From 04b05d0e99d1787df265f0a962fcea684aaa7702 Mon Sep 17 00:00:00 2001
From: Austin Jackson <austinjckson@gmail.com>
Date: Fri, 5 Oct 2018 15:21:49 -0500
Subject: [PATCH] account for pixel ratio

---
 dist/model-element.js     | 1 +
 dist/model-element.js.map | 2 +-
 dist/model-element.min.js | 2 +-
 src/modelLayer.js         | 1 +
 4 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/dist/model-element.js b/dist/model-element.js
index 0f0d4a9..544c7a1 100644
--- a/dist/model-element.js
+++ b/dist/model-element.js
@@ -334,6 +334,7 @@
       alpha: true
     });
 
+    renderer.setPixelRatio(window.devicePixelRatio);
     renderer.setScissorTest(true);
     renderer.setClearColor(0x000000, 0);
     renderer.autoClear = false;
diff --git a/dist/model-element.js.map b/dist/model-element.js.map
index 421036b..2e3cff9 100644
--- a/dist/model-element.js.map
+++ b/dist/model-element.js.map
@@ -1 +1 @@
-{"version":3,"file":"model-element.js","sources":["../src/utils/model.js","../src/utils/url.js","../src/modelLoader.js","../src/utils/css.js","../src/utils/dom.js","../src/modelLayer.js","../src/modelElement.js","../src/loaders/gltf.js","../src/loaders/obj.js","../src/index.js"],"sourcesContent":["\nconst normalize = obj => {\n  let box = new THREE.Box3().setFromObject(obj);\n  let size = new THREE.Vector3();\n  box.getCenter(obj.position);\n  box.getSize(size);\n\n  let scale = 1 / Math.max(size.x, size.y);\n  obj.position.multiplyScalar(-scale);\n  obj.scale.multiplyScalar(scale);\n  obj.userData.size = size.multiplyScalar(scale).clone();\n  return obj;\n};\n\n\nconst createContainer = obj => {\n  let container = new THREE.Object3D();\n  container.add(obj);\n  return container;\n};\n\n\nexport default {\n  normalize,\n  createContainer\n};\n","\nconst getFileExtension = url => {\n  let path = url.split(/[?#]/)[0];\n  let segments = path.split('/');\n  let filename = segments.pop();\n  let ext = filename.split('.');\n  if (ext.length > 0) {\n    return '.' + ext.pop();\n  }\n}\n\nexport default {\n  getFileExtension\n}","import modelUtils from './utils/model';\nimport urlUtils from './utils/url';\n\n\nconst loaders = {};\n\n\nconst register = (ext, handler) => {\n  loaders[ext] = {\n    load: handler,\n    objectCache: {}\n  };\n};\n\n\nconst load = src => {\n  let loader;\n  let object;\n  let ext = urlUtils.getFileExtension(src);\n\n  if (ext) {\n    loader = loaders[ext];\n  }\n\n  if (!loader) {\n    console.error(`Couldn't load \"${src}\". Unknown object format \"${ext}\"`);\n    return Promise.reject();\n  }\n\n  object = loader.objectCache[src];\n  if (!object) {\n    object = loader.load(src).then(obj => {\n      // To help make sizing easier to deal with we normalize the models \n      // dimenstions so its maximum width / height is 1. When rendering the\n      // object we can scale it up by the width of the target DOM element.\n      modelUtils.normalize(obj);\n\n      // Finally the model is inserted into a container.\n      return modelUtils.createContainer(obj);\n    });\n    loader.objectCache[src] = object;\n  }\n  \n  return object.then(model => model.clone());\n};\n\n\nexport default {\n  load,\n  register\n};\n","/**\n * Strips the unit from a value (i.e. 100.55px) and converts the remaining\n * value to a number.\n */\nconst parseUnitValue = value => {\n  return parseFloat(value || 0);\n};\n\n\n/**\n * Parses a CSS origin string (`perspective-origin`, `transform-origin`) into\n * it's X, Y and Z components and populates the supplied THREE.Vector3 with\n * the result.\n */\nconst parseOriginValue = (originString, vec3) => {\n  let transformOrigin = originString.split(' ');\n  vec3.set(\n    parseUnitValue(transformOrigin[0]),\n    parseUnitValue(transformOrigin[1]),\n    parseUnitValue(transformOrigin[2])\n  );\n};\n\n\n/**\n * Parses a CSS 3x2 matrix() or 4x4 matrix3d() string into its compontents and \n * populates the passed THREE.Matrix4 with the result.\n * \n * (https://keithclark.co.uk/articles/calculating-element-vertex-data-from-css-transforms/)\n */\n\nconst parseTransformValue = (matrixString, mat4) => {\n  var c = matrixString.split(/\\s*[(),]\\s*/).slice(1, -1);\n\n  if (c.length === 6) {\n    // 'matrix()' (3x2)\n    mat4.set(\n      +c[0], -c[2],      0,  +c[4],\n      -c[1], +c[3],      0,  -c[5],\n          0,     0,      1,      0,\n          0,     0,      0,      1\n    );\n  } else if (c.length === 16) {\n    // matrix3d() (4x4)\n    mat4.set(\n      +c[0], -c[4],  +c[8], +c[12],\n      -c[1], +c[5],  -c[9], -c[13],\n      +c[2], -c[6], +c[10], +c[14],\n      +c[3], +c[7], +c[11], +c[15]\n    );\n  } else {\n    // handle 'none' or invalid values.\n    mat4.identity();\n  }\n};\n\n\nexport default {\n  parseTransformValue,\n  parseOriginValue,\n  parseUnitValue\n};\n","import cssUtils from './css';\n\n/**\n * Resolves and returns the transform and perspective properties for a given\n * element.\n */\n\nconst getTransformForElement = elem => {\n  let m1 = new THREE.Matrix4();\n  let transformMatrix = new THREE.Matrix4();\n  let transformOrigin = new THREE.Vector3();\n  let transformOriginMatrix = new THREE.Matrix4();\n  let osParent = elem;\n  let stack = [];\n  let posX = 0;\n  let posY = 0;\n\n\n\n  // We need to apply transforms from the root so we walk up the DOM tree,\n  // pushing each node onto a stack. While we're walking to the DOM we also\n  // resolve the elements X/Y position.\n  while (elem) {\n    if (elem === osParent) {\n      posX += elem.offsetLeft;\n      posY += elem.offsetTop;\n      osParent = elem.offsetParent;\n    }\n    stack.push(elem);\n    posX -= elem.scrollLeft;\n    posY -= elem.scrollTop;\n    elem = elem.parentElement;\n  }\n\n\n  m1.makeTranslation(posX, -posY, 0);\n\n  // Now we can resolve transforms.\n  while (elem = stack.pop()) {\n\n    let style = getComputedStyle(elem);\n    cssUtils.parseOriginValue(style.transformOrigin, transformOrigin);\n    cssUtils.parseTransformValue(style.transform, transformMatrix);\n\n    let ox = transformOrigin.x - elem.offsetWidth / 2;\n    let oy = transformOrigin.y - elem.offsetHeight / 2;\n    let oz = transformOrigin.z;\n\n    // If the computed `transform-origin` is a value other than `50% 50% 0`\n    // (`0,0,0` in THREE coordinate space) then we need to translate by the\n    // origin before multiplying the element's transform matrix. Finally, we\n    // need undo the translation.\n    if (ox !== 0 || oy !== 0 || oz !== 0) {\n      m1.multiply(transformOriginMatrix.makeTranslation(ox, -oy, oz));\n      m1.multiply(transformMatrix);\n      m1.multiply(transformOriginMatrix.makeTranslation(-ox, oy, -oz));\n    } else {\n      m1.multiply(transformMatrix);\n    }\n  }\n\n  return m1;\n};\n\n\nconst getProjectionForElement = elem => {\n  let perspectiveOrigin = new THREE.Vector3();\n  let perspective;\n  let clipBounds = {\n    left: 0,\n    top: 0,\n    right: innerWidth,\n    bottom: innerHeight\n  };\n  let cameraBounds = {\n    left: 0,\n    top: 0,\n    right: innerWidth,\n    bottom: innerHeight\n  };\n\n\n  while (elem) {\n    let style = getComputedStyle(elem);\n    let elemBounds = elem.getBoundingClientRect();\n\n    // TODO: It's possible to nest perspectives. Need to research the impact\n    // of this and, if possible, how to emulate it. For now, we'll just use\n    // the last value found.\n    let perspectiveValue = style.perspective;\n    if (!perspective) {\n      if (perspectiveValue !== 'none') {\n        perspective = cssUtils.parseUnitValue(perspectiveValue);\n\n        cameraBounds.top = elemBounds.top;\n        cameraBounds.left = elemBounds.left;\n        cameraBounds.right = elemBounds.right;\n        cameraBounds.bottom = elemBounds.bottom;\n\n        // TODO: strictly speaking, `perspective-origin` can be set on any\n        // element, not just the one that has `perspective`. Research the impact\n        // of setting perspective-origin on different elements in the DOM tree.\n        let perspectiveOriginValue = style.perspectiveOrigin;\n        if (perspectiveOriginValue) {\n          cssUtils.parseOriginValue(perspectiveOriginValue, perspectiveOrigin);\n        }\n      }\n    }\n\n\n    if (style.overflow !== 'visible') {\n      clipBounds.top = Math.max(elemBounds.top, clipBounds.top);\n      clipBounds.left = Math.max(elemBounds.left, clipBounds.left);\n      clipBounds.right = Math.min(elemBounds.right, clipBounds.right);\n      clipBounds.bottom = Math.min(elemBounds.bottom, clipBounds.bottom);\n    }\n\n    elem = elem.parentElement;\n\n  }\n\n  return {\n    perspective: perspective,\n    perspectiveOrigin: perspectiveOrigin,\n    clipBounds: clipBounds,\n    cameraBounds: cameraBounds\n  };\n};\n\n\n\nconst createStylesheet = cssText => {\n  let styleElem = document.createElement('style');\n  styleElem.textContent = cssText;\n  return styleElem;\n};\n\n\n\nexport default {\n  getTransformForElement,\n  getProjectionForElement,\n  createStylesheet\n};\n","import domUtils from './utils/dom';\n\nlet camera;\nlet overlayWidth;\nlet overlayHeight;\nlet perspectiveCamera;\nlet orthographicCamera;\nlet renderer;\nlet scene;\nlet light;\n\nconst objs = [];\n\n\nconst init = () => {\n  if (scene) {\n    return false;\n  }\n\n  // create the scene\n  scene = new THREE.Scene();\n\n  // add a light\n  light = new THREE.PointLight(0x808080, 2, 0);\n  light.position.set(0, 0, 0);\n  scene.add(light);\n\n  /*\n  var sphereSize = .5;\n  var pointLightHelper = new THREE.PointLightHelper( light, sphereSize, 0xff00ff );\n  scene.add( pointLightHelper );\n  */\n\n  // create the WebGL renderer\n  renderer = new THREE.WebGLRenderer({\n    antialias: true,\n    alpha: true\n  });\n\n  renderer.setScissorTest(true);\n  renderer.setClearColor(0x000000, 0);\n  renderer.autoClear = false;\n  renderer.sortObjects = false;\n  requestAnimationFrame(render);\n\n  return renderer.domElement;\n};\n\n\nconst add = obj => {\n  let index = objs.indexOf(obj);\n  if (index === -1) {\n    objs.push(obj);\n    return true;\n  }\n  return false;\n};\n\n\nconst remove = (obj) => {\n  let index = objs.indexOf(obj);\n  if (index > -1) {\n    objs.splice(index, 1);\n    return true;\n  }\n  return false;\n};\n\n\nconst update = () => {\n  overlayWidth = window.innerWidth;\n  overlayHeight = window.innerHeight;\n  camera = null;\n  renderer.setSize(overlayWidth, overlayHeight);\n  renderer.clear();\n\n  // Walk over each object and update it\n  objs.forEach(child => {\n    let elem = child.elem;\n    if (elem) {\n      let projection;\n      let transformMatrix;\n      let clipHeight;\n      let clipWidth;\n      let model = child.children[0];\n      let boundsElem = elem.shadowRoot.children[1];\n      let size = model.userData.size;\n      let elemWidth = elem.offsetWidth;\n      let elemHeight = elem.offsetHeight;\n      let scale = Math.min(elemWidth / size.x, elemHeight / size.y);\n      let objWidth = size.x * scale;\n\n      projection = domUtils.getProjectionForElement(elem);\n      clipHeight = projection.clipBounds.bottom - projection.clipBounds.top;\n      clipWidth = projection.clipBounds.right - projection.clipBounds.left;\n\n      // If the elements clip area has a height or width of `0`, bail out early.\n      if (clipWidth <= 0 || clipHeight <= 0) {\n        return;\n      }\n\n      transformMatrix = domUtils.getTransformForElement(elem);\n\n      // Apply the transform matrix of the DOM node to the model\n      child.rotation.setFromRotationMatrix(transformMatrix);\n      child.position.setFromMatrixPosition(transformMatrix);\n      child.scale.setFromMatrixScale(transformMatrix);\n\n      // Objects are normalised so we can scale them up by their width to\n      // render them at the intended size.\n      child.scale.multiplyScalar(scale);\n\n      // Now scale the DOM bounding box so it matches the size and shape of the\n      // model. An `IntersectionObserver` will use this DOM structure to decide\n      // if this model needs to be rendered at the next animation frame.\n      let scaleX = size.x * scale;\n      let scaleY = size.y * scale;\n      let scaleZ = size.z * scale;\n      boundsElem.style.transform = `translate(-50%,-50%)scale3d(${scaleX},${scaleY},${scaleZ})`;\n\n      // Three's coordinate space uses 0,0,0 as the screen centre so we need\n      // to adjust the computed X/Y position back to the top-left of the screen\n      // to match the CSS rendering position.\n      child.position.x -= objWidth - elemWidth / 2;\n      child.position.x += objWidth - overlayWidth / 2;\n      child.position.y -= elemHeight / 2;\n      child.position.y += overlayHeight / 2;\n\n      // Determine which camera to use to project this model and set its\n      // properties prior to rendering\n      if (projection.perspective) {\n        camera = setPerspectiveCamera(\n          projection.cameraBounds,\n          projection.perspective,\n          projection.perspectiveOrigin\n        );\n      } else {\n        camera = setOrthographicCamera(projection.cameraBounds);\n      }\n\n      light.position.x = projection.cameraBounds.left + (projection.cameraBounds.right - projection.cameraBounds.left) / 2 - overlayWidth / 2;\n      light.position.y = overlayHeight / 2 - projection.cameraBounds.top - (projection.cameraBounds.bottom - projection.cameraBounds.top) / 2;\n      light.position.z = camera.far;\n\n      // Set the clipping box (scissor) and render the element.\n      renderer.setScissor(\n        projection.clipBounds.left,\n        overlayHeight - projection.clipBounds.bottom,\n        clipWidth,\n        clipHeight\n      );\n      scene.add(child);\n      renderer.render(scene, camera);\n      scene.remove(child);\n\n    }\n  });\n\n  return !!camera;\n};\n\n\nconst setOrthographicCamera = (bounds) => {\n  let camera;\n\n  if (!orthographicCamera) {\n    orthographicCamera = new THREE.OrthographicCamera();\n  }\n\n  camera = orthographicCamera;\n  camera.left = bounds.left - overlayWidth / 2;\n  camera.top = -bounds.top + overlayHeight / 2;\n  camera.bottom = -bounds.bottom + overlayHeight / 2;\n  camera.right = bounds.right - overlayWidth / 2;\n  camera.near = -700;\n  camera.updateProjectionMatrix();\n\n  return camera;\n};\n\n\nconst setPerspectiveCamera = (bounds, perspective, perspectiveOrigin) => {\n  let camera;\n\n  if (!perspectiveCamera) {\n    perspectiveCamera = new THREE.PerspectiveCamera();\n  }\n\n  camera = perspectiveCamera;\n  camera.fov = 180 * (2 * Math.atan(overlayHeight / 2 / perspective)) / Math.PI;\n  camera.aspect = overlayWidth / overlayHeight;\n  camera.position.set(0, 0, perspective);\n  camera.updateProjectionMatrix();\n\n  // Add perspective-origin\n  let originX = overlayWidth / 2 - bounds.left - perspectiveOrigin.x;\n  let originY = overlayHeight / 2 - bounds.top - perspectiveOrigin.y;\n\n\n  // The default is origin for perspective is `50% 50%`, which equates to\n  // `0,0`. If the author hasn't specified a different value we don't need\n  // to make any adjustments to the projection matrix\n  if (originX !== 0 || originY !== 0) {\n\n    // copy the projection matrix\n    let tmpMatrix = camera.projectionMatrix.clone();\n\n    // set the camera projection matrix to the origin\n    camera.projectionMatrix.makeTranslation(\n      -originX / (overlayWidth / 2),\n      originY / (overlayHeight / 2),\n      0\n    );\n\n    // apply to original camera projection matrix\n    camera.projectionMatrix.multiply(tmpMatrix);\n\n    // remove the origin offset\n    tmpMatrix.makeTranslation(originX, -originY, 0);\n    camera.projectionMatrix.multiply(tmpMatrix);\n\n  }\n\n  return camera;\n};\n\n\nconst render = () => {\n  requestAnimationFrame(render);\n  update();\n};\n\n\nexport default {\n  init,\n  add,\n  remove,\n  render\n};\n","import modelLoader from './modelLoader';\nimport modelLayer from './modelLayer';\nimport domUtils from './utils/dom';\n\n\nconst objects = new WeakMap();\n\n\nconst ATTR_TO_CUSTOM_PROP_MAP = {\n  'width': '--xModelWidth',\n  'height': '--xModelHeight'\n}\n\nconst CANVAS_DEFAULT_STYLES =\n  ':root{' +\n    'transform-style:flat!important;' +\n  '}' +\n  '#x-model-renderLayer{' +\n    'position:fixed;' +\n    'top:0;' +\n    'left:0;' +\n    'pointer-events:none' +\n  '}';\n\n\nconst ELEMENT_DEFAULT_STYLES =\n  ':host{' +\n    'display:inline-block;' +\n    'width:var(--xModelWidth,200px);' +\n    'height:var(--xModelHeight,150px);' +\n    'transform-style:var(--xModelBoundingBoxTransformStyle, preserve-3d)' +\n  '}' +\n  '.boundingBox{' +\n    'visibility:var(--xModelBoundingBoxVisibility, hidden);' +\n    'transform-style:inherit;' +\n    'position:relative;' +\n    'left:50%;' +\n    'top:50%;' +\n    'width:1px;' +\n    'height:1px;' +\n    'background:#08c' +\n  '}' +\n  '.boundingBox__face{' +\n    'position:absolute;' +\n    'width:1px;' +\n    'height:1px;' +\n    'background:#0c0' +\n  '}' +\n  '.boundingBox__face:nth-child(1){transform:translateZ(-.5px)}' +\n  '.boundingBox__face:nth-child(2){transform:translateZ(.5px)}' +\n  '.boundingBox__face:nth-child(3){transform:translateY(-.5px)rotateX(90deg)}' +\n  '.boundingBox__face:nth-child(4){transform:translateY(.5px)rotateX(-90deg)}' +\n  '.boundingBox__face:nth-child(5){transform:translateX(.5px)rotateY(-90deg)}' +\n  '.boundingBox__face:nth-child(6){transform:translateX(-.5px)rotateY(-90deg)}';\n\n\nconst ELEMENT_HTML =\n  `<style>${ELEMENT_DEFAULT_STYLES}</style>` +\n  '<div class=\"boundingBox\">' +\n    '<div class=\"boundingBox__face\"></div>'.repeat(6) +\n  '</div>';\n\n\nlet styleElem;\nlet intersectionObserver;\n\n\nconst intersectionCallback = entries => {\n  entries.forEach(entry => {\n    let obj = objects.get(entry.target.parentElement);\n    if (entry.isIntersecting) {\n      if (obj.axisInView < 6) {\n        if (obj.axisInView === 0) {\n          modelLayer.add(obj);\n        }\n        obj.axisInView++;\n      }\n    } else {\n      if (obj.axisInView > 0) {\n        obj.axisInView--;\n        if (obj.axisInView === 0) {\n          modelLayer.remove(obj);\n        }\n      }\n    }\n  });\n};\n\n\nconst initModelLayer = () => {\n  // The first time an element is added to the document we inject a\n  // stylesheet that contains its default styles. Ideally this would be\n  // appended to the shadow DOM, but support for that isn't great right now.\n  styleElem = domUtils.createStylesheet(CANVAS_DEFAULT_STYLES);\n  let head = document.documentElement.firstChild;\n  head.insertBefore(styleElem, head.firstChild);\n\n  // Initialize the model layer and append the resulting DOM node to the\n  // document root - outside the <body> to prevent perspective or transform\n  // styles from affecting it.\n  let renderDomElement = modelLayer.init();\n  renderDomElement.setAttribute('id', 'x-model-renderLayer');\n  document.documentElement.appendChild(renderDomElement);\n\n  // Use an intersection observer to watch for elements entering and leaving\n  // the viewport\n  intersectionObserver = new IntersectionObserver(intersectionCallback);\n\n};\n\n\nexport default class extends HTMLElement {\n\n  constructor() {\n    super();\n    // Create six child elements. These will be rotated and translated along the\n    // X Y and Z axis to create a bounding box around the model. These\n    // elements will be monitored by an `IntersectionObserver` which will add\n    // the model to the scene if the any elements are visible in the viewport\n    // and remove the model when no elements are visible\n    this.attachShadow({mode: 'open'});\n    this.shadowRoot.innerHTML = ELEMENT_HTML;\n  }\n\n  static get observedAttributes() {\n    return ['src', 'width', 'height'];\n  }\n\n  connectedCallback() {\n    if (!styleElem) {\n      initModelLayer();\n    }\n    let obj = objects.get(this);\n    if (obj && obj.elem !== this) {\n      let model = obj.children[0];\n      let size = model.userData.size;\n      let scale = Math.min(this.offsetWidth / size.x, this.offsetHeight / size.y);\n      let scaleX = size.x * scale;\n      let scaleY = size.y * scale;\n      let scaleZ = size.z * scale;\n\n      // Scale and distort the DOM bounding box (a cube) along X, Y and Z axis\n      // so it matches the size and shape of the models bounding box.\n      let box = this.shadowRoot.querySelector('.boundingBox');\n      box.style.transform = `translate(-50%,-50%)scale3d(${scaleX},${scaleY},${scaleZ})`;\n\n      // Monitor each face with an `IntersectionObserver` so we can determine if\n      // the model is visible in the viewport when it's rendered with\n      // perspective projection.\n      let faces = Array.from(box.children);\n      faces.forEach(elem => intersectionObserver.observe(elem));\n\n      obj.elem = this;\n      obj.axisInView = 0;\n\n      objects.set(box, obj);\n    }\n  }\n\n  disconnectedCallback() {\n    let obj = objects.get(this);\n    if (obj && obj.elem === this) {\n      let box = this.shadowRoot.querySelector('.boundingBox');\n      let faces = Array.from(box.children);\n      faces.forEach(elem => intersectionObserver.unobserve(elem));\n      obj.elem = null;\n    }\n  }\n\n  attributeChangedCallback(attribute, oldValue, newValue) {\n    if (attribute === 'width' || attribute === 'height') {\n      if (newValue !== null) {\n        newValue += 'px';\n      }\n      let customProp = ATTR_TO_CUSTOM_PROP_MAP[attribute];\n      this.shadowRoot.children[0].sheet.rules[0].style.setProperty(customProp, newValue);\n    } else if (attribute === 'src') {\n      // call the disconnected callback handler to release the current model if\n      // one is attached\n      this.disconnectedCallback();\n\n      modelLoader.load(newValue).then(obj => {\n        let event = new UIEvent('load');\n        this.dispatchEvent(event);\n        objects.set(this, obj);\n        this.connectedCallback();\n      }).catch(e => {\n        let event = new UIEvent('error');\n        this.dispatchEvent(event);\n      });\n    }\n  }\n\n}\n","let loader;\n\n\nexport default src => {\n\n  return new Promise((resolve, reject) => {\n\n    const loadHandler = gltf => {\n      resolve(gltf.scene);\n    }\n\n    const errorHandler = () => {\n      reject();\n    }\n\n    if (!loader) {\n      loader = new THREE.GLTFLoader();\n    }\n\n    return loader.load(src, loadHandler, null, errorHandler);\n\n  });\n}\n","let loader;\n\n\nexport default src => {\n\n  return new Promise((resolve, reject) => {\n\n    const loadHandler = obj => {\n      resolve(obj);\n    }\n\n    const errorHandler = () => {\n      reject();\n    }\n\n    if (!loader) {\n      loader = new THREE.OBJLoader();\n    }\n\n    return loader.load(src, loadHandler, null, errorHandler);\n\n  });\n}\n","import HTMLModelElement from './modelElement.js';\nimport modelLoader from './modelLoader.js';\nimport gltfLoader from './loaders/gltf';\nimport objLoader from './loaders/obj';\n\n\nif ('customElements' in window) {\n\n  if (!('THREE' in window)) {\n    throw 'THREE (threejs.org) is required.';\n  }\n\n  if ('GLTFLoader' in THREE) {\n    modelLoader.register('.gltf', gltfLoader);\n    modelLoader.register('.glb', gltfLoader);\n  }\n\n  if ('OBJLoader' in THREE) {\n    modelLoader.register('.obj', objLoader);\n  }\n\n  customElements.define('x-model', 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+{"version":3,"file":"model-element.js","sources":["../src/utils/model.js","../src/utils/url.js","../src/modelLoader.js","../src/utils/css.js","../src/utils/dom.js","../src/modelLayer.js","../src/modelElement.js","../src/loaders/gltf.js","../src/loaders/obj.js","../src/index.js"],"sourcesContent":["\nconst normalize = obj => {\n  let box = new THREE.Box3().setFromObject(obj);\n  let size = new THREE.Vector3();\n  box.getCenter(obj.position);\n  box.getSize(size);\n\n  let scale = 1 / Math.max(size.x, size.y);\n  obj.position.multiplyScalar(-scale);\n  obj.scale.multiplyScalar(scale);\n  obj.userData.size = size.multiplyScalar(scale).clone();\n  return obj;\n};\n\n\nconst createContainer = obj => {\n  let container = new THREE.Object3D();\n  container.add(obj);\n  return container;\n};\n\n\nexport default {\n  normalize,\n  createContainer\n};\n","\nconst getFileExtension = url => {\n  let path = url.split(/[?#]/)[0];\n  let segments = path.split('/');\n  let filename = segments.pop();\n  let ext = filename.split('.');\n  if (ext.length > 0) {\n    return '.' + ext.pop();\n  }\n}\n\nexport default {\n  getFileExtension\n}","import modelUtils from './utils/model';\nimport urlUtils from './utils/url';\n\n\nconst loaders = {};\n\n\nconst register = (ext, handler) => {\n  loaders[ext] = {\n    load: handler,\n    objectCache: {}\n  };\n};\n\n\nconst load = src => {\n  let loader;\n  let object;\n  let ext = urlUtils.getFileExtension(src);\n\n  if (ext) {\n    loader = loaders[ext];\n  }\n\n  if (!loader) {\n    console.error(`Couldn't load \"${src}\". Unknown object format \"${ext}\"`);\n    return Promise.reject();\n  }\n\n  object = loader.objectCache[src];\n  if (!object) {\n    object = loader.load(src).then(obj => {\n      // To help make sizing easier to deal with we normalize the models \n      // dimenstions so its maximum width / height is 1. When rendering the\n      // object we can scale it up by the width of the target DOM element.\n      modelUtils.normalize(obj);\n\n      // Finally the model is inserted into a container.\n      return modelUtils.createContainer(obj);\n    });\n    loader.objectCache[src] = object;\n  }\n  \n  return object.then(model => model.clone());\n};\n\n\nexport default {\n  load,\n  register\n};\n","/**\n * Strips the unit from a value (i.e. 100.55px) and converts the remaining\n * value to a number.\n */\nconst parseUnitValue = value => {\n  return parseFloat(value || 0);\n};\n\n\n/**\n * Parses a CSS origin string (`perspective-origin`, `transform-origin`) into\n * it's X, Y and Z components and populates the supplied THREE.Vector3 with\n * the result.\n */\nconst parseOriginValue = (originString, vec3) => {\n  let transformOrigin = originString.split(' ');\n  vec3.set(\n    parseUnitValue(transformOrigin[0]),\n    parseUnitValue(transformOrigin[1]),\n    parseUnitValue(transformOrigin[2])\n  );\n};\n\n\n/**\n * Parses a CSS 3x2 matrix() or 4x4 matrix3d() string into its compontents and \n * populates the passed THREE.Matrix4 with the result.\n * \n * (https://keithclark.co.uk/articles/calculating-element-vertex-data-from-css-transforms/)\n */\n\nconst parseTransformValue = (matrixString, mat4) => {\n  var c = matrixString.split(/\\s*[(),]\\s*/).slice(1, -1);\n\n  if (c.length === 6) {\n    // 'matrix()' (3x2)\n    mat4.set(\n      +c[0], -c[2],      0,  +c[4],\n      -c[1], +c[3],      0,  -c[5],\n          0,     0,      1,      0,\n          0,     0,      0,      1\n    );\n  } else if (c.length === 16) {\n    // matrix3d() (4x4)\n    mat4.set(\n      +c[0], -c[4],  +c[8], +c[12],\n      -c[1], +c[5],  -c[9], -c[13],\n      +c[2], -c[6], +c[10], +c[14],\n      +c[3], +c[7], +c[11], +c[15]\n    );\n  } else {\n    // handle 'none' or invalid values.\n    mat4.identity();\n  }\n};\n\n\nexport default {\n  parseTransformValue,\n  parseOriginValue,\n  parseUnitValue\n};\n","import cssUtils from './css';\n\n/**\n * Resolves and returns the transform and perspective properties for a given\n * element.\n */\n\nconst getTransformForElement = elem => {\n  let m1 = new THREE.Matrix4();\n  let transformMatrix = new THREE.Matrix4();\n  let transformOrigin = new THREE.Vector3();\n  let transformOriginMatrix = new THREE.Matrix4();\n  let osParent = elem;\n  let stack = [];\n  let posX = 0;\n  let posY = 0;\n\n\n\n  // We need to apply transforms from the root so we walk up the DOM tree,\n  // pushing each node onto a stack. While we're walking to the DOM we also\n  // resolve the elements X/Y position.\n  while (elem) {\n    if (elem === osParent) {\n      posX += elem.offsetLeft;\n      posY += elem.offsetTop;\n      osParent = elem.offsetParent;\n    }\n    stack.push(elem);\n    posX -= elem.scrollLeft;\n    posY -= elem.scrollTop;\n    elem = elem.parentElement;\n  }\n\n\n  m1.makeTranslation(posX, -posY, 0);\n\n  // Now we can resolve transforms.\n  while (elem = stack.pop()) {\n\n    let style = getComputedStyle(elem);\n    cssUtils.parseOriginValue(style.transformOrigin, transformOrigin);\n    cssUtils.parseTransformValue(style.transform, transformMatrix);\n\n    let ox = transformOrigin.x - elem.offsetWidth / 2;\n    let oy = transformOrigin.y - elem.offsetHeight / 2;\n    let oz = transformOrigin.z;\n\n    // If the computed `transform-origin` is a value other than `50% 50% 0`\n    // (`0,0,0` in THREE coordinate space) then we need to translate by the\n    // origin before multiplying the element's transform matrix. Finally, we\n    // need undo the translation.\n    if (ox !== 0 || oy !== 0 || oz !== 0) {\n      m1.multiply(transformOriginMatrix.makeTranslation(ox, -oy, oz));\n      m1.multiply(transformMatrix);\n      m1.multiply(transformOriginMatrix.makeTranslation(-ox, oy, -oz));\n    } else {\n      m1.multiply(transformMatrix);\n    }\n  }\n\n  return m1;\n};\n\n\nconst getProjectionForElement = elem => {\n  let perspectiveOrigin = new THREE.Vector3();\n  let perspective;\n  let clipBounds = {\n    left: 0,\n    top: 0,\n    right: innerWidth,\n    bottom: innerHeight\n  };\n  let cameraBounds = {\n    left: 0,\n    top: 0,\n    right: innerWidth,\n    bottom: innerHeight\n  };\n\n\n  while (elem) {\n    let style = getComputedStyle(elem);\n    let elemBounds = elem.getBoundingClientRect();\n\n    // TODO: It's possible to nest perspectives. Need to research the impact\n    // of this and, if possible, how to emulate it. For now, we'll just use\n    // the last value found.\n    let perspectiveValue = style.perspective;\n    if (!perspective) {\n      if (perspectiveValue !== 'none') {\n        perspective = cssUtils.parseUnitValue(perspectiveValue);\n\n        cameraBounds.top = elemBounds.top;\n        cameraBounds.left = elemBounds.left;\n        cameraBounds.right = elemBounds.right;\n        cameraBounds.bottom = elemBounds.bottom;\n\n        // TODO: strictly speaking, `perspective-origin` can be set on any\n        // element, not just the one that has `perspective`. Research the impact\n        // of setting perspective-origin on different elements in the DOM tree.\n        let perspectiveOriginValue = style.perspectiveOrigin;\n        if (perspectiveOriginValue) {\n          cssUtils.parseOriginValue(perspectiveOriginValue, perspectiveOrigin);\n        }\n      }\n    }\n\n\n    if (style.overflow !== 'visible') {\n      clipBounds.top = Math.max(elemBounds.top, clipBounds.top);\n      clipBounds.left = Math.max(elemBounds.left, clipBounds.left);\n      clipBounds.right = Math.min(elemBounds.right, clipBounds.right);\n      clipBounds.bottom = Math.min(elemBounds.bottom, clipBounds.bottom);\n    }\n\n    elem = elem.parentElement;\n\n  }\n\n  return {\n    perspective: perspective,\n    perspectiveOrigin: perspectiveOrigin,\n    clipBounds: clipBounds,\n    cameraBounds: cameraBounds\n  };\n};\n\n\n\nconst createStylesheet = cssText => {\n  let styleElem = document.createElement('style');\n  styleElem.textContent = cssText;\n  return styleElem;\n};\n\n\n\nexport default {\n  getTransformForElement,\n  getProjectionForElement,\n  createStylesheet\n};\n","import domUtils from './utils/dom';\n\nlet camera;\nlet overlayWidth;\nlet overlayHeight;\nlet perspectiveCamera;\nlet orthographicCamera;\nlet renderer;\nlet scene;\nlet light;\n\nconst objs = [];\n\n\nconst init = () => {\n  if (scene) {\n    return false;\n  }\n\n  // create the scene\n  scene = new THREE.Scene();\n\n  // add a light\n  light = new THREE.PointLight(0x808080, 2, 0);\n  light.position.set(0, 0, 0);\n  scene.add(light);\n\n  /*\n  var sphereSize = .5;\n  var pointLightHelper = new THREE.PointLightHelper( light, sphereSize, 0xff00ff );\n  scene.add( pointLightHelper );\n  */\n\n  // create the WebGL renderer\n  renderer = new THREE.WebGLRenderer({\n    antialias: true,\n    alpha: true\n  });\n\n  renderer.setPixelRatio(window.devicePixelRatio);\n  renderer.setScissorTest(true);\n  renderer.setClearColor(0x000000, 0);\n  renderer.autoClear = false;\n  renderer.sortObjects = false;\n  requestAnimationFrame(render);\n\n  return renderer.domElement;\n};\n\n\nconst add = obj => {\n  let index = objs.indexOf(obj);\n  if (index === -1) {\n    objs.push(obj);\n    return true;\n  }\n  return false;\n};\n\n\nconst remove = (obj) => {\n  let index = objs.indexOf(obj);\n  if (index > -1) {\n    objs.splice(index, 1);\n    return true;\n  }\n  return false;\n};\n\n\nconst update = () => {\n  overlayWidth = window.innerWidth;\n  overlayHeight = window.innerHeight;\n  camera = null;\n  renderer.setSize(overlayWidth, overlayHeight);\n  renderer.clear();\n\n  // Walk over each object and update it\n  objs.forEach(child => {\n    let elem = child.elem;\n    if (elem) {\n      let projection;\n      let transformMatrix;\n      let clipHeight;\n      let clipWidth;\n      let model = child.children[0];\n      let boundsElem = elem.shadowRoot.children[1];\n      let size = model.userData.size;\n      let elemWidth = elem.offsetWidth;\n      let elemHeight = elem.offsetHeight;\n      let scale = Math.min(elemWidth / size.x, elemHeight / size.y);\n      let objWidth = size.x * scale;\n\n      projection = domUtils.getProjectionForElement(elem);\n      clipHeight = projection.clipBounds.bottom - projection.clipBounds.top;\n      clipWidth = projection.clipBounds.right - projection.clipBounds.left;\n\n      // If the elements clip area has a height or width of `0`, bail out early.\n      if (clipWidth <= 0 || clipHeight <= 0) {\n        return;\n      }\n\n      transformMatrix = domUtils.getTransformForElement(elem);\n\n      // Apply the transform matrix of the DOM node to the model\n      child.rotation.setFromRotationMatrix(transformMatrix);\n      child.position.setFromMatrixPosition(transformMatrix);\n      child.scale.setFromMatrixScale(transformMatrix);\n\n      // Objects are normalised so we can scale them up by their width to\n      // render them at the intended size.\n      child.scale.multiplyScalar(scale);\n\n      // Now scale the DOM bounding box so it matches the size and shape of the\n      // model. An `IntersectionObserver` will use this DOM structure to decide\n      // if this model needs to be rendered at the next animation frame.\n      let scaleX = size.x * scale;\n      let scaleY = size.y * scale;\n      let scaleZ = size.z * scale;\n      boundsElem.style.transform = `translate(-50%,-50%)scale3d(${scaleX},${scaleY},${scaleZ})`;\n\n      // Three's coordinate space uses 0,0,0 as the screen centre so we need\n      // to adjust the computed X/Y position back to the top-left of the screen\n      // to match the CSS rendering position.\n      child.position.x -= objWidth - elemWidth / 2;\n      child.position.x += objWidth - overlayWidth / 2;\n      child.position.y -= elemHeight / 2;\n      child.position.y += overlayHeight / 2;\n\n      // Determine which camera to use to project this model and set its\n      // properties prior to rendering\n      if (projection.perspective) {\n        camera = setPerspectiveCamera(\n          projection.cameraBounds,\n          projection.perspective,\n          projection.perspectiveOrigin\n        );\n      } else {\n        camera = setOrthographicCamera(projection.cameraBounds);\n      }\n\n      light.position.x = projection.cameraBounds.left + (projection.cameraBounds.right - projection.cameraBounds.left) / 2 - overlayWidth / 2;\n      light.position.y = overlayHeight / 2 - projection.cameraBounds.top - (projection.cameraBounds.bottom - projection.cameraBounds.top) / 2;\n      light.position.z = camera.far;\n\n      // Set the clipping box (scissor) and render the element.\n      renderer.setScissor(\n        projection.clipBounds.left,\n        overlayHeight - projection.clipBounds.bottom,\n        clipWidth,\n        clipHeight\n      );\n      scene.add(child);\n      renderer.render(scene, camera);\n      scene.remove(child);\n\n    }\n  });\n\n  return !!camera;\n};\n\n\nconst setOrthographicCamera = (bounds) => {\n  let camera;\n\n  if (!orthographicCamera) {\n    orthographicCamera = new THREE.OrthographicCamera();\n  }\n\n  camera = orthographicCamera;\n  camera.left = bounds.left - overlayWidth / 2;\n  camera.top = -bounds.top + overlayHeight / 2;\n  camera.bottom = -bounds.bottom + overlayHeight / 2;\n  camera.right = bounds.right - overlayWidth / 2;\n  camera.near = -700;\n  camera.updateProjectionMatrix();\n\n  return camera;\n};\n\n\nconst setPerspectiveCamera = (bounds, perspective, perspectiveOrigin) => {\n  let camera;\n\n  if (!perspectiveCamera) {\n    perspectiveCamera = new THREE.PerspectiveCamera();\n  }\n\n  camera = perspectiveCamera;\n  camera.fov = 180 * (2 * Math.atan(overlayHeight / 2 / perspective)) / Math.PI;\n  camera.aspect = overlayWidth / overlayHeight;\n  camera.position.set(0, 0, perspective);\n  camera.updateProjectionMatrix();\n\n  // Add perspective-origin\n  let originX = overlayWidth / 2 - bounds.left - perspectiveOrigin.x;\n  let originY = overlayHeight / 2 - bounds.top - perspectiveOrigin.y;\n\n\n  // The default is origin for perspective is `50% 50%`, which equates to\n  // `0,0`. If the author hasn't specified a different value we don't need\n  // to make any adjustments to the projection matrix\n  if (originX !== 0 || originY !== 0) {\n\n    // copy the projection matrix\n    let tmpMatrix = camera.projectionMatrix.clone();\n\n    // set the camera projection matrix to the origin\n    camera.projectionMatrix.makeTranslation(\n      -originX / (overlayWidth / 2),\n      originY / (overlayHeight / 2),\n      0\n    );\n\n    // apply to original camera projection matrix\n    camera.projectionMatrix.multiply(tmpMatrix);\n\n    // remove the origin offset\n    tmpMatrix.makeTranslation(originX, -originY, 0);\n    camera.projectionMatrix.multiply(tmpMatrix);\n\n  }\n\n  return camera;\n};\n\n\nconst render = () => {\n  requestAnimationFrame(render);\n  update();\n};\n\n\nexport default {\n  init,\n  add,\n  remove,\n  render\n};\n","import modelLoader from './modelLoader';\nimport modelLayer from './modelLayer';\nimport domUtils from './utils/dom';\n\n\nconst objects = new WeakMap();\n\n\nconst ATTR_TO_CUSTOM_PROP_MAP = {\n  'width': '--xModelWidth',\n  'height': '--xModelHeight'\n}\n\nconst CANVAS_DEFAULT_STYLES =\n  ':root{' +\n    'transform-style:flat!important;' +\n  '}' +\n  '#x-model-renderLayer{' +\n    'position:fixed;' +\n    'top:0;' +\n    'left:0;' +\n    'pointer-events:none' +\n  '}';\n\n\nconst ELEMENT_DEFAULT_STYLES =\n  ':host{' +\n    'display:inline-block;' +\n    'width:var(--xModelWidth,200px);' +\n    'height:var(--xModelHeight,150px);' +\n    'transform-style:var(--xModelBoundingBoxTransformStyle, preserve-3d)' +\n  '}' +\n  '.boundingBox{' +\n    'visibility:var(--xModelBoundingBoxVisibility, hidden);' +\n    'transform-style:inherit;' +\n    'position:relative;' +\n    'left:50%;' +\n    'top:50%;' +\n    'width:1px;' +\n    'height:1px;' +\n    'background:#08c' +\n  '}' +\n  '.boundingBox__face{' +\n    'position:absolute;' +\n    'width:1px;' +\n    'height:1px;' +\n    'background:#0c0' +\n  '}' +\n  '.boundingBox__face:nth-child(1){transform:translateZ(-.5px)}' +\n  '.boundingBox__face:nth-child(2){transform:translateZ(.5px)}' +\n  '.boundingBox__face:nth-child(3){transform:translateY(-.5px)rotateX(90deg)}' +\n  '.boundingBox__face:nth-child(4){transform:translateY(.5px)rotateX(-90deg)}' +\n  '.boundingBox__face:nth-child(5){transform:translateX(.5px)rotateY(-90deg)}' +\n  '.boundingBox__face:nth-child(6){transform:translateX(-.5px)rotateY(-90deg)}';\n\n\nconst ELEMENT_HTML =\n  `<style>${ELEMENT_DEFAULT_STYLES}</style>` +\n  '<div class=\"boundingBox\">' +\n    '<div class=\"boundingBox__face\"></div>'.repeat(6) +\n  '</div>';\n\n\nlet styleElem;\nlet intersectionObserver;\n\n\nconst intersectionCallback = entries => {\n  entries.forEach(entry => {\n    let obj = objects.get(entry.target.parentElement);\n    if (entry.isIntersecting) {\n      if (obj.axisInView < 6) {\n        if (obj.axisInView === 0) {\n          modelLayer.add(obj);\n        }\n        obj.axisInView++;\n      }\n    } else {\n      if (obj.axisInView > 0) {\n        obj.axisInView--;\n        if (obj.axisInView === 0) {\n          modelLayer.remove(obj);\n        }\n      }\n    }\n  });\n};\n\n\nconst initModelLayer = () => {\n  // The first time an element is added to the document we inject a\n  // stylesheet that contains its default styles. Ideally this would be\n  // appended to the shadow DOM, but support for that isn't great right now.\n  styleElem = domUtils.createStylesheet(CANVAS_DEFAULT_STYLES);\n  let head = document.documentElement.firstChild;\n  head.insertBefore(styleElem, head.firstChild);\n\n  // Initialize the model layer and append the resulting DOM node to the\n  // document root - outside the <body> to prevent perspective or transform\n  // styles from affecting it.\n  let renderDomElement = modelLayer.init();\n  renderDomElement.setAttribute('id', 'x-model-renderLayer');\n  document.documentElement.appendChild(renderDomElement);\n\n  // Use an intersection observer to watch for elements entering and leaving\n  // the viewport\n  intersectionObserver = new IntersectionObserver(intersectionCallback);\n\n};\n\n\nexport default class extends HTMLElement {\n\n  constructor() {\n    super();\n    // Create six child elements. These will be rotated and translated along the\n    // X Y and Z axis to create a bounding box around the model. These\n    // elements will be monitored by an `IntersectionObserver` which will add\n    // the model to the scene if the any elements are visible in the viewport\n    // and remove the model when no elements are visible\n    this.attachShadow({mode: 'open'});\n    this.shadowRoot.innerHTML = ELEMENT_HTML;\n  }\n\n  static get observedAttributes() {\n    return ['src', 'width', 'height'];\n  }\n\n  connectedCallback() {\n    if (!styleElem) {\n      initModelLayer();\n    }\n    let obj = objects.get(this);\n    if (obj && obj.elem !== this) {\n      let model = obj.children[0];\n      let size = model.userData.size;\n      let scale = Math.min(this.offsetWidth / size.x, this.offsetHeight / size.y);\n      let scaleX = size.x * scale;\n      let scaleY = size.y * scale;\n      let scaleZ = size.z * scale;\n\n      // Scale and distort the DOM bounding box (a cube) along X, Y and Z axis\n      // so it matches the size and shape of the models bounding box.\n      let box = this.shadowRoot.querySelector('.boundingBox');\n      box.style.transform = `translate(-50%,-50%)scale3d(${scaleX},${scaleY},${scaleZ})`;\n\n      // Monitor each face with an `IntersectionObserver` so we can determine if\n      // the model is visible in the viewport when it's rendered with\n      // perspective projection.\n      let faces = Array.from(box.children);\n      faces.forEach(elem => intersectionObserver.observe(elem));\n\n      obj.elem = this;\n      obj.axisInView = 0;\n\n      objects.set(box, obj);\n    }\n  }\n\n  disconnectedCallback() {\n    let obj = objects.get(this);\n    if (obj && obj.elem === this) {\n      let box = this.shadowRoot.querySelector('.boundingBox');\n      let faces = Array.from(box.children);\n      faces.forEach(elem => intersectionObserver.unobserve(elem));\n      obj.elem = null;\n    }\n  }\n\n  attributeChangedCallback(attribute, oldValue, newValue) {\n    if (attribute === 'width' || attribute === 'height') {\n      if (newValue !== null) {\n        newValue += 'px';\n      }\n      let customProp = ATTR_TO_CUSTOM_PROP_MAP[attribute];\n      this.shadowRoot.children[0].sheet.rules[0].style.setProperty(customProp, newValue);\n    } else if (attribute === 'src') {\n      // call the disconnected callback handler to release the current model if\n      // one is attached\n      this.disconnectedCallback();\n\n      modelLoader.load(newValue).then(obj => {\n        let event = new UIEvent('load');\n        this.dispatchEvent(event);\n        objects.set(this, obj);\n        this.connectedCallback();\n      }).catch(e => {\n        let event = new UIEvent('error');\n        this.dispatchEvent(event);\n      });\n    }\n  }\n\n}\n","let loader;\n\n\nexport default src => {\n\n  return new Promise((resolve, reject) => {\n\n    const loadHandler = gltf => {\n      resolve(gltf.scene);\n    }\n\n    const errorHandler = () => {\n      reject();\n    }\n\n    if (!loader) {\n      loader = new THREE.GLTFLoader();\n    }\n\n    return loader.load(src, loadHandler, null, errorHandler);\n\n  });\n}\n","let loader;\n\n\nexport default src => {\n\n  return new Promise((resolve, reject) => {\n\n    const loadHandler = obj => {\n      resolve(obj);\n    }\n\n    const errorHandler = () => {\n      reject();\n    }\n\n    if (!loader) {\n      loader = new THREE.OBJLoader();\n    }\n\n    return loader.load(src, loadHandler, null, errorHandler);\n\n  });\n}\n","import HTMLModelElement from './modelElement.js';\nimport modelLoader from './modelLoader.js';\nimport gltfLoader from './loaders/gltf';\nimport objLoader from './loaders/obj';\n\n\nif ('customElements' in window) {\n\n  if (!('THREE' in window)) {\n    throw 'THREE (threejs.org) is required.';\n  }\n\n  if ('GLTFLoader' in THREE) {\n    modelLoader.register('.gltf', gltfLoader);\n    modelLoader.register('.glb', gltfLoader);\n  }\n\n  if ('OBJLoader' in THREE) {\n    modelLoader.register('.obj', objLoader);\n  }\n\n  customElements.define('x-model', 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\ No newline at end of file
diff --git a/dist/model-element.min.js b/dist/model-element.min.js
index 5d627d1..8c1349e 100644
--- a/dist/model-element.min.js
+++ b/dist/model-element.min.js
@@ -1,2 +1,2 @@
 //! 3D Model Element v1.0.2 | (C) Keith Clark | MIT | https://github.com/keithclark/3d-model-element
-(function(){'use strict';var a=Math.min,b=Math.max,c={normalize:a=>{let c=new THREE.Box3().setFromObject(a),d=new THREE.Vector3;c.getCenter(a.position),c.getSize(d);let e=1/b(d.x,d.y);return a.position.multiplyScalar(-e),a.scale.multiplyScalar(e),a.userData.size=d.multiplyScalar(e).clone(),a},createContainer:a=>{let b=new THREE.Object3D;return b.add(a),b}},d={getFileExtension:a=>{let b=a.split(/[?#]/)[0],c=b.split("/"),d=c.pop(),e=d.split(".");if(0<e.length)return"."+e.pop()}};const e={},f=a=>{let b,f,g=d.getFileExtension(a);return(g&&(b=e[g]),!b)?(console.error(`Couldn't load "${a}". Unknown object format "${g}"`),Promise.reject()):(f=b.objectCache[a],f||(f=b.load(a).then(a=>(c.normalize(a),c.createContainer(a))),b.objectCache[a]=f),f.then(a=>a.clone()))};var g={load:f,register:(a,b)=>{e[a]={load:b,objectCache:{}}}};const h=a=>parseFloat(a||0);var i={parseTransformValue:(a,b)=>{var d=a.split(/\s*[(),]\s*/).slice(1,-1);6===d.length?b.set(+d[0],-d[2],0,+d[4],-d[1],+d[3],0,-d[5],0,0,1,0,0,0,0,1):16===d.length?b.set(+d[0],-d[4],+d[8],+d[12],-d[1],+d[5],-d[9],-d[13],+d[2],-d[6],+d[10],+d[14],+d[3],+d[7],+d[11],+d[15]):b.identity()},parseOriginValue:(a,b)=>{let c=a.split(" ");b.set(h(c[0]),h(c[1]),h(c[2]))},parseUnitValue:h};const j=a=>{let b=document.createElement("style");return b.textContent=a,b};var k={getTransformForElement:a=>{let b=new THREE.Matrix4,c=new THREE.Matrix4,d=new THREE.Vector3,e=new THREE.Matrix4,f=a,g=[],h=0,j=0;for(;a;)a===f&&(h+=a.offsetLeft,j+=a.offsetTop,f=a.offsetParent),g.push(a),h-=a.scrollLeft,j-=a.scrollTop,a=a.parentElement;for(b.makeTranslation(h,-j,0);a=g.pop();){let f=getComputedStyle(a);i.parseOriginValue(f.transformOrigin,d),i.parseTransformValue(f.transform,c);let g=d.x-a.offsetWidth/2,h=d.y-a.offsetHeight/2,j=d.z;0!=g||0!==h||0!==j?(b.multiply(e.makeTranslation(g,-h,j)),b.multiply(c),b.multiply(e.makeTranslation(-g,h,-j))):b.multiply(c)}return b},getProjectionForElement:c=>{let d,e=new THREE.Vector3,f={left:0,top:0,right:innerWidth,bottom:innerHeight},g={left:0,top:0,right:innerWidth,bottom:innerHeight};for(;c;){let h=getComputedStyle(c),j=c.getBoundingClientRect(),k=h.perspective;if(!d&&"none"!==k){d=i.parseUnitValue(k),g.top=j.top,g.left=j.left,g.right=j.right,g.bottom=j.bottom;let a=h.perspectiveOrigin;a&&i.parseOriginValue(a,e)}"visible"!==h.overflow&&(f.top=b(j.top,f.top),f.left=b(j.left,f.left),f.right=a(j.right,f.right),f.bottom=a(j.bottom,f.bottom)),c=c.parentElement}return{perspective:d,perspectiveOrigin:e,clipBounds:f,cameraBounds:g}},createStylesheet:j};let l,m,n,o,p,q,r,s;const t=[],u=()=>!r&&(r=new THREE.Scene,s=new THREE.PointLight(8421504,2,0),s.position.set(0,0,0),r.add(s),q=new THREE.WebGLRenderer({antialias:!0,alpha:!0}),q.setScissorTest(!0),q.setClearColor(0,0),q.autoClear=!1,q.sortObjects=!1,requestAnimationFrame(y),q.domElement),v=()=>(m=window.innerWidth,n=window.innerHeight,l=null,q.setSize(m,n),q.clear(),t.forEach(b=>{let c=b.elem;if(c){let d,e,f,g,h=b.children[0],i=c.shadowRoot.children[1],j=h.userData.size,o=c.offsetWidth,p=c.offsetHeight,t=a(o/j.x,p/j.y),u=j.x*t;if(d=k.getProjectionForElement(c),f=d.clipBounds.bottom-d.clipBounds.top,g=d.clipBounds.right-d.clipBounds.left,0>=g||0>=f)return;e=k.getTransformForElement(c),b.rotation.setFromRotationMatrix(e),b.position.setFromMatrixPosition(e),b.scale.setFromMatrixScale(e),b.scale.multiplyScalar(t);let v=j.x*t,y=j.y*t,z=j.z*t;i.style.transform=`translate(-50%,-50%)scale3d(${v},${y},${z})`,b.position.x-=u-o/2,b.position.x+=u-m/2,b.position.y-=p/2,b.position.y+=n/2,l=d.perspective?x(d.cameraBounds,d.perspective,d.perspectiveOrigin):w(d.cameraBounds),s.position.x=d.cameraBounds.left+(d.cameraBounds.right-d.cameraBounds.left)/2-m/2,s.position.y=n/2-d.cameraBounds.top-(d.cameraBounds.bottom-d.cameraBounds.top)/2,s.position.z=l.far,q.setScissor(d.clipBounds.left,n-d.clipBounds.bottom,g,f),r.add(b),q.render(r,l),r.remove(b)}}),!!l),w=a=>{let b;return p||(p=new THREE.OrthographicCamera),b=p,b.left=a.left-m/2,b.top=-a.top+n/2,b.bottom=-a.bottom+n/2,b.right=a.right-m/2,b.near=-700,b.updateProjectionMatrix(),b},x=(a,b,c)=>{let d;o||(o=new THREE.PerspectiveCamera),d=o,d.fov=180*(2*Math.atan(n/2/b))/Math.PI,d.aspect=m/n,d.position.set(0,0,b),d.updateProjectionMatrix();let e=m/2-a.left-c.x,f=n/2-a.top-c.y;if(0!=e||0!==f){let a=d.projectionMatrix.clone();d.projectionMatrix.makeTranslation(-e/(m/2),f/(n/2),0),d.projectionMatrix.multiply(a),a.makeTranslation(e,-f,0),d.projectionMatrix.multiply(a)}return d},y=()=>{requestAnimationFrame(y),v()};var z={init:u,add:a=>{let b=t.indexOf(a);return!(-1!==b)&&(t.push(a),!0)},remove:a=>{let b=t.indexOf(a);return!!(-1<b)&&(t.splice(b,1),!0)},render:y};const A=new WeakMap,B={width:"--xModelWidth",height:"--xModelHeight"},C=`<style>${":host{display:inline-block;width:var(--xModelWidth,200px);height:var(--xModelHeight,150px);transform-style:var(--xModelBoundingBoxTransformStyle, preserve-3d)}.boundingBox{visibility:var(--xModelBoundingBoxVisibility, hidden);transform-style:inherit;position:relative;left:50%;top:50%;width:1px;height:1px;background:#08c}.boundingBox__face{position:absolute;width:1px;height:1px;background:#0c0}.boundingBox__face:nth-child(1){transform:translateZ(-.5px)}.boundingBox__face:nth-child(2){transform:translateZ(.5px)}.boundingBox__face:nth-child(3){transform:translateY(-.5px)rotateX(90deg)}.boundingBox__face:nth-child(4){transform:translateY(.5px)rotateX(-90deg)}.boundingBox__face:nth-child(5){transform:translateX(.5px)rotateY(-90deg)}.boundingBox__face:nth-child(6){transform:translateX(-.5px)rotateY(-90deg)}"}</style>`+"<div class=\"boundingBox\">"+"<div class=\"boundingBox__face\"></div>".repeat(6)+"</div>";let D,E;const F=a=>{a.forEach(a=>{let b=A.get(a.target.parentElement);a.isIntersecting?6>b.axisInView&&(0===b.axisInView&&z.add(b),b.axisInView++):0<b.axisInView&&(b.axisInView--,0===b.axisInView&&z.remove(b))})},G=()=>{D=k.createStylesheet(":root{transform-style:flat!important;}#x-model-renderLayer{position:fixed;top:0;left:0;pointer-events:none}");let a=document.documentElement.firstChild;a.insertBefore(D,a.firstChild);let b=z.init();b.setAttribute("id","x-model-renderLayer"),document.documentElement.appendChild(b),E=new IntersectionObserver(F)};class H extends HTMLElement{constructor(){super(),this.attachShadow({mode:"open"}),this.shadowRoot.innerHTML=C}static get observedAttributes(){return["src","width","height"]}connectedCallback(){D||G();let b=A.get(this);if(b&&b.elem!==this){let c=b.children[0],d=c.userData.size,e=a(this.offsetWidth/d.x,this.offsetHeight/d.y),f=d.x*e,g=d.y*e,h=d.z*e,i=this.shadowRoot.querySelector(".boundingBox");i.style.transform=`translate(-50%,-50%)scale3d(${f},${g},${h})`;let j=Array.from(i.children);j.forEach(a=>E.observe(a)),b.elem=this,b.axisInView=0,A.set(i,b)}}disconnectedCallback(){let a=A.get(this);if(a&&a.elem===this){let b=this.shadowRoot.querySelector(".boundingBox"),c=Array.from(b.children);c.forEach(a=>E.unobserve(a)),a.elem=null}}attributeChangedCallback(a,b,c){if("width"===a||"height"===a){null!==c&&(c+="px");let b=B[a];this.shadowRoot.children[0].sheet.rules[0].style.setProperty(b,c)}else"src"===a&&(this.disconnectedCallback(),g.load(c).then(a=>{let b=new UIEvent("load");this.dispatchEvent(b),A.set(this,a),this.connectedCallback()}).catch(()=>{let a=new UIEvent("error");this.dispatchEvent(a)}))}}let I;var J=a=>new Promise((b,c)=>{return I||(I=new THREE.GLTFLoader),I.load(a,a=>{b(a.scene)},null,()=>{c()})});let K;var L=a=>new Promise((b,c)=>{return K||(K=new THREE.OBJLoader),K.load(a,a=>{b(a)},null,()=>{c()})});if("customElements"in window){if(!("THREE"in window))throw"THREE (threejs.org) is required.";"GLTFLoader"in THREE&&(g.register(".gltf",J),g.register(".glb",J)),"OBJLoader"in THREE&&g.register(".obj",L),customElements.define("x-model",H)}})();
\ No newline at end of file
+(function(){'use strict';var a=Math.min,b=Math.max,c={normalize:a=>{let c=new THREE.Box3().setFromObject(a),d=new THREE.Vector3;c.getCenter(a.position),c.getSize(d);let e=1/b(d.x,d.y);return a.position.multiplyScalar(-e),a.scale.multiplyScalar(e),a.userData.size=d.multiplyScalar(e).clone(),a},createContainer:a=>{let b=new THREE.Object3D;return b.add(a),b}},d={getFileExtension:a=>{let b=a.split(/[?#]/)[0],c=b.split("/"),d=c.pop(),e=d.split(".");if(0<e.length)return"."+e.pop()}};const e={},f=a=>{let b,f,g=d.getFileExtension(a);return(g&&(b=e[g]),!b)?(console.error(`Couldn't load "${a}". Unknown object format "${g}"`),Promise.reject()):(f=b.objectCache[a],f||(f=b.load(a).then(a=>(c.normalize(a),c.createContainer(a))),b.objectCache[a]=f),f.then(a=>a.clone()))};var g={load:f,register:(a,b)=>{e[a]={load:b,objectCache:{}}}};const h=a=>parseFloat(a||0);var i={parseTransformValue:(a,b)=>{var d=a.split(/\s*[(),]\s*/).slice(1,-1);6===d.length?b.set(+d[0],-d[2],0,+d[4],-d[1],+d[3],0,-d[5],0,0,1,0,0,0,0,1):16===d.length?b.set(+d[0],-d[4],+d[8],+d[12],-d[1],+d[5],-d[9],-d[13],+d[2],-d[6],+d[10],+d[14],+d[3],+d[7],+d[11],+d[15]):b.identity()},parseOriginValue:(a,b)=>{let c=a.split(" ");b.set(h(c[0]),h(c[1]),h(c[2]))},parseUnitValue:h};const j=a=>{let b=document.createElement("style");return b.textContent=a,b};var k={getTransformForElement:a=>{let b=new THREE.Matrix4,c=new THREE.Matrix4,d=new THREE.Vector3,e=new THREE.Matrix4,f=a,g=[],h=0,j=0;for(;a;)a===f&&(h+=a.offsetLeft,j+=a.offsetTop,f=a.offsetParent),g.push(a),h-=a.scrollLeft,j-=a.scrollTop,a=a.parentElement;for(b.makeTranslation(h,-j,0);a=g.pop();){let f=getComputedStyle(a);i.parseOriginValue(f.transformOrigin,d),i.parseTransformValue(f.transform,c);let g=d.x-a.offsetWidth/2,h=d.y-a.offsetHeight/2,j=d.z;0!=g||0!==h||0!==j?(b.multiply(e.makeTranslation(g,-h,j)),b.multiply(c),b.multiply(e.makeTranslation(-g,h,-j))):b.multiply(c)}return b},getProjectionForElement:c=>{let d,e=new THREE.Vector3,f={left:0,top:0,right:innerWidth,bottom:innerHeight},g={left:0,top:0,right:innerWidth,bottom:innerHeight};for(;c;){let h=getComputedStyle(c),j=c.getBoundingClientRect(),k=h.perspective;if(!d&&"none"!==k){d=i.parseUnitValue(k),g.top=j.top,g.left=j.left,g.right=j.right,g.bottom=j.bottom;let a=h.perspectiveOrigin;a&&i.parseOriginValue(a,e)}"visible"!==h.overflow&&(f.top=b(j.top,f.top),f.left=b(j.left,f.left),f.right=a(j.right,f.right),f.bottom=a(j.bottom,f.bottom)),c=c.parentElement}return{perspective:d,perspectiveOrigin:e,clipBounds:f,cameraBounds:g}},createStylesheet:j};let l,m,n,o,p,q,r,s;const t=[],u=()=>!r&&(r=new THREE.Scene,s=new THREE.PointLight(8421504,2,0),s.position.set(0,0,0),r.add(s),q=new THREE.WebGLRenderer({antialias:!0,alpha:!0}),q.setPixelRatio(window.devicePixelRatio),q.setScissorTest(!0),q.setClearColor(0,0),q.autoClear=!1,q.sortObjects=!1,requestAnimationFrame(y),q.domElement),v=()=>(m=window.innerWidth,n=window.innerHeight,l=null,q.setSize(m,n),q.clear(),t.forEach(b=>{let c=b.elem;if(c){let d,e,f,g,h=b.children[0],i=c.shadowRoot.children[1],j=h.userData.size,o=c.offsetWidth,p=c.offsetHeight,t=a(o/j.x,p/j.y),u=j.x*t;if(d=k.getProjectionForElement(c),f=d.clipBounds.bottom-d.clipBounds.top,g=d.clipBounds.right-d.clipBounds.left,0>=g||0>=f)return;e=k.getTransformForElement(c),b.rotation.setFromRotationMatrix(e),b.position.setFromMatrixPosition(e),b.scale.setFromMatrixScale(e),b.scale.multiplyScalar(t);let v=j.x*t,y=j.y*t,z=j.z*t;i.style.transform=`translate(-50%,-50%)scale3d(${v},${y},${z})`,b.position.x-=u-o/2,b.position.x+=u-m/2,b.position.y-=p/2,b.position.y+=n/2,l=d.perspective?x(d.cameraBounds,d.perspective,d.perspectiveOrigin):w(d.cameraBounds),s.position.x=d.cameraBounds.left+(d.cameraBounds.right-d.cameraBounds.left)/2-m/2,s.position.y=n/2-d.cameraBounds.top-(d.cameraBounds.bottom-d.cameraBounds.top)/2,s.position.z=l.far,q.setScissor(d.clipBounds.left,n-d.clipBounds.bottom,g,f),r.add(b),q.render(r,l),r.remove(b)}}),!!l),w=a=>{let b;return p||(p=new THREE.OrthographicCamera),b=p,b.left=a.left-m/2,b.top=-a.top+n/2,b.bottom=-a.bottom+n/2,b.right=a.right-m/2,b.near=-700,b.updateProjectionMatrix(),b},x=(a,b,c)=>{let d;o||(o=new THREE.PerspectiveCamera),d=o,d.fov=180*(2*Math.atan(n/2/b))/Math.PI,d.aspect=m/n,d.position.set(0,0,b),d.updateProjectionMatrix();let e=m/2-a.left-c.x,f=n/2-a.top-c.y;if(0!=e||0!==f){let a=d.projectionMatrix.clone();d.projectionMatrix.makeTranslation(-e/(m/2),f/(n/2),0),d.projectionMatrix.multiply(a),a.makeTranslation(e,-f,0),d.projectionMatrix.multiply(a)}return d},y=()=>{requestAnimationFrame(y),v()};var z={init:u,add:a=>{let b=t.indexOf(a);return!(-1!==b)&&(t.push(a),!0)},remove:a=>{let b=t.indexOf(a);return!!(-1<b)&&(t.splice(b,1),!0)},render:y};const A=new WeakMap,B={width:"--xModelWidth",height:"--xModelHeight"},C=`<style>${":host{display:inline-block;width:var(--xModelWidth,200px);height:var(--xModelHeight,150px);transform-style:var(--xModelBoundingBoxTransformStyle, preserve-3d)}.boundingBox{visibility:var(--xModelBoundingBoxVisibility, hidden);transform-style:inherit;position:relative;left:50%;top:50%;width:1px;height:1px;background:#08c}.boundingBox__face{position:absolute;width:1px;height:1px;background:#0c0}.boundingBox__face:nth-child(1){transform:translateZ(-.5px)}.boundingBox__face:nth-child(2){transform:translateZ(.5px)}.boundingBox__face:nth-child(3){transform:translateY(-.5px)rotateX(90deg)}.boundingBox__face:nth-child(4){transform:translateY(.5px)rotateX(-90deg)}.boundingBox__face:nth-child(5){transform:translateX(.5px)rotateY(-90deg)}.boundingBox__face:nth-child(6){transform:translateX(-.5px)rotateY(-90deg)}"}</style>`+"<div class=\"boundingBox\">"+"<div class=\"boundingBox__face\"></div>".repeat(6)+"</div>";let D,E;const F=a=>{a.forEach(a=>{let b=A.get(a.target.parentElement);a.isIntersecting?6>b.axisInView&&(0===b.axisInView&&z.add(b),b.axisInView++):0<b.axisInView&&(b.axisInView--,0===b.axisInView&&z.remove(b))})},G=()=>{D=k.createStylesheet(":root{transform-style:flat!important;}#x-model-renderLayer{position:fixed;top:0;left:0;pointer-events:none}");let a=document.documentElement.firstChild;a.insertBefore(D,a.firstChild);let b=z.init();b.setAttribute("id","x-model-renderLayer"),document.documentElement.appendChild(b),E=new IntersectionObserver(F)};class H extends HTMLElement{constructor(){super(),this.attachShadow({mode:"open"}),this.shadowRoot.innerHTML=C}static get observedAttributes(){return["src","width","height"]}connectedCallback(){D||G();let b=A.get(this);if(b&&b.elem!==this){let c=b.children[0],d=c.userData.size,e=a(this.offsetWidth/d.x,this.offsetHeight/d.y),f=d.x*e,g=d.y*e,h=d.z*e,i=this.shadowRoot.querySelector(".boundingBox");i.style.transform=`translate(-50%,-50%)scale3d(${f},${g},${h})`;let j=Array.from(i.children);j.forEach(a=>E.observe(a)),b.elem=this,b.axisInView=0,A.set(i,b)}}disconnectedCallback(){let a=A.get(this);if(a&&a.elem===this){let b=this.shadowRoot.querySelector(".boundingBox"),c=Array.from(b.children);c.forEach(a=>E.unobserve(a)),a.elem=null}}attributeChangedCallback(a,b,c){if("width"===a||"height"===a){null!==c&&(c+="px");let b=B[a];this.shadowRoot.children[0].sheet.rules[0].style.setProperty(b,c)}else"src"===a&&(this.disconnectedCallback(),g.load(c).then(a=>{let b=new UIEvent("load");this.dispatchEvent(b),A.set(this,a),this.connectedCallback()}).catch(()=>{let a=new UIEvent("error");this.dispatchEvent(a)}))}}let I;var J=a=>new Promise((b,c)=>{return I||(I=new THREE.GLTFLoader),I.load(a,a=>{b(a.scene)},null,()=>{c()})});let K;var L=a=>new Promise((b,c)=>{return K||(K=new THREE.OBJLoader),K.load(a,a=>{b(a)},null,()=>{c()})});if("customElements"in window){if(!("THREE"in window))throw"THREE (threejs.org) is required.";"GLTFLoader"in THREE&&(g.register(".gltf",J),g.register(".glb",J)),"OBJLoader"in THREE&&g.register(".obj",L),customElements.define("x-model",H)}})();
\ No newline at end of file
diff --git a/src/modelLayer.js b/src/modelLayer.js
index ce91b18..2a30d4a 100644
--- a/src/modelLayer.js
+++ b/src/modelLayer.js
@@ -37,6 +37,7 @@ const init = () => {
     alpha: true
   });
 
+  renderer.setPixelRatio(window.devicePixelRatio);
   renderer.setScissorTest(true);
   renderer.setClearColor(0x000000, 0);
   renderer.autoClear = false;