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+<!-- Licensed under a BSD license. See license.html for license -->
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+<!DOCTYPE html>
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+<html>
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+ <head>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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+ <title>Three.js - Align HTML Elements w/hiding</title>
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+ <style>
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+ body {
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+ margin: 0;
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+ }
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+ #c {
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+ width: 100%; /* let our container decide our size */
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+ height: 100%;
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+ display: block;
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+ }
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+ #container {
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+ position: relative; /* makes this the origin of its children */
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+ width: 100vw;
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+ height: 100vh;
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+ overflow: hidden;
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+ }
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+ #labels {
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+ position: absolute; /* let us position ourself inside the container */
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+ z-index: 0; /* make a new stacking context so children don't sort with rest of page */
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+ left: 0; /* make our position the top left of the container */
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+ top: 0;
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+ color: white;
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+ }
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+ #labels>div {
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+ white-space: nowrap;
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+ position: absolute; /* let us position them inside the container */
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+ left: 0; /* make their default position the top left of the container */
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+ top: 0;
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+ cursor: pointer; /* change the cursor to a hand when over us */
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+ font-size: large;
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+ user-select: none; /* don't let the text get selected */
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+ text-shadow: /* create a black outline */
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+ -1px -1px 0 #000,
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+ 0 -1px 0 #000,
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+ 1px -1px 0 #000,
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+ 1px 0 0 #000,
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+ 1px 1px 0 #000,
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+ 0 1px 0 #000,
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+ -1px 1px 0 #000,
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+ -1px 0 0 #000;
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+ }
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+ #labels>div:hover {
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+ color: red;
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+ }
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+ </style>
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+ </head>
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+ <body>
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+ <div id="container">
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+ <canvas id="c"></canvas>
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+ <div id="labels"></div>
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+ </div>
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+ </body>
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+<script src="resources/threejs/r102/three.min.js"></script>
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+<script src="resources/threejs/r102/js/controls/OrbitControls.js"></script>
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+<script>
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+'use strict';
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+
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+/* global THREE */
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+
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+function main() {
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+ const canvas = document.querySelector('#c');
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+ const renderer = new THREE.WebGLRenderer({canvas: canvas});
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+
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+ const fov = 75;
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+ const aspect = 2; // the canvas default
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+ const near = 1.1;
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+ const far = 20;
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+ const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
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+ camera.position.z = 7;
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+
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+ const controls = new THREE.OrbitControls(camera, canvas);
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+ controls.target.set(0, 0, 0);
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+ controls.update();
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+
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+ const scene = new THREE.Scene();
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+
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+ {
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+ const color = 0xFFFFFF;
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+ const intensity = 1;
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+ const light = new THREE.DirectionalLight(color, intensity);
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+ light.position.set(-1, 2, 4);
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+ scene.add(light);
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+ }
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+
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+ const boxWidth = 1;
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+ const boxHeight = 1;
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+ const boxDepth = 1;
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+ const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);
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+
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+ const labelContainerElem = document.querySelector('#labels');
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+
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+ function makeInstance(geometry, color, x, name) {
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+ const material = new THREE.MeshPhongMaterial({color});
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+
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+ const cube = new THREE.Mesh(geometry, material);
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+ scene.add(cube);
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+
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+ cube.position.x = x;
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+
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+ const elem = document.createElement('div');
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+ elem.textContent = name;
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+ labelContainerElem.appendChild(elem);
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+
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+ return {cube, elem};
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+ }
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+
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+ const cubes = [
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+ makeInstance(geometry, 0x44aa88, 0, 'Aqua Colored Box'),
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+ makeInstance(geometry, 0x8844aa, -2, 'Purple Colored Box'),
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+ makeInstance(geometry, 0xaa8844, 2, 'Gold Colored Box'),
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+ ];
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+
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+ function resizeRendererToDisplaySize(renderer) {
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+ const canvas = renderer.domElement;
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+ const width = canvas.clientWidth;
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+ const height = canvas.clientHeight;
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+ const needResize = canvas.width !== width || canvas.height !== height;
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+ if (needResize) {
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+ renderer.setSize(width, height, false);
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+ }
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+ return needResize;
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+ }
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+
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+ const tempV = new THREE.Vector3();
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+ const raycaster = new THREE.Raycaster();
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+
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+ function render(time) {
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+ time *= 0.001;
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+
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+ if (resizeRendererToDisplaySize(renderer)) {
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+ const canvas = renderer.domElement;
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+ camera.aspect = canvas.clientWidth / canvas.clientHeight;
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+ camera.updateProjectionMatrix();
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+ }
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+
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+ cubes.forEach((cubeInfo, ndx) => {
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+ const {cube, elem} = cubeInfo;
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+ const speed = 1 + ndx * .1;
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+ const rot = time * speed;
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+ cube.rotation.x = rot;
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+ cube.rotation.y = rot;
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+
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+ // get the position of the center of the cube
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+ cube.updateWorldMatrix(true, false);
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+ cube.getWorldPosition(tempV);
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+
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+ // get the normalized screen coordinate of that position
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+ // x and y will be in the -1 to +1 range with x = -1 being
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+ // on the left and y = -1 being on the bottom
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+ tempV.project(camera);
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+
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+ // ask the raycaster for all the objects that intersect
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+ // from the eye toward this object's position
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+ raycaster.setFromCamera(tempV, camera);
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+ const intersectedObjects = raycaster.intersectObjects(scene.children);
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+ // We're visible if the first intersection is this object.
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+ const show = intersectedObjects.length && cube === intersectedObjects[0].object;
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+
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+ if (!show || Math.abs(tempV.z) > 1) {
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+ // hide the label
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+ elem.style.display = 'none';
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+ } else {
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+ // unhide the label
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+ elem.style.display = '';
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+
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+ // convert the normalized position to CSS coordinates
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+ const x = (tempV.x * .5 + .5) * canvas.clientWidth;
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+ const y = (tempV.y * -.5 + .5) * canvas.clientHeight;
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+
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+ // move the elem to that position
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+ elem.style.transform = `translate(-50%, -50%) translate(${x}px,${y}px)`;
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+
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+ // set the zIndex for sorting
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+ elem.style.zIndex = (-tempV.z * .5 + .5) * 100000 | 0;
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+ }
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+ });
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+
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+ renderer.render(scene, camera);
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+
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+ requestAnimationFrame(render);
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+ }
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+
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+ requestAnimationFrame(render);
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+}
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+
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+main();
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+</script>
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+</html>
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+
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Gregg Tavares
