examples/webxr_ar_paint.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js ar - paint</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> ar - paint<br/>(Chrome Android 81+)
		</div>

		<!-- Import maps polyfill -->
		<!-- Remove this when import maps will be widely supported -->
		<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';
			import { TubePainter } from 'three/addons/misc/TubePainter.js';
			import { ARButton } from 'three/addons/webxr/ARButton.js';

			let container;
			let camera, scene, renderer;
			let controller, painter;

			const cursor = new THREE.Vector3();

			init();
			animate();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 20 );

				//

				renderer = new THREE.WebGLRenderer( { antialias: true, alpha: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.xr.enabled = true;
				container.appendChild( renderer.domElement );

				//

				document.body.appendChild( ARButton.createButton( renderer ) );

				// model

				const light = new THREE.HemisphereLight( 0xffffff, 0xbbbbff, 1 );
				light.position.set( 0, 1, 0 );
				scene.add( light );

				//

				painter = new TubePainter();
				painter.setSize( 0.4 );
				painter.mesh.material.side = THREE.DoubleSide;
				scene.add( painter.mesh );

				//

				function onSelectStart() {

					this.userData.isSelecting = true;
					this.userData.skipFrames = 2;

				}

				function onSelectEnd() {

					this.userData.isSelecting = false;

				}

				controller = renderer.xr.getController( 0 );
				controller.addEventListener( 'selectstart', onSelectStart );
				controller.addEventListener( 'selectend', onSelectEnd );
				controller.userData.skipFrames = 0;
				scene.add( controller );

				//

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			//

			function handleController( controller ) {

				const userData = controller.userData;

				cursor.set( 0, 0, - 0.2 ).applyMatrix4( controller.matrixWorld );

				if ( userData.isSelecting === true ) {

					if ( userData.skipFrames >= 0 ) {

						// TODO(mrdoob) Revisit this

						userData.skipFrames --;

						painter.moveTo( cursor );

					} else {

						painter.lineTo( cursor );
						painter.update();

					}

				}

			}

			function animate() {

				renderer.setAnimationLoop( render );

			}

			function render() {

				handleController( controller );

				renderer.render( scene, camera );

			}

		</script>
	</body>
</html>