Three.js 跳跃动画教程

跳跃动画 ·Jump Animate· ▶ 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-examples400个案例代码:网盘链接你将学到什么ShaderMaterial 自定义着色器实现核心视觉效果OrbitControls 相机轨道交互requestAnimationFrame渲染循环与resize自适应效果说明本案例演示跳跃动画效果基于 WebGL 实现「跳跃动画」可视化效果附完整可运行源码核心用到 ShaderMaterial、OrbitControls。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。ShaderMaterial通过uniforms 自定义 GLSL 控制逐像素/逐点效果透明粒子常配合depthTest: false。OrbitControls提供轨道旋转/缩放开启enableDamping后需在 animate 中controls.update()。实现步骤搭建 Scene、PerspectiveCamera、WebGLRenderer挂载 canvas 并处理resize定义 uniforms / onBeforeCompile 或 ShaderMaterial编写 GLSL 与材质参数创建 OrbitControls及 Raycaster 等交互控件若源码包含在requestAnimationFrame循环中更新状态并 renderCesium 为viewer.render或自动渲染代码要点import * as THREE from threeimport { OrbitControls } from three/examples/jsm/controls/OrbitControls.js import { GUI } from dat.guiconst box document.getElementById(box)const scene new THREE.Scene()const camera new THREE.PerspectiveCamera(50, box.clientWidth / box.clientHeight, 0.1, 2000)camera.position.set(10, 10, 10)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)scene.add(new THREE.GridHelper(10, 10))// uniforms const uniforms { points: { value: [ new THREE.Vector3(-30, 2.0, 0), new THREE.Vector3(0, 5.0, 0), new THREE.Vector3(30, 10.0, 0) ] }, // 目标点用于插值过渡 targetPoints: { value: [ new THREE.Vector3(-30, 2.0, 0), new THREE.Vector3(0, 5.0, 0), new THREE.Vector3(30, 10.0, 0) ] }, baseInfluenceRadius: { value: 5.0 }, heightToRadiusRatio: { value: 2.0 }, falloffPower: { value: 2.0 }, baseHeight: { value: 0.0 }, maxHeight: { value: 10.0 }, color1: { value: new THREE.Color(0x0066ff) }, color2: { value: new THREE.Color(0xff3300) }, }// 顶点着色器 const vertexShader uniform vec3 points[3]; uniform float baseInfluenceRadius; uniform float heightToRadiusRatio; uniform float falloffPower; uniform float baseHeight; uniform float maxHeight;varying float vHeightRatio;float calculateInfluence(vec3 point, vec3 vertex) { float distance2D length(point.xz - vertex.xz); float dynamicRadius baseInfluenceRadius point.y * heightToRadiusRatio; dynamicRadius max(dynamicRadius, baseInfluenceRadius); if (distance2D dynamicRadius) return 0.0; float normalizedDistance distance2D / dynamicRadius; float attenuation pow(1.0 - normalizedDistance, falloffPower); return attenuation * point.y; }void main() { vec4 worldPosition modelMatrix * vec4(position, 1.0); float heightOffset 0.0; heightOffset calculateInfluence(points[0], worldPosition.xyz); heightOffset calculateInfluence(points[1], worldPosition.xyz); heightOffset calculateInfluence(points[2], worldPosition.xyz); vHeightRatio clamp(heightOffset / maxHeight, 0.0, 1.0); vec3 newPosition position; newPosition.y heightOffset baseHeight; gl_Position projectionMatrixmodelViewMatrixvec4(newPosition, 1.0); }// 片段着色器 const fragmentShader uniform vec3 color1; uniform vec3 color2; varying float vHeightRatio;void main() { vec3 color mix(color1, color2, vHeightRatio); gl_FragColor vec4(color, 1.0); }// 创建网格 const geometry new THREE.BoxGeometry(200, 10, 1, 200, 1, 1).rotateX(-Math.PI / 2) const material new THREE.ShaderMaterial({ uniforms, vertexShader, fragmentShader, side: THREE.DoubleSide, wireframe: true }) scene.add(new THREE.Mesh(geometry, material))// GUI 参数 const params { baseInfluenceRadius: 5.0, heightToRadiusRatio: 2.0, falloffPower: 2.0, baseHeight: 0.0, maxHeight: 10.0, autoUpdate: true, interval: 1.0, wireframe: true, color1: #0066ff, color2: #ff3300, }// GUI 控制 const gui new GUI() gui.add(params, baseInfluenceRadius, 1, 50).name(影响半径).onChange(v uniforms.baseInfluenceRadius.value v) gui.add(params, heightToRadiusRatio, 0, 10).name(高度放大系数).onChange(v uniforms.heightToRadiusRatio.value v) gui.add(params, falloffPower, 0.1, 10).name(衰减指数).onChange(v uniforms.falloffPower.value v) gui.add(params, baseHeight, -5, 5).name(基础高度).onChange(v uniforms.baseHeight.value v) gui.add(params, maxHeight, 1, 30).name(最大高度).onChange(v uniforms.maxHeight.value v) gui.add(params, autoUpdate).name(自动更新) gui.add(params, interval, 0.3, 5).name(更新间隔(秒)) gui.add(params, wireframe).name(线框模式).onChange(v material.wireframe v) gui.addColor(params, color1).name(低点颜色).onChange(v uniforms.color1.value.set(v)) gui.addColor(params, color2).name(高点颜色).onChange(v uniforms.color2.value.set(v))// 随机生成目标点 function randomizeTargets() { for (let i 0; i 3; i) { uniforms.targetPoints.value[i].set( Math.random() * 200 - 100, Math.random() * params.maxHeight, 0 ) } }// 定时更新目标 let timer 0 const clock new THREE.Clock()function animate() { requestAnimationFrame(animate) const delta clock.getDelta()// 定时更新目标点 if (params.autoUpdate) { timer delta if (timer params.interval) { timer 0 randomizeTargets() } }// 平滑插值到目标点 for (let i 0; i 3; i) { uniforms.points.value[i].lerp(uniforms.targetPoints.value[i], delta * 3) }renderer.render(scene, camera) } animate()window.onresize () { renderer.setSize(box.clientWidth, box.clientHeight) camera.aspect box.clientWidth / box.clientHeight camera.updateProjectionMatrix() }完整源码GitHub小结本文提供跳跃动画完整 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