/**
A 3d Wood - The day 22 door for my 2010 Advent calendar
<br>
by <a href="http://www.local-guru.net/blog/">Guru</a>
*/

void setup() {
  size(300,300,P3D);
}
float a = 0;
void draw() {
  a += 0.01;
  background(0);
  camera( 400,100,800,0,100,0,0,1,0 );
  lights();
  rotateY( a );

  translate( width/2,height/2);
  for ( int x = - 10; x < 10; x++ ) {
    for( int y = -10; y < 10; y++ ) {
      pushMatrix();
      translate( x * 60, 0 ,y * 60);
      tree();
      popMatrix();
    }
  }
}

void tree() {
  fill(0,255,0);
  noStroke();
  beginShape( TRIANGLE_FAN );
  vertex( 0,-100,0);
  for( int i = 0; i < 36; i++) {
    vertex( cos( radians( i * 40 )) * 30, -10, sin( radians(i * 40)) * 20);
  }
  endShape(CLOSE );
  fill( 200, 128, 0 );
  beginShape(QUAD_STRIP);
  for( int i = 0; i < 36; i++) {
    vertex( cos( radians( i * 40 )) * 5, -10, sin( radians(i * 40)) * 5);
    vertex( cos( radians( i * 40 )) * 5, 0, sin( radians(i * 40)) * 5);
  }
  endShape();
}