Hi everybody,
I have code written that makes the enemy follow me based on my proximity to them. What I would like to do to enhance this, is make it so that the enemy would not respond to my presence if I am standing behind him. This would allow for more specialized animations and head shots etc.
I’m just curious what code allows for the AI to have no awareness of things behind the front of their face/back of the head.
Thank you
distanceToPlayer = player.position - transform.position;
angleToPlayer = Vector3.Angle(distanceToPlayer, transform.forward);
// 0 <= angleToPlayer <= 180
// angleToPlayer == 180 -> player directly behind
// angleToPlayer == 0 -> player directly in front
// angleToPlayer == 90 -> player either directly left or directly right (or directly above or below)
if ( angleToPlayer < myPeripheralVisionAngle ) DetectedPlayer();
It’s easy enough to test the angle between the player and the enemies facing using the “Dot Product” which is the cosine of an angle and is helpfully a number between +1 and -1.
So:
var dot = Vector3.Dot((player.transform.position - enemy.transform.position).normalized, enemy.transform.forward);
Obviously you can use other values (0.5 is 45 degrees etc).
This is a tough one. Normalize its position to the players position and if it is negative on the right-left/X axis then he is behind him. That is what I think, but I cant test it at the moment.
@Louis - ah @Dr_GeoFry was waiting for an answer for 2 days and then 2 came along at once :) Answers on UA are like buses...
– whydoidoit@whydoidoit thanks guys. Actually the situation I was looking for help in is how do I make the enemy unaware of me if I approach him from behind. Currently, the enemy becomes aware of me when I come within a certain distance of him. I want him to be completely unaware of me if I approach from behind.
– Dr_GeoFryRight so you can use either Louis's answer or mine. In Louis's you need to have the enemy be unaware when the angle is > 90 (or whatever) and in mine when the dot value is < 0 (or whatever) - just add that to your distance test.
– whydoidoitok, I'm sure that will work. Let me test it out.
– Dr_GeoFry@whydoidoit I added this code: var dot = Vector3.Dot((target.transform.position - enemy.transform.position).normalized, enemy.transform.forward); Instead of player, I substituted target, because the player is the target. This is a part of the enemy AI script. I get this error when I want to test: An instance of type 'UnityEngine.Component' is required to access non static member 'transform'.
– Dr_GeoFry