为什么我的Three.js动画在Vue.js中变慢了？

Question

我正在尝试在Vue.js中重新创建一个很棒的wave模拟：https://codepen.io/cheekymonkey/pen/vMvYNV。然而，当我在Vue.js中重新创建动画时，它真的很慢

我已经尝试使所有函数都与Vue.js方法相同，并将变量包含在组件的data属性中。

<template>
    <div id="container" style="width:100%; height:100vh;"></div>
</template>

<script>
import * as Three from 'three'
import SimplexNoise from'simplex-noise'

export default {
  name: 'ThreeTest',
  data() {
    return {
      camera: Three.PerspectiveCamera,
      scene: Three.Scene,
      renderer: Three.WebGLRenderer,
      mesh: Three.Mesh,
      noise: SimplexNoise,
      geometry: null,
      factor: 0
    }
  },
  methods: {
    init: function() {
      this.createScene();
      this.createCamera();
      this.createShape();
      this.addSpotlight('#fdffab');
      this.addAmbientLight();
      this.animate();
      window.addEventListener('resize', this.onResize())

    },
    onResize: function() {
      let container = document.getElementById('container');
      this.renderer.setSize(container.clientWidth, container.clientHeight);
      this.camera.aspect = container.clientWidth / container.clientHeight;
      this.camera.updateProjectionMatrix();
    },
    createScene: function() {
      this.scene = new Three.Scene();
      this.renderer = new Three.WebGLRenderer({
        antialias: true,
        alpha: true
      });
      let container = document.getElementById('container');
      this.renderer.setSize(container.clientWidth, container.clientHeight);
      this.renderer.setPixelRatio(window.devicePixelRatio);
      this.renderer.setClearColor(new Three.Color('#fff'));
      //this.render.shadowMap.type = Three.PCFSoftShadowMap;
      this.noise = new SimplexNoise()
      container.appendChild(this.renderer.domElement);
    },
    createCamera: function() {
      this.camera = new Three.PerspectiveCamera(20, container.clientWidth/container.clientHeight, 1, 1000);
      this.camera.position.set(0, 0, 20);
    },
    createShape: function() {
      const seg = 100
      this.geometry = new Three.PlaneGeometry(5, 8, seg, seg)
      const material = new Three.MeshPhysicalMaterial({
        color: '#da0463',
        metalness: 0.6,
        emissive: '#000',
        side: Three.DoubleSide,
        wireframe: true
      })
      this.mesh = new Three.Mesh(this.geometry, material)
      this.mesh.receiveShadow = true
      this.mesh.castShadow = true
      this.mesh.position.set(0, 0, 0)
      this.mesh.rotation.x = -Math.PI / 3
      this.mesh.rotation.z = -Math.PI / 4
      this.scene.add(this.mesh)
    },
    addSpotlight: function(color) {
      const light = new Three.SpotLight(color, 2, 1000)
      light.position.set(0, 0, 30)
      this.scene.add(light)
    },
    addAmbientLight: function() {
      const light = new Three.AmbientLight('#fff', 0.5)
      this.scene.add(light)
    },
    addjustVertices: function() {
      for (let i = 0; i < this.geometry.vertices.length; i++) {
        const vertex = this.geometry.vertices[i]
        const x = vertex.x / 4
        const y = vertex.y / 6
        vertex.z = this.noise.noise2D(x, y + this.factor)
      }
      this.factor += 0.007
      this.geometry.verticesNeedUpdate = true
      this.geometry.computeVertexNormals()
    },
    animate: function() {
        requestAnimationFrame(this.animate);
        this.addjustVertices();
        this.camera.updateProjectionMatrix();
        this.renderer.render(this.scene, this.camera);
    }
  },
  mounted() {
      this.init();
  }
}
</script>

它可以正常工作，就像在波浪动画中一样，但它的速度要慢得多。不确定这是由于Vue.js还是我是如何设置的。任何建议都非常感谢！

Answer 1

这是因为引擎盖下的Vue使附加到实例的每个组件具有响应性。Reactivity in Depth。打开dev工具并查看您的内存占用，当我在我的机器上运行您的代码片段时，它是~300mb，而不是codepen示例，它是~20mb。

当您使用console.log(this.scene)时，您看到的是允许Vue跟踪对象的getter/setter。

​

​

下面的代码片段将three.js对象从Vue data对象中拉出，并将它们附加到一个vue-static对象。此插件允许您将某些变量设置为非反应性。

<template>
    <div id="container" style="width:100%; height:100vh;"></div>
</template>

<script>
import * as Three from 'three'
import SimplexNoise from'simplex-noise'

export default {
  name: 'ThreeTest',
  static(){
    return {
      scene: new Three.Scene(),
      camera: null,
      renderer: Three.WebGLRenderer,
      mesh: new Three.Mesh,
      noise: SimplexNoise,
      factor:0
    }
  },
  mounted() {
    this.init();
  },
  methods: {
    init: function() {
      this.createScene();
      this.createCamera();
      this.createShape();
      this.addSpotlight('#fdffab');
      this.addAmbientLight();
      this.animate();
      window.addEventListener('resize', this.onResize())
    },
    onResize: function() {
      let container = document.getElementById('container');
      this.renderer.setSize(container.clientWidth, container.clientHeight);
      this.camera.aspect = container.clientWidth / container.clientHeight;
      this.camera.updateProjectionMatrix();
    },
    createScene: function() {

      console.log("TCL: this.$options.bigHairyHorseNuts ",this.bigHairyHorseNuts)

      this.renderer = new Three.WebGLRenderer({
        antialias: true,
        alpha: true
      });
      let container = document.getElementById('container');
      this.renderer.setSize(container.clientWidth, container.clientHeight);
      this.renderer.setPixelRatio(window.devicePixelRatio);
      this.renderer.setClearColor(new Three.Color('#fff'));
      //this.render.shadowMap.type = Three.PCFSoftShadowMap;
      this.noise = new SimplexNoise()
      container.appendChild(this.renderer.domElement);
    },
    createCamera: function() {
      this.camera = new Three.PerspectiveCamera(20, container.clientWidth/container.clientHeight, 1, 1000);
      this.camera.position.set(0, 0, 20);
    },
    createShape: function() {
      const seg = 100
      this.geometry = new Three.PlaneGeometry(5, 8, seg, seg)
      const material = new Three.MeshPhysicalMaterial({
        color: '#da0463',
        metalness: 0.6,
        emissive: '#000',
        side: Three.DoubleSide,
        wireframe: true
      })
      this.mesh = new Three.Mesh(this.geometry, material)
      this.mesh.receiveShadow = true
      this.mesh.castShadow = true
      this.mesh.position.set(0, 0, 0)
      this.mesh.rotation.x = -Math.PI / 3
      this.mesh.rotation.z = -Math.PI / 4
      this.scene.add(this.mesh)
    },
    addSpotlight: function(color) {
      const light = new Three.SpotLight(color, 2, 1000)
      light.position.set(0, 0, 30)
      this.scene.add(light)
    },
    addAmbientLight: function() {
      const light = new Three.AmbientLight('#fff', 0.5)
      this.scene.add(light)
    },
    addjustVertices: function() {
      for (let i = 0; i < this.geometry.vertices.length; i++) {
        const vertex = this.geometry.vertices[i]
        const x = vertex.x / 4
        const y = vertex.y / 6
        vertex.z = this.noise.noise2D(x, y + this.factor)
      }
      this.factor += 0.007
      this.geometry.verticesNeedUpdate = true
      this.geometry.computeVertexNormals()
    },
    animate: function() {
        requestAnimationFrame(this.animate);
        this.addjustVertices();
        this.camera.updateProjectionMatrix();
        this.renderer.render(this.scene, this.camera);
    }
  }
}
</script>