The current mouse position in pixel coordinates. (Read Only).
Input.mousePosition is a Vector3 for compatibility with functions that have Vector3 arguments. The z component of the Vector3 is always 0.
The bottom-left of the screen or window is at (0, 0). The top-right of the screen or window is at (Screen.width, Screen.height).
Note: Input.mousePosition reports the position of the mouse even when it is not inside the Game View, such as when Cursor.lockState is set to CursorLockMode.None. When running in windowed mode with an unconfined cursor, position values smaller than 0 or greater than the screen dimensions (Screen.width,Screen.height) indicate that the mouse cursor is outside of the game window.
In the following example, the x and y coordinates of the mouse position are printed when the “Fire1” button is clicked.