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+/**
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+ * Based on http://www.emagix.net/academic/mscs-project/item/camera-sync-with-css3-and-webgl-threejs
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+ * @author mrdoob / http://mrdoob.com/
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+ * @author yomotsu / https://yomotsu.net/
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+ */
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+
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+THREE.CSS3DObject = function(element) {
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+
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+ THREE.Object3D.call(this);
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+
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+ this.element = element;
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+ this.element.style.position = 'absolute';
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+
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+ this.addEventListener('removed', function() {
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+
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+ if (this.element.parentNode !== null) {
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+
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+ this.element.parentNode.removeChild(this.element);
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+
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+ }
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+
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+ });
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+
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+};
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+
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+THREE.CSS3DObject.prototype = Object.create(THREE.Object3D.prototype);
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+THREE.CSS3DObject.prototype.constructor = THREE.CSS3DObject;
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+
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+THREE.CSS3DSprite = function(element) {
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+
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+ THREE.CSS3DObject.call(this, element);
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+
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+};
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+
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+THREE.CSS3DSprite.prototype = Object.create(THREE.CSS3DObject.prototype);
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+THREE.CSS3DSprite.prototype.constructor = THREE.CSS3DSprite;
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+
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+//
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+
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+THREE.CSS3DRenderer = function() {
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+
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+ console.log('THREE.CSS3DRenderer', THREE.REVISION);
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+
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+ var _width, _height;
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+ var _widthHalf, _heightHalf;
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+
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+ var matrix = new THREE.Matrix4();
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+
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+ var cache = {
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+ camera: { fov: 0, style: '' },
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+ objects: new WeakMap()
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+ };
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+
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+ var domElement = document.createElement('div');
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+ domElement.style.overflow = 'hidden';
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+
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+ this.domElement = domElement;
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+
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+ var cameraElement = document.createElement('div');
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+
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+ cameraElement.style.WebkitTransformStyle = 'preserve-3d';
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+ cameraElement.style.transformStyle = 'preserve-3d';
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+
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+ domElement.appendChild(cameraElement);
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+
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+ var isIE = /Trident/i.test(navigator.userAgent);
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+
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+ this.getSize = function() {
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+
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+ return {
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+ width: _width,
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+ height: _height
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+ };
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+
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+ };
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+
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+ this.setSize = function(width, height) {
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+
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+ _width = width;
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+ _height = height;
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+ _widthHalf = _width / 2;
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+ _heightHalf = _height / 2;
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+
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+ domElement.style.width = width + 'px';
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+ domElement.style.height = height + 'px';
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+
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+ cameraElement.style.width = width + 'px';
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+ cameraElement.style.height = height + 'px';
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+
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+ };
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+
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+ function epsilon(value) {
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+
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+ return Math.abs(value) < 1e-10 ? 0 : value;
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+
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+ }
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+
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+ function getCameraCSSMatrix(matrix) {
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+
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+ var elements = matrix.elements;
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+
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+ return 'matrix3d(' +
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+ epsilon(elements[0]) + ',' +
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+ epsilon(-elements[1]) + ',' +
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+ epsilon(elements[2]) + ',' +
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+ epsilon(elements[3]) + ',' +
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+ epsilon(elements[4]) + ',' +
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+ epsilon(-elements[5]) + ',' +
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+ epsilon(elements[6]) + ',' +
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+ epsilon(elements[7]) + ',' +
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+ epsilon(elements[8]) + ',' +
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+ epsilon(-elements[9]) + ',' +
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+ epsilon(elements[10]) + ',' +
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+ epsilon(elements[11]) + ',' +
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+ epsilon(elements[12]) + ',' +
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+ epsilon(-elements[13]) + ',' +
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+ epsilon(elements[14]) + ',' +
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+ epsilon(elements[15]) +
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+ ')';
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+
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+ }
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+
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+ function getObjectCSSMatrix(matrix, cameraCSSMatrix) {
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+
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+ var elements = matrix.elements;
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+ var matrix3d = 'matrix3d(' +
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+ epsilon(elements[0]) + ',' +
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+ epsilon(elements[1]) + ',' +
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+ epsilon(elements[2]) + ',' +
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+ epsilon(elements[3]) + ',' +
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+ epsilon(-elements[4]) + ',' +
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+ epsilon(-elements[5]) + ',' +
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+ epsilon(-elements[6]) + ',' +
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+ epsilon(-elements[7]) + ',' +
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+ epsilon(elements[8]) + ',' +
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+ epsilon(elements[9]) + ',' +
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+ epsilon(elements[10]) + ',' +
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+ epsilon(elements[11]) + ',' +
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+ epsilon(elements[12]) + ',' +
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+ epsilon(elements[13]) + ',' +
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+ epsilon(elements[14]) + ',' +
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+ epsilon(elements[15]) +
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+ ')';
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+
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+ if (isIE) {
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+
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+ return 'translate(-50%,-50%)' +
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+ 'translate(' + _widthHalf + 'px,' + _heightHalf + 'px)' +
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+ cameraCSSMatrix +
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+ matrix3d;
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+
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+ }
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+
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+ return 'translate(-50%,-50%)' + matrix3d;
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+
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+ }
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+
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+ function renderObject(object, camera, cameraCSSMatrix) {
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+
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+ if (object instanceof THREE.CSS3DObject) {
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+
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+ var style;
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+
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+ if (object instanceof THREE.CSS3DSprite) {
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+
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+ // http://swiftcoder.wordpress.com/2008/11/25/constructing-a-billboard-matrix/
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+
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+ matrix.copy(camera.matrixWorldInverse);
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+ matrix.transpose();
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+ matrix.copyPosition(object.matrixWorld);
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+ matrix.scale(object.scale);
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+
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+ matrix.elements[3] = 0;
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+ matrix.elements[7] = 0;
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+ matrix.elements[11] = 0;
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+ matrix.elements[15] = 1;
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+
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+ style = getObjectCSSMatrix(matrix, cameraCSSMatrix);
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+
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+ } else {
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+
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+ style = getObjectCSSMatrix(object.matrixWorld, cameraCSSMatrix);
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+
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+ }
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+
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+ var element = object.element;
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+ var cachedStyle = cache.objects.get(object);
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+
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+ if (cachedStyle === undefined || cachedStyle !== style) {
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+
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+ element.style.WebkitTransform = style;
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+ element.style.transform = style;
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+
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+ var objectData = { style: style };
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+
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+ if (isIE) {
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+
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+ objectData.distanceToCameraSquared = getDistanceToSquared(camera, object);
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+
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+ }
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+
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+ cache.objects.set(object, objectData);
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+
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+ }
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+
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+ if (element.parentNode !== cameraElement) {
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+
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+ cameraElement.appendChild(element);
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+
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+ }
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+
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+ }
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+
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+ for (var i = 0, l = object.children.length; i < l; i++) {
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+
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+ renderObject(object.children[i], camera, cameraCSSMatrix);
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+
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+ }
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+
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+ }
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+
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+ var getDistanceToSquared = function() {
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+
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+ var a = new THREE.Vector3();
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+ var b = new THREE.Vector3();
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+
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+ return function(object1, object2) {
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+
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+ a.setFromMatrixPosition(object1.matrixWorld);
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+ b.setFromMatrixPosition(object2.matrixWorld);
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+
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+ return a.distanceToSquared(b);
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+
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+ };
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+
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+ }();
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+
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+ function filterAndFlatten(scene) {
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+
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+ var result = [];
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+
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+ scene.traverse(function(object) {
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+
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+ if (object instanceof THREE.CSS3DObject) result.push(object);
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+
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+ });
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+
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+ return result;
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+
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+ }
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+
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+ function zOrder(scene) {
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+
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+ var sorted = filterAndFlatten(scene).sort(function(a, b) {
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+
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+ var distanceA = cache.objects.get(a).distanceToCameraSquared;
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+ var distanceB = cache.objects.get(b).distanceToCameraSquared;
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+
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+ return distanceA - distanceB;
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+
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+ });
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+
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+ var zMax = sorted.length;
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+
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+ for (var i = 0, l = sorted.length; i < l; i++) {
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+
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+ sorted[i].element.style.zIndex = zMax - i;
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+
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+ }
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+
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+ }
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+
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+ this.render = function(scene, camera) {
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+
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+ var fov = camera.projectionMatrix.elements[5] * _heightHalf;
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+
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+ if (cache.camera.fov !== fov) {
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+
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+ if (camera.isPerspectiveCamera) {
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+
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+ domElement.style.WebkitPerspective = fov + 'px';
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+ domElement.style.perspective = fov + 'px';
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+
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+ }
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+
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+ cache.camera.fov = fov;
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+
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+ }
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+
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+ scene.updateMatrixWorld();
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+
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+ if (camera.parent === null) camera.updateMatrixWorld();
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+
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+ var cameraCSSMatrix = camera.isOrthographicCamera ?
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+ 'scale(' + fov + ')' + getCameraCSSMatrix(camera.matrixWorldInverse) :
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+ 'translateZ(' + fov + 'px)' + getCameraCSSMatrix(camera.matrixWorldInverse);
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+
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+ var style = cameraCSSMatrix +
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+ 'translate(' + _widthHalf + 'px,' + _heightHalf + 'px)';
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+
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+ if (cache.camera.style !== style && !isIE) {
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+
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+ cameraElement.style.WebkitTransform = style;
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+ cameraElement.style.transform = style;
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+
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+ cache.camera.style = style;
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+
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+ }
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+
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+ renderObject(scene, camera, cameraCSSMatrix);
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+
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+ if (isIE) {
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+
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+ // IE10 and 11 does not support 'preserve-3d'.
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+ // Thus, z-order in 3D will not work.
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+ // We have to calc z-order manually and set CSS z-index for IE.
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+ // FYI: z-index can't handle object intersection
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+ zOrder(scene);
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+
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+ }
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+
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+ };
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+
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+};
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