Player's last location as a Transform

Question

So I have my AI moving around my scene using a NavMesh.

If order for the AI to move around it needs a target that is a Transform.

Obviously the Player is the target, but I would like for the player to have the ability to disappear making the AI search in he players last known location.

I assume this can be done by having the AI raycast save the Vector3 of the gameobject with the tag "player" in a variable, then run a method that would have the AI "scan" in and around said area as my AI "sees" with raycasts.

If I'm right, awesome. I just cannot think of how to do it.

Currently I use these two methods to trick the AI in to stop persuit when it sees a certain tag (I also assume that this is not the best way to do this)

 public bool CanSeePlayer()
     {
         RaycastHit hit;
         Vector3 rayDirection = Player.transform.position - transform.position;
 
         if ((Vector3.Angle(rayDirection, transform.forward)) <= fieldOfViewDegrees * 1f)
         {
             // Detect if player is within the field of view
             if (Physics.Raycast(transform.position, rayDirection, out hit))
             {
                 return (hit.transform.CompareTag("Player"));
             }
         }
 
         return false;
     }
 
     public bool CanSeeObject()
     {
         RaycastHit hit;
         Vector3 rayDirection = Player.transform.position - transform.position;
 
         if ((Vector3.Angle(rayDirection, transform.forward)) <= fieldOfViewDegrees * 0.5f)
         {
             // Detect if player is within the field of view
             if (Physics.Raycast(transform.position, rayDirection, out hit))
             {
                 return (hit.transform.CompareTag("Object"));
             }
         }
 
         return false;
     }

So it's implemented as:

 //If tag check = Object, transition to search state
         if (npc.GetComponent<NPCTankController>().CanSeeObject())
         {
             npc.GetComponent<NPCTankController>().target = null;
             Debug.Log("Switch to Search State");
             npc.GetComponent<NPCTankController>().SetTransition(Transition.LostPlayer);
         }

And the opposite in other States:

 //If player seen, switch to chase.
         if (npc.GetComponent<NPCTankController>().CanSeePlayer())
         {
             npc.GetComponent<NPCTankController>().target = player;
             Debug.Log("Switch to Chase State");
             npc.GetComponent<NPCTankController>().SetTransition(Transition.SawPlayer);
         }

What I want is that if CanSeeObject()becomes true, that the AI would take the Vector3 of what CanSeePlayer() was and move on it's own in a certain area "scanning" with CanSeePlayer() from left to right until it sees the player, of course if Player is not found then I just want the AI to wander around randomly until CanSeePlayer() is true again.

Answer 1

Best Answer

Answer by siaran · May 09, 2015 at 11:42 AM

So, all you need to do is keep a Vector3 variable that stores the last place the player was seen then?

So you change the code that detects if the player can be seen a bit

   // Detect if player is within the field of view
   if (Physics.Raycast(transform.position, rayDirection, out hit))
    {
     if((hit.transform.CompareTag("Player")){
       lastPlayerSeen = hit.point;
       return true;
     }
     return false;
  }

That gives you the last seen player location. So then you need to add some code when it switches from true to false to do your scan (either for x amount of time or until it has completed a certain action) and then go back to its normal behaviour if it doesn't find the player (or start chasing the player again if it does).

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BMRX · May 10, 2015 at 10:48 PM 0

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Thanks Siaran, this does not work as fully intended but it does seem to work. When the AI detects an object as the hit.point ins$$anonymous$$d of player it seems to go back to "player last position" that said player last position is never what it actually was.

Player's last location as a Transform

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