<commit_before><!--
/*
 * Copyright 2017 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
-->
<!DOCTYPE html>
<html lang="en">
<head>
  <title>three.ar.js - Record At Camera</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, user-scalable=no,
  minimum-scale=1.0, maximum-scale=1.0">
  <style>
    body {
      font-family: monospace;
      margin: 0;
      overflow: hidden;
      position: fixed;
      width: 100%;
      height: 100vh;
      -webkit-user-select: none;
      user-select: none;
    }
    #info {
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translate(-50%, 0);
      margin: 1em;
      z-index: 10;
      display: block;
      line-height: 2em;
      text-align: center;
    }
    #info * {
      color: #fff;
    }
    .title {
      background-color: rgba(40, 40, 40, 0.4);
      padding: 0.4em 0.6em;
      border-radius: 0.1em;
    }
    .links {
      background-color: rgba(40, 40, 40, 0.6);
      padding: 0.4em 0.6em;
      border-radius: 0.1em;
    }
    #buttons {
      left: 50%;
      position: absolute;
      bottom: 35px;
      z-index: 11;
      transform: translate(-50%, 0);
      margin: 1em;
      display: block;
      width: 100%;
      line-height: 3em;
      text-align: center;
      font-size: 20px;
    }
    canvas {
      position: absolute;
      top: 0;
      left: 0;
    }
  </style>
</head>
<body>
<div id="info">
  <span class="title">Tap anywhere and hold to record audio.</span><br/>
  <span class="links">
    <a href="https://github.com/google-ar/three.ar.js">three.ar.js</a> -
    <a href="https://developers.google.com/ar/develop/web/getting-started#examples">examples</a>
  </span>
</div>
<div id="buttons">
  <button id="erase" onclick="deleteAudioElements()">Erase all recordings</button>
</div>
<script src="../third_party/three.js/three.js"></script>
<script src="../third_party/three.js/VRControls.js"></script>
<script src="../dist/three.ar.js"></script>
<script src="https://cdn.rawgit.com/google/songbird/master/build/songbird.min.js"></script>

<script>
var vrDisplay;
var vrFrameData;
var vrControls;
var arView;
var canvas;
var camera;
var scene;
var renderer;
var clone;
var shapes = [];

var audioContext = window.AudioContext ? new AudioContext() : null;

var AMBISONIC_ORDER = 3;
var SONGBIRD_OPTIONS = {
  ambisonicOrder: AMBISONIC_ORDER
};

var currentAudioElement;
var audioChunks = [];
var currentAudioElementPosition;
var currentAudioElementOrientation;

var audioElements = [];

var songbird;

var LEARN_MORE_LINK = 'https://developers.google.com/ar/develop/web/getting-started#examples';
var AUDIO_UNSUPPORTED_MESSAGE = `This augmented reality experience requires getUserMedia(),
    which is not supported on this browser. See other demos on the
    <a href="${LEARN_MORE_LINK}">Google Developers site</a>.`;

/**
 * Use the `getARDisplay()` utility to leverage the WebVR API
 * to see if there are any AR-capable WebVR VRDisplays. Returns
 * a valid display if found. Otherwise, display the unsupported
 * browser message.
 */
THREE.ARUtils.getARDisplay().then(function (display) {
  if (!audioContext) {
    THREE.ARUtils.displayUnsupportedMessage(AUDIO_UNSUPPORTED_MESSAGE);
  } else if (display) {
    vrFrameData = new VRFrameData();
    vrDisplay = display;
    init();
  } else {
    THREE.ARUtils.displayUnsupportedMessage();
  }
});

function init() {
  // Create a (2nd-order Ambisonic) Songbird scene.
  songbird = new Songbird(audioContext, SONGBIRD_OPTIONS);

  // Turn on the debugging panel
  var arDebug = new THREE.ARDebug(vrDisplay);
  document.body.appendChild(arDebug.getElement());

  // Setup the three.js rendering environment
  renderer = new THREE.WebGLRenderer({alpha: true});
  renderer.setPixelRatio(window.devicePixelRatio);
  console.log('setRenderer size', window.innerWidth, window.innerHeight);
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.autoClear = false;
  canvas = renderer.domElement;
  document.body.appendChild(canvas);
  scene = new THREE.Scene();

  // Creating the ARView, which is the object that handles
  // the rendering of the camera stream behind the three.js
  // scene
  arView = new THREE.ARView(vrDisplay, renderer);

  // The ARPerspectiveCamera is very similar to THREE.PerspectiveCamera,
  // except when using an AR-capable browser, the camera uses
  // the projection matrix provided from the device, so that the
  // perspective camera's depth planes and field of view matches
  // the physical camera on the device.
  camera = new THREE.ARPerspectiveCamera(
    vrDisplay,
    60,
    window.innerWidth / window.innerHeight,
    vrDisplay.depthNear,
    vrDisplay.depthFar
  );

  // VRControls is a utility from three.js that applies the device's
  // orientation/position to the perspective camera, keeping our
  // real world and virtual world in sync.
  vrControls = new THREE.VRControls(camera);

  // Create the geometry that we'll copy and place in the
  // scene when the user clicks the screen
  makeVisualRecordingObject();

  // Bind our event handlers
  window.addEventListener('resize', onWindowResize, false);
  canvas.addEventListener('touchstart', onTouchDown, false);
  canvas.addEventListener('touchend', onTouchUp, false);

  // Send songbird's binaural output to stereo out.
  songbird.output.connect(audioContext.destination);

  // Set up audio recording
  navigator.mediaDevices.getUserMedia({audio: true})
    .then(function (stream) {
      rec = new MediaRecorder(stream);
      rec.ondataavailable = function (audioData) {
        if (audioData.data.size > 0) {
          audioChunks.push(audioData.data);
        }
        if (rec.state == 'inactive') {
          console.log('about to create and play recording');
          var blob = new Blob(audioChunks);
          currentAudioElement.src = URL.createObjectURL(blob);
          currentAudioElement.loop = true;
          currentAudioElement.play();
        }
      }
    })
    .catch(function (e) {
      console.log(e)
    });

  // Kick off the render loop!
  update();
}

/**
 * The render loop, called once per frame. Handles updating
 * our scene and rendering.
 */
function update() {
  // Render the device's camera stream on screen
  arView.render();

  // Update our camera projection matrix in the event that
  // the near or far planes have updated
  camera.updateProjectionMatrix();

  // From the WebVR API, populate `vrFrameData` with
  // updated information for the frame
  vrDisplay.getFrameData(vrFrameData);

  // Update our perspective camera's positioning
  vrControls.update();

  // Render our three.js virtual scene
  renderer.clearDepth();
  renderer.render(scene, camera);

  // Update camera location for audio
  songbird.setListenerFromMatrix(camera.matrix);

  // Kick off the requestAnimationFrame to call this function
  // when a new VRDisplay frame is rendered
  vrDisplay.requestAnimationFrame(update);
}

/**
 * On window resize, update the perspective camera's aspect ratio,
 * and call `updateProjectionMatrix` so that we can get the latest
 * projection matrix provided from the device
 */
function onWindowResize() {
  console.log('setRenderer size', window.innerWidth, window.innerHeight);
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(window.innerWidth, window.innerHeight);
}

/**
 * When clicking on the screen, create a shape at the user's
 * current position and start recording.
 */
function onTouchDown() {
  audioChunks = [];
  rec.start();

  // Fetch the pose data from the current frame
  var pose = vrFrameData.pose;

  drawShape(pose.position, pose.orientation, 0xcc0000);
  createAudioElement(pose.position, pose.orientation);
}

/**
 * Draw shape to represent location of recorded audio.
 * @param position Position of shape
 * @param orientation Orientation of shape
 * @param shapeColor Color of shape
 */
function drawShape(position, orientation, shapeColor) {
  // Convert the pose orientation and position into
  // THREE.Quaternion and THREE.Vector3 respectively
  var ori = new THREE.Quaternion(
    orientation[0],
    orientation[1],
    orientation[2],
    orientation[3]
  );
  var pos = new THREE.Vector3(
    position[0],
    position[1],
    position[2]
  );
  var dirMtx = new THREE.Matrix4();
  dirMtx.makeRotationFromQuaternion(ori);

  var newShapeOffset = new THREE.Vector3(0, 0, -1.0);
  newShapeOffset.transformDirection(dirMtx);
  var SHAPE_OFFSET_SCALING = 0.02;
  pos.addScaledVector(newShapeOffset, SHAPE_OFFSET_SCALING);
  clone = group.clone();
  scene.add(clone);
  clone.position.copy(pos);
  clone.quaternion.copy(ori);
  for (var i = 0; i < clone.children.length; i++) {
    clone.children[i].material = new THREE.MeshBasicMaterial({color: shapeColor})
  }
  shapes.push(clone);
  clone.name = shapes.indexOf(clone);
}

function createAudioElement(position, orientation) {
  // Create an audio element. Feed into audio graph.
  currentAudioElement = document.createElement('audio');
  //currentAudioElement.loop = true;
  //currentAudioElement.autoplay = true;
  document.body.appendChild(currentAudioElement);
  audioElements.push(currentAudioElement);

  // Create an AudioNode from the audio element.
  var audioElementSource = audioContext.createMediaElementSource(currentAudioElement);

  // Create a Source, connect desired audio input to it.
  var SOURCE_OPTIONS = {
    minDistance: 0.1,
    maxDistance: 2,
    rolloff: 'logarithmic',
    alpha: 0,
    sharpness: 1,
    sourceWidth: 0,
    gain: 5
  };

  var source = songbird.createSource(SOURCE_OPTIONS);
  audioElementSource.connect(source.input);

  // The source position is relative to the origin.
  source.setPosition(position[0], position[1], position[2]);
  console.log('Position of audio source: ' +
    position[0] + ', ' + position[1] + ', ' + position[2]);
  currentAudioElementPosition = position;
  currentAudioElementOrientation = orientation;
}

/**
 * When touch ends, stop recording and change color of the cube for user feedback.
 */
function onTouchUp() {
  console.log('about to stop recording');
  rec.stop();
  for (var i = 0; i < clone.children.length; i++) {
    clone.children[i].material = new THREE.MeshBasicMaterial({color: 0xcccccc})
  }
}

/**
 * Remove all <audio> elements from the DOM, along with their displayed
 */
function deleteAudioElements() {
  for (var i = 0; i < audioElements.length; i++) {
    var audioElement = audioElements[i];
    audioElement.parentNode.removeChild(audioElement);
    console.log("remove audio element");
  }
  audioElements = [];

  for (var j = 0; j < shapes.length; j++) {
    var aShape = shapes[j];
    console.log("removing shape");
    scene.remove(scene.getObjectByName(aShape.name));
  }
  shapes = [];
}

/**
 * Create object to represent recording, a sphere described by random lines.
 */
function makeVisualRecordingObject() {
  group = new THREE.Object3D();
  group.name = 'group';
  var NUM_LINES = 200;
  var SIZE_LINE = .4;
  var SCALAR_MULTIPLY_FACTOR = .01;
  var VERTEX_2_VARIATION = .5;
  for (var i = 0; i < NUM_LINES; i++) {
    var geometry = new THREE.Geometry();
    var vertex = new THREE.Vector3(Math.random() * SIZE_LINE - SIZE_LINE / 2,
      Math.random() * SIZE_LINE - SIZE_LINE / 2, Math.random() * SIZE_LINE - SIZE_LINE / 2);
    vertex.normalize();
    vertex.multiplyScalar(SCALAR_MULTIPLY_FACTOR);
    geometry.vertices.push(vertex);
    var vertex2 = vertex.clone();
    vertex2.multiplyScalar(Math.random() * VERTEX_2_VARIATION + VERTEX_2_VARIATION * 2);
    geometry.vertices.push(vertex2);
    var line = new THREE.Line(geometry, new THREE.LineBasicMaterial({color: 0xff0000, opacity: 1}));
    group.add(line);
  }
}
</script>
</body>
</html>
<commit_msg>Updates Songbird git repo<commit_after><!--
/*
 * Copyright 2017 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
-->
<!DOCTYPE html>
<html lang="en">
<head>
  <title>three.ar.js - Record At Camera</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, user-scalable=no,
  minimum-scale=1.0, maximum-scale=1.0">
  <style>
    body {
      font-family: monospace;
      margin: 0;
      overflow: hidden;
      position: fixed;
      width: 100%;
      height: 100vh;
      -webkit-user-select: none;
      user-select: none;
    }
    #info {
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translate(-50%, 0);
      margin: 1em;
      z-index: 10;
      display: block;
      line-height: 2em;
      text-align: center;
    }
    #info * {
      color: #fff;
    }
    .title {
      background-color: rgba(40, 40, 40, 0.4);
      padding: 0.4em 0.6em;
      border-radius: 0.1em;
    }
    .links {
      background-color: rgba(40, 40, 40, 0.6);
      padding: 0.4em 0.6em;
      border-radius: 0.1em;
    }
    #buttons {
      left: 50%;
      position: absolute;
      bottom: 35px;
      z-index: 11;
      transform: translate(-50%, 0);
      margin: 1em;
      display: block;
      width: 100%;
      line-height: 3em;
      text-align: center;
      font-size: 20px;
    }
    canvas {
      position: absolute;
      top: 0;
      left: 0;
    }
  </style>
</head>
<body>
<div id="info">
  <span class="title">Tap anywhere and hold to record audio.</span><br/>
  <span class="links">
    <a href="https://github.com/google-ar/three.ar.js">three.ar.js</a> -
    <a href="https://developers.google.com/ar/develop/web/getting-started#examples">examples</a>
  </span>
</div>
<div id="buttons">
  <button id="erase" onclick="deleteAudioElements()">Erase all recordings</button>
</div>
<script src="../third_party/three.js/three.js"></script>
<script src="../third_party/three.js/VRControls.js"></script>
<script src="../dist/three.ar.js"></script>
<script src="https://cdn.jsdelivr.net/npm/songbird-audio/build/songbird.min.js"></script>

<script>
var vrDisplay;
var vrFrameData;
var vrControls;
var arView;
var canvas;
var camera;
var scene;
var renderer;
var clone;
var shapes = [];

var audioContext = window.AudioContext ? new AudioContext() : null;

var AMBISONIC_ORDER = 3;
var SONGBIRD_OPTIONS = {
  ambisonicOrder: AMBISONIC_ORDER
};

var currentAudioElement;
var audioChunks = [];
var currentAudioElementPosition;
var currentAudioElementOrientation;

var audioElements = [];

var songbird;

var LEARN_MORE_LINK = 'https://developers.google.com/ar/develop/web/getting-started#examples';
var AUDIO_UNSUPPORTED_MESSAGE = `This augmented reality experience requires getUserMedia(),
    which is not supported on this browser. See other demos on the
    <a href="${LEARN_MORE_LINK}">Google Developers site</a>.`;

/**
 * Use the `getARDisplay()` utility to leverage the WebVR API
 * to see if there are any AR-capable WebVR VRDisplays. Returns
 * a valid display if found. Otherwise, display the unsupported
 * browser message.
 */
THREE.ARUtils.getARDisplay().then(function (display) {
  if (!audioContext) {
    THREE.ARUtils.displayUnsupportedMessage(AUDIO_UNSUPPORTED_MESSAGE);
  } else if (display) {
    vrFrameData = new VRFrameData();
    vrDisplay = display;
    init();
  } else {
    THREE.ARUtils.displayUnsupportedMessage();
  }
});

function init() {
  // Create a (2nd-order Ambisonic) Songbird scene.
  songbird = new Songbird(audioContext, SONGBIRD_OPTIONS);

  // Turn on the debugging panel
  var arDebug = new THREE.ARDebug(vrDisplay);
  document.body.appendChild(arDebug.getElement());

  // Setup the three.js rendering environment
  renderer = new THREE.WebGLRenderer({alpha: true});
  renderer.setPixelRatio(window.devicePixelRatio);
  console.log('setRenderer size', window.innerWidth, window.innerHeight);
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.autoClear = false;
  canvas = renderer.domElement;
  document.body.appendChild(canvas);
  scene = new THREE.Scene();

  // Creating the ARView, which is the object that handles
  // the rendering of the camera stream behind the three.js
  // scene
  arView = new THREE.ARView(vrDisplay, renderer);

  // The ARPerspectiveCamera is very similar to THREE.PerspectiveCamera,
  // except when using an AR-capable browser, the camera uses
  // the projection matrix provided from the device, so that the
  // perspective camera's depth planes and field of view matches
  // the physical camera on the device.
  camera = new THREE.ARPerspectiveCamera(
    vrDisplay,
    60,
    window.innerWidth / window.innerHeight,
    vrDisplay.depthNear,
    vrDisplay.depthFar
  );

  // VRControls is a utility from three.js that applies the device's
  // orientation/position to the perspective camera, keeping our
  // real world and virtual world in sync.
  vrControls = new THREE.VRControls(camera);

  // Create the geometry that we'll copy and place in the
  // scene when the user clicks the screen
  makeVisualRecordingObject();

  // Bind our event handlers
  window.addEventListener('resize', onWindowResize, false);
  canvas.addEventListener('touchstart', onTouchDown, false);
  canvas.addEventListener('touchend', onTouchUp, false);

  // Send songbird's binaural output to stereo out.
  songbird.output.connect(audioContext.destination);

  // Set up audio recording
  navigator.mediaDevices.getUserMedia({audio: true})
    .then(function (stream) {
      rec = new MediaRecorder(stream);
      rec.ondataavailable = function (audioData) {
        if (audioData.data.size > 0) {
          audioChunks.push(audioData.data);
        }
        if (rec.state == 'inactive') {
          console.log('about to create and play recording');
          var blob = new Blob(audioChunks);
          currentAudioElement.src = URL.createObjectURL(blob);
          currentAudioElement.loop = true;
          currentAudioElement.play();
        }
      }
    })
    .catch(function (e) {
      console.log(e)
    });

  // Kick off the render loop!
  update();
}

/**
 * The render loop, called once per frame. Handles updating
 * our scene and rendering.
 */
function update() {
  // Render the device's camera stream on screen
  arView.render();

  // Update our camera projection matrix in the event that
  // the near or far planes have updated
  camera.updateProjectionMatrix();

  // From the WebVR API, populate `vrFrameData` with
  // updated information for the frame
  vrDisplay.getFrameData(vrFrameData);

  // Update our perspective camera's positioning
  vrControls.update();

  // Render our three.js virtual scene
  renderer.clearDepth();
  renderer.render(scene, camera);

  // Update camera location for audio
  songbird.setListenerFromMatrix(camera.matrix);

  // Kick off the requestAnimationFrame to call this function
  // when a new VRDisplay frame is rendered
  vrDisplay.requestAnimationFrame(update);
}

/**
 * On window resize, update the perspective camera's aspect ratio,
 * and call `updateProjectionMatrix` so that we can get the latest
 * projection matrix provided from the device
 */
function onWindowResize() {
  console.log('setRenderer size', window.innerWidth, window.innerHeight);
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(window.innerWidth, window.innerHeight);
}

/**
 * When clicking on the screen, create a shape at the user's
 * current position and start recording.
 */
function onTouchDown() {
  audioChunks = [];
  rec.start();

  // Fetch the pose data from the current frame
  var pose = vrFrameData.pose;

  drawShape(pose.position, pose.orientation, 0xcc0000);
  createAudioElement(pose.position, pose.orientation);
}

/**
 * Draw shape to represent location of recorded audio.
 * @param position Position of shape
 * @param orientation Orientation of shape
 * @param shapeColor Color of shape
 */
function drawShape(position, orientation, shapeColor) {
  // Convert the pose orientation and position into
  // THREE.Quaternion and THREE.Vector3 respectively
  var ori = new THREE.Quaternion(
    orientation[0],
    orientation[1],
    orientation[2],
    orientation[3]
  );
  var pos = new THREE.Vector3(
    position[0],
    position[1],
    position[2]
  );
  var dirMtx = new THREE.Matrix4();
  dirMtx.makeRotationFromQuaternion(ori);

  var newShapeOffset = new THREE.Vector3(0, 0, -1.0);
  newShapeOffset.transformDirection(dirMtx);
  var SHAPE_OFFSET_SCALING = 0.02;
  pos.addScaledVector(newShapeOffset, SHAPE_OFFSET_SCALING);
  clone = group.clone();
  scene.add(clone);
  clone.position.copy(pos);
  clone.quaternion.copy(ori);
  for (var i = 0; i < clone.children.length; i++) {
    clone.children[i].material = new THREE.MeshBasicMaterial({color: shapeColor})
  }
  shapes.push(clone);
  clone.name = shapes.indexOf(clone);
}

function createAudioElement(position, orientation) {
  // Create an audio element. Feed into audio graph.
  currentAudioElement = document.createElement('audio');
  //currentAudioElement.loop = true;
  //currentAudioElement.autoplay = true;
  document.body.appendChild(currentAudioElement);
  audioElements.push(currentAudioElement);

  // Create an AudioNode from the audio element.
  var audioElementSource = audioContext.createMediaElementSource(currentAudioElement);

  // Create a Source, connect desired audio input to it.
  var SOURCE_OPTIONS = {
    minDistance: 0.1,
    maxDistance: 2,
    rolloff: 'logarithmic',
    alpha: 0,
    sharpness: 1,
    sourceWidth: 0,
    gain: 5
  };

  var source = songbird.createSource(SOURCE_OPTIONS);
  audioElementSource.connect(source.input);

  // The source position is relative to the origin.
  source.setPosition(position[0], position[1], position[2]);
  console.log('Position of audio source: ' +
    position[0] + ', ' + position[1] + ', ' + position[2]);
  currentAudioElementPosition = position;
  currentAudioElementOrientation = orientation;
}

/**
 * When touch ends, stop recording and change color of the cube for user feedback.
 */
function onTouchUp() {
  console.log('about to stop recording');
  rec.stop();
  for (var i = 0; i < clone.children.length; i++) {
    clone.children[i].material = new THREE.MeshBasicMaterial({color: 0xcccccc})
  }
}

/**
 * Remove all <audio> elements from the DOM, along with their displayed
 */
function deleteAudioElements() {
  for (var i = 0; i < audioElements.length; i++) {
    var audioElement = audioElements[i];
    audioElement.parentNode.removeChild(audioElement);
    console.log("remove audio element");
  }
  audioElements = [];

  for (var j = 0; j < shapes.length; j++) {
    var aShape = shapes[j];
    console.log("removing shape");
    scene.remove(scene.getObjectByName(aShape.name));
  }
  shapes = [];
}

/**
 * Create object to represent recording, a sphere described by random lines.
 */
function makeVisualRecordingObject() {
  group = new THREE.Object3D();
  group.name = 'group';
  var NUM_LINES = 200;
  var SIZE_LINE = .4;
  var SCALAR_MULTIPLY_FACTOR = .01;
  var VERTEX_2_VARIATION = .5;
  for (var i = 0; i < NUM_LINES; i++) {
    var geometry = new THREE.Geometry();
    var vertex = new THREE.Vector3(Math.random() * SIZE_LINE - SIZE_LINE / 2,
      Math.random() * SIZE_LINE - SIZE_LINE / 2, Math.random() * SIZE_LINE - SIZE_LINE / 2);
    vertex.normalize();
    vertex.multiplyScalar(SCALAR_MULTIPLY_FACTOR);
    geometry.vertices.push(vertex);
    var vertex2 = vertex.clone();
    vertex2.multiplyScalar(Math.random() * VERTEX_2_VARIATION + VERTEX_2_VARIATION * 2);
    geometry.vertices.push(vertex2);
    var line = new THREE.Line(geometry, new THREE.LineBasicMaterial({color: 0xff0000, opacity: 1}));
    group.add(line);
  }
}
</script>
</body>
</html>

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