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

background{ color rgb < 0.5, 0.5, 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_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 >, color rgb < 1,1,1 > }
    finish{ diffuse 0.9 ambient 0.1 }
    scale 2.0
  }

// ======================================================================
// DESCRICAO DA CENA 

#declare passos = 500;
#declare ints = 5;
#declare intf = ints;

#macro interpolin(t0, v0, t1, v1, tt)
	#local r = (tt-t0)/(t1-t0);
	#local s = 1-r;
	#local vv = s*v0 + r*v1;
	
	vv
#end

#macro arcobezier(t0, t1, A, B, C, D, tt)
	#local AB = interpolin(t0, A, t1, B, tt);
	#local BC = interpolin(t0, B, t1, C, tt);
	#local CD = interpolin(t0, C, t1, D, tt);
	
	#local ABC = interpolin(t0, AB, t1, BC, tt);
	#local BCD = interpolin(t0, BC, t1, CD, tt);
	
	#local ACBD = interpolin(t0, ABC, t1, BCD, tt);
	
	ACBD
#end

#macro curva(P0, P1)
    #local p0 = P0[0];
    #local v0 = P0[1];
    
    #local p1 = P1[0];
    #local v1 = P1[1];

	#local i = 0;
	#while(i <= passos)
		#local p = arcobezier(0, passos, p0, p0+v0, p1-v1, p1, i);
		
		sphere{ p, 0.5 texture{tx_fosca}}
		
		#declare i = i+1;
	#end
#end

#declare nPontos = 6;


#declare pontos = array[nPontos];
#declare i = 0;
#while (i<nPontos)
    #declare pontos[i] = array[2];
    #declare i = i+1;
#end

#declare pontos[0][0] = <-5, 10, 0>;
#declare pontos[1][0] = <0, -2.5, 0>;
#declare pontos[2][0] = <5, 10, 0>;
#declare pontos[3][0] = <5, -10, 0>;
#declare pontos[4][0] = <0, 2.5, 0>;
#declare pontos[5][0] = <-5, -10, 0>;

#declare pontos[0][1] = <5, 0, 0>;
#declare pontos[1][1] = <0, 0, 5>;
#declare pontos[2][1] = <5, 0, -5>;
#declare pontos[3][1] = <-5, 0, -5>;
#declare pontos[4][1] = <5, 0, 0>;
#declare pontos[5][1] = <-5, 0, 0>;

// Cena final


union{
    #declare i = 0;
    #while (i<nPontos)
        curva(pontos[i], pontos[mod(i+1, nPontos)])
        #declare i = i+1;
    #end
}



#include "camlight.inc"
#declare centro_cena = < 0.00, 0.00, 0.00 >;
#declare raio_cena = 15.0;
#declare dir_camera = < 7.00, 7.00, 7.00 >;
#declare dist_camera = 5*raio_cena;
#declare intens_luz = 1.20;
camlight(centro_cena, raio_cena, dir_camera, dist_camera , z, intens_luz)