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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 - hit test</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 - hit test<br/>Enable chrome://flags/#webxr-ar-module<br/>Enable chrome://flags/#webxr-hit-test<br/>(Chrome 80+)
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+ </div>
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+
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+ <script type="module">
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+
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+ import * as THREE from '../build/three.module.js';
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+ import { ARButton } from './jsm/webxr/ARButton.js';
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+
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+ var container;
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+ var camera, scene, renderer;
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+ var controller;
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+
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+ var matrix, ray, reticle;
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+
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+ init();
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+ animate();
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+
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+ function init() {
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+
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+ 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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+ var light = new THREE.HemisphereLight( 0xffffff, 0xbbbbff, 1 );
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+ light.position.set( 0.5, 1, 0.25 );
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+ scene.add( light );
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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.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 ) );
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+
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+ //
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+
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+ function onSelect() {
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+
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+ if ( reticle.visible ) {
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+
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+ var geometry = new THREE.BoxBufferGeometry( 0.2, 0.2, 0.2 ).translate( 0, 0.1, 0 );
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+ var material = new THREE.MeshPhongMaterial( { color: 0xffffff * Math.random() } );
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+ var mesh = new THREE.Mesh( geometry, material );
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+ mesh.position.setFromMatrixPosition( reticle.matrix );
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+ scene.add( mesh );
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+
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+ }
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+
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+ }
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+
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+ controller = renderer.xr.getController( 0 );
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+ controller.addEventListener( 'select', onSelect );
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+ scene.add( controller );
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+
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+ matrix = new THREE.Matrix4();
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+
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+ ray = new THREE.Ray();
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+
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+ var geometry = new THREE.RingBufferGeometry( 0.15, 0.2, 32 ).rotateX( - Math.PI / 2 );
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+ var material = new THREE.MeshBasicMaterial();
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+
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+ reticle = new THREE.Mesh( geometry, material );
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+ reticle.matrixAutoUpdate = false;
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+ reticle.visible = false;
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+ scene.add( reticle );
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+
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+ //
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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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 animate() {
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+
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+ renderer.setAnimationLoop( render );
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+
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+ }
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+
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+ function render( timestamp, frame ) {
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+
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+ if ( frame ) {
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+
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+ var referenceSpace = renderer.xr.getReferenceSpace();
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+ var session = renderer.xr.getSession();
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+ var pose = frame.getViewerPose( referenceSpace );
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+
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+ if ( pose ) {
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+
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+ matrix.fromArray( pose.transform.matrix );
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+
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+ ray.origin.set( 0, 0, 0 );
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+ ray.direction.set( 0, 0, - 1 );
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+ ray.applyMatrix4( matrix );
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+
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+ var xrRay = new XRRay( ray.origin, ray.direction );
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+
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+ session.requestHitTest( xrRay, referenceSpace )
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+ .then( function ( results ) {
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+
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+ if ( results.length ) {
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+
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+ var hitResult = results[ 0 ];
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+
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+ reticle.visible = true;
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+ reticle.matrix.fromArray( hitResult.hitMatrix );
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+
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+ } else {
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+
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+ reticle.visible = false;
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+
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+ }
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+
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+ } );
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+
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+ }
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+
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+ }
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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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Mr.doob