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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js ar - camera access</title>
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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=no">
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+ <link type="text/css" rel="stylesheet" href="main.css">
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+ </head>
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+ <body>
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+
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> ar - camera access<br/>
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+ </div>
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+
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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/": "./jsm/"
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+ }
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+ }
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+ </script>
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+
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+ <script type="module">
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+
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+ import * as THREE from 'three';
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+ import { ARButton } from 'three/addons/webxr/ARButton.js';
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+
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+ const clock = new THREE.Clock();
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+
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+ let camera, scene, renderer;
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+ let cube;
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+
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+ init();
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+
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+ async function init() {
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+
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+ const container = document.createElement( 'div' );
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+ document.body.appendChild( container );
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+
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+ scene = new THREE.Scene();
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+
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+ camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 20 );
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+
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+ const defaultLight = new THREE.HemisphereLight( 0xffffff, 0xbbbbff, 3 );
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+ defaultLight.position.set( 0.5, 1, 0.25 );
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+ scene.add( defaultLight );
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+
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+ //
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: true, alpha: true } );
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ renderer.setAnimationLoop( animate );
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+ renderer.xr.enabled = true;
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+ container.appendChild( renderer.domElement );
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+
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+ //
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+
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+ document.body.appendChild( ARButton.createButton( renderer, { requiredFeatures: [ 'camera-access' ] } ) );
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+
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+ //
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+
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+ const boxGeometry = new THREE.BoxGeometry( 1, 1, 1 );
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+ const boxMaterial = new THREE.MeshStandardMaterial();
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+ cube = new THREE.Mesh( boxGeometry, boxMaterial );
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+ cube.position.z = -3;
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+
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+ scene.add( cube );
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+
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+ //
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+
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+ window.addEventListener( 'resize', onWindowResize );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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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 setCameraTexture() {
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+
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+ if ( ! renderer.xr.getSession() ) {
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+
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+ if ( cube.material.map ) {
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+
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+ cube.material.map = null;
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+ cube.material.needsUpdate = true;
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+
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+ }
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+
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+ return;
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+
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+ }
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+
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+ const frame = renderer.xr.getFrame();
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+ const referenceSpace = renderer.xr.getReferenceSpace();
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+
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+ if ( !frame || !referenceSpace ) return;
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+
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+ const viewerPose = frame.getViewerPose( referenceSpace );
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+
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+ if ( ! viewerPose ) return;
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+
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+ const view = viewerPose.views.find( view => view.camera );
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+
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+ const cameraTexture = renderer.xr.getCameraTexture( view.camera );
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+
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+ if ( cube.material.map === cameraTexture ) return;
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+
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+ cube.material.map = cameraTexture;
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+ cube.material.needsUpdate = true;
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+
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+ }
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+
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+ function animate() {
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+
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+ const delta = clock.getDelta();
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+
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+ setCameraTexture();
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+
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+ cube.rotation.x += delta;
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+ cube.rotation.y += delta;
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+
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ </script>
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+ </body>
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+</html>
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Mike Nisbet
