Misssile Tracking System

Questions & Answers
1

If I have a missile that I want to automatically lock onto a target, what is the best way to detect an enemy in front of it?

I have thought about creating a detection cone ( either as a mesh collider or something else ) or something using raycasting but am unsure what will work without slowing down the game too much,

Any help would be appreciated.

2

first you should find objects that potentially can be target

or

should helps

now just select one from them - this can be angle-to-forward check, distance check, other shields/armors that prevent homing missiles and so on

edit: FindClosestTransform.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class FindClosestTransform : MonoBehaviour
{
	void Update()
	{
		if (Input.GetKeyDown(KeyCode.F))
		{
			Transform deleting = GetClosestTransform(1000f);
			if (deleting)
			{
				Destroy(deleting.gameObject);
			}
		}
	}
	Transform GetClosestTransform(float radiusToSearch)
	{
		List colliders = new List(Physics.OverlapSphere(transform.position, radiusToSearch, -1));
		colliders.RemoveAll(x => x.transform == transform);
		if (colliders.Count == 0) { return null; }
		else
		{
			Transform answer = colliders[0].transform;
			for (int i = 1; i < colliders.Count; i++)
			{
				if ((answer.transform.position - transform.position).sqrMagnitude > (colliders*.transform.position - transform.position).sqrMagnitude)*
*				{*
_					answer = colliders*.transform;*_
_*				}*_
_*			}*_
_*			return answer;*_
_*		}*_
_*	}*_
_*}*_
_*
*_