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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 - Background CSS</title>
- <style>
- html, body {
- height: 100%;
- margin: 0;
- }
- #c {
- width: 100%;
- height: 100%;
- display: block;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- </body>
- <script type="importmap">
- {
- "imports": {
- "three": "../../build/three.module.js"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- function main() {
- const canvas = document.querySelector( '#c' );
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
- renderer.autoClearColor = false;
- const fov = 75;
- const aspect = 2; // the canvas default
- const near = 0.1;
- const far = 5;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.z = 2;
- const scene = new THREE.Scene();
- {
- const color = 0xFFFFFF;
- const intensity = 3;
- const light = new THREE.DirectionalLight( color, intensity );
- light.position.set( - 1, 2, 4 );
- scene.add( light );
- }
- const boxWidth = 1;
- const boxHeight = 1;
- const boxDepth = 1;
- const geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
- function makeInstance( geometry, color, x ) {
- const material = new THREE.MeshPhongMaterial( { color } );
- const cube = new THREE.Mesh( geometry, material );
- scene.add( cube );
- cube.position.x = x;
- return cube;
- }
- const cubes = [
- makeInstance( geometry, 0x44aa88, 0 ),
- makeInstance( geometry, 0x8844aa, - 2 ),
- makeInstance( geometry, 0xaa8844, 2 ),
- ];
- const bgCamera = new THREE.OrthographicCamera(
- - 1, // left
- 1, // right
- 1, // top
- - 1, // bottom
- - 1, // near,
- 1, // far
- );
- const bgScene = new THREE.Scene();
- const loader = new THREE.TextureLoader();
- const bgTexture = loader.load( 'resources/images/daikanyama.jpg' );
- let bgMesh;
- {
- const plane = new THREE.PlaneGeometry( 2, 2 );
- const material = new THREE.MeshBasicMaterial( {
- map: bgTexture,
- depthTest: false,
- } );
- bgMesh = new THREE.Mesh( plane, material );
- bgScene.add( bgMesh );
- }
- 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;
- }
- function render( time ) {
- time *= 0.001;
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const canvas = renderer.domElement;
- camera.aspect = canvas.clientWidth / canvas.clientHeight;
- camera.updateProjectionMatrix();
- }
- // Scale the background plane to cover and keep the image's aspect correct.
- // Note the image may not have loaded yet.
- const canvasAspect = canvas.clientWidth / canvas.clientHeight;
- const imageAspect = bgTexture.image ? bgTexture.image.width / bgTexture.image.height : 1;
- const aspect = imageAspect / canvasAspect;
- // choose an axis to have a scale of 1 and the other >= 1
- bgMesh.scale.x = aspect > 1 ? aspect : 1;
- bgMesh.scale.y = aspect > 1 ? 1 : 1 / aspect;
- cubes.forEach( ( cube, ndx ) => {
- const speed = 1 + ndx * .1;
- const rot = time * speed;
- cube.rotation.x = rot;
- cube.rotation.y = rot;
- } );
- renderer.render( bgScene, bgCamera );
- renderer.render( scene, camera );
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- }
- main();
- </script>
- </html>
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