Get Transform

Archived Forums Questions & Answers
1

I have a prefab with script attached to the root.

the preafab has a lot of children as you ca see in picture below.

How ca i get a child tronsform in the script attached to the root ? For example of the “gun” child which is one of the far way child from the root ?

In c# i know how to do it but i have no idea how to do it in javascript.

[70242-безымянныи.png|70242]

transform.root Will give you the Uber-Parent object in any tree. Anywhere in your screenshotted hierarchy, transform.root would be soldier3rdPerson.

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For me the issue was that none-visible elements, for example TextMeshPro text objects occupying the same area blocked it even though they were suppose to be behind and not target of raycasts. The problem was still only visible on mostly Samsung devices which made it a lot stranger. I made moved/resized/disabled any interfering elements. Not sure if it is related to your problem except that it seems to affects the same device families. :S

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4 Answers

4
2

I’ve had similar problem once, getting the right transforms and filtering them. I ended up writing my data structure class which mimics transform hierarchy. From that point i had methods to filter or find whatever i want.

3

I made this extension method. May be slow, but if it’s only called in awake that shouldn’t be much of a problem.

public static Transform GetChild(this Transform transform, string name)
	{
		Transform[] arr = transform.gameObject.GetComponentsInChildren<Transform> ();
		foreach(Transform t in arr)
		{
			if(t.gameObject.name == name)
			{
				return t;
			}
		}
		return null;

	}

Edit: Whoops! Didn’t notice you wanted JS. Hopefully this will help somebody else.

Edit2: Nevermind, you can use extension methods in JavaScript if you put the C# file in a “Plugins” folder. Create a C# file with that extention method, create a folder call ‘Plugins’, and place the file inside it. You can then reference it in your JavaScripts.

4

transform.root
Will give you the Uber-Parent object in any tree.

Anywhere in your screenshotted hierarchy, transform.root would be soldier3rdPerson.

From there you use the search methods on transform class to Find the children. (Which is a common question)

5

First of all the Transform.Find method returns a transfrom, so calling .transform after Find is pointless. You could simply do Find("xxx").Find("yyy");

However The Find method allows you to specify a “path” as well:

Transform gun = transform.Find("soldierCharacter/Bip01/Bip01 Pelvis/Bip01 Spine/Bip01 Spine1/Bip01 Spine2/Bip01 Neck/Bip01 R Clavicle/Bip01 R UpperArm/Bip01 R Forearm/Bip01 R Hand/gun");

While this is possible it’s usually not a good approach. It’s better to define a public variable in your root script and assign the gun transform in the inspector to that variable.

public Transform gun;

Another dynamical way is to “search” for a known Component. For example if you attach a component to your “gun” transform which is called “GunSlot” you can simply do

gun = GetComponentInChildren<GunSlot>().transform;

GetComponentInChildren will search for any component in any children.

Another way would be to use GetComponentsInChildren<Transform>() (note the Components) and iterate over all transforms to filter out the one you need. You could use a for loop or Linq:

using System.Linq;

gun = GetComponentsInChildren<Transform>().Where(t=>t.name).FirstOrDefault();