// Exemplo de arquivo de descricao de cena para POV-ray
// Last edited on 2010-03-04 15:44:01 by stolfi

// ======================================================================
// CORES E TEXTURAS

background{ color rgb < 0.75, 0.80, 0.85 > }

#declare tx_vidro = 
  texture{
    pigment{ color rgb < 0.85, 0.95, 1.00 > filter 0.40 }
    finish{ diffuse 0.03 reflection 0.25 ambient 0.02 specular 0.25 roughness 0.005 }
  }

#declare tx_xadrez =
  texture{
    pigment{ checker color rgb < 0.90, 0.12, 0.20 >, color rgb < 1.00, 0.97, 0.90 > }
    finish{ diffuse 0.9 ambient 0.1 }
    scale 2.0
  }

// ======================================================================

// Partes da cena: 

#declare chao = 
  box{ <-20,-20,-1>, <+20,+20,0> }

#declare octaedro = intersection {
  #local normals = array[8];
  #local normals[0] = <+1,+1,+1>;
  #local normals[1] = <+1,+1,-1>;
  #local normals[2] = <+1,-1,+1>;
  #local normals[3] = <+1,-1,-1>;
  #local normals[4] = <-1,+1,+1>;
  #local normals[5] = <-1,+1,-1>;
  #local normals[6] = <-1,-1,+1>;
  #local normals[7] = <-1,-1,-1>;
  
  #local i=0;
  #while (i<8)
    plane { normals[i], 1 }
    #local i=i+1;
  #end
}

#declare dodecaedro = intersection {
  #local fi = (sqrt(3)-1)/2;
  
  #local normals = array[12];
  #local normals[0] = <+1,0,+fi>;
  #local normals[1] = <+1,0,-fi>;
  
  #local normals[2] = <-1,0,+fi>;
  #local normals[3] = <-1,0,-fi>;
  
  #local normals[4] = <+fi,+1,0>;
  #local normals[5] = <+fi,-1,0>;
  
  #local normals[6] = <-fi,+1,0>;
  #local normals[7] = <-fi,-1,0>;
  
  #local normals[8] = <0,+fi,+1>;
  #local normals[9] = <0,+fi,-1>;
  
  #local normals[10] = <0,-fi,+1>;
  #local normals[11] = <0,-fi,-1>;
  
  #local i=0;
  #while (i<12)
    plane { normals[i], 1 }
    #local i=i+1;
  #end
}

declare icosaedro = intersection {
  object { dodecaedro 
    scale 1.06 
    texture { tx_vidro } 
    interior { ior 1.2 }
  }
  
  object { octaedro 
    texture { tx_vidro } 
    interior { ior 1.2 }
  }
  
}

#declare cubo =
  box { <-0.5,-0.5,-0.5> <0.5,0.5,0.5> }
  
#declare cubo_octa = intersection {
  object { cubo 
    scale 1.75 
    texture { tx_vidro } 
    interior { ior 1.2 }
  }
  
  object { octaedro 
    texture { tx_vidro } 
    interior { ior 1.2 }
  }
}

#declare chao = 
  box{ <-20,-20,-1>, <+20,+20,0> }

#include "eixos.inc"

// Aqui está a cena, finalmente:

union{
  object { eixos(3.00) }
  
  object{ chao  translate < 0,0,-3 > texture{ tx_xadrez } }

  object { icosaedro translate <0,+3,1> }
  object { cubo_octa translate <0,-3,1> }
}

#include "camlight.inc"
#declare centro_cena = < 0.00, 0.00, 1.00 >;
#declare raio_cena = 6.5;
#declare dir_camera = < 14.00, 7.00, 4.00 >;
#declare dist_camera = 16.0;
#declare intens_luz = 1.00;
camlight(centro_cena, raio_cena, dir_camera, dist_camera , z, intens_luz)