///<summary>單選取物件</summary>
void SelectObj()
{
Vector2 mousePosition = Input.mousePosition;
Ray ray = Camera.main.ScreenPointToRay(mousePosition);
RaycastHit hit;
//選擇物體
if (Physics.Raycast(ray, out hit, 10, SelectableLayers))
{
PickableObject item = hit.collider.GetComponent <PickableObject>();
if (item != null &&
hit.collider.GetComponent <NavMeshAgent>() != null)
{
if (!SelectingObjs.Exists(e => e == item))
{
SelectingObjs.Add(item);
item.GotChosen();
}
}
}
}