Finding a gameobject child of a gameobject [SOLVED]

Scripting
1

I cannot see anywhere in the API a method for finding a game object child of a game object (not a component). I tried using FindByTag, but it then finds the same object in another instance of the parent’s gameobject.

More detail:

I have two objects, a player and an enemy. They both have a child gameobject tagged “Right_Hand”. If I do FindByTag on the enemy it is finding the Right_Hand of the player…

2

Transform.Find().

–Eric

3

OK another one for you…

GameObject - ScriptA
|
|— GameObject - ScriptB

How can ScriptB “access” information (properties) in ScriptA? I cannot use SendMessageUpwards as ScriptA is just a data object…

4

http://unity3d.com/support/documentation/ScriptReference/index.Accessing_Other_Game_Objects.html

http://unity3d.com/support/documentation/ScriptReference/index.Member_Variables_26_Global_Variables.html

5

haha not sure why you sent me the second link.

Anyway, basically I cannot get the transform.Find method to work. It simply will not find the “hand” on the creature…

6

Because you asked

and global variables, addressed in the second link, are one way of going about that.

Post a code snippet, and preferably a small unitypackage or project, and perhaps we can help.

7

Actually I asked how one script can access another in a specific situation. I could not get a script from a child object to access the script on a parent object.

I understand global variables, but they would not work in this case.

The other way around works fine, because you just call GetComponentInChildren, but there is no GetComponentInParent.

The second issue I encountered was that the Find method on my models transform, would not Find the “hand”. If I hard code the path using

transform.Find("Bip01/Spine/R_arm/R_Hand");

it works, but I thought you could also do :

transform.Find("R_Hand");

but apparently not…

8

I don’t have any more advice about your first question then, without knowing more about your hierarchy.

As for the other…

Component[] boneComponents;
int numberOfBones;
Transform[] bones;
Transform r_Hand;

void SkeletonHijinx()
{
	boneComponents = GetComponentsInChildren(typeof(Transform) );
	numberOfBones = boneComponents.Length;
	bones = new Transform[numberOfBones];
	for (int i = 0; i < numberOfBones; ++i)
	{
		bones[i] = boneComponents[i] as Transform;
		r_Hand = bones[i].Find("R_Hand");
		if (r_Hand)
		{
			// Whatever, man
		}
	}
}
9

Thanks - that is a better way of doing it that I was (using a recursive method to search the whole hierarchy down from the main game object).

As for my first issue:

Below I have the prefab - spell_casting_bolts - it has one script attached “SpellInformation”. Now I have a script in casting_right_nuke which you can see in the inspector. It has a script called Hand Right Casting Spell, which needs to access SpellInformation. But I cannot in that script get a reference to SpellInformation (like I could the other way with GetComponentInChildren(…) .

196929--7153--$image2_172.png
196929--7153--$image2_172.png695×432 58.1 KB

10

Is there some reason you can’t use

transform.parent.GetComponent(typeof(SpellInformation) )

:?:

Or, declare the variable

public SpellInformation spellInformation;

and assign it in the Inspector?

11

First one worked…thanks for all your help - appreciated.

12

In case others are following this thread:

A refined search for the bones worked for me:

        boneComponents = info.Source.GetComponentsInChildren(typeof(Transform));
        numberOfBones = boneComponents.Length;
        for (int i = 0; i < numberOfBones; ++i)
        {
            string boneName = boneComponents[i].name;
            if (boneName.Equals("Bip01 L Hand") || boneName.Equals("L_Hand"))
            {
                hand = (Transform)boneComponents[i];
            }
        }