// Exemplo de arquivo de descricao de cena para POV-ray
// Last edited on 2010-03-04 15:44:01 by stolfi

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

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

#declare tx_plastico = 
  texture{
    pigment{ color rgb < 0.60, 0.30, 0.20 > }
    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
  }

// ======================================================================
// 
#declare r_t = 0.55;
#macro moeda(bx,by,bz)

cylinder {
	<bx,by,bz>,<bx,by,bz+0.05>
	0.4
				texture{tx_fosca}
}

#end

#declare l_galho = 2;
#macro galho(bx,by,bz,r_i,r_f)
	cone {
		<bx,by,bz>, r_i
		<bx,by,bz+l_galho>, r_f
	}
#end

#macro arvore(n,bx,by,bz,r)
	#declare aor = 45;
	#if (n = 0)
		union {
			union {
			object{
				galho(bx,by,bz,r,0) 
				translate <0,-by,-bz>
				rotate <aor,0,0>
				translate <0,by,bz>
			}
			object{
				moeda(bx,by,bz+l_galho)
				translate <0,-by,-bz>
				rotate <aor,0,0>
				translate <0,by,bz>
			}
			}
			union{
			object{
				galho(bx,by,bz,r,0) 
				translate <0,-by,-bz>
				rotate <-aor,0,0>
				translate <0,by,bz>
			}
			object{
				moeda(bx,by,bz+l_galho)
				translate <0,-by,-bz>
				rotate <-aor,0,0>
				translate <0,by,bz>
			}
			}
			
		} 
	#else
		#declare raor = sin((180*aor)/pi);
		#declare raor2 = cos((180*aor)/pi);
		#declare ny = l_galho*raor2;
		#declare rf = r;
		union{
			object{
				galho(bx,by,bz,r,r-0.12)
				translate <0,-by,-bz>
				rotate <aor,0,0>
				translate <0,by,bz>
			}
			object{
				galho(bx,by,bz,r,r-0.12) 
				translate <0,-by,-bz>
				rotate <-aor,0,0>
				translate <0,by,bz>
			}
			union {
				object{arvore(n-1,bx,by+ny+2.75,(bz)+l_galho*raor-0.15,
				r-0.12) }
			}
			union {
				object{arvore(n-1,bx,by-ny-2.75,(bz)+l_galho*raor-0.15,
				r-0.12)}
			}
		}
	#end
#end

#declare tronco =
cone	{
	<0,0,-8>,r_t+0.34
	<0,0,-4>,
	r_t
}
// DESCRIÇÃO DA CENA 
// Partes da cena:

union {
	object{tronco texture{tx_plastico}}
	object{arvore(2,0,0,-4,r_t) texture{tx_plastico}}
}
  
#include "eixos.inc"

// Aqui está a cena, finalmente:


#include "camlight.inc"
#declare centro_cena = < 0.00, 0.00, 1.00 >;
#declare raio_cena = 20;
#declare dir_camera = < 14.00, 7.00, 4.00 >;
#declare dist_camera = 16.0;
#declare intens_luz = 1.00;
camlight(centro_cena, raio_cena, dir_camera, dist_camera , z, intens_luz)