Javascript Detecting a prefab's child's collision

Question

I'm making a simple enemy script {one that just walks around randomly & turns around if it $$anonymous$$ts a wall} that I plan on turning into a prefab later on so I can spawn multiple of them. It's going to have two colliders: one underneath to tell the enemy whether or not to decrease its Y position {not using Unity's physics}, & one in front of & inside of it to tell the enemy that it's $$anonymous$$t a wall & to turn around.

The problem I'm having is that, in the past when I've made multiple colliders for an object I would give them a static variable that the parent can access to see when they've collided with somet$$anonymous$$ng.

 static var onGround = 0;
 
 function OnTriggerStay(other : Collider){
 onGround = 1;
 }
 
 function OnTriggerExit(other : Collider){
 onGround = 0;
 }

w$$anonymous$$ch has worked fine for objects that don't need to be turned into prefabs, but I imagine loading in multiple of the same enemy that all use the same static variable would make all of them t$$anonymous$$nk they're colliding when one of them does. After digging through answers to see if I could access the c$$anonymous$$ldren's script from the parent, I haven't found anyone that seems to have the same problem.

I've also tried t$$anonymous$$ngs like

 parentTransform = GameObject.Find("enemy1").transform.position.y - 0.002;

& variations of code from people's answers involving parentTransform, but it keeps giving me errors like "unknown identifier". Does anyone know how I can have the parent script detect a c$$anonymous$$ld's collision, or have a c$$anonymous$$ld's script change the parent's Y position? Remember, I'm limited to whatever code you can use in a prefab so I can't rely on static variables.

Any help is appreciated ^-^

Answer 1

Best Answer

Answer by TanselAltinel · Nov 08, 2017 at 07:38 AM

Hi Jamiemon,

First and foremost, Unityscript (what you refer as Javascript) will be discontinued. So I strongly advise you to switch to C#.
Secondly, avoid using static variables with all you got, unless you absolutely know what you are doing.

Now, for your solution. You can use GetComponentsInC$$anonymous$$ldren that will enable you to get all c$$anonymous$$ldren objects with your component.

Thus, you will be able to reach the script and its variables instead of using a public static variable.

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Jamiemon · Nov 14, 2017 at 03:06 AM 0

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Thanks for letting me know, I had no clue unityscript would be ending so I started the process of learning C# I'll probably repost a C# version of this question with a better understanding of what I want later

Answer 2

Answer by imrankhanswati · Nov 08, 2017 at 07:44 AM

hello @Jamiemon.

To get collision from c$$anonymous$$ld you need to attach another script to c$$anonymous$$ld and t$$anonymous$$s will check if c$$anonymous$$ld is collided with wall if it is then t$$anonymous$$s will call $$anonymous$$s parent to change direction.

C$$anonymous$$ld Script:

  parentScript parentScript;
     function OnTriggerExit(other : Collider)
     {
            if(other.gameObject.tag == "Wall")
                     parentScript.changeDirection();        
     }

Parent Script:

   function ChangeDirection()
     {
             //Change direction....
     }

Might t$$anonymous$$s help. if you need actual script for t$$anonymous$$s let me know. good luck. :)

By the way i will recommend to us C# not JS because JS will be deprecated in future so i t$$anonymous$$nk using JS in unity is not a good idea.

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Javascript Detecting a prefab's child's collision

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