unity中实现静态的3D对象对其他对象的跟随

using UnityEngine;

public class FollowPosition : MonoBehaviour
{
    public Transform targetTrans;  
    public Transform lookAtTrans;
    public Vector3 offsetPos;       //与本跟随者之间的位置偏移
    public bool x, y, z;            //是否在对应的轴上进行跟随

    Transform selfTrans;            
    Vector3 targetPos;
    Vector3 curPos;
    void Start()
    {
        selfTrans = transform;
    }
    void LateUpdate()
    {
        if(targetTrans != null)
        {
            targetPos = targetTrans.position;
            curPos = selfTrans.position;
            if (x)
                curPos.x = targetPos.x + offsetPos.x;
            if (y)
                curPos.y = targetPos.y + offsetPos.y;
            if (z)
                curPos.z = targetPos.z + offsetPos.z;
            selfTrans.position = curPos;
        }
        if(lookAtTrans != null)
        {
            selfTrans.LookAt(lookAtTrans.position);
        }
    }

}

测试的过程及效果如下:

这个时候，当cube的位置发生变化的时候sphere的即跟随运动: