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Three.js 精灵火花教程

news 2026/6/29 14:22:35

精灵火花 ·Tween Fire· ▶ 在线运行案例

案例合集：三维可视化功能案例（threehub.cn）
开源仓库github地址：https://github.com/z2586300277/three-cesium-examples
400个案例代码:网盘链接

你将学到什么

OrbitControls 相机轨道交互
Canvas 动态纹理贴图
GSAP 时间轴与补间动画
requestAnimationFrame渲染循环与resize自适应

效果说明

本案例演示精灵火花效果：用 Canvas 2D 绘制内容并实时映射为 Three.js 纹理；核心用到 OrbitControls、Canvas、GSAP。建议先打开文首在线案例查看动态画面，再对照下方源码逐步理解。

核心概念

OrbitControls轨道旋转缩放；开enableDamping时每帧需controls.update()。
属性插值动画，适合相机动效、UI 过渡。

实现步骤

搭建 Scene / Camera / Renderer 与 OrbitControls
rAF 循环中 update 并 render

代码要点

import * as THREE from 'three'import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js' import TWEEN from "three/addons/libs/tween.module.js"; import { GUI } from 'dat.gui'
// 获取容器并设置场景、相机和渲染器 const box = document.getElementById('box'); const scene = new THREE.Scene(); const camera = new THREE.PerspectiveCamera(50, box.clientWidth / box.clientHeight, 0.1, 1000); camera.position.set(0, 200, 200); const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true }); renderer.setSize(box.clientWidth, box.clientHeight); box.appendChild(renderer.domElement);
// 控制器 const controls = new OrbitControls(camera, renderer.domElement); controls.enableDamping = true;
// 动画循环 function animate() { requestAnimationFrame(animate); controls.update(); TWEEN.update(); renderer.render(scene, camera); } animate();
// 颜色配置 const colorArr = [ { position: 0, color: 'rgba(255,255,255,1)' }, { position: 0.05, color: 'rgba(255,230,140,0.9)' }, { position: 0.2, color: 'rgba(255,180,40,0.6)' }, { position: 1, color: 'rgba(255,100,0,0)' } ];
// 生成纹理 const canvas = document.createElement('canvas'); canvas.width = 256; canvas.height = 256; const context = canvas.getContext('2d'); context.clearRect(0, 0, canvas.width, canvas.height); const gradient = context.createRadialGradient( canvas.width / 2, canvas.height / 2, 0, canvas.width / 2, canvas.width / 2, canvas.width / 2 ); colorArr.forEach(stop => { gradient.addColorStop(stop.position, stop.color); }); context.fillStyle = gradient; context.beginPath(); context.arc(canvas.width / 2, canvas.height / 2, canvas.width / 2, 0, Math.PI * 2); context.fill();
// 内部高光 const innerGradient = context.createRadialGradient( canvas.width / 2, canvas.height / 2, 0, canvas.width / 2, canvas.height / 2, canvas.width / 4 );
innerGradient.addColorStop(0, 'rgba(255, 255, 255, 0.8)'); innerGradient.addColorStop(0.3, 'rgba(255, 240, 220, 0.5)'); innerGradient.addColorStop(1, 'rgba(255, 240, 200, 0)');
context.fillStyle = innerGradient; context.beginPath(); context.arc(canvas.width / 2, canvas.height / 2, canvas.width / 4, 0, Math.PI * 2); context.fill();
const texture = new THREE.CanvasTexture(canvas);
// 创建粒子系统 const sprites = new THREE.Object3D(); const material = new THREE.SpriteMaterial({ map: texture, blending: THREE.AdditiveBlending, transparent: true, depthWrite: false, alphaTest: 0.01 });
const gui = new GUI();
const config = { r_p: 20, size: 32, xx: 200, yy: 400, zz: 100, sl: 0.1, time: 1500, d: 4 }
gui.add(config, 'r_p', 0, 200).name('粒子范围'); gui.add(config, 'size', 0, 64).name('粒子大小'); gui.add(config, 'xx', 0, 800).name('x轴范围'); gui.add(config, 'yy', 0, 800).name('y轴范围'); gui.add(config, 'zz', 0, 800).name('z轴范围'); gui.add(config, 'sl', 0, 1).name('缩放比例'); gui.add(config, 'time', 0, 3000).name('动画时间'); gui.add(config, 'd', 0, 10).name('粒子间隔');
// 添加粒子 for (let i = 0; i < 300; i++) { const particle = new THREE.Sprite(material); initParticle(particle, i * config.d, sprites); sprites.add(particle); }
scene.add(sprites);
// 初始化粒子 function initParticle(particle, delay) {
const r_v = v => Math.random() * v - v / 2;
// 初始化位置和大小 particle.position.set(r_v(config.r_p), r_v(config.r_p), r_v(config.r_p)); particle.scale.x = particle.scale.y = particle.scale.z = Math.random() * config.size;
const xx = r_v(config.xx) const yy = Math.abs(r_v(config.yy)) const zz = -Math.cos((Math.PI / 10)xx)config.zz;
new TWEEN.Tween(particle.position) .delay(delay) .to({ x: xx, y: yy, z: zz }, config.time) .start() .onComplete(() => initParticle(particle, delay))
new TWEEN.Tween(particle.scale) .delay(delay) .to({ x: config.sl, y: config.sl }, config.time) .start();}