Three.js 地球扫描教程

地球扫描 ·Earth Scan· ▶ 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地球扫描效果基于 WebGL 实现「地球扫描」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 three/examples/jsm/libs/lil-gui.module.min.jsconst 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, 8, 8)const renderer new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })renderer.setSize(box.clientWidth, box.clientHeight)box.appendChild(renderer.domElement)const controls new OrbitControls(camera, renderer.domElement)controls.enableDamping truewindow.onresize () {renderer.setSize(box.clientWidth, box.clientHeight)camera.aspect box.clientWidth / box.clientHeightcamera.updateProjectionMatrix()}const earthGeometry new THREE.SphereGeometry(2.5, 32, 16)const earthMaterial new THREE.MeshBasicMaterial({ map: new THREE.TextureLoader().load(FILE_HOST threeExamples/shader/earth1.jpg) })const earth new THREE.Mesh(earthGeometry, earthMaterial)scene.add(earth)const geometry new THREE.SphereGeometry(3, 32, 16)const material new THREE.ShaderMaterial({uniforms: {iTime: { value: 0.0 },pointNum: { value: new THREE.Vector2(64, 32) },uColor: { value: new THREE.Color(#bbd9ec) }},transparent: true,vertexShader:varying vec2 vUv; void main(){ vUvuv; gl_Position projectionMatrixmodelViewMatrixvec4(position, 1.0); },fragmentShader:float PI acos(-1.0); uniform vec3 uColor; uniform vec2 pointNum; uniform float iTime; varying vec2 vUv; void main(){ vec2 uv vUv vec2(0.0, iTime); float current abs(sin(uv.y * PI) ); if(current 0.99) { currentcurrent*0.5; } float d distance(fract(uv * pointNum), vec2(0.5, 0.5)); if(d current*0.2 ) { discard; } else { gl_FragColor vec4(uColor,current); } }})const folder new GUI()folder.addColor(material.uniforms.uColor, value)folder.add(material.uniforms.pointNum.value, x, 1, 128).name(pointNumX)folder.add(material.uniforms.pointNum.value, y, 1, 128).name(pointNumY)const sphere new THREE.Mesh(geometry, material)scene.add(sphere)animate()function animate() {earth.rotation.y 0.002material.uniforms.iTime.value 0.002requestAnimationFrame(animate)controls.update()renderer.render(scene, camera)}完整源码GitHub小结本文提供地球扫描完整 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