#include "eixos.inc"
#include "camlight.inc"


// ======================================================================
// 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_galho =
	pigment {
		wood
		turbulence 0.05
		scale <0.2, 0.2, 1>
		color_map {
			[0.1 rgb <0.42, 0.26, 0.15>]
			[0.9 rgb <0.52, 0.37, 0.26>]
		}
	}

#declare tx_fosca = 
  texture{
    pigment{ color rgb < 1.00, 0.80, 0.10 > }
    finish{ diffuse 0.9 ambient 0.1 }
  }

#declare tx_verde = 
  texture{
    pigment{ color rgb <0,1,0>} 
     finish{ diffuse 0.9 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 

#macro arvore(yi, zi, yf, zf, n, raio, tamanho)
	#if (n = 0)
	union{  
	  box{ <0,yf-0.05,zf>, <0,yf+0.05,zf+0.2>
		texture{ tx_verde }
	  }
	  cylinder{
	    		< 0, yi, zi >,
			< 0, yf, zf >,
			0.2*raio
			texture{ tx_galho }
		}
	}
	#else
	union {
		cylinder{
	    		< 0, yi, zi >,
			< 0, yf, zf >,
			0.2*raio
			texture{ tx_galho }
		}

	object{ arvore(yf, zf, yf-tamanho*(0.866), zf+tamanho*(0.5), n-1,raio/2,tamanho/2) }
	object{ arvore(yf, zf, yf, zf+tamanho*(1), n-1,raio/2,tamanho/2) }
	object{ arvore(yf, zf, yf+tamanho*(0.866), zf+tamanho*(0.5), n-1,raio/2,tamanho/2) }
	}
	#end
#end	

// Aqui está a cena, finalmente:
object{arvore(0,0,0,2,3,1,1)}

#include "camlight.inc"
#declare centro_cena = < 0.00, 0.00, 0.00 >;
#declare raio_cena = 6.0;
#declare dir_camera = < 7.00, 1.00, 7.00 >;
#declare dist_camera = 16.0;
#declare intens_luz = 3.00;
camlight(centro_cena, raio_cena, dir_camera, dist_camera , z, intens_luz)