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206 lines
5.9 KiB
206 lines
5.9 KiB
<!-- 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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html, body {
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height: 100%;
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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: 100%;
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height: 100%;
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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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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../../build/three.module.js",
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"three/addons/": "../../examples/jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import {OrbitControls} from 'three/addons/controls/OrbitControls.js';
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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});
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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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const controls = new OrbitControls(camera, canvas);
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controls.target.set(0, 0, 0);
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controls.update();
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const scene = new THREE.Scene();
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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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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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const labelContainerElem = document.querySelector('#labels');
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function makeInstance(geometry, color, x, name) {
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const material = new THREE.MeshPhongMaterial({color});
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const cube = new THREE.Mesh(geometry, material);
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scene.add(cube);
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cube.position.x = x;
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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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return {cube, elem};
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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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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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const tempV = new THREE.Vector3();
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const raycaster = new THREE.Raycaster();
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function render(time) {
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time *= 0.001;
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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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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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// 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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// 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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// 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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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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// 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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// 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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// 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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renderer.render(scene, camera);
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requestAnimationFrame(render);
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}
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requestAnimationFrame(render);
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}
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main();
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</script>
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</html>
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