Three.js实现脸书元宇宙3D动态Logo效果

// ...
var controls = new function () {
  // 点的位置坐标
  this.deafultpoints = [
    [0, 0.4, -0.4],
    [0.4, 0, 0],
    [0.4, 0.8, 0.4],
    [0, 0.4, 0.4],
    [-0.4, 0, 0],
    [-0.4, 0.8, -0.4],
    [0, 0.4, -0.4]
  ]
  this.segments = 64;
  this.radius = 1;
  this.radiusSegments = 8;
  this.closed = true;
  this.points = [];
  this.newPoints = function () {
    var points = [];
    for (var i = 0; i < controls.deafultpoints.length; i++) {
      var _x = controls.deafultpoints[i][0] * 22;
      var _y = controls.deafultpoints[i][1] * 22;
      var _z = controls.deafultpoints[i][2] * 22;
      points.push(new THREE.Vector3(_x, _y, _z));
    }
    controls.points = points;
    controls.redraw();
  };
  this.redraw = function () {
    redrawGeometryAndUpdateUI(gui, scene, controls, function() {
      return generatePoints(controls.points, controls.segments, controls.radius, controls.radiusSegments,
        controls.closed);
    });
  };
};
controls.newPoints();
function generatePoints(points, segments, radius, radiusSegments, closed) {
  if (spGroup) scene.remove(spGroup);
  spGroup = new THREE.Object3D();
  var material = new THREE.MeshBasicMaterial({ color: 0xff0000, transparent: false });
  points.forEach(function (point) {
    var spGeom = new THREE.SphereGeometry(0.1);
    var spMesh = new THREE.Mesh(spGeom, material);
    spMesh.position.copy(point);
    spGroup.add(spMesh);
  });
  scene.add(spGroup);
  return new THREE.TubeGeometry(new THREE.CatmullRomCurve3(points), segments, radius, radiusSegments, closed);
}
// ...

<script src="./assets/libs/three.js"></script>
<script src="./assets/libs/loaders/FBXLoader.js"></script>
<script src="./assets/libs/inflate.min.js"></script>
<script src="./assets/libs/OrbitControls.js"></script>
<script src="./assets/libs/stats.js"></script>

var container, stats, controls, compose, camera, scene, renderer, light, clickableObjects = [], mixer, mixerArr = [], manMixer;
var clock = new THREE.Clock();
init();
animate();
function init() {
  container = document.createElement('div');
  document.body.appendChild(container);
  // 场景
  scene = new THREE.Scene();
  scene.transparent = true;
  scene.fog = new THREE.Fog(0xa0a0a0, 200, 1000);
  // 透视相机：视场、长宽比、近面、远面
  camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 1000);
  camera.position.set(0, 4, 16);
  camera.lookAt(new THREE.Vector3(0, 0, 0));
  // 半球光源：创建室外效果更加自然的光源
  light = new THREE.HemisphereLight(0xefefef);
  light.position.set(0, 20, 0);
  scene.add(light);
  // 平行光
  light = new THREE.DirectionalLight(0x2d2d2d);
  light.position.set(0, 20, 10);
  light.castShadow = true;
  scene.add(light);
  // 环境光
  var ambientLight = new THREE.AmbientLight(0xffffff, .5);
  scene.add(ambientLight);
  // 网格
  var grid = new THREE.GridHelper(100, 100, 0xffffff, 0xffffff);
  grid.position.set(0, -10, 0);
  grid.material.opacity = 0.3;
  grid.material.transparent = true;
  scene.add(grid);
  renderer = new THREE.webGLRenderer({ antialias: true, alpha: true });
  renderer.setPixelRatio(window.devicePixelRatio);
  renderer.outputEncoding = THREE.sRGBEncoding;
  renderer.setSize(window.innerWidth, window.innerHeight);
  // 背景色设置为透明
  renderer.setClearAlpha(0);
  // 开启阴影
  renderer.shadowMap.enabled = true;
  container.appendChild(renderer.domElement);
  // 添加镜头控制器
  controls = new THREE.OrbitControls(camera, renderer.domElement);
  controls.target.set(0, 0, 0);
  controls.update();
  window.addEventListener('resize', onWindowResize, false);
  // 初始化性能插件
  stats = new Stats();
  container.appendChild(stats.dom);
}
// 屏幕缩放
function onWindowResize() {
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(window.innerWidth, window.innerHeight);
}

var loader = new THREE.FBXLoader();
loader.load('assets/models/meta.fbx', function (mesh) {
  mesh.traverse(function (child) {
    if (child.isMesh) {
      child.castShadow = true;
      child.receiveShadow = true;
    }
  });
  mesh.rotation.y = Math.PI / 2;
  mesh.position.set(0, 1, 0);
  mesh.scale.set(0.05, 0.05, 0.05);
  scene.add(mesh);
});

var texLoader = new THREE.TextureLoader();
loader.load('assets/models/meta.fbx', function (mesh) {
  mesh.traverse(function (child) {
    if (child.isMesh) {
      if (child.name === '贝塞尔圆') {
        child.material = new THREE.MeshPhysicalMaterial({
          map: texLoader.load("./assets/images/metal.png"),
          metalness: .2,
          roughness: 0.1,
          exposure: 0.4
        });
      }
    }
  });
})

loader.load('assets/models/meta.fbx', function (mesh) {
  mesh.animations.map(item => {
    mesh.traverse(child => {
      // 因为模型中有多个物体，并且各自有不同动画，示例中只为贝塞尔圆这个网格添加动画
      if (child.name === '贝塞尔圆') {
        let mixer = new THREE.AnimationMixer(child);
        mixerArr.push(mixer);
        let animationClip = item;
        animationClip.duration = 8;
        let clipAction = mixer.clipAction(animationClip).play();
        animationClip = clipAction.getClip();
      }
    })
  })
});

function animate() {
  renderer.render(scene, camera);
  // 获得前后两次执行该方法的时间间隔
  let time = clock.getDelta();
  // 更新logo动画
  mixerArr.map(mixer => {
    mixer && mixer.update(time);
  });
  // 更新人物动画
  manMixer && manMixer.update(time);
  stats.update();
  requestAnimationFrame(animate);
}

<div class="loading" id="loading">
  <p class="text">加载进度<span id="progress">0%</span></p>
<div>

var loader = new THREE.FBXLoader();
loader.load('assets/models/meta.fbx', mesh => {
}, res => {
  // 加载进程
  let progress = (res.loaded / res.total * 100).toFixed(0);
  document.getElementById('progress').innerText = progress;
  if (progress === 100) {
    document.getElementById('loading').style.display = 'none';
  }
}, err => {
  // 加载失败
  console.log(err)
});

//声明raycaster和mouse变量
var raycaster = new THREE.Raycaster();
var mouse = new THREE.Vector2();
function onMouseClick(event) {
  // 通过鼠标点击的位置计算出raycaster所需要的点的位置，以屏幕中心为原点，值的范围为-1到1.
  mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
  mouse.y = - (event.clientY / window.innerHeight) * 2 + 1;
  // 通过鼠标点的位置和当前相机的矩阵计算出raycaster
  raycaster.setFromCamera(mouse, camera);
  // 获取raycaster直线和所有模型相交的数组集合
  let intersects = raycaster.intersectObjects(clickableObjects);
  if (intersects.length > 0) {
    console.log(intersects[0].object)
    let selectedObj = intersects[0].object;
    selectedObj.material = new THREE.MeshStandardMaterial({
      color: `#${Math.random().toString(16).slice(-6)}`,
      metalness: Math.random(),
      roughness: Math.random()
    })
  }
}
window.addEventListener('click', onMouseClick, false);

loader.load('assets/models/man.fbx', function (mesh) {
  mesh.traverse(function (child) {
    if (child.isMesh) {
      child.castShadow = true;
      child.receiveShadow = true;
    }
  });
  mesh.rotation.y = Math.PI / 2;
  mesh.position.set(-14, -8.4, -3);
  mesh.scale.set(0.085, 0.085, 0.085);
  scene.add(mesh);
  manMixer = new THREE.AnimationMixer(mesh);
  let animationClip = mesh.animations[0];
  let clipAction = manMixer.clipAction(animationClip).play();
  animationClip = clipAction.getClip();
}, res => {
  let progress = (res.loaded / res.total * 100).toFixed(0);
  document.getElementById('progress').innerText = progress + '%';
  if (Number(progress) === 100) {
    document.getElementById('loading').style.display = 'none';
  }
}, err => {
  console.log(err)
});