How can I convert an object array into a transform array?

Questions & Answers
1

I’m writing a piece of code that finds all objects on the field with a certain tag and puts it into to an object array.
After that, the array is put into a function I found that finds the object which is closest to object this script is attached to.

Only problem is that GameObject.FindGameObjectsWithTag (“TagName”); returns an object array, and the function i found only takes a transform array.
Is there anyway i can convert an object array into a transform array so that i can use this function?

This is what the code looks like right now:

using UnityEngine;
using System.Collections;

public class GetClosestCube : MonoBehaviour {

// Use this for initialization
public Object[] respawns;

void Start () {
	respawns = GameObject.FindGameObjectsWithTag ("Respawn");
	Debug.Log (respawns.Length);

}

// Update is called once per frame
void Update () {

	GetClosestEnemy (respawns);
}

Transform GetClosestEnemy(Transform[] enemies)
{
	Transform tMin = null;
	float minDist = Mathf.Infinity;
	Vector3 currentPos = transform.position;
	foreach (Transform t in enemies)
	{
		float dist = Vector3.Distance(t.position, currentPos);
		if (dist < minDist)
		{
			tMin = t;
			minDist = dist;
		}
	}
	return tMin;
}

}

3

Each GameObject has a transform associated with it, so we just need to collect them.

Basic array example:

GameObject[] gameObjects = GameObject.FindGameObjectsWithTag("SomeTag");
Transform[] transforms = new Transform[gameObjects.Length];
for (int i = 0; i < gameObjects.Length; i++) {
    transforms _= gameObjects*.transform;*_

}
Intermediate list example:
GameObject[] gameObjects = GameObject.FindGameObjectsWithTag(“SomeTag”);
List transforms = new List(gameObjects.Length);
foreach (GameObject go in gameObjects) {
transforms.Add(go);
}
Advanced LINQ example:
GameObject[] gameObjects = GameObject.FindGameObjectsWithTag(“SomeTag”);
List transforms = gameObjects.Select(go => go.transform).ToList();

2

Why can’t you just change the method signature to:

Transform GetClosestEnemy(GameObject[] enemies)

If you must keep the argument the way it is, here’s how you’d do it:

using UnityEngine; 
using System.Collections;

public class GetClosestCube : MonoBehaviour 
{

// Use this for initialization
public Transform[] respawns;
 
void Start () 
{
    GameObject[] respawnObjects = GameObject.FindGameObjectsWithTag ("Respawn");
    respawns = new Transform[respawnObjects.Length];

    for ( int i = 0; i < respawns.Length; ++i )
        respawns _= respawnObjects*.transform;*_

Debug.Log (respawns.Length);
}

// Update is called once per frame
void Update ()
{
GetClosestEnemy (respawns);
}

Transform GetClosestEnemy(Transform[] enemies)
{
Transform tMin = null;
float minDist = Mathf.Infinity;
Vector3 currentPos = transform.position;
foreach (Transform t in enemies)
{
float dist = Vector3.Distance(t.position, currentPos);
if (dist < minDist)
{
tMin = t;
minDist = dist;
}
}
return tMin;
}
}