If a boid fly too high or too low, a force is applied to make it go to the average depth

    - So that they tend to fly horizontally

  There is also a quad tree to minimize the cost distance calculation

*/

​

let maxForce = 0.1;

let maxSpeed = 5;

let perception = 150;

​

const flock = []; // Array of boids

let depth = 800; // The Z location of the boid tend to stay between +depth/2 and -depth/2

let gap = 300; // Boids can go further than the edges, this further distance is the gap

let quadTree; // A quad tree to minimize the cost of distance calculation

let unitX, unitY, unitZ; // Unit vectors pointing in the X, Y, and Z directions

​

let useQuadTree = true; // Toogle the use of a quad tree

​

let boidsP, perceptionP, alignmentP, cohesionP, separationP; // Paragraphs

let startingBoids = 200; // Amount of boid at the start of the sketch

let startingPerception = 90; // Perception radius at the start of the sketch

​

// SETUP FUNCTION ---------------------------------------------------

// Make the canvas, declare some variables, create the DOM elements and the initial boid population

function setup() {

  // Declaration of a canvas to allow canvas download

  let p5Canvas;

​

  p5Canvas = createCanvas(800, 800, WEBGL); // You can change the resolution here

​

  // Declaration of depth (z axis), unit vectors, and the camera

  depth = height;

  unitX = createVector(1, 0, 0);

  unitY = createVector(0, 1, 0);

  unitZ = createVector(0, 0, 1);

  let cameraX = 630 / 600 * width;

  let cameraY = 140 / 500 * height;

  let cameraZ = -280 / 500 * depth;

​

​

​

  // Create an initial population of 100 boids

  for (let i = 0; i < startingBoids; i++) {

    pushRandomBoid();

  }

}

​

// DRAW FUNCTION ---------------------------------------------------

function draw() {

  orbitControl();

  // Background and lightning

  background(255);

  // Draw the corners of a box showing the space where boids can fly

  stroke(80);

  strokeWeight(8);

  noFill();

  box(width + gap/2, height + gap/2, depth + gap/2);

​

  // Make the quad tree

  let boundary = new Cube(0, 0, 0, width + 2 * gap, height + 2 * gap, depth + 2 * gap);

  quadTree = new QuadTree(boundary, 4);

  for (let boid of flock) {

    quadTree.insert(boid);

  }

  // Each boid determines its acceleration for the next frame

  for (let boid of flock) {

    boid.flock(flock, quadTree);

  }

  // Each boid updates its position and velocity, and is displayed on screen

  for (let boid of flock) {

    boid.update(gap);

    boid.show();

  }

​

}

// Make a new boid

function pushRandomBoid() {

  let pos = createVector(random(width), random(height), random(-depth/2, depth/2)); // Uncomment and comment next line to create boids at random position

  let vel = p5.Vector.random3D().mult(random(0.5, 3)); // Give a random velocity

  let boid = new Boid(pos, vel); // Create a new boid

  flock.push(boid); // Add the new boid to the flock

}

​