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<title>three.js ar - hit test</title>
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> ar - hit test<br/>(Chrome Android 81+)
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<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.8.0/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 { ARButton } from 'three/addons/webxr/ARButton.js';
let container;
let camera, scene, renderer;
let controller;
let reticle;
let hitTestSource = null;
let hitTestSourceRequested = false;
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 );
const light = new THREE.HemisphereLight( 0xffffff, 0xbbbbff, 3 );
light.position.set( 0.5, 1, 0.25 );
scene.add( light );
//
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, { requiredFeatures: [ 'hit-test' ] } ) );
//
const geometry = new THREE.CylinderGeometry( 0.1, 0.1, 0.2, 32 ).translate( 0, 0.1, 0 );
function onSelect() {
if ( reticle.visible ) {
const material = new THREE.MeshPhongMaterial( { color: 0xffffff * Math.random() } );
const mesh = new THREE.Mesh( geometry, material );
reticle.matrix.decompose( mesh.position, mesh.quaternion, mesh.scale );
mesh.scale.y = Math.random() * 2 + 1;
scene.add( mesh );
}
}
controller = renderer.xr.getController( 0 );
controller.addEventListener( 'select', onSelect );
scene.add( controller );
reticle = new THREE.Mesh(
new THREE.RingGeometry( 0.15, 0.2, 32 ).rotateX( - Math.PI / 2 ),
new THREE.MeshBasicMaterial()
);
reticle.matrixAutoUpdate = false;
reticle.visible = false;
scene.add( reticle );
//
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function animate() {
renderer.setAnimationLoop( render );
}
function render( timestamp, frame ) {
if ( frame ) {
const referenceSpace = renderer.xr.getReferenceSpace();
const session = renderer.xr.getSession();
if ( hitTestSourceRequested === false ) {
session.requestReferenceSpace( 'viewer' ).then( function ( referenceSpace ) {
session.requestHitTestSource( { space: referenceSpace } ).then( function ( source ) {
hitTestSource = source;
} );
} );
session.addEventListener( 'end', function () {
hitTestSourceRequested = false;
hitTestSource = null;
} );
hitTestSourceRequested = true;
}
if ( hitTestSource ) {
const hitTestResults = frame.getHitTestResults( hitTestSource );
if ( hitTestResults.length ) {
const hit = hitTestResults[ 0 ];
reticle.visible = true;
reticle.matrix.fromArray( hit.getPose( referenceSpace ).transform.matrix );
} else {
reticle.visible = false;
}
}
}
renderer.render( scene, camera );
}
</script>
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