/*équations :S:=x^2*y-x*y^2+x*z^2-y;
0,1.,0,0,-1.,0,0,1.,0,0,0,0,0,0,0,-1.,0,0,0,0.

cylinder{< 0.,0.,-1.*b >,<0.,0.,b > ,r } 
cylinder{< 1.,-1.*b,-1.*b >,<1.,b,b > ,r } 
cylinder{< -1.,-1.*b,-1.*b >,<-1.,b,b > ,r } 
cylinder{< 1.,b,-1.*b >,<1.,-1.*b,b > ,r } 
cylinder{< -1.,b,-1.*b >,<-1.,-1.*b,b > ,r } 
cylinder{< -1.*b,0.,0. >,<b,0.,0. > ,r } 
cylinder{< -1.*b,-1.*b,1. >,<b,b,1. > ,r } 
cylinder{< -1.*b,-1.*b,-1. >,<b,b,-1. > ,r } 
 */

#include "colors.inc"
#include "stones.inc"
#include "metals.inc"

 camera { orthographic 
          location <-2.5,0.6,-3>*0.75 look_at<0,0.2,0> }
 
light_source { <-4,5,-10> color White}
light_source { <-5,10,-20> color White shadowless}
light_source { <3,10,-10> color rgb <0.8,0.8,1>*0.5 shadowless}

box {<-20,-1.3,-20>,<5,20,5> 
      pigment {SkyBlue}   // Yellow
      rotate <0,5, 0>  
        }
//--------------------------------

union{
poly {3, <0,1.,0,0,-1.,0,0,1.,0,0,0,0,0,0,0,-1.,0,0,0,0>

  texture{
     /* pigment{ granite color_map{[0.0 rgb<1,1,0.7>][1.0 rgb<0.5,0.3,0>]}
             scale 0.08   } */     
     T_Silver_3C  
                    
  finish { ambient 0.4 diffuse 0.3 reflection 0
           specular 0.5 roughness 0.008 }
  } 

}
#declare r=0.01 ;
#declare b=4;
union{
        cylinder{< 0.,0.,-1.*b >,<0.,0.,b > ,r } 
cylinder{< 1.,-1.*b,-1.*b >,<1.,b,b > ,r } 
cylinder{< -1.,-1.*b,-1.*b >,<-1.,b,b > ,r } 
cylinder{< 1.,b,-1.*b >,<1.,-1.*b,b > ,r } 
cylinder{< -1.,b,-1.*b >,<-1.,-1.*b,b > ,r } 
cylinder{< -1.*b,0.,0. >,<b,0.,0. > ,r } 
cylinder{< -1.*b,-1.*b,1. >,<b,b,1. > ,r } 
cylinder{< -1.*b,-1.*b,-1. >,<b,b,-1. > ,r } 
        pigment{ Red }
}
  // axes ----------------------
 union{          
   #declare g=1. ;
   #declare r1=0.03;
  
  #declare k=4;// longueur fleche=k*r1
  #declare co=1.8;// rayon base=co*r1
 cylinder{ <-g/2,0,0>,<g,0,0>,r1 }
  cone{ <g,0,0>,co*r1,<g+k*r1,0,0>,0  }
  
  cylinder{ <0,-g/2,0>,<0,g,0>,r1  }
  cone{ <0,g,0>,co*r1,<0,g+k*r1,0>,0  }
  
  cylinder{<0,0,-g/2>,<0,0,g>,r1  }
  cone{ <0,0,g>,co*r1,<0,0,g+k*r1>,0 }
  pigment { Yellow transmit 0.3}
   
}
  //-
    clipped_by { sphere{<0,0.,0>, 3 } }
  bounded_by { clipped_by }
  scale 0.5
  rotate <80,-40,110>
  translate <0,0.2,0>
}

text {	ttf "times.ttf" "AE"
        0.5,0 
        pigment { Cyan*1.2 }
        scale 0.08
        rotate <0,40,0> 
        translate <1.9,-1.3,-0.4> }