//EXAMPLE OF PYRAMID AS THE INTERSECTION OF PLANES

//Files with predefined colors and textures
#include "colors.inc"
#include "glass.inc"
#include "golds.inc"
#include "metals.inc"
#include "stones.inc"
#include "woods.inc"

//Place the camera
camera {
  sky <0,0,1>          //Don't change this
  direction <-1,0,0>   //Don't change this  
  right <-4/3,0,0>     //Don't change this
  location  <30,10,10>  //Camera location
  look_at   <0,0,0>    //Where camera is pointing
  angle 10      //Angle of the view--increase to see more, decrease to see less
}

//Ambient light to "brighten up" darker pictures
global_settings { ambient_light White }

//Place a light--you can have more than one!
light_source {
  <10,-10,10>   //Change this if you want to put the light at a different point
  color White*2        //Multiplying by 2 doubles the brightness
}

//Set a background color
background { color White }

//Create a "floor"
plane {
  <0,0,1>, 0           //This represents the plane 0x+0y+z=0
  texture { T_Silver_3A }  //The texture comes from the file "metals.inc"
}

//Construct a square-based pyramid by intersecting its planes

//Define the coordinates of the five vertices
#declare plane1 = plane {<1,1,1>,1};    //x+y+z=0 moved 1 unit
#declare plane2 = plane {<1,-1,1>,1};   //x-y+z=0 moved 1 unit
#declare plane3 = plane {<-1,1,1>,1};   //-1+y+z=0 moved 1 unit
#declare plane4 = plane {<-1,-1,1>,1};  //-x-y+z=0 moved 1 unit
#declare plane5 = plane {<0,0,-1>,0};   //0x+0y-z=0 moved 1 unit

//Define the pyramid to be the intersection of its faces.
#declare mypyramid = object { intersection {
  object{plane1}
  object{plane2} 
  object{plane3} 
  object{plane4} 
  object{plane5}
  }
  texture {T_Stone1}
  };

//Display the pyramid
mypyramid