[0]如何操作人物模型的某个节点？

人物模型加载进来之后，我想传入坐标，来达到人的脚跟着坐标动起来，但是测试代码如下，设置坐标，模型的脚的坐标没有变化 
Laya.Scene3D.load("res/girl/layaScene.ls",Laya.Handler.create(this,function(scene){        
          Laya.stage.addChild(scene);   
          this.Girl = scene.getChildByName("girl-ceshi")  as Laya.SkinnedMeshSprite3D ;
  let bip: Laya.SkinnedMeshSprite3D = this.Girl.getChildByName("Bip001") as Laya.SkinnedMeshSprite3D;
  let Pelvis:Laya.Sprite3D = bip.getChildByName("Bip001 Pelvis") as Laya.Sprite3D;
      
  let Spine:Laya.SkinnedMeshSprite3D = Pelvis.getChildByName("Bip001 Spine") as Laya.SkinnedMeshSprite3D;
  let LThigh:Laya.SkinnedMeshSprite3D = Spine.getChildByName("Bip001 L Thigh") as Laya.SkinnedMeshSprite3D;     
  let LCalf:Laya.SkinnedMeshSprite3D = LThigh.getChildByName("Bip001 L Calf") as Laya.SkinnedMeshSprite3D;
  let LFoot:Laya.SkinnedMeshSprite3D = LCalf.getChildByName("Bip001 L Foot") as Laya.SkinnedMeshSprite3D;  
  let p:Laya.Vector3 = LCalf.transform.position;
          LCalf.transform.position = new Laya.Vector3(p.x+0.1,p.y+0.1,p.z);//为啥设置坐标没有任何效果
 
  }