// Exemplo de arquivo de descricao de cena para POV-ray
// Last edited on 2017-05-07 20:10:09 by stolfilocal

// ======================================================================
// 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 < 1.00, 0.80, 0.10 > }
    finish{ diffuse 0.9 ambient 0.1 }
  }

#declare tx_peca = 
  texture{
    pigment{ color rgb < 0.5, 0.5, 0.5 > }
    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 }
  }

#declare tx_vidro = 
  texture{
    pigment{ color rgb < 0.85, 0.95, 1.00 > filter 0.70 }
    finish{ diffuse 0.03 reflection 0.25 ambient 0.02 specular 0.25 roughness 0.005 }
  }


#declare tx_xadrez =
  texture{
    pigment{ checker color rgb < 0.0, 0.0, 0.0 >, color rgb < 1.00, 0.97, 0.90 > }
    finish{ diffuse 0.9 ambient 0.1 }
    scale 1.0
  }

// ======================================================================
// DESCRIÇÃO DA CENA 
#include "eixos.inc"

// Partes da cena:
#declare raio = 5;
#declare grossura = 1;
#declare numero_bolas = 300;
#declare tx = tx_fosca;

#macro CordaCircular(raio, grossura, numero_bolas, tx)
  #declare i = 0;
  #while (i < numero_bolas)
  	sphere{ <raio*sin(2*pi*i/numero_bolas), 0, raio*cos(2*pi*i/numero_bolas)>, grossura texture {tx} }
	#declare i=i+1;
  #end  
#end

//CordaCircular(raio, grossura, numero_bolas, tx)

#declare lado = 10;
#declare n = 400;
#declare grossura = 1;
#declare tx = tx_fosca;

#macro CordaQuadrada(grossura, lado, n, tx)
  #declare i = 0;
  #declare tt = 0;
  #while (i < n)
    #if ((tt >= 0) & (tt < 1/4))
      #declare centro = <sin(2*pi*i/n),0,0>;
    #end 
    #if ((tt >= 1/4) & (tt < 1/2))
      #declare centro = <0,0,cos(2*pi*i/n)>;
    #end 
    #if ((tt >= 1/2) & (tt < 3/4))
      #declare centro = <sin(2*pi*i/n)+1,0,-1>;
    #end 
    #if ((tt >= 3/4) & (tt < 1))
      #declare centro = <1,0,cos(2*pi*i/n)-1>;
    #end 
    #declare i=i+1;
    #declare tt=tt+1/n;
  	sphere{ lado*centro, grossura texture {tx} }
  #end  
#end

//CordaQuadrada(grossura, lado, n, tx)


#declare lado = 40;
#declare n = 400;
#declare grossura = 1;
#declare tx = tx_fosca;

#macro Corda(grossura, lado, n, tx)
  #declare i = 0;
  #declare tt = 0;
  #while (i < n)
    #if ((i/n >= 0) & (i/n < 1/8))
      #declare centro = <0,0,i/n>;
    #end 
    #if ((i/n >= 1/8) & (i/n < 1/4))
      #declare centro = <((cos(pi*((i/n)-1/8)*4))*1/8)-1/8,0,((sin(pi*((i/n)-1/8)*4))*1/8)+1/8>;
    #end 
    #if ((i/n >= 1/4) & (i/n < 1/2))
      #declare centro = <((cos(pi*((i/n)-1/8)*4))*1/8)-1/8,0,((sin(pi*((i/n)-1/8)*4))*1/8)+1/4+1/8>;
    #end 
//    #if ((tt >= 3/4) & (tt < 1))
//      #declare centro = <1,0,cos(2*pi*i/n)-1>;
//    #end 
//    #if ((tt >= 0) & (tt < 1/4))
//      #declare centro = <sin(2*pi*i/n),0,0>;
//    #end 
//    #if ((tt >= 1/4) & (tt < 1/2))
//      #declare centro = <0,0,cos(2*pi*i/n)>;
//    #end 
//    #if ((tt >= 1/2) & (tt < 3/4))
//      #declare centro = <sin(2*pi*i/n)+1,0,-1>;
//    #end 
//   #if ((tt >= 3/4) & (tt < 1))
//      #declare centro = <1,0,cos(2*pi*i/n)-1>;
//    #end 
    #declare i=i+1;
  	sphere{ lado*centro, grossura texture {tx} }
  #end  
#end

Corda(grossura, lado, n, tx)



#include "camlight.inc"
#declare centro_cena = < 0, 0, 5 >;
#declare raio_cena = 50;
#declare dir_camera = < 10.00, 30.00, 5.00 >;
#declare dist_camera = 5*raio_cena;
#declare intens_luz = 1.20;
camlight(centro_cena, raio_cena, dir_camera, dist_camera , z, intens_luz)