错误示范：

一开始把移动的代码写到update里去了，发现物体老是掉(总之移动非常不流畅，体验感很差）

void Update()
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);


            if (Physics.Raycast(ray, out RaycastHit hit, Mathf.Infinity, LayerMask.GetMask("Interactables")))
            {
                if (Input.GetMouseButton(0))
                {
                    hit.transform.position=ScreenToWorldPos(Input.mousePosition);
                    
                }
            }

        }

public Vector3 ScreenToWorldPos(Vector3 screenPosition)
        {

            Vector3 targetScreenPos = Camera.main.WorldToScreenPoint(depthReference.position);
            float depth = targetScreenPos.z;
            screenPosition.z = depth;

            Vector3 worldPosition = Camera.main.ScreenToWorldPoint(screenPosition);


            return worldPosition;

        }

修改：

把移动的代码改到协程里更新就能流畅移动了

void Update()
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);


            if (Physics.Raycast(ray, out RaycastHit hit, Mathf.Infinity, LayerMask.GetMask("Interactables")))
            {
                if (Input.GetMouseButtonDown(0))
                {
                    
                    StartCoroutine(Move(hit.collider.transform));
                }
            }

        }
        IEnumerator Move(Transform hitobj)
        {
            while (true)
            {

            
                if (Input.GetMouseButton(0) )
                {
                    Vector3 targetPosition = ScreenToWorldPos(Input.mousePosition);

                 
                    hitobj.position = targetPosition;
                    
                }
                

                yield return null;
            }
        }

        public Vector3 ScreenToWorldPos(Vector3 screenPosition)
        {

            Vector3 targetScreenPos = Camera.main.WorldToScreenPoint(depthReference.position);
            float depth = targetScreenPos.z;
            screenPosition.z = depth;

            Vector3 worldPosition = Camera.main.ScreenToWorldPoint(screenPosition);


            return worldPosition;

        }

---

问了一下gpt大概是这个原理，说白了就是鼠标输入不是逐帧更新的，它一直在更新，update执行速度跟不上，协程的执行速度跟得上（但是我还是没明白为啥协程比update快，就算update重新启动，可是执行的代码都是一样的，要么就是因为update每次都要重新进行射线检测拖慢了速度吧）