Collision with enemy = lose health

So yeah, I'm kinda having a problem with this. I have a player (First person controller) and and enemies that run at the player (Rigidbody and stuff). What I need is to remove a number from the global health var and throw the player backwards a little bit when an enemy hits the player. I've been trying onCollisionEnter and such but it doesn't work and I can't seem to specify that the player should only lose health then the ENEMY hits the PLAYER and nothing else. Any suggestions?

Also, I have pickups but right now they can be picked up by anything that collides with them which means the enemies keep giving me more ammo and such. How do I say exactly which objects CAN collide?

 

OnCollisionEnter() won't work if you put it in a script on the FPS Controller, because its not a rigidbody; but it will work if you put it in a script on the enemy. Just tag your FPS Controller "Player", and the put a script on the Enemy that says:

Code (csharp):

1.  
2. function OnCollisionEnter(collision : Collision){
3.     if(collision.CompareTag("Player")){
4.         //Reduce global health var
5.     }
6. }
7.  

 

Thanks for the speedy reply! I'll try that. Any idea how I would push the player in the enemys direction?

 

Hmm. I get an error. 'CompareTag' is not a member of 'UnityEngine.Collision'.

 

Sure, what I would do is convert the enemy's forward vector to world space, and then send that vector to the player so he can move in that direction. It'd be a little weird with a CharacterController because I don't know what happens when two move commands are happening at the same time, and instead of applying force you're going to have to move the player over a period of time (so we'll say, a knockback will move the player in the direction that the enemy sent him for 0.25 second at 15 units per second).

I think i would do something like this (not tested):

Code (csharp):

1.  
2. //this script goes on the enemies
3. function OnCollisionEnter(collision : Collision){
4.     if(collision.gameObject.CompareTag("Player")){
5.         //Reduce global health var here
6.         //now we'll knock the player back
7.         var myWorldForward : Vector3 = transform.TransformDirection(Vector3.forward); // convert my local forward to world space
8.         collision.gameObject.SendMessage("Knockback", myWorldForward);
9.     }
10. }
11.  

Code (csharp):

1.  
2. //this script goes on the player
3. public var speed : float = 15.0;
4. public var duration : float = 0.25;
5.  
6. private var controller : CharacterController;
7.  
8. function Start(){
9.     controller = GetComponent(CharacterController);
10. }
11.  
12. function Knockback(direction : Vector3){
13.     var startTime = Time.time;
14.     while(Time.time < (startTime + duration)){
15.         controller.SimpleMove(direction*speed);
16.         yield;
17.     }
18. }
19.  

 

hm... try collision.gameObject.CompareTag(). I updated my most recent response to reflect that.

 

Wow, thanks! It all works perfectly! I'll be sure to give you credit for your help

 

What do you guys mean by "//Reduce global health var here"???

 

Please don't necro bump a old thread. This thread is nearly 2 years old.

Make your own question if you have problems.

 

I did, but everyone send me this page!