0, -1., 2., 0,-3
 */
#include "colors.inc"   
#include "metals.inc"
camera { orthographic 
          location <0,3.5,-3.5> look_at<0,-1,0> }
 
light_source { <-2,5,-5> color White shadowless}
light_source { <-5,5,-5> color rgb <1,1,1>*0.7 shadowless}
light_source { <5,5,-5> color rgb <0.8,0.8,1>*0.5 shadowless}
#declare MaFonction = function {cos (x*x+y*y + 10*z*z)}
 //    function {pigment{marble}} 
background { rgb<1,0.95,0.85>*0.95 } //<0.,0.5,0.95>*1.0
//background{Yellow*0.85}
//--------------------------------
   
poly{ 3, <0, 0, 0, 1., 0, 0, 0, 0, 0, 0, 0, 0, 1., 0, 0, 0, +1., 0, 0, -3>
     
  texture{     
        pigment { quilted 
                   color_map{[0.01  rgb<1,1,0>*0.8][0.5 rgb<1,0.8,0>*0.7] [1 rgb<0.8,0.6,0>*0.5]}}
       normal {
        quilted 2 // amount
        control0 0.6 // lower curvature (-1...1)
        control1 1  // upper curvature (-1...1)
      scale 0.04
      accuracy 0.02
    } 
  }
              
      finish { 
   ambient 0.5 diffuse 0.5 specular 0.4 reflection 0.1 }
      clipped_by { sphere{ 0,3.7} }
      bounded_by { clipped_by }
      rotate <-40,40,40>
   } // fin poly