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261 lines
7.9 KiB
261 lines
7.9 KiB
<!-- Licensed under a BSD license. See license.html for license -->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Three.js - WebXR - Point to Select w/Move</title>
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<style>
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html, body {
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height: 100%;
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margin: 0;
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}
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#c {
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width: 100%;
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height: 100%;
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display: block;
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}
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</style>
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</head>
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<body>
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<canvas id="c"></canvas>
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</body>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../../build/three.module.js",
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"three/addons/": "../../examples/jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import {VRButton} from 'three/addons/webxr/VRButton.js';
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function main() {
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const canvas = document.querySelector('#c');
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const renderer = new THREE.WebGLRenderer({canvas});
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renderer.xr.enabled = true;
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document.body.appendChild(VRButton.createButton(renderer));
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const fov = 75;
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const aspect = 2; // the canvas default
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const near = 0.1;
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const far = 50;
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const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
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camera.position.set(0, 1.6, 0);
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const scene = new THREE.Scene();
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// object to put pickable objects on so we can easily
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// separate them from non-pickable objects
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const pickRoot = new THREE.Object3D();
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scene.add(pickRoot);
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{
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const loader = new THREE.CubeTextureLoader();
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const texture = loader.load([
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'resources/images/grid-1024.png',
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'resources/images/grid-1024.png',
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'resources/images/grid-1024.png',
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'resources/images/grid-1024.png',
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'resources/images/grid-1024.png',
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'resources/images/grid-1024.png',
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]);
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scene.background = texture;
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}
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{
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const color = 0xFFFFFF;
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const intensity = 1;
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const light = new THREE.DirectionalLight(color, intensity);
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light.position.set(-1, 2, 4);
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scene.add(light);
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}
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const boxWidth = 1;
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const boxHeight = 1;
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const boxDepth = 1;
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const boxGeometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);
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const sphereRadius = 0.5;
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const sphereGeometry = new THREE.SphereGeometry(sphereRadius);
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function makeInstance(geometry, color, x) {
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const material = new THREE.MeshPhongMaterial({color});
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const cube = new THREE.Mesh(geometry, material);
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pickRoot.add(cube);
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cube.position.x = x;
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cube.position.y = 1.6;
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cube.position.z = -2;
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return cube;
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}
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const meshToMeshMap = new Map();
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[
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{ x: 0, boxColor: 0x44aa88, sphereColor: 0xFF4444, },
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{ x: 2, boxColor: 0x8844aa, sphereColor: 0x44FF44, },
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{ x: -2, boxColor: 0xaa8844, sphereColor: 0x4444FF, },
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].forEach((info) => {
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const {x, boxColor, sphereColor} = info;
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const sphere = makeInstance(sphereGeometry, sphereColor, x);
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const box = makeInstance(boxGeometry, boxColor, x);
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// hide the sphere
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sphere.visible = false;
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// map the sphere to the box
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meshToMeshMap.set(box, sphere);
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// map the box to the sphere
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meshToMeshMap.set(sphere, box);
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});
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class ControllerPickHelper extends THREE.EventDispatcher {
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constructor(scene) {
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super();
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this.raycaster = new THREE.Raycaster();
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this.objectToColorMap = new Map();
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this.controllerToObjectMap = new Map();
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this.tempMatrix = new THREE.Matrix4();
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const pointerGeometry = new THREE.BufferGeometry().setFromPoints([
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new THREE.Vector3(0, 0, 0),
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new THREE.Vector3(0, 0, -1),
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]);
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this.controllers = [];
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const selectListener = (event) => {
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const controller = event.target;
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const selectedObject = this.controllerToObjectMap.get(event.target);
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if (selectedObject) {
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this.dispatchEvent({type: event.type, controller, selectedObject});
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}
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};
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const endListener = (event) => {
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const controller = event.target;
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this.dispatchEvent({type: event.type, controller});
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};
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for (let i = 0; i < 2; ++i) {
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const controller = renderer.xr.getController(i);
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controller.addEventListener('select', selectListener);
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controller.addEventListener('selectstart', selectListener);
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controller.addEventListener('selectend', endListener);
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scene.add(controller);
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const line = new THREE.Line(pointerGeometry);
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line.scale.z = 5;
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controller.add(line);
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this.controllers.push({controller, line});
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}
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}
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reset() {
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// restore the colors
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this.objectToColorMap.forEach((color, object) => {
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object.material.emissive.setHex(color);
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});
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this.objectToColorMap.clear();
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this.controllerToObjectMap.clear();
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}
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update(pickablesParent, time) {
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this.reset();
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for (const {controller, line} of this.controllers) {
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// cast a ray through the from the controller
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this.tempMatrix.identity().extractRotation(controller.matrixWorld);
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this.raycaster.ray.origin.setFromMatrixPosition(controller.matrixWorld);
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this.raycaster.ray.direction.set(0, 0, -1).applyMatrix4(this.tempMatrix);
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// get the list of objects the ray intersected
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const intersections = this.raycaster.intersectObjects(pickablesParent.children);
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if (intersections.length) {
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const intersection = intersections[0];
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// make the line touch the object
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line.scale.z = intersection.distance;
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// pick the first object. It's the closest one
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const pickedObject = intersection.object;
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// save which object this controller picked
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this.controllerToObjectMap.set(controller, pickedObject);
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// highlight the object if we haven't already
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if (this.objectToColorMap.get(pickedObject) === undefined) {
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// save its color
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this.objectToColorMap.set(pickedObject, pickedObject.material.emissive.getHex());
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// set its emissive color to flashing red/yellow
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pickedObject.material.emissive.setHex((time * 8) % 2 > 1 ? 0xFF2000 : 0xFF0000);
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}
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} else {
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line.scale.z = 5;
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}
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}
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}
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}
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const controllerToSelection = new Map();
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const pickHelper = new ControllerPickHelper(scene);
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pickHelper.addEventListener('selectstart', (event) => {
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const {controller, selectedObject} = event;
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const existingSelection = controllerToSelection.get(controller);
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if (!existingSelection) {
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controllerToSelection.set(controller, {
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object: selectedObject,
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parent: selectedObject.parent,
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});
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controller.attach(selectedObject);
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}
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});
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pickHelper.addEventListener('selectend', (event) => {
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const {controller} = event;
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const selection = controllerToSelection.get(controller);
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if (selection) {
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controllerToSelection.delete(controller);
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selection.parent.attach(selection.object);
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}
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});
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function resizeRendererToDisplaySize(renderer) {
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const canvas = renderer.domElement;
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const width = canvas.clientWidth;
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const height = canvas.clientHeight;
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const needResize = canvas.width !== width || canvas.height !== height;
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if (needResize) {
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renderer.setSize(width, height, false);
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}
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return needResize;
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}
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function render(time) {
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time *= 0.001;
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if (resizeRendererToDisplaySize(renderer)) {
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const canvas = renderer.domElement;
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camera.aspect = canvas.clientWidth / canvas.clientHeight;
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camera.updateProjectionMatrix();
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}
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let ndx = 0;
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for (const mesh of meshToMeshMap.keys()) {
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const speed = 1 + ndx * .1;
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const rot = time * speed;
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mesh.rotation.x = rot;
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mesh.rotation.y = rot;
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++ndx;
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}
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pickHelper.update(pickRoot, time);
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renderer.render(scene, camera);
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}
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renderer.setAnimationLoop(render);
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}
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main();
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</script>
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</html>
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