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Question by angelcaf · Jul 19, 2013 at 06:55 PM · character controllerorientation

How can I detect when a first person controller player is facing an NPC character?

I am making an NPC character that reacts to an approaching first player controller. I am currently checking and using as input the distance between player and NPC, but in addition I would like to detect whether the player is also oriented towards the NPC (i.e. looking towards the NPC direction with the camera, but not necessarily fully oriented towards it). Any suggestion?

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Answer by robertbu · Jul 19, 2013 at 07:02 PM

Your code would help. But if I understand correctly the NPC code could have something like:

 var v3FromCamera = transform.position - Camera.main.transform.position;
 var angle = Vector3.Angle(v3FromCamera, Camera.main.transform.forward);
 if (angle < some_angle) {
     Debug.Log("Camera is facing NPC");
 }

Basically this says that if the forward vector of the camera is within a specified angle of the direct vector between the camera and the NPC, then the camera is considered facing the NPC.

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avatar image angelcaf · Jul 20, 2013 at 02:33 PM 0
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This worked perfectly, I have only used the absolute value for the angle:

 if ($$anonymous$$ath.Abs(angle) < some_angle)

Thanks

avatar image robertbu · Jul 20, 2013 at 03:43 PM 1
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You don't need the absolute value. Vector3.Angle() returns an unsigned angle.

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Answer by Josh1231 · Jul 19, 2013 at 06:58 PM

you may use raycast and detect if it hits the NPC character

http://docs.unity3d.com/Documentation/ScriptReference/Physics.Raycast.html

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Answer by jathoo · Jul 19, 2013 at 09:33 PM

use raycasthit and on hit , check for the NPC collider name

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