本文主要是介绍CSS3DObject 分子公式demo 实现，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
CSS3DRenderer, CSS3DObject, CSS3DSprite API 使用方式详解
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<html><head><title>three.js css3d - molecules</title><meta charset="utf-8"><meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0"><link type="text/css" rel="stylesheet" href="main.css"><style>body {background-color: #050505;background: radial-gradient(ellipse at center, rgba(43,45,48,1) 0%,rgba(0,0,0,1) 100%);}.bond {width: 5px;height: 10px;background: #eee;display: block;}</style></head><body><div id="container"></div><div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> css3d - molecules</div><script type="importmap">{"imports": {"three": "../build/three.module.js","three/addons/": "./jsm/"}}</script><script type="module">import * as THREE from 'three';import { TrackballControls } from 'three/addons/controls/TrackballControls.js';import { PDBLoader } from 'three/addons/loaders/PDBLoader.js';import { CSS3DRenderer, CSS3DObject, CSS3DSprite } from 'three/addons/renderers/CSS3DRenderer.js';import { GUI } from 'three/addons/libs/lil-gui.module.min.js';let camera, scene, renderer;let controls;let root;const objects = [];const tmpVec1 = new THREE.Vector3();const tmpVec2 = new THREE.Vector3();const tmpVec3 = new THREE.Vector3();const tmpVec4 = new THREE.Vector3();const offset = new THREE.Vector3();const VIZ_TYPE = {'Atoms': 0,'Bonds': 1,'Atoms + Bonds': 2};const MOLECULES = {'Ethanol': 'ethanol.pdb','Aspirin': 'aspirin.pdb','Caffeine': 'caffeine.pdb','Nicotine': 'nicotine.pdb','LSD': 'lsd.pdb','Cocaine': 'cocaine.pdb','Cholesterol': 'cholesterol.pdb','Lycopene': 'lycopene.pdb','Glucose': 'glucose.pdb','Aluminium oxide': 'Al2O3.pdb','Cubane': 'cubane.pdb','Copper': 'cu.pdb','Fluorite': 'caf2.pdb','Salt': 'nacl.pdb','YBCO superconductor': 'ybco.pdb','Buckyball': 'buckyball.pdb',// 'Diamond': 'diamond.pdb','Graphite': 'graphite.pdb'};const params = {vizType: 2,molecule: 'caffeine.pdb'};const loader = new PDBLoader();const colorSpriteMap = {};const baseSprite = document.createElement( 'img' );init();animate();function init() {camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 5000 );camera.position.z = 1000;scene = new THREE.Scene();root = new THREE.Object3D();scene.add( root );//renderer = new CSS3DRenderer();renderer.setSize( window.innerWidth, window.innerHeight );document.getElementById( 'container' ).appendChild( renderer.domElement );//controls = new TrackballControls( camera, renderer.domElement );controls.rotateSpeed = 0.5;//baseSprite.onload = function () {loadMolecule( params.molecule );};baseSprite.src = 'textures/sprites/ball.png';//window.addEventListener( 'resize', onWindowResize );//const gui = new GUI();gui.add( params, 'vizType', VIZ_TYPE ).onChange( changeVizType );gui.add( params, 'molecule', MOLECULES ).onChange( loadMolecule );gui.open();}function changeVizType( value ) {if ( value === 0 ) showAtoms();else if ( value === 1 ) showBonds();else showAtomsBonds();}//function showAtoms() {for ( let i = 0; i < objects.length; i ++ ) {const object = objects[ i ];if ( object instanceof CSS3DSprite ) {object.element.style.display = '';object.visible = true;} else {object.element.style.display = 'none';object.visible = false;}}}function showBonds() {for ( let i = 0; i < objects.length; i ++ ) {const object = objects[ i ];if ( object instanceof CSS3DSprite ) {object.element.style.display = 'none';object.visible = false;} else {object.element.style.display = '';object.element.style.height = object.userData.bondLengthFull;object.visible = true;}}}function showAtomsBonds() {for ( let i = 0; i < objects.length; i ++ ) {const object = objects[ i ];object.element.style.display = '';object.visible = true;if ( ! ( object instanceof CSS3DSprite ) ) {object.element.style.height = object.userData.bondLengthShort;}}}//function colorify( ctx, width, height, color ) {const r = color.r, g = color.g, b = color.b;const imageData = ctx.getImageData( 0, 0, width, height );const data = imageData.data;for ( let i = 0, l = data.length; i < l; i += 4 ) {data[ i + 0 ] *= r;data[ i + 1 ] *= g;data[ i + 2 ] *= b;}ctx.putImageData( imageData, 0, 0 );}function imageToCanvas( image ) {const width = image.width;const height = image.height;const canvas = document.createElement( 'canvas' );canvas.width = width;canvas.height = height;const context = canvas.getContext( '2d' );context.drawImage( image, 0, 0, width, height );return canvas;}//function loadMolecule( model ) {const url = 'models/pdb/' + model;for ( let i = 0; i < objects.length; i ++ ) {const object = objects[ i ];object.parent.remove( object );}objects.length = 0;loader.load( url, function ( pdb ) {const geometryAtoms = pdb.geometryAtoms;const geometryBonds = pdb.geometryBonds;const json = pdb.json;geometryAtoms.computeBoundingBox();geometryAtoms.boundingBox.getCenter( offset ).negate();geometryAtoms.translate( offset.x, offset.y, offset.z );geometryBonds.translate( offset.x, offset.y, offset.z );const positionAtoms = geometryAtoms.getAttribute( 'position' );const colorAtoms = geometryAtoms.getAttribute( 'color' );const position = new THREE.Vector3();const color = new THREE.Color();for ( let i = 0; i < positionAtoms.count; i ++ ) {position.fromBufferAttribute( positionAtoms, i );color.fromBufferAttribute( colorAtoms, i );const atomJSON = json.atoms[ i ];const element = atomJSON[ 4 ];if ( ! colorSpriteMap[ element ] ) {const canvas = imageToCanvas( baseSprite );const context = canvas.getContext( '2d' );colorify( context, canvas.width, canvas.height, color );const dataUrl = canvas.toDataURL();colorSpriteMap[ element ] = dataUrl;}const colorSprite = colorSpriteMap[ element ];const atom = document.createElement( 'img' );atom.src = colorSprite;const object = new CSS3DSprite( atom );object.position.copy( position );object.position.multiplyScalar( 75 );object.matrixAutoUpdate = false;object.updateMatrix();root.add( object );objects.push( object );}const positionBonds = geometryBonds.getAttribute( 'position' );const start = new THREE.Vector3();const end = new THREE.Vector3();for ( let i = 0; i < positionBonds.count; i += 2 ) {start.fromBufferAttribute( positionBonds, i );end.fromBufferAttribute( positionBonds, i + 1 );start.multiplyScalar( 75 );end.multiplyScalar( 75 );tmpVec1.subVectors( end, start );const bondLength = tmpVec1.length() - 50;//let bond = document.createElement( 'div' );bond.className = 'bond';bond.style.height = bondLength + 'px';let object = new CSS3DObject( bond );object.position.copy( start );object.position.lerp( end, 0.5 );object.userData.bondLengthShort = bondLength + 'px';object.userData.bondLengthFull = ( bondLength + 55 ) + 'px';//const axis = tmpVec2.set( 0, 1, 0 ).cross( tmpVec1 );const radians = Math.acos( tmpVec3.set( 0, 1, 0 ).dot( tmpVec4.copy( tmpVec1 ).normalize() ) );const objMatrix = new THREE.Matrix4().makeRotationAxis( axis.normalize(), radians );object.matrix.copy( objMatrix );object.quaternion.setFromRotationMatrix( object.matrix );object.matrixAutoUpdate = false;object.updateMatrix();root.add( object );objects.push( object );//const joint = new THREE.Object3D();joint.position.copy( start );joint.position.lerp( end, 0.5 );joint.matrix.copy( objMatrix );joint.quaternion.setFromRotationMatrix( joint.matrix );joint.matrixAutoUpdate = false;joint.updateMatrix();bond = document.createElement( 'div' );bond.className = 'bond';bond.style.height = bondLength + 'px';object = new CSS3DObject( bond );object.rotation.y = Math.PI / 2;object.matrixAutoUpdate = false;object.updateMatrix();object.userData.bondLengthShort = bondLength + 'px';object.userData.bondLengthFull = ( bondLength + 55 ) + 'px';object.userData.joint = joint;joint.add( object );root.add( joint );objects.push( object );}//console.log( "CSS3DObjects:", objects.length );changeVizType( params.vizType );} );}//function onWindowResize() {camera.aspect = window.innerWidth / window.innerHeight;camera.updateProjectionMatrix();renderer.setSize( window.innerWidth, window.innerHeight );}function animate() {requestAnimationFrame( animate );controls.update();const time = Date.now() * 0.0004;root.rotation.x = time;root.rotation.y = time * 0.7;render();}function render() {renderer.render( scene, camera );}</script></body></html>本内容来源于小豆包，想要更多内容请跳转小豆包 》
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