//Displaying the stella octangula using POV-Ray

//Load some interesting colors and textures
#include "colors.inc"
#include "stones.inc"
#include "glass.inc"
#include "metals.inc"
#include "woods.inc"

//Describe the location of the camera and where it is aimed
camera { location <.5,2,-4>
  look_at <0,0,0> 
  }

//Define a background color
background { color White }

//Describe the location and color of the light source
light_source { 
  <2,3,-5>
  color White*3
  }
 
//Define the coordinates of the eight vertices
#declare p1 = <-1,-1,-1>
#declare p2 = <-1,-1,1>
#declare p3 = <-1,1,-1>
#declare p4 = <-1,1,1>
#declare p5 = <1,-1,-1>
#declare p6 = <1,-1,1>
#declare p7 = <1,1,-1>
#declare p8 = <1,1,1>

//Define the polygons for each of the four sides of the first tetrahedron.
//Notice that the last point must be a repetition of the first. 
//The number "4" indicates that four points will be listed.
#declare f1 = polygon { 4, p1, p4, p6, p1 }
#declare f2 = polygon { 4, p1, p4, p7, p1 } 
#declare f3 = polygon { 4, p1, p6, p7, p1 }
#declare f4 = polygon { 4, p4, p6, p7, p4 }

//Define the first tetrahedron to be the union of its faces.
#declare tetra1 = union { 
  object{f1}
  object{f2} 
  object{f3} 
  object{f4} 
  }

//Give the tetrahedron some texture.
#declare tetra1a = object { 
  tetra1 
  texture { T_Wood1} 
  }   

//Define the polygons for the the four sides of the second tetrahedron.  
#declare f5 = polygon { 4, p2, p3, p5, p2 }
#declare f6 = polygon { 4, p2, p3, p8, p2 } 
#declare f7 = polygon { 4, p2, p5, p8, p2 }
#declare f8 = polygon { 4, p3, p5, p8, p3 }

//Define the second tetrahedron to be the union of its faces.
declare tetra2 = union { 
  object{f5}
  object{f6} 
  object{f7} 
  object{f8} 
  }

//Give the second tetrahedron some texture.
#declare tetra2a = object { 
  tetra2 
  texture { T_Wood1 } 
  } 

//Define a horizontal plane on which to place the tetrahedra (optional).
#declare table = object { 
  plane { <0,1,0>,-1 
    texture { T_Stone18 }
    } 
  } 

//List the objects to display
tetra1a
tetra2a
table