使用vue学习three.js之加载和使用纹理-用视频输出作为纹理，使用VideoTexture视频纹理实现物体表面播放视频

1.demo效果

2. 实现要点

2.1 使用标签引入视频资源

在public目录下的index.html文件中通过< script >标签引入相关文件文件

<video id="video" style="display: none; position: absolute; left: 15px; top: 75px;" :src="videoURL" controls="true" autoplay="true" />

data() {
     
  return {
     
    videoURL: `${
       process.env.BASE_URL}movies/Big_Buck_Bunny_small.ogv`,
    ...
  }
}

2.2 创建视频纹理材质

createMesh(geom) {
     
  const video = document.getElementById('video')//获取video标签元素
  const texture = new THREE.VideoTexture(video)//创建视频纹理

  const materialArray = []
  materialArray.push(new THREE.MeshBasicMaterial({
      color: 0x0051ba }))
  materialArray.push(new THREE.MeshBasicMaterial({
      color: 0x0051ba }))
  materialArray.push(new THREE.MeshBasicMaterial({
      color: 0x0051ba }))
  materialArray.push(new THREE.MeshBasicMaterial({
      color: 0x0051ba }))
  materialArray.push(new THREE.MeshBasicMaterial({
      map: texture })) //使用视频纹理创建材质
  materialArray.push(new THREE.MeshBasicMaterial({
      color: 0xff51ba }))
  const mesh = new THREE.Mesh(geom, materialArray)
  return mesh
}

3. demo代码

<template>
  <div>
    <video id="video" style="display: none; position: absolute; left: 15px; top: 75px;" :src="videoURL" controls="true" autoplay="true" />
    <div id="container" />
    <div class="controls-box">
      <section>
        <el-row>
          <el-checkbox v-model="properties.isRotate" @change="propertiesChange">
            isRotate
          </el-checkbox>
        </el-row>
        <el-row>
          <div v-for="(item,key) in properties" :key="key">
            <div v-if="item&&item.name!=undefined">
              <el-col :span="8">
                <span class="vertice-span">{
     {
      item.name }}</span>
              </el-col>
              <el-col :span="13">
                <el-slider v-model="item.value" :min="item.min" :max="item.max" :step="item.step" :format-tooltip="formatTooltip" @change="propertiesChange" />
              </el-col>
              <el-col :span="3">
                <span class="vertice-span">{
     {
      item.value }}</span>
              </el-col>
            </div>
          </div>
        </el-row>
      </section>
    </div>
  </div>
</template>

<script>
import * as THREE from 'three'
import {
      OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'
export default {
     
  data() {
     
    return {
     
      videoURL: `${
       process.env.BASE_URL}movies/Big_Buck_Bunny_small.ogv`,
      properties: {
     
        isRotate: false
      },
      cube: null,
      camera: null,
      scene: null,
      renderer: null,
      controls: null
    }
  },
  mounted() {
     
    this.init()
  },
  methods: {
     
    formatTooltip(val) {
     
      return val
    },

    // 初始化
    init() {
     
      this.createScene() // 创建场景
      this.createModels() // 创建模型
      this.createLight() // 创建光源
      this.createCamera() // 创建相机
      this.createRender() // 创建渲染器
      this.createControls() // 创建控件对象
      this.render() // 渲染
    },
    // 创建场景
    createScene() {
     
      this.scene = new THREE.Scene()
    },
    // 创建模型
    createModels() {
     
      this.cube = this.createMesh(new THREE.BoxGeometry(22, 16, 0.6))
      this.cube.position.y = 2
      this.scene.add(this.cube)
    },
    createMesh(geom) {
     
      const video = document.getElementById('video') //获取video标签元素
      const texture = new THREE.VideoTexture(video) //创建视频纹理

      const materialArray = []
      materialArray.push(new THREE.MeshBasicMaterial({
      color: 0x0051ba }))
      materialArray.push(new THREE.MeshBasicMaterial({
      color: 0x0051ba }))
      materialArray.push(new THREE.MeshBasicMaterial({
      color: 0x0051ba }))
      materialArray.push(new THREE.MeshBasicMaterial({
      color: 0x0051ba }))
      materialArray.push(new THREE.MeshBasicMaterial({
      map: texture })) //使用视频纹理创建材质
      materialArray.push(new THREE.MeshBasicMaterial({
      color: 0xff51ba }))
      const mesh = new THREE.Mesh(geom, materialArray)
      return mesh
    },
    // 创建光源
    createLight() {
     
      // 环境光
      const ambientLight = new THREE.AmbientLight(0x242424, 0.1) // 创建环境光
      this.scene.add(ambientLight) // 将环境光添加到场景

      const spotLight = new THREE.SpotLight(0xffffff) // 创建聚光灯
      spotLight.position.set(0, 30, 30)
      spotLight.intensity = 1.2
      this.scene.add(spotLight)
    },
    // 创建相机
    createCamera() {
     
      const element = document.getElementById('container')
      const width = element.clientWidth // 窗口宽度
      const height = element.clientHeight // 窗口高度
      const k = width / height // 窗口宽高比
      // PerspectiveCamera( fov, aspect, near, far )
      this.camera = new THREE.PerspectiveCamera(45, k, 0.1, 1000)
      this.camera.position.set(0, 1, 28) // 设置相机位置

      this.camera.lookAt(new THREE.Vector3(0, 0, 0)) // 设置相机方向
      this.scene.add(this.camera)
    },
    // 创建渲染器
    createRender() {
     
      const element = document.getElementById('container')
      this.renderer = new THREE.WebGLRenderer({
      antialias: true, alpha: true })
      this.renderer.setSize(element.clientWidth, element.clientHeight) // 设置渲染区域尺寸
      // this.renderer.shadowMap.enabled = true // 显示阴影
      // this.renderer.shadowMap.type = THREE.PCFSoftShadowMap
      this.renderer.setClearColor(0xeeeeee, 1) // 设置背景颜色
      element.appendChild(this.renderer.domElement)
    },

    propertiesChange() {
     
      //
    },

    updateRotation() {
     
      if (this.properties.isRotate) {
     
        this.cube.rotation.x += -0.01
        this.cube.rotation.y += -0.01
        this.cube.rotation.z += -0.01
      }
    },

    render() {
     
      this.updateRotation()
      this.renderer.render(this.scene, this.camera)
      requestAnimationFrame(this.render)
    },
    // 创建控件对象
    createControls() {
     
      this.controls = new OrbitControls(this.camera, this.renderer.domElement)
    }
  }
}
</script>

<style>
#container {
     
  position: absolute;
  width: 100%;
  height: 100%;
}
.controls-box {
     
  position: absolute;
  right: 5px;
  top: 5px;
  width: 300px;
  padding: 10px;
  background-color: #fff;
  border: 1px solid #c3c3c3;
}
.label-col {
     
  padding: 8px 5px;
}

.vertice-span {
     
  line-height: 38px;
  padding: 0 2px 0 10px;
}
</style>