How to assign a parent based on the childs relative position.

Question

Hey,

I have a moving object (Capsule) and a stationary object (Ring). I am trying to get the ring to be the parent object of the capsule if the capsule is within 5 units of the ring. (For the sake of discussion we will say along the y axis, the ultimate goal is to have the ring become the parent when the capsule comes within a circle around the ring of radius 5)

Anyways, I have successfully parented the capsule absolutely via script. When attempting to add the position part I don't get any errors, but the capsule does not become parented.

I have attached a copy of my script below. I'm hoping someone can see an error in my code or provide an alternative route to explore?

var Capsule : Transform; var Ring : Transform; var xtemp; var ytemp;

function Start () { }

function Parent (ytemp : int){

ytemp = Capsule.transform.position.y; if (ytemp >= 0 && ytemp <= 5) Capsule.transform.parent = Ring.transform; }

function Update() {

}

Answer 1

Best Answer

Answer by Seth-Bergman · Nov 10, 2012 at 01:54 AM

Nice attempt.. Here's a better way:

 var capsule : Transform; 
 var ring : Transform;
 var parentingDistance : float = 5.0;
 
 function Start(){
 capsule = GameObject.Find("NameOfCapsule").GetComponent(Transform);  // swap in name of your object
 ring = GameObject.Find("NameOfRing").GetComponent(Transform);        // here too
 }
 
 function Update(){
 if(Vector3.Distance(ring.position,capsule.position) < parentingDistance && !capsule.parent)
 capsule.parent = ring;
 else if(Vector3.Distance(ring.position,capsule.position) > parentingDistance && capsule.parent)
 capsule.parent = null;
 }

Vector3.Distance makes this a breeze! I believe this should work for you

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smnerat · Nov 10, 2012 at 02:12 AM 0

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Executing this code gives me some errors, so I'm not sure if it works yet or not. On line 8 and 9 I get the error

"Cannot convert 'UnityEngine.GameObject' to 'UnityEngine.Transform'."

Seth-Bergman · Nov 10, 2012 at 02:47 AM 0

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OOPS, my bad, fixing it now..

It should work now

smnerat · Nov 10, 2012 at 03:05 AM 1

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Almost there, I added ".position" after ring and capsule in the Vector3.Distance() arguements. Everything works great now. I sincerely appreciate the help!

Seth-Bergman · Nov 10, 2012 at 03:12 AM 0

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Good call! I missed that too.. fixed it now, glad I could help!

How to assign a parent based on the childs relative position.

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