// Exemplo de arquivo de descricao de cena para POV-ray
// Last edited on 2021-12-09 05:23:29 by stolfi

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

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

#declare tx_plastico = 
  texture{
    pigment{ color rgb < 0.10, 0.80, 1.00 > }
    finish{ diffuse 0.8 ambient 0.1 specular 0.5 roughness 0.005 }
  }

#declare tx_fosca = 
  texture{
    pigment{ color rgb < 0.54, 0.80, 0.10 > }
    finish{ diffuse 0.9 ambient 0.1 }
  }

#declare tx_espelho = 
  texture{
    pigment{ color rgb < 1.00, 0.85, 0.30 > }
    finish{ diffuse 0.2 reflection 0.7*< 1.00, 0.85, 0.30 > ambient 0.1 }
  }


// ======================================================================
// DESCRI��O DA CENA 

#include "eixos.inc"

#macro alien(raio)
  
union{
   cylinder{
    < raio/3, 0, 0 >,
    < raio/3, 0, -raio/2 >,
    raio/4
    texture{tx_fosca}
  }
  cylinder{
    < -raio/3, 0, 0 >,
    < -raio/3, 0, -raio/2 >,
    raio/4
    texture{tx_fosca}
  }
   cone{<0, 0, 0>, raio, <0, 0, 2*raio>, 0
  texture{tx_fosca}
} 
  sphere{ < 0, -raio/2, raio >, raio/4 } 
  texture{tx_espelho}
  }
#end

#macro soldier(side)
  union{
    box{<-side, -side, -side>, <side, side, side>
    texture{tx_plastico}
    }
    cylinder{<0,0,0>, <0, 3*side, side>, side/4
    texture{tx_plastico}
    }
    cone{<0, 3*side, side>, side/3, <0, 4*side, 2*side>, 0
    texture{tx_fosca}
    }
  }
#end

#macro exercitoAlien(I,J,S)
  union{
     #local  i = -I/2;
    #while (i < I/2)
      #local j = 0;
      #while (j < J)
        #if(sin(i*j) > 0.1)
          object{alien(S) translate <i, j+1, 0> }
        #end
        #local j = j+1;
      #end
      #local i = i+1;
    #end
  }
#end

#macro exercitoSoldier(I,J,S)
  union{
    #local  i = -I/2;
    #while (i < I/2)
      #local j = 0;
      #while (j < J/2)
      #if(sin(i*j) < 0.1)
        object{soldier(S) translate <i, -j-1, 0> }
      #end
        #local j = j+1;
      #end
      #local i = i+1;
    #end
  }
#end

// Aqui est� a cena, finalmente:

union{
  object{exercitoAlien(24,8, 0.45)}
  object{exercitoSoldier(16,32, 0.18)}
}


#include "camlight.inc"
#declare centro_cena = < -2, -2, 0.8 >;
// sphere{ centro_cena, 1 texture{ tx_fosca } }
object{ eixos(1) }
#declare raio_cena = 18;
#declare dir_camera = < 20, -20, 10 >;
#declare dist_camera = 10*raio_cena;
#declare intens_luz = 1.20;
camlight(centro_cena, raio_cena, dir_camera, dist_camera , z, intens_luz)