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- <!-- Licensed under a BSD license. See license.html for license -->
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
- <title>Three.js - WebXR - Point to Select</title>
- <style>
- html, body {
- height: 100%;
- margin: 0;
- }
- #c {
- width: 100%;
- height: 100%;
- display: block;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- </body>
- <script type="importmap">
- {
- "imports": {
- "three": "../../build/three.module.js",
- "three/addons/": "../../examples/jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { VRButton } from 'three/addons/webxr/VRButton.js';
- function main() {
- const canvas = document.querySelector( '#c' );
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
- renderer.xr.enabled = true;
- document.body.appendChild( VRButton.createButton( renderer ) );
- const fov = 75;
- const aspect = 2; // the canvas default
- const near = 0.1;
- const far = 50;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.set( 0, 1.6, 0 );
- const scene = new THREE.Scene();
- // object to put pickable objects on so we can easily
- // separate them from non-pickable objects
- const pickRoot = new THREE.Object3D();
- scene.add( pickRoot );
- {
- const loader = new THREE.CubeTextureLoader();
- const texture = loader.load( [
- 'resources/images/grid-1024.png',
- 'resources/images/grid-1024.png',
- 'resources/images/grid-1024.png',
- 'resources/images/grid-1024.png',
- 'resources/images/grid-1024.png',
- 'resources/images/grid-1024.png',
- ] );
- scene.background = texture;
- }
- {
- const color = 0xFFFFFF;
- const intensity = 3;
- const light = new THREE.DirectionalLight( color, intensity );
- light.position.set( - 1, 2, 4 );
- scene.add( light );
- }
- const boxWidth = 1;
- const boxHeight = 1;
- const boxDepth = 1;
- const boxGeometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
- const sphereRadius = 0.5;
- const sphereGeometry = new THREE.SphereGeometry( sphereRadius );
- function makeInstance( geometry, color, x ) {
- const material = new THREE.MeshPhongMaterial( { color } );
- const cube = new THREE.Mesh( geometry, material );
- pickRoot.add( cube );
- cube.position.x = x;
- cube.position.y = 1.6;
- cube.position.z = - 2;
- return cube;
- }
- const meshToMeshMap = new Map();
- [
- { x: 0, boxColor: 0x44aa88, sphereColor: 0xFF4444, },
- { x: 2, boxColor: 0x8844aa, sphereColor: 0x44FF44, },
- { x: - 2, boxColor: 0xaa8844, sphereColor: 0x4444FF, },
- ].forEach( ( info ) => {
- const { x, boxColor, sphereColor } = info;
- const sphere = makeInstance( sphereGeometry, sphereColor, x );
- const box = makeInstance( boxGeometry, boxColor, x );
- // hide the sphere
- sphere.visible = false;
- // map the sphere to the box
- meshToMeshMap.set( box, sphere );
- // map the box to the sphere
- meshToMeshMap.set( sphere, box );
- } );
- class ControllerPickHelper extends THREE.EventDispatcher {
- constructor( scene ) {
- super();
- this.raycaster = new THREE.Raycaster();
- this.objectToColorMap = new Map();
- this.controllerToObjectMap = new Map();
- const pointerGeometry = new THREE.BufferGeometry().setFromPoints( [
- new THREE.Vector3( 0, 0, 0 ),
- new THREE.Vector3( 0, 0, - 1 ),
- ] );
- this.controllers = [];
- for ( let i = 0; i < 2; ++ i ) {
- const controller = renderer.xr.getController( i );
- controller.addEventListener( 'select', ( event ) => {
- const controller = event.target;
- const selectedObject = this.controllerToObjectMap.get( controller );
- if ( selectedObject ) {
- this.dispatchEvent( { type: 'select', controller, selectedObject } );
- }
- } );
- scene.add( controller );
- const line = new THREE.Line( pointerGeometry );
- line.scale.z = 5;
- controller.add( line );
- this.controllers.push( { controller, line } );
- }
- }
- reset() {
- // restore the colors
- this.objectToColorMap.forEach( ( color, object ) => {
- object.material.emissive.setHex( color );
- } );
- this.objectToColorMap.clear();
- this.controllerToObjectMap.clear();
- }
- update( pickablesParent, time ) {
- this.reset();
- for ( const { controller, line } of this.controllers ) {
- // cast a ray through the from the controller
- this.raycaster.setFromXRController( controller );
- // get the list of objects the ray intersected
- const intersections = this.raycaster.intersectObjects( pickablesParent.children );
- if ( intersections.length ) {
- const intersection = intersections[ 0 ];
- // make the line touch the object
- line.scale.z = intersection.distance;
- // pick the first object. It's the closest one
- const pickedObject = intersection.object;
- // save which object this controller picked
- this.controllerToObjectMap.set( controller, pickedObject );
- // highlight the object if we haven't already
- if ( this.objectToColorMap.get( pickedObject ) === undefined ) {
- // save its color
- this.objectToColorMap.set( pickedObject, pickedObject.material.emissive.getHex() );
- // set its emissive color to flashing red/yellow
- pickedObject.material.emissive.setHex( ( time * 8 ) % 2 > 1 ? 0xFF2000 : 0xFF0000 );
- }
- } else {
- line.scale.z = 5;
- }
- }
- }
- }
- const pickHelper = new ControllerPickHelper( scene );
- pickHelper.addEventListener( 'select', ( event ) => {
- event.selectedObject.visible = false;
- const partnerObject = meshToMeshMap.get( event.selectedObject );
- partnerObject.visible = true;
- } );
- function resizeRendererToDisplaySize( renderer ) {
- const canvas = renderer.domElement;
- const width = canvas.clientWidth;
- const height = canvas.clientHeight;
- const needResize = canvas.width !== width || canvas.height !== height;
- if ( needResize ) {
- renderer.setSize( width, height, false );
- }
- return needResize;
- }
- function render( time ) {
- time *= 0.001;
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const canvas = renderer.domElement;
- camera.aspect = canvas.clientWidth / canvas.clientHeight;
- camera.updateProjectionMatrix();
- }
- let ndx = 0;
- for ( const mesh of meshToMeshMap.keys() ) {
- const speed = 1 + ndx * .1;
- const rot = time * speed;
- mesh.rotation.x = rot;
- mesh.rotation.y = rot;
- ++ ndx;
- }
- pickHelper.update( pickRoot, time );
- renderer.render( scene, camera );
- }
- renderer.setAnimationLoop( render );
- }
- main();
- </script>
- </html>
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