javascript
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three.js
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							<!DOCTYPE html>
<html lang="en">

<head>
	<title>three.js vr - handinput - press button</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>	vr - handinput - press button<br />
		(Oculus Browser 15.1+)
	</div>

	<script type="module">

		import * as THREE from '../build/three.module.js';
		import { VRButton } from './jsm/webxr/VRButton.js';
		import { XRControllerModelFactory } from './jsm/webxr/XRControllerModelFactory.js';
		import { OculusHandModel } from './jsm/webxr/OculusHandModel.js';
		import { createText } from './jsm/webxr/Text2D.js';

		import { World, System, Component, TagComponent, Types } from './jsm/libs/ecsy.module.js';

		class Object3D extends Component { }

		Object3D.schema = {
			object: { type: Types.Ref }
		};

		class Button extends Component { }

		Button.schema = {
			// button states: [resting, pressed, fully_pressed, recovering]
			currState: { type: Types.String, default: 'resting' },
			prevState: { type: Types.String, default: 'resting' },
			pressSound: { type: Types.Ref, default: null },
			releaseSound: { type: Types.Ref, default: null },
			restingY: { type: Types.Number, default: null },
			surfaceY: { type: Types.Number, default: null },
			recoverySpeed: { type: Types.Number, default: 0.4 },
			fullPressDistance: { type: Types.Number, default: null },
			action: { type: Types.Ref, default: () => { } }
		};

		class ButtonSystem extends System {

			init( attributes ) {

				this.renderer = attributes.renderer;
				this.soundAdded = false;

			}

			execute( /*delta, time*/ ) {

				let buttonPressSound, buttonReleaseSound;
				if ( this.renderer.xr.getSession() && ! this.soundAdded ) {

					const xrCamera = this.renderer.xr.getCamera( camera );

					const listener = new THREE.AudioListener();
					xrCamera.add( listener );

					// create a global audio source
					buttonPressSound = new THREE.Audio( listener );
					buttonReleaseSound = new THREE.Audio( listener );

					// load a sound and set it as the Audio object's buffer
					const audioLoader = new THREE.AudioLoader();
					audioLoader.load( 'sounds/button-press.ogg', function ( buffer ) {

						buttonPressSound.setBuffer( buffer );

					} );
					audioLoader.load( 'sounds/button-release.ogg', function ( buffer ) {

						buttonReleaseSound.setBuffer( buffer );

					} );
					this.soundAdded = true;

				}

				this.queries.buttons.results.forEach( entity => {

					const button = entity.getMutableComponent( Button );
					const buttonMesh = entity.getComponent( Object3D ).object;
					// populate restingY
					if ( button.restingY == null ) {

						button.restingY = buttonMesh.position.y;

					}

					if ( buttonPressSound ) {

						button.pressSound = buttonPressSound;

					}

					if ( buttonReleaseSound ) {

						button.releaseSound = buttonReleaseSound;

					}

					if ( button.currState == 'fully_pressed' && button.prevState != 'fully_pressed' ) {

						button.pressSound?.play();
						button.action();

					}

					if ( button.currState == 'recovering' && button.prevState != 'recovering' ) {

						button.releaseSound?.play();

					}

					// preserve prevState, clear currState
					// FingerInputSystem will update currState
					button.prevState = button.currState;
					button.currState = 'resting';

				} );

			}

		}

		ButtonSystem.queries = {
			buttons: {
				components: [ Button ]
			}
		};

		class Pressable extends TagComponent { }

		class FingerInputSystem extends System {

			init( attributes ) {

				this.hands = attributes.hands;

			}

			execute( delta/*, time*/ ) {

				this.queries.pressable.results.forEach( entity => {

					const button = entity.getMutableComponent( Button );
					const object = entity.getComponent( Object3D ).object;
					const pressingDistances = [];
					this.hands.forEach( hand => {

						if ( hand && hand.intersectBoxObject( object ) ) {

							const pressingPosition = hand.getPointerPosition();
							pressingDistances.push( button.surfaceY - object.worldToLocal( pressingPosition ).y );

						}

					} );
					if ( pressingDistances.length == 0 ) { // not pressed this frame

						if ( object.position.y < button.restingY ) {

							object.position.y += button.recoverySpeed * delta;
							button.currState = 'recovering';

						} else {

							object.position.y = button.restingY;
							button.currState = 'resting';

						}

					} else {

						button.currState = 'pressed';
						const pressingDistance = Math.max( pressingDistances );
						if ( pressingDistance > 0 ) {

							object.position.y -= pressingDistance;

						}

						if ( object.position.y <= button.restingY - button.fullPressDistance ) {

							button.currState = 'fully_pressed';
							object.position.y = button.restingY - button.fullPressDistance;

						}

					}

				} );

			}

		}

		FingerInputSystem.queries = {
			pressable: {
				components: [ Pressable ]
			}
		};

		class Rotating extends TagComponent { }

		class RotatingSystem extends System {

			execute( delta/*, time*/ ) {

				this.queries.rotatingObjects.results.forEach( entity => {

					const object = entity.getComponent( Object3D ).object;
					object.rotation.x += 0.4 * delta;
					object.rotation.y += 0.4 * delta;

				} );

			}

		}

		RotatingSystem.queries = {
			rotatingObjects: {
				components: [ Rotating ]
			}
		};

		class HandsInstructionText extends TagComponent { }

		class InstructionSystem extends System {

			init( attributes ) {

				this.controllers = attributes.controllers;

			}

			execute( /*delta, time*/ ) {

				let visible = false;
				this.controllers.forEach( controller => {

					if ( controller.visible ) {

						visible = true;

					}

				} );

				this.queries.instructionTexts.results.forEach( entity => {

					const object = entity.getComponent( Object3D ).object;
					object.visible = visible;

				} );

			}

		}

		InstructionSystem.queries = {
			instructionTexts: {
				components: [ HandsInstructionText ]
			}
		};

		class OffsetFromCamera extends Component { }

		OffsetFromCamera.schema = {
			x: { type: Types.Number, default: 0 },
			y: { type: Types.Number, default: 0 },
			z: { type: Types.Number, default: 0 },
		};

		class NeedCalibration extends TagComponent { }

		class CalibrationSystem extends System {

			init( attributes ) {

				this.camera = attributes.camera;
				this.renderer = attributes.renderer;

			}

			execute( /*delta, time*/ ) {

				this.queries.needCalibration.results.forEach( entity => {

					if ( this.renderer.xr.getSession() ) {

						const offset = entity.getComponent( OffsetFromCamera );
						const object = entity.getComponent( Object3D ).object;
						const xrCamera = renderer.xr.getCamera( this.camera );
						object.position.x = xrCamera.position.x + offset.x;
						object.position.y = xrCamera.position.y + offset.y;
						object.position.z = xrCamera.position.z + offset.z;
						entity.removeComponent( NeedCalibration );

					}

				} );

			}

		}

		CalibrationSystem.queries = {
			needCalibration: {
				components: [ NeedCalibration ]
			}
		};

		const world = new World();
		const clock = new THREE.Clock();
		let camera, scene, renderer;

		init();
		animate();

		function makeButtonMesh( x, y, z, color ) {

			const geometry = new THREE.BoxGeometry( x, y, z );
			const material = new THREE.MeshPhongMaterial( { color: color } );
			const buttonMesh = new THREE.Mesh( geometry, material );
			buttonMesh.castShadow = true;
			buttonMesh.receiveShadow = true;
			return buttonMesh;

		}

		function init() {

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

			scene = new THREE.Scene();
			scene.background = new THREE.Color( 0x444444 );

			camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 10 );
			camera.position.set( 0, 1.2, 0.3 );

			scene.add( new THREE.HemisphereLight( 0x808080, 0x606060 ) );

			const light = new THREE.DirectionalLight( 0xffffff );
			light.position.set( 0, 6, 0 );
			light.castShadow = true;
			light.shadow.camera.top = 2;
			light.shadow.camera.bottom = - 2;
			light.shadow.camera.right = 2;
			light.shadow.camera.left = - 2;
			light.shadow.mapSize.set( 4096, 4096 );
			scene.add( light );

			renderer = new THREE.WebGLRenderer( { antialias: true } );
			renderer.setPixelRatio( window.devicePixelRatio );
			renderer.setSize( window.innerWidth, window.innerHeight );
			renderer.outputEncoding = THREE.sRGBEncoding;
			renderer.shadowMap.enabled = true;
			renderer.xr.enabled = true;

			container.appendChild( renderer.domElement );

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

			// controllers
			const controller1 = renderer.xr.getController( 0 );
			scene.add( controller1 );

			const controller2 = renderer.xr.getController( 1 );
			scene.add( controller2 );

			const controllerModelFactory = new XRControllerModelFactory();

			// Hand 1
			const controllerGrip1 = renderer.xr.getControllerGrip( 0 );
			controllerGrip1.add( controllerModelFactory.createControllerModel( controllerGrip1 ) );
			scene.add( controllerGrip1 );

			const hand1 = renderer.xr.getHand( 0 );
			const handModel1 = new OculusHandModel( hand1 );
			hand1.add( handModel1 );
			scene.add( hand1 );

			// Hand 2
			const controllerGrip2 = renderer.xr.getControllerGrip( 1 );
			controllerGrip2.add( controllerModelFactory.createControllerModel( controllerGrip2 ) );
			scene.add( controllerGrip2 );

			const hand2 = renderer.xr.getHand( 1 );
			const handModel2 = new OculusHandModel( hand2 );
			hand2.add( handModel2 );
			scene.add( hand2 );


			// buttons
			const floorGeometry = new THREE.PlaneGeometry( 4, 4 );
			const floorMaterial = new THREE.MeshPhongMaterial( { color: 0x222222 } );
			const floor = new THREE.Mesh( floorGeometry, floorMaterial );
			floor.rotation.x = - Math.PI / 2;
			floor.receiveShadow = true;
			scene.add( floor );

			const consoleGeometry = new THREE.BoxGeometry( 0.5, 0.12, 0.15 );
			const consoleMaterial = new THREE.MeshPhongMaterial( { color: 0x595959 } );
			const consoleMesh = new THREE.Mesh( consoleGeometry, consoleMaterial );
			consoleMesh.position.set( 0, 1, - 0.3 );
			consoleMesh.castShadow = true;
			consoleMesh.receiveShadow = true;
			scene.add( consoleMesh );

			const orangeButton = makeButtonMesh( 0.08, 0.1, 0.08, 0xffd3b5 );
			orangeButton.position.set( - 0.15, 0.04, 0 );
			consoleMesh.add( orangeButton );

			const pinkButton = makeButtonMesh( 0.08, 0.1, 0.08, 0xe84a5f );
			pinkButton.position.set( - 0.05, 0.04, 0 );
			consoleMesh.add( pinkButton );

			const resetButton = makeButtonMesh( 0.08, 0.1, 0.08, 0x355c7d );
			const resetButtonText = createText( 'reset', 0.03 );
			resetButton.add( resetButtonText );
			resetButtonText.rotation.x = - Math.PI / 2;
			resetButtonText.position.set( 0, 0.051, 0 );
			resetButton.position.set( 0.05, 0.04, 0 );
			consoleMesh.add( resetButton );

			const exitButton = makeButtonMesh( 0.08, 0.1, 0.08, 0xff0000 );
			const exitButtonText = createText( 'exit', 0.03 );
			exitButton.add( exitButtonText );
			exitButtonText.rotation.x = - Math.PI / 2;
			exitButtonText.position.set( 0, 0.051, 0 );
			exitButton.position.set( 0.15, 0.04, 0 );
			consoleMesh.add( exitButton );

			const tkGeometry = new THREE.TorusKnotGeometry( 0.5, 0.2, 200, 32 );
			const tkMaterial = new THREE.MeshPhongMaterial( { color: 0xffffff } );
			tkMaterial.metalness = 0.8;
			const torusKnot = new THREE.Mesh( tkGeometry, tkMaterial );
			torusKnot.position.set( 0, 1, - 5 );
			scene.add( torusKnot );

			const instructionText = createText( 'This is a WebXR Hands demo, please explore with hands.', 0.04 );
			instructionText.position.set( 0, 1.6, - 0.6 );
			scene.add( instructionText );

			const exitText = createText( 'Exiting session...', 0.04 );
			exitText.position.set( 0, 1.5, - 0.6 );
			exitText.visible = false;
			scene.add( exitText );

			world
				.registerComponent( Object3D )
				.registerComponent( Button )
				.registerComponent( Pressable )
				.registerComponent( Rotating )
				.registerComponent( HandsInstructionText )
				.registerComponent( OffsetFromCamera )
				.registerComponent( NeedCalibration );

			world
				.registerSystem( RotatingSystem )
				.registerSystem( InstructionSystem, { controllers: [ controllerGrip1, controllerGrip2 ] } )
				.registerSystem( CalibrationSystem, { renderer: renderer, camera: camera } )
				.registerSystem( ButtonSystem, { renderer: renderer, camera: camera } )
				.registerSystem( FingerInputSystem, { hands: [ handModel1, handModel2 ] } );

			const csEntity = world.createEntity();
			csEntity.addComponent( OffsetFromCamera, { x: 0, y: - 0.4, z: - 0.3 } );
			csEntity.addComponent( NeedCalibration );
			csEntity.addComponent( Object3D, { object: consoleMesh } );

			const obEntity = world.createEntity();
			obEntity.addComponent( Pressable );
			obEntity.addComponent( Object3D, { object: orangeButton } );
			const obAction = function () {

				torusKnot.material.color.setHex( 0xffd3b5 );

			};

			obEntity.addComponent( Button, { action: obAction, surfaceY: 0.05, fullPressDistance: 0.02 } );

			const pbEntity = world.createEntity();
			pbEntity.addComponent( Pressable );
			pbEntity.addComponent( Object3D, { object: pinkButton } );
			const pbAction = function () {

				torusKnot.material.color.setHex( 0xe84a5f );

			};

			pbEntity.addComponent( Button, { action: pbAction, surfaceY: 0.05, fullPressDistance: 0.02 } );

			const rbEntity = world.createEntity();
			rbEntity.addComponent( Pressable );
			rbEntity.addComponent( Object3D, { object: resetButton } );
			const rbAction = function () {

				torusKnot.material.color.setHex( 0xffffff );

			};

			rbEntity.addComponent( Button, { action: rbAction, surfaceY: 0.05, fullPressDistance: 0.02 } );

			const ebEntity = world.createEntity();
			ebEntity.addComponent( Pressable );
			ebEntity.addComponent( Object3D, { object: exitButton } );
			const ebAction = function () {

				exitText.visible = true;
				setTimeout( function () {

					exitText.visible = false; renderer.xr.getSession().end();

				}, 2000 );

			};

			ebEntity.addComponent( Button, { action: ebAction, surfaceY: 0.05, recoverySpeed: 0.2, fullPressDistance: 0.03 } );

			const tkEntity = world.createEntity();
			tkEntity.addComponent( Rotating );
			tkEntity.addComponent( Object3D, { object: torusKnot } );

			const itEntity = world.createEntity();
			itEntity.addComponent( HandsInstructionText );
			itEntity.addComponent( Object3D, { object: instructionText } );

			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() {

			const delta = clock.getDelta();
			const elapsedTime = clock.elapsedTime;
			world.execute( delta, elapsedTime );
			renderer.render( scene, camera );

		}

	</script>
</body>

</html>