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- <!-- Licensed under a BSD license. See license.html for license -->
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
- <title>Three.js - Multiple Scenes - Controls</title>
- <style>
- #c {
- position: absolute;
- left: 0;
- top: 0;
- width: 100%;
- height: 100%;
- display: block;
- z-index: -1;
- }
- *[data-diagram] {
- display: inline-block;
- width: 5em;
- height: 3em;
- }
- .left {
- float: left;
- margin-right: .25em;
- }
- .right {
- float: right;
- margin-left: .25em;
- }
- p {
- margin: 1em auto;
- max-width: 500px;
- font-size: xx-large;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- <p>
- <span data-diagram="box" class="left"></span>
- I love boxes. Presents come in boxes.
- When I find a new box I'm always excited to find out what's inside.
- </p>
- <p>
- <span data-diagram="pyramid" class="right"></span>
- When I was a kid I dreamed of going on an expedition inside a pyramid
- and finding a undiscovered tomb full of mummies and treasure.
- </p>
- </body>
- <script type="importmap">
- {
- "imports": {
- "three": "../../build/three.module.js",
- "three/addons/": "../../examples/jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { TrackballControls } from 'three/addons/controls/TrackballControls.js';
- function main() {
- const canvas = document.querySelector( '#c' );
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas, alpha: true } );
- const sceneElements = [];
- function addScene( elem, fn ) {
- sceneElements.push( { elem, fn } );
- }
- function makeScene( elem ) {
- const scene = new THREE.Scene();
- const fov = 45;
- const aspect = 2; // the canvas default
- const near = 0.1;
- const far = 5;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.set( 0, 1, 2 );
- camera.lookAt( 0, 0, 0 );
- scene.add( camera );
- const controls = new TrackballControls( camera, elem );
- controls.noZoom = true;
- controls.noPan = true;
- {
- const color = 0xFFFFFF;
- const intensity = 3;
- const light = new THREE.DirectionalLight( color, intensity );
- light.position.set( - 1, 2, 4 );
- camera.add( light );
- }
- return { scene, camera, controls };
- }
- const sceneInitFunctionsByName = {
- 'box': ( elem ) => {
- const { scene, camera, controls } = makeScene( elem );
- const geometry = new THREE.BoxGeometry( 1, 1, 1 );
- const material = new THREE.MeshPhongMaterial( { color: 'red' } );
- const mesh = new THREE.Mesh( geometry, material );
- scene.add( mesh );
- return ( time, rect ) => {
- mesh.rotation.y = time * .1;
- camera.aspect = rect.width / rect.height;
- camera.updateProjectionMatrix();
- controls.handleResize();
- controls.update();
- renderer.render( scene, camera );
- };
- },
- 'pyramid': ( elem ) => {
- const { scene, camera, controls } = makeScene( elem );
- const radius = .8;
- const widthSegments = 4;
- const heightSegments = 2;
- const geometry = new THREE.SphereGeometry( radius, widthSegments, heightSegments );
- const material = new THREE.MeshPhongMaterial( {
- color: 'blue',
- flatShading: true,
- } );
- const mesh = new THREE.Mesh( geometry, material );
- scene.add( mesh );
- return ( time, rect ) => {
- mesh.rotation.y = time * .1;
- camera.aspect = rect.width / rect.height;
- camera.updateProjectionMatrix();
- controls.handleResize();
- controls.update();
- renderer.render( scene, camera );
- };
- },
- };
- document.querySelectorAll( '[data-diagram]' ).forEach( ( elem ) => {
- const sceneName = elem.dataset.diagram;
- const sceneInitFunction = sceneInitFunctionsByName[ sceneName ];
- const sceneRenderFunction = sceneInitFunction( elem );
- addScene( elem, sceneRenderFunction );
- } );
- function resizeRendererToDisplaySize( renderer ) {
- const canvas = renderer.domElement;
- const width = canvas.clientWidth;
- const height = canvas.clientHeight;
- const needResize = canvas.width !== width || canvas.height !== height;
- if ( needResize ) {
- renderer.setSize( width, height, false );
- }
- return needResize;
- }
- const clearColor = new THREE.Color( '#000' );
- function render( time ) {
- time *= 0.001;
- resizeRendererToDisplaySize( renderer );
- renderer.setScissorTest( false );
- renderer.setClearColor( clearColor, 0 );
- renderer.clear( true, true );
- renderer.setScissorTest( true );
- const transform = `translateY(${window.scrollY}px)`;
- renderer.domElement.style.transform = transform;
- for ( const { elem, fn } of sceneElements ) {
- // get the viewport relative position of this element
- const rect = elem.getBoundingClientRect();
- const { left, right, top, bottom, width, height } = rect;
- const isOffscreen =
- bottom < 0 ||
- top > renderer.domElement.clientHeight ||
- right < 0 ||
- left > renderer.domElement.clientWidth;
- if ( ! isOffscreen ) {
- const positiveYUpBottom = renderer.domElement.clientHeight - bottom;
- renderer.setScissor( left, positiveYUpBottom, width, height );
- renderer.setViewport( left, positiveYUpBottom, width, height );
- fn( time, rect );
- }
- }
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- }
- main();
- </script>
- </html>
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