UserInput.FindMouseTargetHit C# (CSharp) Метод

    private RaycastHit FindMouseTargetHit()
    {
        RTSObject targetRtsElement = null;

        // Cast a ray in the direction clicked by the user to detect the currently clicked element,
        // and if it is a RTS element, then save its reference
        GameObject camera = GameObject.FindGameObjectWithTag("MainCamera");
        Ray ray = camera.GetComponent<Camera>().ScreenPointToRay(Input.mousePosition);

        // First, cast a ray without considering the currently selected element
        // (add it temporally to the "ignore raycast" layer), so if the user clicked
        // on a unit that is occluded by the current element, it will be selected instead
        int origSelectedObjectLayer = 0;
        if (player.SelectedObject != null)
        {
            origSelectedObjectLayer = player.SelectedObject.gameObject.layer;
            player.SelectedObject.gameObject.layer = 2; // IgnoreRaycast layer
        }

        RaycastHit hit;
        if (Physics.Raycast(ray, out hit))
        {
            GameObject objectHit = hit.collider.gameObject;
            targetRtsElement = objectHit.GetComponent<RTSObject>();
        }

        if (player.SelectedObject != null)
        {
            player.SelectedObject.gameObject.layer = origSelectedObjectLayer; // Restore original layer
        }

        // If we didn't find a collision, repeat the raycast in order to test if the user
        // clicked again on the unit he had already selected
        if (targetRtsElement == null && Physics.Raycast(ray, out hit))
        {
            GameObject objectHit = hit.collider.gameObject;
            targetRtsElement = objectHit.GetComponent<RTSObject>();
        }

        return hit;
    }