模型拆解动画 ·Model Unpack· ▶ 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
- glTF/Draco 模型加载与优化
- GSAP 时间轴与补间动画
requestAnimationFrame渲染循环与resize自适应
效果说明
本案例演示模型拆解动画效果:基于 WebGL 实现「模型拆解动画」可视化效果,附完整可运行源码;核心用到 OrbitControls、glTF/Draco、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
- Scene / Camera / WebGLRenderer构成最小渲染闭环;大场景可开
logarithmicDepthBuffer缓解 Z-fighting。 - OrbitControls提供轨道旋转/缩放;开启
enableDamping后需在 animate 中controls.update()。 - 阅读下方完整源码时,建议从
init/load/animate三条主线入手,再深入 shader 与工具函数。
实现步骤
- 搭建 Scene、PerspectiveCamera、WebGLRenderer,挂载 canvas 并处理
resize - 异步加载模型 / 3D Tiles / GeoJSON 等资源并加入 scene 或 entities
- 创建 OrbitControls(及 Raycaster 等交互控件,若源码包含)
- 在定时器或 GSAP 时间轴中更新 uniform / 变换,驱动特效播放
- 在
requestAnimationFrame循环中更新状态并 render(Cesium 为viewer.render或自动渲染) 代码要点
import * as THREE from 'three'import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js' import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js' import { DRACOLoader } from 'three/examples/jsm/loaders/DRACOLoader.js' import * as dat from 'dat.gui' import gsap from 'gsap'
const box = document.getElementById('box')
const scene = new THREE.Scene()
const camera = new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 1000)
camera.position.set(5, 5, 5)
const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })
renderer.setSize(box.clientWidth, box.clientHeight)
box.appendChild(renderer.domElement)
new OrbitControls(camera, renderer.domElement)
window.onresize = () => {
renderer.setSize(box.clientWidth, box.clientHeight)
camera.aspect = box.clientWidth / box.clientHeight
camera.updateProjectionMatrix()
}
animate()
function animate() {
requestAnimationFrame(animate)
renderer.render(scene, camera)
}
scene.add(new THREE.AmbientLight(0xffffff, 1))
const pointLight = new THREE.PointLight(0xffffff, 1.5, 0, 2)
pointLight.position.set(5, 5, 5)
scene.add(pointLight)
const directionalLight = new THREE.DirectionalLight(0xffffff, 2)
directionalLight.position.set(-5, 5, -5)
scene.add(directionalLight)
scene.add(new THREE.AxesHelper(1000))
let group
// 加载模型 gltf/ glb draco解码器 const loader = new GLTFLoader()
loader.setDRACOLoader(new DRACOLoader().setDecoderPath(FILE_HOST + 'js/three/draco/'))
loader.load(
HOST + '/files/model/car.glb',
gltf => {
group = gltf.scene
const box = new THREE.Box3().setFromObject(group);
const center = new THREE.Vector3();
box.getCenter(center);
group.center = center
group.traverse((child) => {
if (child.isMesh) {
child.localToWorld(child.position) //转为世界坐标
child.startPoisition = child.position.clone()
}
})
scene.add(group)
}
)
// 拆解 const mergeHandle = (model) => {
const distance = () => Math.random() > 0.5 ? 1.5 : -1.5
model.traverse((child) => {
if (child.startPoisition) {
const v1 = distance()
const v2 = distance()
const v3 = distance()
gsap.to(child.position, { x: child.startPoisition.x + v1, y: child.startPoisition.y + v2, z: child.startPoisition.z + v3, duration: 1, ease: 'power2.inOut' })
}
}); };
const gui = new dat.GUI()
gui.add({
'拆解动画': () => {
mergeHandle(group) }
}, '拆解动画')
gui.add({
'还原动画': () => {
group.traverse((child) => {
if (child.startPoisition) {
gsap.to(child.position, { x: child.startPoisition.x, y: child.startPoisition.y, z: child.startPoisition.z, duration: 1, ease: 'power2.inOut' })
}
});
}
}, '还原动画')完整源码:GitHub
小结
- 本文提供模型拆解动画完整 Three.js 源码与在线 Demo,建议先运行案例再改 uniform/参数做二次实验
- 更多 Three.js 实战案例见 three-cesium-examples 合集 与 GitHub 开源仓库