Finding Children question

Question

To get a child to the current gameobject, is there a difference between transform.Find and transform.FindChild?

I'm also confused about how (or if) I can disable a GameObject using its Transform. I've written the below but get an error ( An instance of type 'UnityEngine.Transform' is required to access non static member 'Find'. ).

What's the correct (and most efficient) way to write this?:

 var barricade : Transform;
 
 function Start ()
 {
     // Cache it
     barricade = Transform.Find("Wall").FindChild("Barricade");
 }
 
 function Update ()
 {
     barricade.active = false;
 }

Answer 1

Best Answer

Answer by michael-bartnett · Sep 25, 2012 at 04:38 PM

To address the difference between the `transform.Find` and `transform.FindChild` instance methods, open UnityEngine.dll in MonoDevelop's Assembly Browser. Navigate to the Transform class, and look at the `FindChild` function, and you'll see it's just wrapping `Transform.Find`.

 using System;
 public Transform FindChild (string name)
 {
   return this.Find (name);
 }

So the answer is: use `Transform.Find`, because `Transform.FindChild` is just a wrapper for the former.

Add comment · Show 4 · Share

whydoidoit · Sep 25, 2012 at 04:54 PM 0

Share

The OP has marked the question as answered - so we must presume that @rutter provided the solution he was looking for.

As neither Find or FindChild are static methods the problem was trying to access them as such.

michael-bartnett · Sep 25, 2012 at 04:59 PM 0

Share

@whydoidoit I'm realizing my eyes glossed over the non-static function error portion of his question. But he still asked: "Is there a difference between transform.Find and transform.FindChild?" Which is a completely different question from "Why can't I cal Transform.FindChild("somechildname")?" I'll edit my answer to be less hostile.

whydoidoit · Sep 25, 2012 at 05:01 PM 0

Share

Yeah you are quite right, that is indeed what the first line says isn't it :)

Essential · Sep 26, 2012 at 03:47 AM 0

Share

Hey thanks Michael. You're right, I'd asked two questions in my post, so my bad on the confusion.

I actually believe my question was more related to the difference between transform.Find and FindChild so I'm updating it so yours is the appropriate answer — thanks for the input, I still hadn't figured out the difference between them! :)

Answer 2

Answer by rutter · May 14, 2012 at 09:21 PM

Transform and transform aren't quite the same thing:

Transform refers to the class
transform refers to the instance of that class which happens to be attached to the current GameObject

That's where your error is coming from.

A very similar difference applies between GameObject and gameObject.

The rest of your questions can probably be answered by close review of this script reference page, or by checking over the reference pages for the Transform and GameObject classes.

I'd sum up the difference like so:

GameObject.Find() looks for a match within in the entire scene.
transform.Find() looks for a match within the current transform's children.

So it's somewhat a question of how wide of a net you're looking to cast.

Add comment · Show 3 · Share

Essential · May 14, 2012 at 09:32 PM 0

Share

Ah, thanks.

So I write it as:

var barricade : GameObject;



function Start ()

{

    // Cache it

    barricade = transform.Find("Wall").Find("Barricade").gameObject;

}



function Update ()

{

    barricade.active = false;

}

Although I still don't understand the difference between transform.Find and transform.FindChild — Aren't they both searching children of the current transform?

rutter · May 14, 2012 at 10:27 PM 0

Share

I think you're correct on that point. I notice that the official script reference only mentions the one function, which might imply that the other one has been deprecated. I've seen that Unity has a few functions like that left about, which can be confusing.

amit-chai · Mar 11, 2015 at 04:13 PM 0

Share

TY, this is sound simple now, but i didn't encounter this kind of syntax ".gameObject"at the end... transform.Find("Wall").Find("Barricade").gameObject; Do u have more reference .gameObject? Anyway TY ;-)

Answer 3

Answer by whydoidoit · May 14, 2012 at 09:17 PM

You need to be using transform.Find (with a lowercase "t") that accesses the Transform of the current GameObject. You want to deactivate a GameObject using SetActiveRecursively if you want to do something that affects all of the children rather than trying to deactivate the transform. If you use transform.Find("myChild") then use .gameObject to get the item to activate/deactivate.

Add comment · Share

Finding Children question

3 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions