使用vue学习three.js之创建动画-使用外部模型创建动画，使用Blender导出的JSON模型创建动画

Posted 2021-06-08 点燃火柴

使用Blender导出的JSON模型创建动画

• 1.demo效果
• 2. 实现要点
• • 2.1 加载模型文件
  • 2.2 创建蒙皮与动画
  • 2.3 render中更新动画
• 3. demo代码

1.demo效果

2. 实现要点

2.1 加载模型文件

与之前一样这里要用到JSONLoader加载器，需要在 public目录下的index.html 文件中引入旧版three.js

<script type="text/javascript" src="./libs/three.js"></script>

在当前vue文件中注释掉引入本地依赖的代码

// import * as THREE from 'three'

加载模型代码如下

    // 创建模型
    createModels() {
      const THIS = this
      const publicPath = process.env.BASE_URL
      const loader = new THREE.JSONLoader()
      loader.load(`${publicPath}models/hand-2.js`, (model, material) => {
        //加载完成回调处理
        ...
      })
    }

2.2 创建蒙皮与动画

//创建蒙皮
const mat = new THREE.MeshLambertMaterial({
  color: 0xf0c8c9,
  skinning: true
})
THIS.mesh = new THREE.SkinnedMesh(model, mat)

//创建动画
const animation = new THREE.Animation(THIS.mesh, model.animation)

THIS.mesh.rotation.x = 0.5 * Math.PI
THIS.mesh.rotation.z = 0.7 * Math.PI

//创建模拟骨骼辅助对象
THIS.createBonesHelp()
THIS.scene.add(THIS.mesh)

animation.play() //动画开始

2.3 render中更新动画

render() {
  const delta = this.clock.getDelta() // 获取自上次调用的时间差

  if (this.mesh) {
    this.bonesHelper.visible = this.isShowBonesHelp
    this.bonesHelper.update()
    THREE.AnimationHandler.update(delta) // 更新动画
  }

  this.renderer.render(this.scene, this.camera)
  requestAnimationFrame(this.render)
}

3. demo代码

<template>
  <div>
    <div id="container" />
    <div class="controls-box">
      <section>
        <el-row>
          <el-checkbox v-model="isShowBonesHelp">
            showBonesHelp
          </el-checkbox>
        </el-row>
      </section>
    </div>
  </div>
</template>

<script>
// import * as THREE from 'three'

export default {
  data() {
    return {
      mesh: null,
      camera: null,
      scene: null,
      renderer: null,
      bonesHelper: null,
      clock: new THREE.Clock(),
      isShowBonesHelp: false
    }
  },
  mounted() {
    this.init()
  },
  methods: {
    // 初始化
    init() {
      this.createScene() // 创建场景
      this.createLight() // 创建光源
      this.createCamera() // 创建相机
      this.createRender() // 创建渲染器
      this.createModels() // 创建模型
      this.render() // 渲染
    },
    // 创建场景
    createScene() {
      this.scene = new THREE.Scene()
    },
    // 创建模型
    createModels() {
      const THIS = this
      const publicPath = process.env.BASE_URL
      const loader = new THREE.JSONLoader()
      loader.load(`${publicPath}models/hand-2.js`, (model, material) => {
        //创建蒙皮
        const mat = new THREE.MeshLambertMaterial({
          color: 0xf0c8c9,
          skinning: true
        })
        THIS.mesh = new THREE.SkinnedMesh(model, mat)

        //创建动画
        const animation = new THREE.Animation(THIS.mesh, model.animation)

        THIS.mesh.rotation.x = 0.5 * Math.PI
        THIS.mesh.rotation.z = 0.7 * Math.PI

        //创建模拟骨骼辅助对象
        THIS.createBonesHelp()
        THIS.scene.add(THIS.mesh)

        animation.play() //动画开始
      })
    },
    createBonesHelp() {
      this.bonesHelper = new THREE.SkeletonHelper(this.mesh)
      this.bonesHelper.material.linewidth = 2
      this.bonesHelper.visible = false
      this.scene.add(this.bonesHelper)
    },

    // 创建光源
    createLight() {
      const spotLight = new THREE.SpotLight(0xffffff) // 创建聚光灯
      spotLight.position.set(0, 50, 30)
      spotLight.intensity = 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, 0, 5) // 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.setClearColor(0x3f3f3f, 1) // 设置背景颜色
      element.appendChild(this.renderer.domElement)
    },

    render() {
      const delta = this.clock.getDelta() // 获取自上次调用的时间差

      if (this.mesh) {
        this.bonesHelper.visible = this.isShowBonesHelp
        this.bonesHelper.update()
        THREE.AnimationHandler.update(delta) // 更新动画
      }

      this.renderer.render(this.scene, this.camera)
      requestAnimationFrame(this.render)
    }
  }
}
</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;
}
</style>