Vector3.SmoothDamp() 没有完全移动游戏对象

Posted 2023-04-12

【中文标题】Vector3.SmoothDamp() 没有完全移动游戏对象

【英文标题】：Vector3.SmoothDamp() isn't moving the gameObject completely

【发布时间】：2022-01-15 23:06:33

【问题描述】：

当我将游戏对象拖到屏幕边框之外时，它会回到场景中心，但在游戏对象的中间越过边缘进入屏幕后它会立即停止移动。

此屏幕截图显示游戏对象在向场景中心移动时立即停止。

我的错误在哪里？如何让卡片完全移动到场景中心？

[SerializeField] private Canvas canvas;
Vector3 offset = Vector3.zero;

[SerializeField] private GameObject cardChoice;
private CanvasGroup cardChoiceCG;

private int resolutionX = Screen.width;
private int resolutionY = Screen.height;

[SerializeField] private float distanceToFadeIn;

[SerializeField] private float smoothTime = 0.25f;
private Vector3 velocity = Vector3.zero;


private void Start() 

    cardChoiceCG = cardChoice.GetComponent<CanvasGroup>();



private void Update() 

    Vector3 screenPosition = canvas.worldCamera.WorldToScreenPoint(this.transform.position);

    if (screenPosition.x > resolutionX || screenPosition.x < 0f || 
        screenPosition.y > resolutionY || screenPosition.y < 0f) 

        transform.position = Vector3.SmoothDamp(transform.position, canvas.transform.TransformPoint(Vector3.zero), ref velocity, smoothTime);
    

    cardChoiceCG.alpha = Math.Abs((1f / distanceToFadeIn) * (screenPosition.x - (resolutionX / 2)));


public void OnPointerDown(PointerEventData eventData) 

    RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas.transform as RectTransform, eventData.position, canvas.worldCamera, out Vector2 pos);
    offset = transform.position - canvas.transform.TransformPoint(pos);



public void OnDrag(PointerEventData eventData) 

    RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas.transform as RectTransform, eventData.position, canvas.worldCamera, out Vector2 movePos);
    transform.position = canvas.transform.TransformPoint(movePos) + offset;

【问题讨论】：

你可以在画布中添加一个空的游戏对象并将其用作 SmoothDump 函数中的目标，也许问题是画布本身。

【参考方案1】：

解决了！ transform.position = Vector3.SmoothDamp(transform.position, canvas.transform.TransformPoint(Vector3.zero), ref velocity, smoothTime); 在 if 语句中，所以它只在卡片的中心不在屏幕上时才有效。