Three.js 光柱教程

光柱 ·Light Bar· ▶ 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
• requestAnimationFrame渲染循环与resize自适应

效果说明

本案例演示光柱效果：基于 WebGL 实现「光柱」可视化效果，附完整可运行源码；核心用到 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

• OrbitControls轨道旋转缩放；开enableDamping时每帧需controls.update()。

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'
  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(0, 10, 10)
  const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true, preserveDrawingBuffer: true })
  renderer.setSize(box.clientWidth, box.clientHeight)
  box.appendChild(renderer.domElement)
  new OrbitControls(camera, renderer.domElement)
  scene.add(new THREE.AmbientLight(0xffffff, 0.5), new THREE.AxesHelper(100))
  // 随机创建光柱 for (let i = 0; i < 10; i++) {
  const lightBar = createLightBar(0xffffff * Math.random())
  lightBar.position.set(Math.random()10 - 5, 0, Math.random()10 - 5)
  scene.add(lightBar)
  }
  animate()
  function animate() {
  requestAnimationFrame(animate)
  renderer.render(scene, camera)
  }
  window.onresize = () => {
  renderer.setSize(box.clientWidth, box.clientHeight)
  camera.aspect = box.clientWidth / box.clientHeight
  camera.updateProjectionMatrix()
  }
  function createLightBar(color = 0xfcde8c) { // 创建mesh const geometry = new THREE.CylinderGeometry(0.3, 0.3, 10, 6)
  const material = new THREE.MeshBasicMaterial({ color, transparent: true, opacity: 0.3, side: THREE.DoubleSide })
  const mesh = new THREE.Mesh(geometry, material)
  material.blending = THREE.AdditiveBlending
  // 创建纹理 const texture = new THREE.TextureLoader().load(FILE_HOST + 'images/channels/lightMap.png')
  texture.wrapS = THREE.RepeatWrapping
  texture.wrapT = THREE.RepeatWrapping
  // 创建平面 const plane = new THREE.PlaneGeometry(1.5, 10)
  const planeMaterial = new THREE.MeshBasicMaterial({ transparent: true, opacity: 0.3, side: THREE.DoubleSide, map: texture })
  planeMaterial.blending = THREE.AdditiveBlending
  planeMaterial.depthTest = false
  const planeMesh = new THREE.Mesh(plane, planeMaterial)
  const planeMesh2 = planeMesh.clone()
  planeMesh2.rotation.y = Math.PI / 3
  const planeMesh3 = planeMesh.clone()
  planeMesh3.rotation.y = -Math.PI / 3
  mesh.add(planeMesh3)
  mesh.add(planeMesh)
  mesh.add(planeMesh2)
  // 创建group const group = new THREE.Group()
  group.RootMaterials = [material, planeMaterial]
  group.add(mesh)
  return group
  }

  完整源码：GitHub

  小结

  • 本文提供光柱完整 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