VR 全景视频 · VR Video · ▶ 在线运行案例

VR 全景视频

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 VR 全景视频 效果:基于 WebGL 实现「VR 全景视频」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

  • 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

  1. 搭建 Scene、PerspectiveCamera、WebGLRenderer,挂载 canvas 并处理 resize
  2. 创建 OrbitControls(及 Raycaster 等交互控件,若源码包含)
  3. 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'

const box = document.getElementById('box')

const scene = new THREE.Scene()

const camera = new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 100000)

camera.position.set(2, 2, 2)

const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })

renderer.setPixelRatio(window.devicePixelRatio * 1.5)

renderer.setSize(box.clientWidth, box.clientHeight)

box.appendChild(renderer.domElement)

const controls = new OrbitControls(camera, renderer.domElement)
controls.enableDamping = true

const video = document.createElement('video')
video.crossOrigin = 'anonymous'
video.src = FILE_HOST + 'video/vr.mp4'
video.loop = true
video.muted = true
video.play()

const texture = new THREE.VideoTexture(video)
const geometry = new THREE.SphereGeometry(100, 64, 32)

const material = new THREE.MeshBasicMaterial({
    map: texture,
    side: THREE.DoubleSide,
})

const mesh = new THREE.Mesh(geometry, material)
scene.add(mesh)

animate()

function animate() {

    controls.update()

    mesh.rotation.y += 0.001

    requestAnimationFrame(animate)

    renderer.render(scene, camera)

}

window.onresize = () => {

    renderer.setSize(box.clientWidth, box.clientHeight)

    camera.aspect = box.clientWidth / box.clientHeight

    camera.updateProjectionMatrix()

}

完整源码:GitHub

小结