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

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

#declare tx_plastico = 
  texture{
    pigment{ color rgb < 0.00, 0.00, 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_espelho = 
  texture{
    pigment{ color rgb < 1.00, 0.85, 0.30 > }
    finish{ diffuse 0.7 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 1 }
  }


#declare tx_xadrez =
  texture{
    pigment{ checker color rgb < 0.10, 0.32, 0.30 >, color rgb < 0.50, 0.37, 0.10 > }
    finish{ diffuse 0.9 ambient 0.1 }
    scale 2.0
  }

// ======================================================================
// DESCRIÇÃO DA CENA 

// Partes da cena:

#macro interpola_1 (tt, tt0, vv0, tt1, vv1)
    #local ss = (tt - tt0)/(tt1 -tt0);
    
    (vv0 + ss*(vv1 - vv0))
#end

#macro gera_segmento_1 (m, p0, r0, p1, r1)
    union{
        #declare i = 0;
        #while (i < m)
            object { sphere{ interpola_1(i/m * p1 + (1 - i/m) * p0 , 0, p0, m, p1), i/m * r1 + (1 - i/m) * r0 }
                     texture {tx_plastico}
            }
            
            #declare i = i + 1;
        #end
    }
    
#end

#macro interpola_3 (tt, t0, t1, A, B, C ,D);
    #local AB = interpola_1(tt, t0, A, t1, B);
    #local BC = interpola_1(tt, t0, B, t1, C);
    #local CD = interpola_1(tt, t0, C, t1, D);
    
    #local ABC = interpola_1(tt, t0, AB, t1, BC);
    #local BCD = interpola_1(tt, t0, BC, t1, CD);
    #local ABCD = interpola_1(tt, t0, ABC, t1, BCD);
    
    ABCD
#end

/*#macro gera_segmento_3(m, pa, ra, pb, rb, pc, rc, pd, rd)
    union {
        #declare i = 0;
        #while
            object sphere { interpola_3(i/m * p1 + (1 - i/m) * p0, 0, m, pa, pb, pc, pd), 
            #declare i = i + 1;
        #end
    
    }

#end*/

#macro define_tentaculo (n, pa, pb, pc, pd)


#end

#include "eixos.inc"

// Aqui está a cena, finalmente:

union{
  //object{ eixos(3.00) }

  object { gera_segmento_1 (20, <0, 0, 0> , 0.5, <10, 10, 10>, 2.0) }
}

#include "camlight.inc"
#declare centro_cena = < 0.0, 5.0, 3.0 >;
#declare raio_cena = 19.0;
#declare dir_camera = < 30.00, -5.00, 4.00 >;
#declare dist_camera = 16.0;
#declare intens_luz = 1.50;
camlight(centro_cena, raio_cena, dir_camera, dist_camera , z, intens_luz)