Getting all objects withing a collision, in order? Player behind wall should not be detected

Questions & Answers
1

I have a a player and a guard with walls. I have the guard that has a collision circle in front of it. I want that when the player is seen, Debug.Log(“I see you”), but if the wall is before the player (so the player is behind a wall) I don’t it to say anything.

right now I have: (which doesnt work if my player is behind a wall)

  void OnTriggerStay(Collider otherObject)
    {
        if (otherObject.tag == "Player")
        {
            Debug.Log("I see you");
        }
    }
2

Add in a quick linecast between the player and the guard-

if(Physics.Linecast(guard.position, player.position))
{
    // Behind a wall, can't see you
}

Or, I guess, more specifically-

if(Physics.Linecast(transform.position, otherObject.transform.position))
{
    // Can't see you, won't attack you
}

And then to check whether the guard is actually looking in your direction (probably do this first, before the linecast, because it's cheaper)

if(Vector3.Angle(guard.forward, player.position - guard.position) > 90)
{
    // Player is out of view
}