steer

part1

by joe chan

HTML

<div id="info">steer</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>
<script src="https://dl.dropboxusercontent.com/u/3587259/Code/Threejs/OrbitControls.js">


</script>
<script src="https://jyunming-chen.github.io/tutsplus/js/KeyboardState.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 cylinder;
var puck;

var raycaster;
var mouse = new THREE.Vector2();
var pickables = [];

var pos, vel, force;
var angle = 0;

// steer related
var target = new THREE.Vector3 ();
var maxSpeed = 40;
var maxForce = 40;

//var power;
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, 1000);
  camera.position.z = 300;
  scene.add(camera);

  // add my cylinder
  var geometry = new THREE.BoxGeometry(15, 2, 5);
  var material = new THREE.MeshNormalMaterial();
  cylinder = new THREE.Mesh(geometry, material);
  scene.add(cylinder);

  var gridXZ = new THREE.GridHelper(100, 10);
  gridXZ.setColors(new THREE.Color(0xff0000), new THREE.Color(0xffffff));
  scene.add(gridXZ);
  
  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(10,0,0);
  force = new THREE.Vector3();
  
  document.body.appendChild(renderer.domElement);
  /////////////////////////////////////////////////////////////////////
	plane = new THREE.Mesh (new THREE.PlaneGeometry(200,200), new THREE.MeshBasicMaterial({visible:false}));
  scene.add (plane);
  plane.rotation.x = -Math.PI/2;
	pickables = [plane];

	puck = new THREE.Mesh (new THREE.CylinderGeometry (5,5,2,20), new THREE.MeshNormalMaterial());
  scene.add (puck);

  raycaster = new THREE.Raycaster();
  document.addEventListener('mousedown', onDocumentMouseDown, false);
}

function onDocumentMouseDown(event) {
  event.preventDefault();
  mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
  mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;

  // find intersections
  raycaster.setFromCamera(mouse, camera);
  var intersects =...