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- import * as THREE from 'https://cdn.skypack.dev/three@0.136.0/build/three.module.js';
- import { OrbitControls } from 'https://cdn.skypack.dev/three@0.136.0/examples/jsm/controls/OrbitControls.js';
- export function init( data ) { /* eslint-disable-line no-unused-vars */
- const { canvas, inputElement } = data;
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
- const fov = 75;
- const aspect = 2; // the canvas default
- const near = 0.1;
- const far = 100;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.z = 4;
- const controls = new OrbitControls( camera, inputElement );
- controls.target.set( 0, 0, 0 );
- controls.update();
- const scene = new THREE.Scene();
- {
- const color = 0xFFFFFF;
- const intensity = 1;
- 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 geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
- 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;
- return cube;
- }
- const cubes = [
- makeInstance( geometry, 0x44aa88, 0 ),
- makeInstance( geometry, 0x8844aa, - 2 ),
- makeInstance( geometry, 0xaa8844, 2 ),
- ];
- class PickHelper {
- constructor() {
- this.raycaster = new THREE.Raycaster();
- this.pickedObject = null;
- this.pickedObjectSavedColor = 0;
- }
- pick( normalizedPosition, scene, camera, time ) {
- // restore the color if there is a picked object
- if ( this.pickedObject ) {
- this.pickedObject.material.emissive.setHex( this.pickedObjectSavedColor );
- 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;
- // save its color
- this.pickedObjectSavedColor = this.pickedObject.material.emissive.getHex();
- // set its emissive color to flashing red/yellow
- this.pickedObject.material.emissive.setHex( ( time * 8 ) % 2 > 1 ? 0xFFFF00 : 0xFF0000 );
- }
- }
- }
- const pickPosition = { x: - 2, y: - 2 };
- const pickHelper = new PickHelper();
- clearPickPosition();
- function resizeRendererToDisplaySize( renderer ) {
- const canvas = renderer.domElement;
- const width = inputElement.clientWidth;
- const height = inputElement.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 ) ) {
- camera.aspect = inputElement.clientWidth / inputElement.clientHeight;
- camera.updateProjectionMatrix();
- }
- cubes.forEach( ( cube, ndx ) => {
- const speed = 1 + ndx * .1;
- const rot = time * speed;
- cube.rotation.x = rot;
- cube.rotation.y = rot;
- } );
- pickHelper.pick( pickPosition, scene, camera, time );
- renderer.render( scene, camera );
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- function getCanvasRelativePosition( event ) {
- const rect = inputElement.getBoundingClientRect();
- return {
- x: event.clientX - rect.left,
- y: event.clientY - rect.top,
- };
- }
- function setPickPosition( event ) {
- const pos = getCanvasRelativePosition( event );
- pickPosition.x = ( pos.x / inputElement.clientWidth ) * 2 - 1;
- pickPosition.y = ( pos.y / inputElement.clientHeight ) * - 2 + 1; // note we flip Y
- }
- function clearPickPosition() {
- // unlike the mouse which always has a position
- // if the user stops touching the screen we want
- // to stop picking. For now we just pick a value
- // unlikely to pick something
- pickPosition.x = - 100000;
- pickPosition.y = - 100000;
- }
- inputElement.addEventListener( 'mousemove', setPickPosition );
- inputElement.addEventListener( 'mouseout', clearPickPosition );
- inputElement.addEventListener( 'mouseleave', clearPickPosition );
- inputElement.addEventListener( 'touchstart', ( event ) => {
- // prevent the window from scrolling
- event.preventDefault();
- setPickPosition( event.touches[ 0 ] );
- }, { passive: false } );
- inputElement.addEventListener( 'touchmove', ( event ) => {
- setPickPosition( event.touches[ 0 ] );
- } );
- inputElement.addEventListener( 'touchend', clearPickPosition );
- }
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