How to update Object3D Position with TubeGeometry

Questions
,
1

when I use Object3D(const tubeGroup= new Object3D())
TubeGeometry(const tubeGeometry = new TubeGeometry()).

I want update Object3D position.

now , I use box3 and Box3Helper，then use box.setFromObject(tubeGeometry ) and box.getCenter(p)

final tubeGroup.position.copy(p).

but I find tubeGroup will be offset.

  const tubeGroup = new Object3D()

  const path = [new Vector3(0, 0, 3), new Vector3(3, 0, 7), new Vector3(-4, 0, 7)]

  const points = new CatmullRomCurve3(path) // .getPoints(50)

  const mesh = new Mesh(
    new TubeGeometry(points, 64, 0.2, 24, false),
    new MeshBasicMaterial({
      side: DoubleSide,
      color: 0xff0000,
      transparent: true,
      opacity: 0.6,
    })
  )

  // mesh.position = new Vector3(0,0,0)

  tubeGroup.add(mesh)
  scene.add(tubeGroup)

 // tubeGroup.position = Vector3(0,0,0)

use box3 and box3Helper

 let box = new Box3()

  let box3Helper = new Box3Helper(box)

  box.setFromObject(tubeGroup)

  let p = new Vector3()
  box.getCenter(p)

  mesh.position.copy(p)

before

before

after
after

expect：

this tubeGroup position is the box3.getCenter() and geometry still in it’s original position.