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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 - Look to Select w/cursor</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();
- {
- 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 );
- }
- function makeDataTexture( data, width, height ) {
- const texture = new THREE.DataTexture( data, width, height, THREE.RGBAFormat );
- texture.minFilter = THREE.NearestFilter;
- texture.magFilter = THREE.NearestFilter;
- texture.needsUpdate = true;
- return texture;
- }
- 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 );
- scene.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 PickHelper {
- constructor( camera ) {
- this.raycaster = new THREE.Raycaster();
- this.pickedObject = null;
- this.pickedObjectSavedColor = 0;
- const cursorColors = new Uint8Array( [
- 64, 64, 64, 64, // dark gray
- 255, 255, 255, 255, // white
- ] );
- this.cursorTexture = makeDataTexture( cursorColors, 2, 1 );
- const ringRadius = 0.4;
- const tubeRadius = 0.1;
- const tubeSegments = 4;
- const ringSegments = 64;
- const cursorGeometry = new THREE.TorusGeometry(
- ringRadius, tubeRadius, tubeSegments, ringSegments );
- const cursorMaterial = new THREE.MeshBasicMaterial( {
- color: 'white',
- map: this.cursorTexture,
- transparent: true,
- blending: THREE.CustomBlending,
- blendSrc: THREE.OneMinusDstColorFactor,
- blendDst: THREE.OneMinusSrcColorFactor,
- } );
- const cursor = new THREE.Mesh( cursorGeometry, cursorMaterial );
- camera.add( cursor );
- cursor.position.z = - 1;
- const scale = 0.05;
- cursor.scale.set( scale, scale, scale );
- this.cursor = cursor;
- this.selectTimer = 0;
- this.selectDuration = 2;
- this.lastTime = 0;
- }
- pick( normalizedPosition, scene, camera, time ) {
- const elapsedTime = time - this.lastTime;
- this.lastTime = time;
- const lastPickedObject = this.pickedObject;
- // restore the color if there is a picked object
- if ( this.pickedObject ) {
- this.pickedObject = undefined;
- }
- // cast a ray through the frustum
- this.raycaster.setFromCamera( normalizedPosition, camera );
- // get the list of objects the ray intersected
- const intersectedObjects = this.raycaster.intersectObjects( scene.children );
- if ( intersectedObjects.length ) {
- // pick the first object. It's the closest one
- this.pickedObject = intersectedObjects[ 0 ].object;
- }
- // show or hide cursor
- this.cursor.visible = this.pickedObject ? true : false;
- let selected = false;
- // if we're looking at the same object as before
- // increment time select timer
- if ( this.pickedObject && lastPickedObject === this.pickedObject ) {
- this.selectTimer += elapsedTime;
- if ( this.selectTimer >= this.selectDuration ) {
- this.selectTimer = 0;
- selected = true;
- }
- } else {
- this.selectTimer = 0;
- }
- // set cursor material to show the timer state
- const fromStart = 0;
- const fromEnd = this.selectDuration;
- const toStart = - 0.5;
- const toEnd = 0.5;
- this.cursorTexture.offset.x = THREE.MathUtils.mapLinear(
- this.selectTimer,
- fromStart, fromEnd,
- toStart, toEnd );
- return selected ? this.pickedObject : undefined;
- }
- }
- const pickHelper = new PickHelper( camera );
- scene.add( camera );
- 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;
- }
- // 0, 0 is the center of the view in normalized coordinates.
- const selectedObject = pickHelper.pick( { x: 0, y: 0 }, scene, camera, time );
- if ( selectedObject ) {
- selectedObject.visible = false;
- const partnerObject = meshToMeshMap.get( selectedObject );
- partnerObject.visible = true;
- }
- renderer.render( scene, camera );
- }
- renderer.setAnimationLoop( render );
- }
- main();
- </script>
- </html>
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