How to find a Child Gameobject by name?

Question

Hi, how can i find a second c$$anonymous$$ld of a gameobject by name?

t$$anonymous$$s is the part of the code:

     function Update (){
 
     var ray : Ray = playerCamera.ViewportPointToRay (Vector3(0.5,0.5,0));
     var $$anonymous$$t : RaycastHit;
 
     if (Physics.Raycast (ray, $$anonymous$$t, distanceDetection)){
 
         if($$anonymous$$t.transform.name == "Bone"){
 
             target = true;
 
         } else {
 
             target = false;    
         }
 
     } else {
 
         target = false;
     }
 }

I need to find the c$$anonymous$$ld of a c$$anonymous$$ld gameobject named "Bone", but i cant find it t$$anonymous$$s way.

Answer 1

Best Answer

Answer by aldonaletto · Nov 06, 2011 at 11:25 PM

You can specify the path name to find a "grandc$$anonymous$$ld", like in the Transform.Find example:

   aFinger = transform.Find("LeftShoulder/Arm/Hand/Finger");

But if you have more than one c$$anonymous$$ld with the same name, you can iterate through all c$$anonymous$$ldren comparing the names or tags:

   for (var c$$anonymous$$ld in transform){
       if (c$$anonymous$$ld.name == "Bone"){
           // the code here is called 
           // for each c$$anonymous$$ld named Bone
       }
   }

In your code, you could also use the c$$anonymous$$ld found to search in its own c$$anonymous$$ldren:

    if ($$anonymous$$t.transform.name == "Bone"){
        target = true;
        var boneC$$anonymous$$ld = $$anonymous$$t.transform.Find("Bone");
        if (boneC$$anonymous$$ld){
            // bone c$$anonymous$$ld found
        }
    } else {
        ...

Add comment · Show 5 · Share

Edyvargas · Nov 07, 2011 at 12:11 AM 0

Share

I use the first method, Thank you very much aldonaletto!

All is the same, i only add one line to my code, and edit the name, this are the changes:

 bone = transform.Find("Crate/Crate [Layer1]/Bone"); //new line added, create a var name that holds the child object name.

 if (Physics.Raycast (ray, hit, distanceDetection)){

     if(hit.transform.name == bone){ //insted of use string name, use the variable with the name.

aldonaletto · Nov 07, 2011 at 12:30 AM 0

Share

The last line will not work, because bone is a Transform and hit.transform.name is a String. You can't compare Transform to String (transform.name), but you can compare Transforms:

 if (hit.transform == bone){

Edyvargas · Nov 07, 2011 at 12:53 AM 0

Share

You are right, its not a string, but works that way and dont with (hit.transform == bone) without the "name" at the end....i dont know why ¿?... UPDATE: the code isnt working properly, i must tune it some more..

aldonaletto · Nov 07, 2011 at 10:09 AM 0

Share

You could use:

   if (hit.transform.name == "Bone"){ // compare names

or

   if (hit.transform == bone){ // compare Transforms

Notice that you use the full path name to find some object deep in the hierarchy, but the transform.name property itself holds only the name - it's like files in the computer: the filename is always the same, no matter in which directory it is.
Another thing: maybe you're having problems because the object was not found due to some misspelled name or other reason; place a debug line after Find:

 bone = transform.Find(....);
 if (!bone) print("Bone not found");

Edyvargas · Nov 07, 2011 at 07:47 PM 0

Share

Ill try that and post the results later, thanks!.

Note: by the moment im using (hit.transform.tag == "Bone"), and put to the grandchild the tag name "Bone", that way the object its called always without any problem, but i want to do it without the need of create a new tag name if possible, post results later...

Answer 2

Answer by IMD · Jun 12, 2013 at 12:01 PM

Here's a little function I just cooked up that might come in handy..

  static public GameObject getC$$anonymous$$ldGameObject(GameObject fromGameObject, string withName) {
         //Author: Isaac Dart, June-13.
         Transform[] ts = fromGameObject.transform.GetComponentsInC$$anonymous$$ldren();
         foreach (Transform t in ts) if (t.gameObject.name == withName) return t.gameObject;
         return null;
     }

Add comment · Show 2 · Share

FamerJoe · Jan 15, 2014 at 01:38 PM 0

Share

You need to add the class type to this line for this to work:

Transform[] ts = fromGameObject.transform.GetComponentsInChildren();

Pawl · Jul 18, 2014 at 11:32 PM 2

Share

 Transform[] ts = fromGameObject.transform.GetComponentsInChildren<Transform>(true);

Answer 3

Answer by vladibo · Nov 16, 2018 at 02:24 AM

         internal static Transform FindC$$anonymous$$ldByRecursion(t$$anonymous$$s Transform aParent, string aName)
         {
             if (aParent == null) return null;
             var result = aParent.Find(aName);
             if (result != null)
                 return result;
             foreach (Transform c$$anonymous$$ld in aParent)
             {
                 result = c$$anonymous$$ld.FindC$$anonymous$$ldByRecursion(aName);
                 if (result != null)
                     return result;
             }
             return null;
         }

Add comment · Share

Answer 4

Answer by shawnblais · Aug 15, 2020 at 08:15 AM

Using Linq:

 var allKids = GetComponentsInC$$anonymous$$ldren<Transform>()
 var kid = allKids.Where(k => k.gameObject.name == name).FirstOrDefault();

Add comment · Show 1 · Share

sammx343 · May 29, 2021 at 05:14 AM 1

Share

I just changed it to:

var kid = allKids.First(k => k.name == name);

Answer 5

Answer by anthoxico · Nov 15, 2018 at 05:55 PM

 List<GameObject>  c$$anonymous$$ldrens = new List<GameObject>();
 int count = 0;

 w$$anonymous$$le (count < gameObject.transform.c$$anonymous$$ldCount)
 {
     c$$anonymous$$ldrens.Add(gameObject.transform.GetC$$anonymous$$ld(count).gameObject);
     count++;
 }

Add comment · Share

How to find a Child Gameobject by name?

7 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions