threejs FBXLoader 加载动画

function createObject() {
  const loader = new THREE.FBXLoader();
  loader.load("Fish.fbx", function (object) {
    object.mixer = new THREE.AnimationMixer(object);
    mixers.push(object.mixer);

    const action = object.mixer.clipAction(object.animations[0]);
    action.play();

    // 侧面面对镜头
    object.rotation.y = Math.PI * 0.5;
    // 加入场景

    scene.add(object);
    // 载入obj后动画循环
    loop();
  });
}

// 动画循环
function loop() {
  requestAnimationFrame(loop);

  if (mixers.length > 0) {
    for (let i = 0; i < mixers.length; i++) {
      mixers[i].update(clock.getDelta());
    }
  }
  renderer.render(scene, camera);
}