THREE.SectionHelper

by wilt

HTML

<script src="https://rawgit.com/mrdoob/three.js/master/build/three.js"></script>
<script src="https://rawgit.com/mrdoob/three.js/master/examples/js/controls/OrbitControls.js"></script>
<script src="https://rawgit.com/Wilt/three.js/dev-sectionhelper/src/extras/helpers/SectionHelper.js"></script>

CSS

body {
  background-color: #000;
  margin: 0px;
  overflow: hidden;
}

JavaScript

// three.js info box follows shape
var renderer, scene, camera;
var angle = 0;

init();
animate();

function init() {
  // info
  var info = document.createElement('div');
  info.style.position = 'absolute';
  info.style.top = '30px';
  info.style.width = '100%';
  info.style.textAlign = 'center';
  info.style.color = '#fff';
  info.style.fontWeight = 'bold';
  info.style.backgroundColor = 'transparent';
  info.style.zIndex = '1';
  info.style.fontFamily = 'Monospace';
  info.innerHTML = "three.js - THREE.SectionHelper demo";
  document.body.appendChild(info);

  // renderer
  renderer = new THREE.WebGLRenderer({
    antialias: true
  });
  renderer.setPixelRatio(window.devicePixelRatio);
  renderer.setSize(window.innerWidth, window.innerHeight);
  document.body.appendChild(renderer.domElement);

  // scene
  scene = new THREE.Scene();

  // ambient light
  var ambient = new THREE.AmbientLight(0x404040);
  scene.add(ambient);

  // directional light
  var directionalLight = new THREE.DirectionalLight(0xffffff, 0.5);
  directionalLight.position.set(-1, -1, 1);
  scene.add(directionalLight);

  // camera
  camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 500);
  camera.position.set(100, -100, 50);
  camera.up.set(0, 0, 1);

  // controls
  controls = new THREE.OrbitControls(camera, renderer.domElement);
  controls.target = new THREE.Vector3(0, 0, 0);

  // material
  var material = new THREE.MeshPhongMaterial({
    color: 0xff0000,
    shading: THREE.FlatShading
  });

  // geometry
  var geometry = new THREE.BoxGeometry(50, 50, 50);

  // mesh
  var mesh = new THREE.Mesh(geometry, material);

  scene.add(mesh);

  // wireframe helper
  wireframeHelper = new THREE.WireframeHelper(mesh, 0xffffff);
  scene.add(wireframeHelper);
 
  // section helper
  var sectionHelper = new THREE.SectionHelper( mesh, 0xffffff );
  scene.add(sectionHelper);
  
  addClippingPlane();
}

// add clipping planes
function addClippingPlane() {
  var normal...