// Boolesche Operationen, Beispiel 2
// ---------------------------------------------------------------
#version 3.5;                         // benötigte POV-Ray-Version
#include "colors.inc"                 // Defintion der Farben
#include "textures.inc"               // vordefinierte Oberflächen
background {White}                    // Farbe des Hintergrundes

camera {
   location <-15, 20, -50>
   direction <0.0, 0.0,  1.0>
   up  <0.0, 0.5, 0.0>
   right <2/3, 0.0, 0.0>
   look_at <0, -1, 0>          }

light_source { <-10, 20, -25> color White }
light_source { <0, 0, 0> color White }

difference  {
  intersection {
   cylinder {<-1,0,0>,<1,0,0>,1} 
   cylinder {<0,-1,0>,<0,1,0>,1} 
                  }      
   union  {
     cylinder {<-1,0,0>,<1,0,0>,0.5}    
     cylinder {<0,-1,0>,<0,1,0>,0.5}      
                  }            
   texture {  finish {ambient 0.25 }    pigment {  color rgb <0.5, 0.5, 0.5>  }      }
   scale 10
   rotate y*45
}