// CORES E TEXTURAS

#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 }
  }

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

// DESCRIÇÃO DA CENA 

#macro CriaCurva(raio)
  #declare curva =
  spline { natural_spline
    -0.25, < 0.0,-5.0,-1.0>,
    0.00, < 0.0, 0.0, 0.0>,
    0.25, < 0.0, 5.0, 4.0>,
    0.50, < 1.5, 6.0,12.0>,
    0.75, < 8.0, 4.0,18.5>,
    1.00, <15.0, 5.0,20.0>,
    1.25, <20.0, 5.0,19.4>
  }
#end

#macro palito(R, N, p, q, uu)
  #local dx = q.x - p.x;
  #local dy = q.y - p.y;
  #local m = dy/dx;
  #local dist = sqrt(pow(dx, 2.0) + pow(dy, 2.0));
  #local points = dist/(m*uu);
  #local curva = spline { natural_spline
    #local i = 0;
    #while (i <= points)
	i,  <p.x + i * m, p.y, p.z>,
    #local i = i + uu;
    #end
  }

  #local palto = union {
  #local i = 0;
  #while (i < points)
    sphere{ <0,0,0>, R 
      pigment{ color rgb<1,0.3,0>}
      translate curva(i)
    }
    #declare i = i + uu;
  #end
  }

  palto
#end

#macro CriaNo(n_voltas, raio_corda, espacamento_entre_bolas)
  #declare uu = 0.1;
  #declare bolas = 10;

  #declare p = <0.5, 0.8,0>;
  #declare q = <0.7, 0.9,0>;

  #declare palitos = array[2];
  #declare palitos[0] = palito(1, 10, p, q, uu);
  #declare palitos[1] = palito(1, 10, < 0.5, 0.8, 0>, <1, 1.5, 0>, uu);

  union {
  #declare i = 0;
  #while (i < 2)
    object { palitos[i] }
    #declare i = i + 1;
  #end
  }

#end 

CriaNo(5, 1, 1)

#include "camlight.inc"
#declare centro_cena = < 0.00, 0.00, 0.00 >;
#declare raio_cena = 30.0;
#declare dir_camera = < 10.00, 10.00, 10.00 >;
#declare dist_camera = 2*raio_cena;
#declare intens_luz = 1.20;
camlight(centro_cena, raio_cena, dir_camera, dist_camera , z, intens_luz)