midas
/
threejs-obj-space


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js ar - hit test</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 - hit test<br/>Enable chrome://flags/#webxr-ar-module<br/>Enable chrome://flags/#webxr-hit-test<br/>(Chrome Android 80+)
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';
			import { ARButton } from './jsm/webxr/ARButton.js';

			var container;
			var camera, scene, renderer;
			var controller;

			var matrix, ray, reticle;

			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 );

				var light = new THREE.HemisphereLight( 0xffffff, 0xbbbbff, 1 );
				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 ) );

				//

				var geometry = new THREE.CylinderBufferGeometry( 0.1, 0.1, 0.2, 32 ).translate( 0, 0.1, 0 );

				function onSelect() {

					if ( reticle.visible ) {

						var material = new THREE.MeshPhongMaterial( { color: 0xffffff * Math.random() } );
						var mesh = new THREE.Mesh( geometry, material );
						mesh.position.setFromMatrixPosition( reticle.matrix );
						mesh.scale.y = Math.random() * 2 + 1;
						scene.add( mesh );

					}

				}

				controller = renderer.xr.getController( 0 );
				controller.addEventListener( 'select', onSelect );
				scene.add( controller );

				matrix = new THREE.Matrix4();

				ray = new THREE.Ray();

				reticle = new THREE.Mesh(
					new THREE.RingBufferGeometry( 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, false );

			}

			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 ) {

					var referenceSpace = renderer.xr.getReferenceSpace();
					var session = renderer.xr.getSession();
					var pose = frame.getViewerPose( referenceSpace );

					if ( pose ) {

						matrix.fromArray( pose.transform.matrix );

						ray.origin.set( 0, 0, 0 );
						ray.direction.set( 0, 0, - 1 );
						ray.applyMatrix4( matrix );

						var xrRay = new XRRay( ray.origin, ray.direction );

						session.requestHitTest( xrRay, referenceSpace )
							.then( function ( results ) {

								if ( results.length ) {

									var hitResult = results[ 0 ];

									reticle.visible = true;
									reticle.matrix.fromArray( hitResult.hitMatrix );

								} else {

									reticle.visible = false;

								}

							} );

					}

				}

				renderer.render( scene, camera );

			}

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