過場

by 蔡 育曄

HTML

<div id="info">Orientation 3D
  <br>spiral curve</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/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, light, controls;
var car;
var sign = 1, alpha = 0;
var pos1, pos2, quat1, quat2;

init();
animate();

function buildCar() {
	var car = new THREE.Object3D();
  var material = new THREE.MeshNormalMaterial();
  var carMesh = new THREE.Mesh(new THREE.CylinderGeometry(10,10,4,64), material);
  carMesh.position.y = 2;
	car.add(carMesh);
  var carMesh2 = new THREE.Mesh(new THREE.BoxGeometry(10,4,4), material);
  carMesh2.position.set(14,2,0);
  car.add(carMesh2);
  return car;

}

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

  camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1000);
  camera.position.z = 500;

  var gridXZ = new THREE.GridHelper(200, 20, 'red', 'white');
  scene.add(gridXZ);

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

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

  document.body.appendChild(renderer.domElement);
  window.addEventListener('resize', onWindowResize, false);


  car = buildCar();
  scene.add (car);
  
  var wall = new THREE.Mesh(new THREE.PlaneGeometry(200, 200, 140, 140), new  THREE.MeshBasicMaterial({ color: 0x42f4cb, side:THREE.DoubleSide}));
  wall.position.set(100,100,0);
  wall.rotation.y = Math.PI/2;
  scene.add(wall);
  

  quat1 = new THREE.Quaternion();
  quat1.setFromRotationMatrix (car.matrix);

	/*var localX = new THREE.Vector3(1,1,0).normalize();
  var localY = new THREE.Vector3(0,1,0);
  localY.sub(localY.clone().projectOnVector(localX)).normalize();
  var localZ = new THREE.Vector3();
  localZ.crossVectors (localX, localY);

  car.matrix.makeBasis (localX, localY, localZ);
  car.matrixAutoUpdate = false;

  quat2 = new THREE.Quaternion();
  quat2.setFromRotationMatrix(car.matrix);*/
  
  var oldDir = new THREE.Vector3(1,0,0);
  var newDir = new THREE.Vector3(0,1,0);
  var localDir = new THREE.Vector3(1,0,0);
  
  quat1 = new THREE.Quaternion();
 ...