processing4/java/examples/OpenGL/Transform/Birds/Birds.pde

/**
 * Crazy Flocking 3D Birds 
 * by Ira Greenberg. 
 * 
 * Simulates a flock of birds using a Bird class and nested
 * pushMatrix() / popMatrix() functions. 
 * Trigonometry functions handle the flapping and sinuous movement.
 */

// Flock array
int birdCount = 200;
Bird[]birds = new Bird[birdCount];
float[]x = new float[birdCount];
float[]y = new float[birdCount];
float[]z = new float[birdCount];
float[]rx = new float[birdCount];
float[]ry = new float[birdCount];
float[]rz = new float[birdCount];
float[]spd = new float[birdCount];
float[]rot = new float[birdCount];

void setup() {
  size(640, 360, P3D);
  noStroke();

  // Initialize arrays with random values
  for (int i = 0; i < birdCount; i++){
    birds[i] = new Bird(random(-300, 300), random(-300, 300), 
               random(-500, -2500), random(5, 30), random(5, 30)); 

    x[i] = random(20, 340);
    y[i] = random(30, 350);
    z[i] = random(1000, 4800);
    rx[i] = random(-160, 160);
    ry[i] = random(-55, 55);
    rz[i] = random(-20, 20);
    spd[i] = random(.1, 3.75);
    rot[i] = random(.025, .15);
  }
}

void draw() {
  background(0);
  lights();
  for (int i = 0; i < birdCount; i++){
    birds[i].setFlight(x[i], y[i], z[i], rx[i], ry[i], rz[i]);
    birds[i].setWingSpeed(spd[i]);
    birds[i].setRotSpeed(rot[i]);
    birds[i].fly();
  }
}