Cesium中如何改变实体的旋转中心

是的大佬，怎么实现的？救！

  let position = Cesium.Cartesian3.fromDegrees(104.07, 30, 90)
  let heading = Cesium.Math.toRadians(0.0)
  let pitch = Cesium.Math.toRadians(0.0)
  let roll = Cesium.Math.toRadians(0)
  let hpr = new Cesium.HeadingPitchRoll(heading, pitch, roll)
  let orientation = Cesium.Transforms.headingPitchRollQuaternion(position, hpr)

  let cylinder = viewer.entities.add({
    position: position,
    orientation: orientation,
    cylinder: {
      length: 180.0, 
      topRadius: 0.0, 
      bottomRadius: 90.0, 
      material: Cesium.Color.fromCssColorString(`rgba(255,0,0,1)`) 
    }
  })

  let roll1 = 0

  setInterval(() => {
    roll1 += 10
    roll = Cesium.Math.toRadians(roll1)
    hpr = new Cesium.HeadingPitchRoll(heading, pitch, roll)
    cylinder.orientation = new Cesium.CallbackProperty(function () {
      return Cesium.Transforms.headingPitchRollQuaternion(position, hpr)
    }, false)

    let offset = new Cesium.Cartesian3(
      0,
      90 * Math.sin(roll),
      90 - 90 * Math.cos(roll)
    )

    let enuTransform = Cesium.Transforms.eastNorthUpToFixedFrame(position)
    Cesium.Matrix4.multiplyByPointAsVector(enuTransform, offset, offset)

    cylinder.position = new Cesium.CallbackProperty(function () {
      return Cesium.Cartesian3.add(position, offset, new Cesium.Cartesian3())
    }, false)
  }, 500)

@TuringP 感谢！！！