minimal three.js

with orbitControls, XZgrid, info

by jason870509

HTML

<div id="info">minimal three.js</div>
<script src="https://threejs.org/build/three.min.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;
var pickables = [];
var raycaster = new THREE.Raycaster();
var mouse = new THREE.Vector2();
var light;

var lit = false;

init();
animate();

function init() {

  scene = new THREE.Scene();

  renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);
 // renderer.setClearColor(0x888888);
  document.body.appendChild(renderer.domElement);

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

  ////////////////////////////////////////////////////////////////
  var gridXZ = new THREE.GridHelper(200, 20, 'red', 'white');
  //scene.add(gridXZ);
 light = new THREE.PointLight( 0xffffff, 1 );
light.position.set( 50, 50, 50 );
scene.add( light );

  myswitch = new THREE.Group();
  casing = new THREE.Mesh(new THREE.CylinderGeometry(15, 15, 10, 20), new THREE.MeshPhongMaterial())
  core = new THREE.Mesh(new THREE.CylinderGeometry(10, 10, 12, 20), new THREE.MeshPhongMaterial({
    //color: 'red'
  }))
  myswitch.add(casing, core);
  scene.add(myswitch);
  casing.position.y = 5;
  core.position.y = 6;
  pickables = [core]

  document.addEventListener('mousedown', onDocumentMouseDown, false)
}

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

  // find intersections
  raycaster.setFromCamera(mouse, camera);
  var intersects = raycaster.intersectObjects(pickables, false);
  if (intersects.length > 0) {
    lit = !lit; // toggle;
    if (lit) {
      core.material.emissive = new THREE.Color(0x030303);
      light.intensity = 1;
    } else {
      core.material.emissive = new THREE.Color('red');
      light.intensity = 0;
    }
  } else {
    console.log('no hit')
  }

}

function animate() {

  requestAnimationFrame(animate);
  render();

}

function render() {

 ...