喷泉水流 ·Water Flow· ▶ 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THREE.Points 粒子点渲染Canvas 动态纹理贴图BufferGeometry 自定义顶点/索引数据requestAnimationFrame渲染循环与resize自适应效果说明本案例演示喷泉水流效果用 Canvas 2D 绘制内容并实时映射为 Three.js 纹理核心用到 ShaderMaterial、OrbitControls、THREE.Points。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()。THREE.Points将每个顶点渲染为可控大小的粒子可用自定义 attribute如u_index驱动片元/顶点动画。CanvasTexture每帧或按需把 2D Canvas 内容上传 GPU适合动态文字、图表、视频帧贴图。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() scene.background new THREE.Color(0x1a1a2e)const camera new THREE.PerspectiveCamera(60, box.clientWidth / box.clientHeight, 0.1, 1000) camera.position.set(0, 5, 12)const renderer new THREE.WebGLRenderer({ antialias: true }) renderer.setSize(box.clientWidth, box.clientHeight) box.appendChild(renderer.domElement)new OrbitControls(camera, renderer.domElement) scene.add(new THREE.AmbientLight(0xffffff, 0.5))// 可配置参数 const config { count: 3000, nozzleX: 0, nozzleY: 6, velocityX: 1.5, velocityY: 2.0, spread: 1.5, gravity: 10, particleSize: 0.15, lifeTime: 2.0, }const uniforms { time: { value: 0 }, nozzlePos: { value: new THREE.Vector3(config.nozzleX, config.nozzleY, 0) }, velocity: { value: new THREE.Vector2(config.velocityX, config.velocityY) }, spread: { value: config.spread }, gravity: { value: config.gravity }, lifeTime: { value: config.lifeTime }, }const material new THREE.ShaderMaterial({ uniforms, vertexShader:attribute float size; attribute float phase; attribute vec3 randomVel; uniform float time; uniform vec3 nozzlePos; uniform vec2 velocity; uniform float spread; uniform float gravity; uniform float lifeTime; varying float vAlpha; void main() { // 粒子生命周期循环 float age mod(time phase, lifeTime); float ageRatio age / lifeTime; // 初始位置 随机偏移 vec3 pos nozzlePos; pos.x randomVel.x * 0.2; pos.y randomVel.y * 0.2; pos.z randomVel.z * 0.3; // 初始速度 随机扩散 vec3 vel vec3(velocity.x, velocity.y, 0.0); vel randomVel * spread; // 受重力的抛物运动 pos vel * age; pos.y - 0.5gravityage * age; // 透明度开始淡入结束淡出 vAlpha smoothstep(0.0, 0.05, ageRatio) * (1.0 - smoothstep(0.85, 1.0, ageRatio)); vec4 mvPosition modelViewMatrix * vec4(pos, 1.0); gl_Position projectionMatrix * mvPosition; gl_PointSize size * (250.0 / -mvPosition.z); }, fragmentShader:uniform sampler2D map; varying float vAlpha; void main() { vec4 texColor texture2D(map, gl_PointCoord); gl_FragColor vec4(texColor.rgb, texColor.a * vAlpha); }, transparent: true, depthWrite: false, blending: THREE.AdditiveBlending, })// 生成纹理 const c document.createElement(canvas) c.width c.height 32 const ctx c.getContext(2d) const g ctx.createRadialGradient(16, 16, 0, 16, 16, 16) g.addColorStop(0, rgba(200,235,255,1)) g.addColorStop(1, rgba(120,190,255,0)) ctx.fillStyle g ctx.fillRect(0, 0, 32, 32) uniforms.map { value: new THREE.CanvasTexture(c) }function buildGeometry() { const geo new THREE.BufferGeometry() const positions [], sizes [], phases [], randomVels [] for (let i 0; i config.count; i) { positions.push(0, 0, 0) sizes.push(config.particleSize(0.8 Math.random()0.4)) phases.push(Math.random() * config.lifeTime) // 错开生成时间 randomVels.push( (Math.random() - 0.5), (Math.random() - 0.5) * 0.6, (Math.random() - 0.5) * 0.8 ) } geo.setAttribute(position, new THREE.Float32BufferAttribute(positions, 3)) geo.setAttribute(size, new THREE.Float32BufferAttribute(sizes, 1)) geo.setAttribute(phase, new THREE.Float32BufferAttribute(phases, 1)) geo.setAttribute(randomVel, new THREE.Float32BufferAttribute(randomVels, 3)) return geo }const particles new THREE.Points(buildGeometry(), material) scene.add(particles)// GUI const gui new GUI() gui.add(config, nozzleX, -5, 5).name(喷嘴X).onChange(v uniforms.nozzlePos.value.x v) gui.add(config, nozzleY, 0, 10).name(喷嘴高度).onChange(v uniforms.nozzlePos.value.y v) gui.add(config, velocityX, -5, 5).name(水平速度).onChange(v uniforms.velocity.value.x v) gui.add(config, velocityY, 0, 5).name(上升速度).onChange(v uniforms.velocity.value.y v) gui.add(config, spread, 0, 3).name(扩散).onChange(v uniforms.spread.value v) gui.add(config, gravity, 0, 20).name(重力).onChange(v uniforms.gravity.value v) gui.add(config, lifeTime, 0.5, 5).name(生命周期).onChange(v uniforms.lifeTime.value v) gui.add(config, count, 500, 8000, 500).name(粒子数).onChange(() { particles.geometry.dispose() particles.geometry buildGeometry() }) gui.add(config, particleSize, 0.05, 0.5).name(粒子大小).onChange(() { particles.geometry.dispose() particles.geometry buildGeometry() })const clock new THREE.Clock()function animate() { requestAnimationFrame(animate) uniforms.time.value clock.getElapsedTime() 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小结本文提供喷泉水流完整 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