three自定义动画

/*
      模型从一个位置移动到另一个位置的动画
      mesh:为控制的mesh或者object3d
      name:为mesh或object3d的名字
      initX,initY,initZ:为mesh或object3d初始化的x,y,z;
      x, y, z:为mesh或object3d移动后的位置的x,y,z;
    */
    modelAnimation(mesh, name, initX, initY, initZ, x, y, z,) {
      var times = [0, 20];
      var values = [ initX, initY, initZ, x, y, z];
      var posTrack = new THREE.KeyframeTrack(name, times, values);
      var clip = new THREE.AnimationClip("default", 2, [posTrack]);
      this.mixer = new THREE.AnimationMixer(mesh);
      var AnimationAction = this.mixer.clipAction(clip);
      AnimationAction.timeScale = 5;
      AnimationAction.loop = THREE.LoopOnce; 
      AnimationAction.clampWhenFinished=true;
      AnimationAction.time = 0;
      clip.duration = 1;
      AnimationAction.play();
    }

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