Unity 如何获取鼠标停留位置下的物体

Unity 如何获取鼠标停留位置下的物体

根据UGUI的射线检测机制获取当前鼠标下的UI:

/// <summary>
    /// 获取鼠标停留处UI
    /// </summary>
    /// <param name="canvas"></param>
    /// <returns></returns>
    public GameObject GetOverUI(GameObject canvas)
    {
        PointerEventData pointerEventData = new PointerEventData(EventSystem.current);
        pointerEventData.position = Input.mousePosition;
        GraphicRaycaster gr = canvas.GetComponent<GraphicRaycaster>();
        List<RaycastResult> results = new List<RaycastResult>();
        gr.Raycast(pointerEventData, results);
        if (results.Count != 0)
        {
            return results[0].gameObject;
        } 
        return null;
    }

其中,results为鼠标下UI的列表。

不仅适用于UGUI,可以在摄像机上添加PhysicsRaycaster组件,传参为摄像机,这样就可以获取3D物体。

/// <summary>
    /// 获取鼠标停留处物体
    /// </summary>
    /// <param name="raycaster"></param>
    /// <returns></returns>
    public GameObject GetOverGameObject(GameObject raycaster)
    {
        PointerEventData pointerEventData = new PointerEventData(EventSystem.current);
        pointerEventData.position = Input.mousePosition;
        PhysicsRaycaster pr = raycaster.GetComponen