// 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_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 < 0.10, 0.32, 0.60 >, color rgb < 1.00, 0.97, 0.90 > }
    finish{ diffuse 0.9 ambient 0.1 }
    scale 2.0
  }

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

// Partes da cena:

#declare cx = 0;
#declare cz = 0;
#declare cy = 0;

//Acredito que sera mais facil utilizar funcoes seno e cosseno para fazer o circulo. 
//Preciso fazer isso antes da proxima aula.

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

   #local ABCD = interpolaLin(t0,ABC,t1,BCD,tt);
   ABCD
#end

#macro c (P, R) 
  #declare cy = sqrt(pow(R, 2) - pow(cx, 2));
  #declare cz = 0;
#end

//0,0,0 200,0,0  

#macro poligono (N)
   #local ini = <0.0, 0.0, 0.0>;
   #local tt = 0;
   #local ii = 1/N;
   
   #local AD = <0,0,0>;
   
   #local A2 = <100,200,0>;
   #local A3 = <300,-200,0>;

   #local AB = <400,0,0>;
   
   #local B2 = <500,200,0>;
   #local B3 = <300,200,0>;
   
   #local BC = <400,400,0>;

   #local C2 = <500,600,0>;
   #local C3 = <150,300,0>;
   
   #local CD = <000,400,0>;
   
   #local D2 = <-150,500,0>;
   #local D3 = <-100,-200,0>;
   
   #while (tt < 1)
      //object {sphere {interpolaLin(0.00, <000,000,000>, 0.80, <200,000,000>, tt), 20.00 texture{tx_fosca}}}
      //object {sphere {interpolaLin(0.00, <200,000,000>, 0.80, <200,200,000>, tt), 20.00 texture{tx_fosca}}}
      object {sphere {arcobezier(0.0, 1.0, AD, A2, A3, AB,tt), 20.00 texture{tx_fosca}}}
      object {sphere {arcobezier(0.0, 1.0, AB, B2, B3, BC,tt), 20.00 texture{tx_fosca}}}
      object {sphere {arcobezier(0.0, 1.0, BC, C2, C3, CD,tt), 20.00 texture{tx_fosca}}}
      object {sphere {arcobezier(0.0, 1.0, CD, D2, D3, AD,tt), 20.00 texture{tx_fosca}}}
      #local tt = tt + ii;
   #end
#end

poligono(1000)

#macro circulo (R, N)
  #declare centro = <0.0, 0.0, 0.0>;
  #declare nX = N/2;
  #declare d = 2*R/nX;
  #declare cx = -R;
  #while (cx<R) 
     c(cx, R)
     object {sphere {<cx, cy, cz>, 20.00 texture{tx_fosca}}}
     object {sphere {<cx, -cy, cz>, 20.00 texture{tx_fosca}}}
     #declare cx = cx + d;
  #end
#end

// tive algum problema na etapa3 que ainda nao sei qual e
/*
#macro etapa3(N)
  #declare tt = 0;
  #declare i = 0.125;
  #declare np = N/8;
  #declare cx = 0.0;
  #declare cy = 0.0;
  #declare cz = 0.0;
  #while(tt < 1)
     #if (tt=0.00)
         #declare aux = 0; 
         #while(aux < np)
            object {sphere {<cx,cy,cz>, 20.00 texture{tx_fosca}}}
            #declare cx = cx + 5;
            #declare np = np +1;
         #end
     #end
     #if (tt=1.25)
         #aux = cx;
         #while(cx < aux+100)
            c(cx, 100)
            object {sphere {<cx,cy,cz>, 20.00 texture{tx_fosca}}}
            #declare cx = cx +100/np;
         #end
     #end
     #declare tt = tt + i;
  #end
#end

etapa3(400)
*/ 


//circulo (300, 1000)

#include "camlight.inc"
#declare centro_cena = < 0.00, 0.00, 1.00 >;
#declare raio_cena = 850;
#declare dir_camera = < 10.00, 10.00, 10.00 >;
#declare dist_camera = 5*raio_cena;
#declare intens_luz = 1.20;
camlight(centro_cena, raio_cena, dir_camera, dist_camera , z, intens_luz)