UGUI--------UI以及3D物体显示在鼠标点击位置

1、鼠标的点击的位置—赋值给3D物体

 float distance=5;
    /// <summary>
    /// 赋值鼠标位置给3D物体
    /// </summary>
    void MouseTo3DPos()
    {
        Vector2 mousePosition = Input.mousePosition;
        Vector3 targetPosition = Camera.main.ScreenToWorldPoint(new Vector3(mousePosition.x, mousePosition.y, distance));
        cube.position = targetPosition;
    }

2、鼠标的点击位置—赋值给UI物体
2.1、当UI的Canvas的RenderMode为Screen Space–Overlay

  public Text m_text;
    void MouseToUI()
    {
        Vector3 mousePosition = Input.mousePosition;
        m_text.transform.position = mousePosition;
    }

2.2、当UI的Canvas的RenderMode为World Space，其中m_text.transform .parent为该Text所在Canvas.

 void MouseToUI()
    {
        Vector2 localPoint;
        RectTransformUtility.ScreenPointToLocalPointInRectangle(m_text.transform .parent .GetComponent <RectTransform >(), Input.mousePosition, Camera.main , out localPoint);
        m_text.transform.localPosition = localPoint;

    }