Drive

by joe chan

HTML

<div id="info">4
  <br>Press Home to Start ; Space to Stop
  <br>Press Up / Down to Accel or decelerate
  <br>Press Right / Left to decide its direction</div>
<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/84/three.min.js"></script>
<script src="https://jyunming-chen.github.io/tutsplus/js/KeyboardState.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>

CSS

#info {
  position: absolute;
  top: 0px;
  width: 100%;
  padding: 10px;
  text-align: center;
  color: #ffff00
}

body {
  overflow: hidden;
}

JavaScript

var camera, scene, renderer, controls;
var keyboard = new KeyboardState();
var car;
var stop = true, direction = 0;

var pos, vel, force;
var angle = 0, pow = 30;
var mass = 1;
var clock = new THREE.Clock();

init();
animate();

function init() {
  scene = new THREE.Scene();

  camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 100000);
  camera.position.y = 200;
  camera.position.z = 300;
  scene.add(camera);

  geometry = new THREE.Geometry();
  geometry.vertices.push(
    new THREE.Vector3(0, 0, -4),
    new THREE.Vector3(0, 0, 4),
    new THREE.Vector3(10.14, 0, 0),
    new THREE.Vector3(0, 4, 0)
  );
  geometry.faces.push(
    new THREE.Face3(3, 1, 2),
    new THREE.Face3(3, 2, 0),
    new THREE.Face3(3, 0, 1),
    new THREE.Face3(1, 0, 2)
  );
  geometry.computeBoundingSphere();
  geometry.computeFaceNormals();
  geometry.computeVertexNormals();

  car = new THREE.Mesh(geometry, new THREE.MeshNormalMaterial({
    side: THREE.DoubleSide
  }));
  scene.add(car);

 
  var grid = new THREE.GridHelper(200, 20, 'red', 'white');

  scene.add(grid);

  renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.setClearColor(0x888888);

  controls = new THREE.OrbitControls(camera, renderer.domElement);

  pos = new THREE.Vector3();
  vel = new THREE.Vector3();
  force = new THREE.Vector3();

  document.body.appendChild(renderer.domElement);
}


function computeForce() {
  // engine force
  if (stop) {
    force = new THREE.Vector3(0, 0, 0);
    pow = 25;
  } else {
    force = new THREE.Vector3(1, 0, 0).applyAxisAngle(new THREE.Vector3(0, 1, 0), angle + direction).multiplyScalar(pow);
  }
  // resistance force 
  var alpha = 2.00;
  force.add(vel.clone().multiplyScalar(-alpha));
}

function animate() {
  keyboard.update();

   if (keyboard.down("home")) {
    stop = false;
  }
  if (keyboard.down("space")) {
    stop = true;
  }
  if (keyboard.pressed("w") || keyboard.pressed("W")) {
 ...