Find Child Objects by Name

Questions & Answers
1

I have a game object, and it has two children objects inside it. When the player collides with a trigger on the parent object I want the two children objects to move in a certain way. The script is attached to the parent. I was thinking it could find the children by name. Lets call them Child_1 and Child_2 and the parent object will be called ParentObj

Im just not sure how to go about finding the children.

I have laid out the basics. I just need a way to find the actual child and plug it into my little place holders.

using UnityEngine;
using System.Collections;

public class StandardDoor : MonoBehaviour {

	private Vector3 pos;
	public Vector3 target;
	
	void Start() {
		pos1 =  Child_2 GOES HERE .transform.position;
		pos1.y += 0;	
		
		target1 = Child_2 GOES HERE .transform.position;
		target1.y += 3;	
		
		pos2 =  Child_2 GOES HERE .transform.position;
		pos2.y += 0;	
		
		target2 = Child_2 GOES HERE .transform.position;
		target2.y -= 3;	
	}
	
	void OnTriggerEnter (Collider other) {
		if (other.tag == "Player") {
			Debug.Log("collide");
			
			Child_1 GOES HERE .transform.position = Vector3.MoveTowards(target, pos, 0.1f);
			Child_2 GOES HERE .transform.position = Vector3.MoveTowards(target, pos, 0.1f);

		}
	}
	
	void OnTriggerExit (Collider other) {
		if (other.tag == "Player") {
			Debug.Log("not collide");
			Child_1 GOES HERE .transform.position = Vector3.MoveTowards(pos, target, 0.1f)
			Child_2 GOES HERE .transform.position = Vector3.MoveTowards(pos, target, 0.1f)

		}
	}
}

thanks in advance.

3

Children are stored on the transform of the parent object. So iterating through the transform you can check for the name:

foreach (Transform t in transform)
{
    if(t.name == "Child1")// Do something to child one
    else if (t.name == "Child2")// Do something to child two
}

other way if you have a lot of children to find then you can create a dictionary of children:

Dictionary<string, Transform> dict = new Dictionary<string, Transform>();
void Start(){
    foreach(Transform t in transform)
    {
        dict.Add(t.name, t);
    }
}

then you can fetch it by name:

void OnCollisionEnter(Collision col){
    Transform child = dict[col.gameObject.name];
}

Actually this one is faster than the other way since it will find the matching one at O(1) while the other one is O(n) where n is the amount of children.

2

Transform.Find() is what you want. Refer: Transform.Find