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150 lines
3.2 KiB
JavaScript
150 lines
3.2 KiB
JavaScript
import * as THREE from 'https://cdn.skypack.dev/three@0.136.0/build/three.module.js';
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export const state = {
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width: 300, // canvas default
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height: 150, // canvas default
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};
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export const pickPosition = { x: 0, y: 0 };
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export function init( data ) { // eslint-disable-line no-unused-vars
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const { canvas } = data;
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const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
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state.width = canvas.width;
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state.height = canvas.height;
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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 = 100;
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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camera.position.z = 4;
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const scene = new THREE.Scene();
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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 geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
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function makeInstance( geometry, color, x ) {
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const material = new THREE.MeshPhongMaterial( {
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color,
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} );
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const cube = new THREE.Mesh( geometry, material );
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scene.add( cube );
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cube.position.x = x;
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return cube;
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}
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const cubes = [
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makeInstance( geometry, 0x44aa88, 0 ),
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makeInstance( geometry, 0x8844aa, - 2 ),
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makeInstance( geometry, 0xaa8844, 2 ),
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];
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class PickHelper {
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constructor() {
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this.raycaster = new THREE.Raycaster();
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this.pickedObject = null;
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this.pickedObjectSavedColor = 0;
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}
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pick( normalizedPosition, scene, camera, time ) {
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// restore the color if there is a picked object
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if ( this.pickedObject ) {
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this.pickedObject.material.emissive.setHex( this.pickedObjectSavedColor );
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this.pickedObject = undefined;
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}
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// cast a ray through the frustum
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this.raycaster.setFromCamera( normalizedPosition, camera );
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// get the list of objects the ray intersected
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const intersectedObjects = this.raycaster.intersectObjects( scene.children );
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if ( intersectedObjects.length ) {
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// pick the first object. It's the closest one
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this.pickedObject = intersectedObjects[ 0 ].object;
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// save its color
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this.pickedObjectSavedColor = this.pickedObject.material.emissive.getHex();
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// set its emissive color to flashing red/yellow
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this.pickedObject.material.emissive.setHex( ( time * 8 ) % 2 > 1 ? 0xFFFF00 : 0xFF0000 );
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}
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}
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}
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const pickHelper = new PickHelper();
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function resizeRendererToDisplaySize( renderer ) {
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const canvas = renderer.domElement;
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const width = state.width;
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const height = state.height;
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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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camera.aspect = state.width / state.height;
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camera.updateProjectionMatrix();
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}
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cubes.forEach( ( cube, ndx ) => {
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const speed = 1 + ndx * .1;
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const rot = time * speed;
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cube.rotation.x = rot;
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cube.rotation.y = rot;
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} );
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pickHelper.pick( pickPosition, scene, camera, time );
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renderer.render( scene, camera );
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requestAnimationFrame( render );
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}
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requestAnimationFrame( render );
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}
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