Identify an array index of a gameobject when clicked and interact with the selected gameobject(index) individually

[Tatsunomi]

I wanted to obtain the index of a gameobject when clicked and interact with the selected gameobject. I Instantiate a prefab using another script “myGUI” using the GUI button… When the GUI button is pressed and I click on the terrain… the prefab is then instantiated on the position of the input.mousePosition on the terrain. How do I find the index of a gameobject and interact with it individually when multiple prefabs of the same game object are instantiated.

Here’s a sample Code in an attempt to find the index:

    public class IndexSelect : MonoBehaviour {
    	//Array list for identifying indexes
    	static ArrayList MovePlayer = new ArrayList();
    	int i;
    	//End Array list
    
    	RaycastHit hit;
    	public Light myLight;
    	public bool Selected = false;
    
    
    
    		// Use this for initialization
    	void Start () {
    
    	
    	}
    	// Update is called once per frame
    	void Update () {
    	    Ray ray = camera.ScreenPointToRay(Input.mousePosition);
            //Debug.DrawRay(ray.origin, ray.direction * 100, Color.green);
    		
    		 if(Physics.Raycast(ray, out hit, 100))
    			{
    			print ("Here is an object!");
    			if (hit.transform.gameObject.tag == ("Ground")){
    				//Debug.DrawRay(ray.origin, ray.direction * 100, Color.red);
    				print ("Ray has Hit the Ground");
    			}
    			else if (hit.transform.gameObject.tag == ("Player")){
    				Debug.DrawRay(ray.origin, ray.direction * 100, Color.blue);
    				if ((Input.GetMouseButtonDown(0))&&(hit.transform.gameObject.tag == "Player")){
    					print("You Clicked the Player!");
    					GameObject[] light = GameObject.FindGameObjectsWithTag("Player");
    					myLight = light*.GetComponent<Light>();*

•  			myLight.enabled = true;*
  

•  			Selected = true;					*
  

•  		}*
  

•  	else*
  

•  	{*
  

•  	}*
  

• }*
  }

[clunk47]

Ok so let’s say you have 3 cubes in your scene. Each has the tag “Cube”. This will print the index of each cube when you click on it.

EDIT: If you want to call the specific gameObject, just use cubes[0], cubes[1], cubes[2] and so on.

using UnityEngine;
    using System.Collections;
    
    public class Example : MonoBehaviour 
    {
    	GameObject[] cubes;
    	Ray ray;
    	RaycastHit hit;
		string label = "Click on a cube to get the index of its gameObject in the array.";
    	
    	void Update()
    	{
    		cubes = GameObject.FindGameObjectsWithTag ("Cube");
    		ray = Camera.main.ScreenPointToRay(Input.mousePosition);
    		if(Physics.Raycast(ray, out hit) && Input.GetMouseButtonDown(0))
    		{
    			for(int i = 0; i < cubes.Length; i++)
    			{
    				if(hit.collider.gameObject == cubes*.gameObject)*

•  		{*
  

•  			label = "Your cube's index in the array is: " + i.ToString();	*
  

•  		}*
  

•  	}*
  

•  }*
  

• }*

•  void OnGUI()*
  

•  {*
  

•  	GUILayout.Label(label);*
  

•  }*
  

}

[rhys_vdw]

You don’t need to access the array. You can get a reference to the object directly by using:

hit.transform.gameObject;

So:

if (Input.GetMouseButtonDown(0) && hit.gameObject.tag == "Player"){
    print("You Clicked the Player!");
    myLight = hit.transform.gameObject.GetComponent<Light>();
    myLight.enabled = true;
    Selected = true;             
}

You don’t need your index variable at all.

Hope that all makes sense.

###Other notes:

you don’t need to store your RaycastHit outside of the Update function.

It’s preferable to use the generic List<> container than ArrayList. You can get this from System.Collections.Generic and would be used like this:

List<GameObject> gameObjects = new List<GameObject>();